move gpui-components to ui crate

crates/ui/src/accordion.rs

@@ -0,0 +1,300 @@
+use std::{cell::Cell, rc::Rc, sync::Arc};
+
+use gpui::{
+    div, prelude::FluentBuilder as _, rems, AnyElement, Div, ElementId, InteractiveElement as _,
+    IntoElement, ParentElement, RenderOnce, SharedString, StatefulInteractiveElement as _, Styled,
+    WindowContext,
+};
+
+use crate::{h_flex, theme::ActiveTheme as _, v_flex, Icon, IconName, Sizable, Size};
+
+/// An AccordionGroup is a container for multiple Accordion elements.
+#[derive(IntoElement)]
+pub struct Accordion {
+    id: ElementId,
+    base: Div,
+    multiple: bool,
+    size: Size,
+    bordered: bool,
+    disabled: bool,
+    children: Vec<AccordionItem>,
+    on_toggle_click: Option<Arc<dyn Fn(&[usize], &mut WindowContext) + Send + Sync>>,
+}
+
+impl Accordion {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            id: id.into(),
+            base: v_flex().gap_1(),
+            multiple: false,
+            size: Size::default(),
+            bordered: true,
+            children: Vec::new(),
+            disabled: false,
+            on_toggle_click: None,
+        }
+    }
+
+    pub fn multiple(mut self, multiple: bool) -> Self {
+        self.multiple = multiple;
+        self
+    }
+
+    pub fn bordered(mut self, bordered: bool) -> Self {
+        self.bordered = bordered;
+        self
+    }
+
+    pub fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+
+    pub fn item<F>(mut self, child: F) -> Self
+    where
+        F: FnOnce(AccordionItem) -> AccordionItem,
+    {
+        let item = child(AccordionItem::new());
+        self.children.push(item);
+        self
+    }
+
+    /// Sets the on_toggle_click callback for the AccordionGroup.
+    ///
+    /// The first argument `Vec<usize>` is the indices of the open accordions.
+    pub fn on_toggle_click(
+        mut self,
+        on_toggle_click: impl Fn(&[usize], &mut WindowContext) + Send + Sync + 'static,
+    ) -> Self {
+        self.on_toggle_click = Some(Arc::new(on_toggle_click));
+        self
+    }
+}
+
+impl Sizable for Accordion {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+
+impl RenderOnce for Accordion {
+    fn render(self, _: &mut WindowContext) -> impl IntoElement {
+        let mut open_ixs: Vec<usize> = Vec::new();
+        let multiple = self.multiple;
+        let state = Rc::new(Cell::new(None));
+
+        self.children
+            .iter()
+            .enumerate()
+            .for_each(|(ix, accordion)| {
+                if accordion.open {
+                    open_ixs.push(ix);
+                }
+            });
+
+        self.base
+            .id(self.id)
+            .children(
+                self.children
+                    .into_iter()
+                    .enumerate()
+                    .map(|(ix, accordion)| {
+                        let state = Rc::clone(&state);
+                        accordion
+                            .with_size(self.size)
+                            .bordered(self.bordered)
+                            .when(self.disabled, |this| this.disabled(true))
+                            .on_toggle_click(move |_, _| {
+                                state.set(Some(ix));
+                            })
+                    }),
+            )
+            .when_some(
+                self.on_toggle_click.filter(|_| !self.disabled),
+                move |this, on_toggle_click| {
+                    this.on_click(move |_, cx| {
+                        let mut open_ixs = open_ixs.clone();
+                        if let Some(ix) = state.get() {
+                            if multiple {
+                                if let Some(pos) = open_ixs.iter().position(|&i| i == ix) {
+                                    open_ixs.remove(pos);
+                                } else {
+                                    open_ixs.push(ix);
+                                }
+                            } else {
+                                let was_open = open_ixs.iter().any(|&i| i == ix);
+                                open_ixs.clear();
+                                if !was_open {
+                                    open_ixs.push(ix);
+                                }
+                            }
+                        }
+
+                        on_toggle_click(&open_ixs, cx);
+                    })
+                },
+            )
+    }
+}
+
+/// An Accordion is a vertically stacked list of items, each of which can be expanded to reveal the content associated with it.
+#[derive(IntoElement)]
+pub struct AccordionItem {
+    icon: Option<Icon>,
+    title: AnyElement,
+    content: AnyElement,
+    open: bool,
+    size: Size,
+    bordered: bool,
+    disabled: bool,
+    on_toggle_click: Option<Arc<dyn Fn(&bool, &mut WindowContext)>>,
+}
+
+impl AccordionItem {
+    pub fn new() -> Self {
+        Self {
+            icon: None,
+            title: SharedString::default().into_any_element(),
+            content: SharedString::default().into_any_element(),
+            open: false,
+            disabled: false,
+            on_toggle_click: None,
+            size: Size::default(),
+            bordered: true,
+        }
+    }
+
+    pub fn icon(mut self, icon: impl Into<Icon>) -> Self {
+        self.icon = Some(icon.into());
+        self
+    }
+
+    pub fn title(mut self, title: impl IntoElement) -> Self {
+        self.title = title.into_any_element();
+        self
+    }
+
+    pub fn content(mut self, content: impl IntoElement) -> Self {
+        self.content = content.into_any_element();
+        self
+    }
+
+    pub fn bordered(mut self, bordered: bool) -> Self {
+        self.bordered = bordered;
+        self
+    }
+
+    pub fn open(mut self, open: bool) -> Self {
+        self.open = open;
+        self
+    }
+
+    pub fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+
+    fn on_toggle_click(
+        mut self,
+        on_toggle_click: impl Fn(&bool, &mut WindowContext) + 'static,
+    ) -> Self {
+        self.on_toggle_click = Some(Arc::new(on_toggle_click));
+        self
+    }
+}
+
+impl Sizable for AccordionItem {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+
+impl RenderOnce for AccordionItem {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let text_size = match self.size {
+            Size::XSmall => rems(0.875),
+            Size::Small => rems(0.875),
+            _ => rems(1.0),
+        };
+
+        v_flex()
+            .bg(cx.theme().accordion)
+            .overflow_hidden()
+            .when(self.bordered, |this| {
+                this.border_1().border_color(cx.theme().border).rounded_md()
+            })
+            .text_size(text_size)
+            .child(
+                h_flex()
+                    .id("accordion-title")
+                    .justify_between()
+                    .map(|this| match self.size {
+                        Size::XSmall => this.py_0().px_1p5(),
+                        Size::Small => this.py_0p5().px_2(),
+                        Size::Large => this.py_1p5().px_4(),
+                        _ => this.py_1().px_3(),
+                    })
+                    .when(self.open, |this| {
+                        this.when(self.bordered, |this| {
+                            this.bg(cx.theme().accordion_active)
+                                .text_color(cx.theme().foreground)
+                                .border_b_1()
+                                .border_color(cx.theme().border)
+                        })
+                    })
+                    .child(
+                        h_flex()
+                            .items_center()
+                            .map(|this| match self.size {
+                                Size::XSmall => this.gap_1(),
+                                Size::Small => this.gap_1(),
+                                _ => this.gap_2(),
+                            })
+                            .when_some(self.icon, |this, icon| {
+                                this.child(
+                                    icon.with_size(self.size)
+                                        .text_color(cx.theme().muted_foreground),
+                                )
+                            })
+                            .child(self.title),
+                    )
+                    .when(!self.disabled, |this| {
+                        this.cursor_pointer()
+                            .hover(|this| this.bg(cx.theme().accordion_hover))
+                            .child(
+                                Icon::new(if self.open {
+                                    IconName::ChevronUp
+                                } else {
+                                    IconName::ChevronDown
+                                })
+                                .xsmall()
+                                .text_color(cx.theme().muted_foreground),
+                            )
+                    })
+                    .when_some(
+                        self.on_toggle_click.filter(|_| !self.disabled),
+                        |this, on_toggle_click| {
+                            this.on_click({
+                                move |_, cx| {
+                                    on_toggle_click(&!self.open, cx);
+                                }
+                            })
+                        },
+                    ),
+            )
+            .when(self.open, |this| {
+                this.child(
+                    div()
+                        .map(|this| match self.size {
+                            Size::XSmall => this.p_1p5(),
+                            Size::Small => this.p_2(),
+                            Size::Large => this.p_4(),
+                            _ => this.p_3(),
+                        })
+                        .child(self.content),
+                )
+            })
+    }
+}

crates/ui/src/animation.rs

@@ -0,0 +1,19 @@
+/// A cubic bezier function like CSS `cubic-bezier`.
+///
+/// Builder:
+///
+/// https://cubic-bezier.com
+pub fn cubic_bezier(x1: f32, y1: f32, x2: f32, y2: f32) -> impl Fn(f32) -> f32 {
+    move |t: f32| {
+        let one_t = 1.0 - t;
+        let one_t2 = one_t * one_t;
+        let t2 = t * t;
+        let t3 = t2 * t;
+
+        // The Bezier curve function for x and y, where x0 = 0, y0 = 0, x3 = 1, y3 = 1
+        let _x = 3.0 * x1 * one_t2 * t + 3.0 * x2 * one_t * t2 + t3;
+        let y = 3.0 * y1 * one_t2 * t + 3.0 * y2 * one_t * t2 + t3;
+
+        y
+    }
+}

crates/ui/src/badge.rs

@@ -0,0 +1,123 @@
+use crate::{theme::ActiveTheme as _, Sizable, Size};
+use gpui::{
+    div, prelude::FluentBuilder as _, relative, Div, Hsla, InteractiveElement as _, IntoElement,
+    ParentElement, RenderOnce, Styled,
+};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum BadgeVariant {
+    #[default]
+    Primary,
+    Secondary,
+    Outline,
+    Destructive,
+    Custom {
+        color: Hsla,
+        foreground: Hsla,
+        border: Hsla,
+    },
+}
+impl BadgeVariant {
+    fn bg(&self, cx: &gpui::WindowContext) -> Hsla {
+        match self {
+            Self::Primary => cx.theme().primary,
+            Self::Secondary => cx.theme().secondary,
+            Self::Outline => gpui::transparent_black(),
+            Self::Destructive => cx.theme().destructive,
+            Self::Custom { color, .. } => *color,
+        }
+    }
+
+    fn border(&self, cx: &gpui::WindowContext) -> Hsla {
+        match self {
+            Self::Primary => cx.theme().primary,
+            Self::Secondary => cx.theme().secondary,
+            Self::Outline => cx.theme().border,
+            Self::Destructive => cx.theme().destructive,
+            Self::Custom { border, .. } => *border,
+        }
+    }
+
+    fn fg(&self, cx: &gpui::WindowContext) -> Hsla {
+        match self {
+            Self::Primary => cx.theme().primary_foreground,
+            Self::Secondary => cx.theme().secondary_foreground,
+            Self::Outline => cx.theme().foreground,
+            Self::Destructive => cx.theme().destructive_foreground,
+            Self::Custom { foreground, .. } => *foreground,
+        }
+    }
+}
+
+/// Badge is a small status indicator for UI elements.
+///
+/// Only support: Medium, Small
+#[derive(IntoElement)]
+pub struct Badge {
+    base: Div,
+    veriant: BadgeVariant,
+    size: Size,
+}
+impl Badge {
+    fn new() -> Self {
+        Self {
+            base: div().flex().items_center().rounded_md().border_1(),
+            veriant: BadgeVariant::default(),
+            size: Size::Medium,
+        }
+    }
+
+    pub fn with_variant(mut self, variant: BadgeVariant) -> Self {
+        self.veriant = variant;
+        self
+    }
+
+    pub fn primary() -> Self {
+        Self::new().with_variant(BadgeVariant::Primary)
+    }
+
+    pub fn secondary() -> Self {
+        Self::new().with_variant(BadgeVariant::Secondary)
+    }
+
+    pub fn outline() -> Self {
+        Self::new().with_variant(BadgeVariant::Outline)
+    }
+
+    pub fn destructive() -> Self {
+        Self::new().with_variant(BadgeVariant::Destructive)
+    }
+
+    pub fn custom(color: Hsla, foreground: Hsla, border: Hsla) -> Self {
+        Self::new().with_variant(BadgeVariant::Custom {
+            color,
+            foreground,
+            border,
+        })
+    }
+}
+impl Sizable for Badge {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+impl ParentElement for Badge {
+    fn extend(&mut self, elements: impl IntoIterator<Item = gpui::AnyElement>) {
+        self.base.extend(elements);
+    }
+}
+impl RenderOnce for Badge {
+    fn render(self, cx: &mut gpui::WindowContext) -> impl IntoElement {
+        self.base
+            .line_height(relative(1.3))
+            .map(|this| match self.size {
+                Size::XSmall | Size::Small => this.text_xs().px_1p5().py_0(),
+                _ => this.text_xs().px_2p5().py_0p5(),
+            })
+            .bg(self.veriant.bg(cx))
+            .text_color(self.veriant.fg(cx))
+            .border_color(self.veriant.border(cx))
+            .hover(|this| this.opacity(0.9))
+    }
+}

crates/ui/src/breadcrumb.rs

@@ -0,0 +1,118 @@
+use std::rc::Rc;
+
+use gpui::{
+    div, prelude::FluentBuilder as _, ClickEvent, ElementId, InteractiveElement as _, IntoElement,
+    ParentElement, RenderOnce, SharedString, StatefulInteractiveElement, Styled, WindowContext,
+};
+
+use crate::{h_flex, theme::ActiveTheme, Icon, IconName};
+
+#[derive(IntoElement)]
+pub struct Breadcrumb {
+    items: Vec<BreadcrumbItem>,
+}
+
+#[derive(IntoElement)]
+pub struct BreadcrumbItem {
+    id: ElementId,
+    text: SharedString,
+    on_click: Option<Rc<dyn Fn(&ClickEvent, &mut WindowContext)>>,
+    disabled: bool,
+    is_last: bool,
+}
+
+impl BreadcrumbItem {
+    pub fn new(id: impl Into<ElementId>, text: impl Into<SharedString>) -> Self {
+        Self {
+            id: id.into(),
+            text: text.into(),
+            on_click: None,
+            disabled: false,
+            is_last: false,
+        }
+    }
+
+    pub fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+
+    pub fn on_click(
+        mut self,
+        on_click: impl Fn(&ClickEvent, &mut WindowContext) + 'static,
+    ) -> Self {
+        self.on_click = Some(Rc::new(on_click));
+        self
+    }
+
+    /// For internal use only.
+    fn is_last(mut self, is_last: bool) -> Self {
+        self.is_last = is_last;
+        self
+    }
+}
+
+impl RenderOnce for BreadcrumbItem {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        div()
+            .id(self.id)
+            .child(self.text)
+            .text_color(cx.theme().muted_foreground)
+            .when(self.is_last, |this| this.text_color(cx.theme().foreground))
+            .when(self.disabled, |this| {
+                this.text_color(cx.theme().muted_foreground)
+            })
+            .when(!self.disabled, |this| {
+                this.when_some(self.on_click, |this, on_click| {
+                    this.cursor_pointer().on_click(move |event, cx| {
+                        on_click(event, cx);
+                    })
+                })
+            })
+    }
+}
+
+impl Breadcrumb {
+    pub fn new() -> Self {
+        Self { items: Vec::new() }
+    }
+
+    /// Add an item to the breadcrumb.
+    pub fn item(mut self, item: BreadcrumbItem) -> Self {
+        self.items.push(item);
+        self
+    }
+}
+
+#[derive(IntoElement)]
+struct BreadcrumbSeparator;
+impl RenderOnce for BreadcrumbSeparator {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        Icon::new(IconName::ChevronRight)
+            .text_color(cx.theme().muted_foreground)
+            .size_3p5()
+            .into_any_element()
+    }
+}
+
+impl RenderOnce for Breadcrumb {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let items_count = self.items.len();
+
+        let mut children = vec![];
+        for (ix, item) in self.items.into_iter().enumerate() {
+            let is_last = ix == items_count - 1;
+
+            children.push(item.is_last(is_last).into_any_element());
+            if !is_last {
+                children.push(BreadcrumbSeparator.into_any_element());
+            }
+        }
+
+        h_flex()
+            .gap_1p5()
+            .text_sm()
+            .text_color(cx.theme().muted_foreground)
+            .children(children)
+    }
+}

crates/ui/src/button.rs

@@ -0,0 +1,667 @@
+use crate::{
+    h_flex,
+    indicator::Indicator,
+    theme::{ActiveTheme, Colorize as _},
+    tooltip::Tooltip,
+    Disableable, Icon, Selectable, Sizable, Size,
+};
+use gpui::{
+    div, prelude::FluentBuilder as _, px, relative, AnyElement, ClickEvent, Corners, Div, Edges,
+    ElementId, Hsla, InteractiveElement, IntoElement, MouseButton, ParentElement, Pixels,
+    RenderOnce, SharedString, StatefulInteractiveElement as _, Styled, WindowContext,
+};
+
+pub enum ButtonRounded {
+    None,
+    Small,
+    Medium,
+    Large,
+    Size(Pixels),
+}
+
+impl From<Pixels> for ButtonRounded {
+    fn from(px: Pixels) -> Self {
+        ButtonRounded::Size(px)
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub struct ButtonCustomVariant {
+    color: Hsla,
+    foreground: Hsla,
+    border: Hsla,
+    shadow: bool,
+    hover: Hsla,
+    active: Hsla,
+}
+
+pub trait ButtonVariants: Sized {
+    fn with_variant(self, variant: ButtonVariant) -> Self;
+
+    /// With the primary style for the Button.
+    fn primary(self) -> Self {
+        self.with_variant(ButtonVariant::Primary)
+    }
+
+    /// With the danger style for the Button.
+    fn danger(self) -> Self {
+        self.with_variant(ButtonVariant::Danger)
+    }
+
+    /// With the outline style for the Button.
+    fn outline(self) -> Self {
+        self.with_variant(ButtonVariant::Outline)
+    }
+
+    /// With the ghost style for the Button.
+    fn ghost(self) -> Self {
+        self.with_variant(ButtonVariant::Ghost)
+    }
+
+    /// With the link style for the Button.
+    fn link(self) -> Self {
+        self.with_variant(ButtonVariant::Link)
+    }
+
+    /// With the text style for the Button, it will no padding look like a normal text.
+    fn text(self) -> Self {
+        self.with_variant(ButtonVariant::Text)
+    }
+
+    /// With the custom style for the Button.
+    fn custom(self, style: ButtonCustomVariant) -> Self {
+        self.with_variant(ButtonVariant::Custom(style))
+    }
+}
+
+impl ButtonCustomVariant {
+    pub fn new(cx: &WindowContext) -> Self {
+        Self {
+            color: cx.theme().secondary,
+            foreground: cx.theme().secondary_foreground,
+            border: cx.theme().border,
+            hover: cx.theme().secondary_hover,
+            active: cx.theme().secondary_active,
+            shadow: true,
+        }
+    }
+
+    pub fn color(mut self, color: Hsla) -> Self {
+        self.color = color;
+        self
+    }
+
+    pub fn foreground(mut self, color: Hsla) -> Self {
+        self.foreground = color;
+        self
+    }
+
+    pub fn border(mut self, color: Hsla) -> Self {
+        self.border = color;
+        self
+    }
+
+    pub fn hover(mut self, color: Hsla) -> Self {
+        self.hover = color;
+        self
+    }
+
+    pub fn active(mut self, color: Hsla) -> Self {
+        self.active = color;
+        self
+    }
+
+    pub fn shadow(mut self, shadow: bool) -> Self {
+        self.shadow = shadow;
+        self
+    }
+}
+
+/// The veriant of the Button.
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub enum ButtonVariant {
+    Primary,
+    Secondary,
+    Danger,
+    Outline,
+    Ghost,
+    Link,
+    Text,
+    Custom(ButtonCustomVariant),
+}
+
+impl Default for ButtonVariant {
+    fn default() -> Self {
+        Self::Secondary
+    }
+}
+
+impl ButtonVariant {
+    fn is_link(&self) -> bool {
+        matches!(self, Self::Link)
+    }
+
+    fn is_text(&self) -> bool {
+        matches!(self, Self::Text)
+    }
+
+    fn no_padding(&self) -> bool {
+        self.is_link() || self.is_text()
+    }
+}
+
+/// A Button element.
+#[derive(IntoElement)]
+pub struct Button {
+    pub base: Div,
+    id: ElementId,
+    icon: Option<Icon>,
+    label: Option<SharedString>,
+    children: Vec<AnyElement>,
+    disabled: bool,
+    pub(crate) selected: bool,
+    variant: ButtonVariant,
+    rounded: ButtonRounded,
+    border_corners: Corners<bool>,
+    border_edges: Edges<bool>,
+    size: Size,
+    compact: bool,
+    tooltip: Option<SharedString>,
+    on_click: Option<Box<dyn Fn(&ClickEvent, &mut WindowContext) + 'static>>,
+    pub(crate) stop_propagation: bool,
+    loading: bool,
+    loading_icon: Option<Icon>,
+}
+
+impl From<Button> for AnyElement {
+    fn from(button: Button) -> Self {
+        button.into_any_element()
+    }
+}
+
+impl Button {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            base: div().flex_shrink_0(),
+            id: id.into(),
+            icon: None,
+            label: None,
+            disabled: false,
+            selected: false,
+            variant: ButtonVariant::default(),
+            rounded: ButtonRounded::Medium,
+            border_corners: Corners::all(true),
+            border_edges: Edges::all(true),
+            size: Size::Medium,
+            tooltip: None,
+            on_click: None,
+            stop_propagation: true,
+            loading: false,
+            compact: false,
+            children: Vec::new(),
+            loading_icon: None,
+        }
+    }
+
+    /// Set the border radius of the Button.
+    pub fn rounded(mut self, rounded: impl Into<ButtonRounded>) -> Self {
+        self.rounded = rounded.into();
+        self
+    }
+
+    /// Set the border corners side of the Button.
+    pub(crate) fn border_corners(mut self, corners: impl Into<Corners<bool>>) -> Self {
+        self.border_corners = corners.into();
+        self
+    }
+
+    /// Set the border edges of the Button.
+    pub(crate) fn border_edges(mut self, edges: impl Into<Edges<bool>>) -> Self {
+        self.border_edges = edges.into();
+        self
+    }
+
+    /// Set label to the Button, if no label is set, the button will be in Icon Button mode.
+    pub fn label(mut self, label: impl Into<SharedString>) -> Self {
+        self.label = Some(label.into());
+        self
+    }
+
+    /// Set the icon of the button, if the Button have no label, the button well in Icon Button mode.
+    pub fn icon(mut self, icon: impl Into<Icon>) -> Self {
+        self.icon = Some(icon.into());
+        self
+    }
+
+    /// Set the tooltip of the button.
+    pub fn tooltip(mut self, tooltip: impl Into<SharedString>) -> Self {
+        self.tooltip = Some(tooltip.into());
+        self
+    }
+
+    /// Set true to show the loading indicator.
+    pub fn loading(mut self, loading: bool) -> Self {
+        self.loading = loading;
+        self
+    }
+
+    /// Set the button to compact mode, then padding will be reduced.
+    pub fn compact(mut self) -> Self {
+        self.compact = true;
+        self
+    }
+
+    pub fn on_click(mut self, handler: impl Fn(&ClickEvent, &mut WindowContext) + 'static) -> Self {
+        self.on_click = Some(Box::new(handler));
+        self
+    }
+
+    pub fn stop_propagation(mut self, val: bool) -> Self {
+        self.stop_propagation = val;
+        self
+    }
+
+    pub fn loading_icon(mut self, icon: impl Into<Icon>) -> Self {
+        self.loading_icon = Some(icon.into());
+        self
+    }
+}
+
+impl Disableable for Button {
+    fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+}
+
+impl Selectable for Button {
+    fn element_id(&self) -> &ElementId {
+        &self.id
+    }
+
+    fn selected(mut self, selected: bool) -> Self {
+        self.selected = selected;
+        self
+    }
+}
+
+impl Sizable for Button {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+
+impl ButtonVariants for Button {
+    fn with_variant(mut self, variant: ButtonVariant) -> Self {
+        self.variant = variant;
+        self
+    }
+}
+
+impl Styled for Button {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl ParentElement for Button {
+    fn extend(&mut self, elements: impl IntoIterator<Item = gpui::AnyElement>) {
+        self.children.extend(elements)
+    }
+}
+
+impl InteractiveElement for Button {
+    fn interactivity(&mut self) -> &mut gpui::Interactivity {
+        self.base.interactivity()
+    }
+}
+
+impl RenderOnce for Button {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let style: ButtonVariant = self.variant;
+        let normal_style = style.normal(cx);
+        let icon_size = match self.size {
+            Size::Size(v) => Size::Size(v * 0.75),
+            _ => self.size,
+        };
+
+        self.base
+            .id(self.id)
+            .flex()
+            .items_center()
+            .justify_center()
+            .cursor_pointer()
+            .overflow_hidden()
+            .when(cx.theme().shadow && normal_style.shadow, |this| {
+                this.shadow_sm()
+            })
+            .when(!style.no_padding(), |this| {
+                if self.label.is_none() && self.children.is_empty() {
+                    // Icon Button
+                    match self.size {
+                        Size::Size(px) => this.size(px),
+                        Size::XSmall => this.size_5(),
+                        Size::Small => this.size_6(),
+                        Size::Large | Size::Medium => this.size_8(),
+                    }
+                } else {
+                    // Normal Button
+                    match self.size {
+                        Size::Size(size) => this.px(size * 0.2),
+                        Size::XSmall => this.h_5().px_1(),
+                        Size::Small => this.h_6().px_3().when(self.compact, |this| this.px_1p5()),
+                        _ => this.h_8().px_4().when(self.compact, |this| this.px_2()),
+                    }
+                }
+            })
+            .when(
+                self.border_corners.top_left && self.border_corners.bottom_left,
+                |this| match self.rounded {
+                    ButtonRounded::Small => this.rounded_l(px(cx.theme().radius * 0.5)),
+                    ButtonRounded::Medium => this.rounded_l(px(cx.theme().radius)),
+                    ButtonRounded::Large => this.rounded_l(px(cx.theme().radius * 2.0)),
+                    ButtonRounded::Size(px) => this.rounded_l(px),
+                    ButtonRounded::None => this.rounded_none(),
+                },
+            )
+            .when(
+                self.border_corners.top_right && self.border_corners.bottom_right,
+                |this| match self.rounded {
+                    ButtonRounded::Small => this.rounded_r(px(cx.theme().radius * 0.5)),
+                    ButtonRounded::Medium => this.rounded_r(px(cx.theme().radius)),
+                    ButtonRounded::Large => this.rounded_r(px(cx.theme().radius * 2.0)),
+                    ButtonRounded::Size(px) => this.rounded_r(px),
+                    ButtonRounded::None => this.rounded_none(),
+                },
+            )
+            .when(self.border_edges.left, |this| this.border_l_1())
+            .when(self.border_edges.right, |this| this.border_r_1())
+            .when(self.border_edges.top, |this| this.border_t_1())
+            .when(self.border_edges.bottom, |this| this.border_b_1())
+            .text_color(normal_style.fg)
+            .when(self.selected, |this| {
+                let selected_style = style.selected(cx);
+                this.bg(selected_style.bg)
+                    .border_color(selected_style.border)
+                    .text_color(selected_style.fg)
+            })
+            .when(!self.disabled && !self.selected, |this| {
+                this.border_color(normal_style.border)
+                    .bg(normal_style.bg)
+                    .when(normal_style.underline, |this| this.text_decoration_1())
+                    .hover(|this| {
+                        let hover_style = style.hovered(cx);
+                        this.bg(hover_style.bg)
+                            .border_color(hover_style.border)
+                            .text_color(crate::red_400())
+                    })
+                    .active(|this| {
+                        let active_style = style.active(cx);
+                        this.bg(active_style.bg)
+                            .border_color(active_style.border)
+                            .text_color(active_style.fg)
+                    })
+            })
+            .when_some(
+                self.on_click.filter(|_| !self.disabled && !self.loading),
+                |this, on_click| {
+                    let stop_propagation = self.stop_propagation;
+                    this.on_mouse_down(MouseButton::Left, move |_, cx| {
+                        cx.prevent_default();
+                        if stop_propagation {
+                            cx.stop_propagation();
+                        }
+                    })
+                    .on_click(move |event, cx| {
+                        (on_click)(event, cx);
+                    })
+                },
+            )
+            .when(self.disabled, |this| {
+                let disabled_style = style.disabled(cx);
+                this.cursor_not_allowed()
+                    .bg(disabled_style.bg)
+                    .text_color(disabled_style.fg)
+                    .border_color(disabled_style.border)
+                    .shadow_none()
+            })
+            .child({
+                h_flex()
+                    .id("label")
+                    .items_center()
+                    .justify_center()
+                    .map(|this| match self.size {
+                        Size::XSmall => this.gap_1().text_xs(),
+                        Size::Small => this.gap_1().text_sm(),
+                        _ => this.gap_2().text_base(),
+                    })
+                    .when(!self.loading, |this| {
+                        this.when_some(self.icon, |this, icon| {
+                            this.child(icon.with_size(icon_size))
+                        })
+                    })
+                    .when(self.loading, |this| {
+                        this.child(
+                            Indicator::new()
+                                .with_size(self.size)
+                                .when_some(self.loading_icon, |this, icon| this.icon(icon)),
+                        )
+                    })
+                    .when_some(self.label, |this, label| {
+                        this.child(div().flex_none().line_height(relative(1.)).child(label))
+                    })
+                    .children(self.children)
+            })
+            .when(self.loading, |this| this.bg(normal_style.bg.opacity(0.8)))
+            .when_some(self.tooltip.clone(), |this, tooltip| {
+                this.tooltip(move |cx| Tooltip::new(tooltip.clone(), cx))
+            })
+    }
+}
+
+struct ButtonVariantStyle {
+    bg: Hsla,
+    border: Hsla,
+    fg: Hsla,
+    underline: bool,
+    shadow: bool,
+}
+
+impl ButtonVariant {
+    fn bg_color(&self, cx: &WindowContext) -> Hsla {
+        match self {
+            ButtonVariant::Primary => cx.theme().primary,
+            ButtonVariant::Secondary => cx.theme().secondary,
+            ButtonVariant::Danger => cx.theme().destructive,
+            ButtonVariant::Outline
+            | ButtonVariant::Ghost
+            | ButtonVariant::Link
+            | ButtonVariant::Text => cx.theme().transparent,
+            ButtonVariant::Custom(colors) => colors.color,
+        }
+    }
+
+    fn text_color(&self, cx: &WindowContext) -> Hsla {
+        match self {
+            ButtonVariant::Primary => cx.theme().primary_foreground,
+            ButtonVariant::Secondary | ButtonVariant::Outline | ButtonVariant::Ghost => {
+                cx.theme().secondary_foreground
+            }
+            ButtonVariant::Danger => cx.theme().destructive_foreground,
+            ButtonVariant::Link => cx.theme().link,
+            ButtonVariant::Text => cx.theme().foreground,
+            ButtonVariant::Custom(colors) => colors.foreground,
+        }
+    }
+
+    fn border_color(&self, cx: &WindowContext) -> Hsla {
+        match self {
+            ButtonVariant::Primary => cx.theme().primary,
+            ButtonVariant::Secondary => cx.theme().border,
+            ButtonVariant::Danger => cx.theme().destructive,
+            ButtonVariant::Outline => cx.theme().border,
+            ButtonVariant::Ghost | ButtonVariant::Link | ButtonVariant::Text => {
+                cx.theme().transparent
+            }
+            ButtonVariant::Custom(colors) => colors.border,
+        }
+    }
+
+    fn underline(&self, _: &WindowContext) -> bool {
+        match self {
+            ButtonVariant::Link => true,
+            _ => false,
+        }
+    }
+
+    fn shadow(&self, _: &WindowContext) -> bool {
+        match self {
+            ButtonVariant::Primary | ButtonVariant::Secondary | ButtonVariant::Danger => true,
+            ButtonVariant::Custom(c) => c.shadow,
+            _ => false,
+        }
+    }
+
+    fn normal(&self, cx: &WindowContext) -> ButtonVariantStyle {
+        let bg = self.bg_color(cx);
+        let border = self.border_color(cx);
+        let fg = self.text_color(cx);
+        let underline = self.underline(cx);
+        let shadow = self.shadow(cx);
+
+        ButtonVariantStyle {
+            bg,
+            border,
+            fg,
+            underline,
+            shadow,
+        }
+    }
+
+    fn hovered(&self, cx: &WindowContext) -> ButtonVariantStyle {
+        let bg = match self {
+            ButtonVariant::Primary => cx.theme().primary_hover,
+            ButtonVariant::Secondary | ButtonVariant::Outline => cx.theme().secondary_hover,
+            ButtonVariant::Danger => cx.theme().destructive_hover,
+            ButtonVariant::Ghost => {
+                if cx.theme().mode.is_dark() {
+                    cx.theme().secondary.lighten(0.1).opacity(0.8)
+                } else {
+                    cx.theme().secondary.darken(0.1).opacity(0.8)
+                }
+            }
+            ButtonVariant::Link => cx.theme().transparent,
+            ButtonVariant::Text => cx.theme().transparent,
+            ButtonVariant::Custom(colors) => colors.hover,
+        };
+        let border = self.border_color(cx);
+        let fg = match self {
+            ButtonVariant::Link => cx.theme().link_hover,
+            _ => self.text_color(cx),
+        };
+        let underline = self.underline(cx);
+        let shadow = self.shadow(cx);
+
+        ButtonVariantStyle {
+            bg,
+            border,
+            fg,
+            underline,
+            shadow,
+        }
+    }
+
+    fn active(&self, cx: &WindowContext) -> ButtonVariantStyle {
+        let bg = match self {
+            ButtonVariant::Primary => cx.theme().primary_active,
+            ButtonVariant::Secondary | ButtonVariant::Outline | ButtonVariant::Ghost => {
+                cx.theme().secondary_active
+            }
+            ButtonVariant::Danger => cx.theme().destructive_active,
+            ButtonVariant::Link => cx.theme().transparent,
+            ButtonVariant::Text => cx.theme().transparent,
+            ButtonVariant::Custom(colors) => colors.active,
+        };
+        let border = self.border_color(cx);
+        let fg = match self {
+            ButtonVariant::Link => cx.theme().link_active,
+            ButtonVariant::Text => cx.theme().foreground.opacity(0.7),
+            _ => self.text_color(cx),
+        };
+        let underline = self.underline(cx);
+        let shadow = self.shadow(cx);
+
+        ButtonVariantStyle {
+            bg,
+            border,
+            fg,
+            underline,
+            shadow,
+        }
+    }
+
+    fn selected(&self, cx: &WindowContext) -> ButtonVariantStyle {
+        let bg = match self {
+            ButtonVariant::Primary => cx.theme().primary_active,
+            ButtonVariant::Secondary | ButtonVariant::Outline | ButtonVariant::Ghost => {
+                cx.theme().secondary_active
+            }
+            ButtonVariant::Danger => cx.theme().destructive_active,
+            ButtonVariant::Link => cx.theme().transparent,
+            ButtonVariant::Text => cx.theme().transparent,
+            ButtonVariant::Custom(colors) => colors.active,
+        };
+        let border = self.border_color(cx);
+        let fg = match self {
+            ButtonVariant::Link => cx.theme().link_active,
+            ButtonVariant::Text => cx.theme().foreground.opacity(0.7),
+            _ => self.text_color(cx),
+        };
+        let underline = self.underline(cx);
+        let shadow = self.shadow(cx);
+
+        ButtonVariantStyle {
+            bg,
+            border,
+            fg,
+            underline,
+            shadow,
+        }
+    }
+
+    fn disabled(&self, cx: &WindowContext) -> ButtonVariantStyle {
+        let bg = match self {
+            ButtonVariant::Link
+            | ButtonVariant::Ghost
+            | ButtonVariant::Outline
+            | ButtonVariant::Text => cx.theme().transparent,
+            ButtonVariant::Primary => cx.theme().primary.opacity(0.15),
+            ButtonVariant::Danger => cx.theme().destructive.opacity(0.15),
+            ButtonVariant::Secondary => cx.theme().secondary.opacity(1.5),
+            ButtonVariant::Custom(style) => style.color.opacity(0.15),
+        };
+        let fg = match self {
+            ButtonVariant::Link | ButtonVariant::Text | ButtonVariant::Ghost => {
+                cx.theme().link.grayscale()
+            }
+            _ => cx.theme().secondary_foreground.opacity(0.5).grayscale(),
+        };
+
+        let border = match self {
+            ButtonVariant::Outline => cx.theme().border.opacity(0.5),
+            _ => bg,
+        };
+
+        let underline = self.underline(cx);
+        let shadow = false;
+
+        ButtonVariantStyle {
+            bg,
+            border,
+            fg,
+            underline,
+            shadow,
+        }
+    }
+}

crates/ui/src/button_group.rs

@@ -0,0 +1,198 @@
+use gpui::{
+    div, prelude::FluentBuilder as _, Corners, Div, Edges, ElementId, InteractiveElement,
+    IntoElement, ParentElement, RenderOnce, StatefulInteractiveElement as _, Styled, WindowContext,
+};
+use std::{cell::Cell, rc::Rc};
+
+use crate::{
+    button::{Button, ButtonVariant, ButtonVariants},
+    Disableable, Sizable, Size,
+};
+
+/// A ButtonGroup element, to wrap multiple buttons in a group.
+#[derive(IntoElement)]
+pub struct ButtonGroup {
+    pub base: Div,
+    id: ElementId,
+    children: Vec<Button>,
+    multiple: bool,
+    disabled: bool,
+
+    // The button props
+    compact: Option<bool>,
+    variant: Option<ButtonVariant>,
+    size: Option<Size>,
+
+    on_click: Option<Box<dyn Fn(&Vec<usize>, &mut WindowContext) + 'static>>,
+}
+
+impl Disableable for ButtonGroup {
+    fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+}
+
+impl ButtonGroup {
+    /// Creates a new ButtonGroup.
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            base: div(),
+            children: Vec::new(),
+            id: id.into(),
+            variant: None,
+            size: None,
+            compact: None,
+            multiple: false,
+            disabled: false,
+            on_click: None,
+        }
+    }
+
+    /// Adds a button as a child to the ButtonGroup.
+    pub fn child(mut self, child: Button) -> Self {
+        self.children.push(child.disabled(self.disabled));
+        self
+    }
+
+    /// With the multiple selection mode.
+    pub fn multiple(mut self, multiple: bool) -> Self {
+        self.multiple = multiple;
+        self
+    }
+
+    /// With the compact mode for the ButtonGroup.
+    pub fn compact(mut self) -> Self {
+        self.compact = Some(true);
+        self
+    }
+
+    /// Sets the on_click handler for the ButtonGroup.
+    ///
+    /// The handler first argument is a vector of the selected button indices.
+    pub fn on_click(mut self, handler: impl Fn(&Vec<usize>, &mut WindowContext) + 'static) -> Self {
+        self.on_click = Some(Box::new(handler));
+        self
+    }
+}
+
+impl Sizable for ButtonGroup {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = Some(size.into());
+        self
+    }
+}
+
+impl Styled for ButtonGroup {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl ButtonVariants for ButtonGroup {
+    fn with_variant(mut self, variant: ButtonVariant) -> Self {
+        self.variant = Some(variant);
+        self
+    }
+}
+
+impl RenderOnce for ButtonGroup {
+    fn render(self, _cx: &mut WindowContext) -> impl IntoElement {
+        let children_len = self.children.len();
+        let mut selected_ixs: Vec<usize> = Vec::new();
+        let state = Rc::new(Cell::new(None));
+
+        for (ix, child) in self.children.iter().enumerate() {
+            if child.selected {
+                selected_ixs.push(ix);
+            }
+        }
+
+        self.base
+            .id(self.id)
+            .flex()
+            .items_center()
+            .children(
+                self.children
+                    .into_iter()
+                    .enumerate()
+                    .map(|(child_index, child)| {
+                        let state = Rc::clone(&state);
+                        let child = if children_len == 1 {
+                            child
+                        } else if child_index == 0 {
+                            // First
+                            child
+                                .border_corners(Corners {
+                                    top_left: true,
+                                    top_right: false,
+                                    bottom_left: true,
+                                    bottom_right: false,
+                                })
+                                .border_edges(Edges {
+                                    left: true,
+                                    top: true,
+                                    right: true,
+                                    bottom: true,
+                                })
+                        } else if child_index == children_len - 1 {
+                            // Last
+                            child
+                                .border_edges(Edges {
+                                    left: false,
+                                    top: true,
+                                    right: true,
+                                    bottom: true,
+                                })
+                                .border_corners(Corners {
+                                    top_left: false,
+                                    top_right: true,
+                                    bottom_left: false,
+                                    bottom_right: true,
+                                })
+                        } else {
+                            // Middle
+                            child
+                                .border_corners(Corners::all(false))
+                                .border_edges(Edges {
+                                    left: false,
+                                    top: true,
+                                    right: true,
+                                    bottom: true,
+                                })
+                        }
+                        .stop_propagation(false)
+                        .when_some(self.size, |this, size| this.with_size(size))
+                        .when_some(self.variant, |this, variant| this.with_variant(variant))
+                        .when_some(self.compact, |this, _| this.compact())
+                        .on_click(move |_, _| {
+                            state.set(Some(child_index));
+                        });
+
+                        child
+                    }),
+            )
+            .when_some(
+                self.on_click.filter(|_| !self.disabled),
+                move |this, on_click| {
+                    this.on_click(move |_, cx| {
+                        let mut selected_ixs = selected_ixs.clone();
+                        if let Some(ix) = state.get() {
+                            if self.multiple {
+                                if let Some(pos) = selected_ixs.iter().position(|&i| i == ix) {
+                                    selected_ixs.remove(pos);
+                                } else {
+                                    selected_ixs.push(ix);
+                                }
+                            } else {
+                                selected_ixs.clear();
+                                selected_ixs.push(ix);
+                            }
+                        }
+
+                        on_click(&selected_ixs, cx);
+                    })
+                },
+            )
+    }
+}

crates/ui/src/checkbox.rs

@@ -0,0 +1,131 @@
+use crate::{h_flex, theme::ActiveTheme, v_flex, Disableable, IconName, Selectable};
+use gpui::{
+    div, prelude::FluentBuilder as _, relative, svg, ElementId, InteractiveElement, IntoElement,
+    ParentElement, RenderOnce, SharedString, StatefulInteractiveElement as _, Styled as _,
+    WindowContext,
+};
+
+/// A Checkbox element.
+#[derive(IntoElement)]
+pub struct Checkbox {
+    id: ElementId,
+    label: Option<SharedString>,
+    checked: bool,
+    disabled: bool,
+    on_click: Option<Box<dyn Fn(&bool, &mut WindowContext) + 'static>>,
+}
+
+impl Checkbox {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            id: id.into(),
+            label: None,
+            checked: false,
+            disabled: false,
+            on_click: None,
+        }
+    }
+
+    pub fn label(mut self, label: impl Into<SharedString>) -> Self {
+        self.label = Some(label.into());
+        self
+    }
+
+    pub fn checked(mut self, checked: bool) -> Self {
+        self.checked = checked;
+        self
+    }
+
+    pub fn on_click(mut self, handler: impl Fn(&bool, &mut WindowContext) + 'static) -> Self {
+        self.on_click = Some(Box::new(handler));
+        self
+    }
+}
+
+impl Disableable for Checkbox {
+    fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+}
+
+impl Selectable for Checkbox {
+    fn element_id(&self) -> &ElementId {
+        &self.id
+    }
+
+    fn selected(self, selected: bool) -> Self {
+        self.checked(selected)
+    }
+}
+
+impl RenderOnce for Checkbox {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let (color, icon_color) = if self.disabled {
+            (
+                cx.theme().primary.opacity(0.5),
+                cx.theme().primary_foreground.opacity(0.5),
+            )
+        } else {
+            (cx.theme().primary, cx.theme().primary_foreground)
+        };
+
+        h_flex()
+            .id(self.id)
+            .gap_2()
+            .items_center()
+            .line_height(relative(1.))
+            .child(
+                v_flex()
+                    .relative()
+                    .border_1()
+                    .border_color(color)
+                    .rounded_sm()
+                    .size_4()
+                    .flex_shrink_0()
+                    .map(|this| match self.checked {
+                        false => this.bg(cx.theme().transparent),
+                        _ => this.bg(color),
+                    })
+                    .child(
+                        svg()
+                            .absolute()
+                            .top_px()
+                            .left_px()
+                            .size_3()
+                            .text_color(icon_color)
+                            .map(|this| match self.checked {
+                                true => this.path(IconName::Check.path()),
+                                _ => this,
+                            }),
+                    ),
+            )
+            .map(|this| {
+                if let Some(label) = self.label {
+                    this.text_color(cx.theme().foreground).child(
+                        div()
+                            .w_full()
+                            .overflow_x_hidden()
+                            .text_ellipsis()
+                            .line_height(relative(1.))
+                            .child(label),
+                    )
+                } else {
+                    this
+                }
+            })
+            .when(self.disabled, |this| {
+                this.cursor_not_allowed()
+                    .text_color(cx.theme().muted_foreground)
+            })
+            .when_some(
+                self.on_click.filter(|_| !self.disabled),
+                |this, on_click| {
+                    this.on_click(move |_, cx| {
+                        let checked = !self.checked;
+                        on_click(&checked, cx);
+                    })
+                },
+            )
+    }
+}

crates/ui/src/clipboard.rs

@@ -0,0 +1,152 @@
+use std::{cell::RefCell, rc::Rc, time::Duration};
+
+use gpui::{
+    prelude::FluentBuilder, AnyElement, ClipboardItem, Element, ElementId, GlobalElementId,
+    IntoElement, LayoutId, ParentElement, SharedString, Styled, WindowContext,
+};
+
+use crate::{
+    button::{Button, ButtonVariants as _},
+    h_flex, IconName, Sizable as _,
+};
+
+pub struct Clipboard {
+    id: ElementId,
+    value: SharedString,
+    content_builder: Option<Box<dyn Fn(&mut WindowContext) -> AnyElement>>,
+    copied_callback: Option<Rc<dyn Fn(SharedString, &mut WindowContext)>>,
+}
+
+impl Clipboard {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            id: id.into(),
+            value: "".into(),
+            content_builder: None,
+            copied_callback: None,
+        }
+    }
+
+    pub fn value(mut self, value: impl Into<SharedString>) -> Self {
+        self.value = value.into();
+        self
+    }
+
+    pub fn content<E, F>(mut self, element_builder: F) -> Self
+    where
+        E: IntoElement,
+        F: Fn(&mut WindowContext) -> E + 'static,
+    {
+        self.content_builder = Some(Box::new(move |cx| element_builder(cx).into_any_element()));
+        self
+    }
+
+    pub fn on_copied<F>(mut self, handler: F) -> Self
+    where
+        F: Fn(SharedString, &mut WindowContext) + 'static,
+    {
+        self.copied_callback = Some(Rc::new(handler));
+        self
+    }
+}
+
+impl IntoElement for Clipboard {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+#[derive(Default)]
+pub struct ClipboardState {
+    copied: Rc<RefCell<bool>>,
+}
+
+impl Element for Clipboard {
+    type RequestLayoutState = AnyElement;
+
+    type PrepaintState = ();
+
+    fn id(&self) -> Option<ElementId> {
+        Some(self.id.clone())
+    }
+
+    fn request_layout(
+        &mut self,
+        global_id: Option<&GlobalElementId>,
+        cx: &mut WindowContext,
+    ) -> (LayoutId, Self::RequestLayoutState) {
+        cx.with_element_state::<ClipboardState, _>(global_id.unwrap(), |state, cx| {
+            let state = state.unwrap_or_default();
+
+            let content_element = self
+                .content_builder
+                .as_ref()
+                .map(|builder| builder(cx).into_any_element());
+            let value = self.value.clone();
+            let clipboard_id = self.id.clone();
+            let copied_callback = self.copied_callback.as_ref().map(|c| c.clone());
+            let copied = state.copied.clone();
+            let copide_value = *copied.borrow();
+
+            let mut element = h_flex()
+                .gap_1()
+                .items_center()
+                .when_some(content_element, |this, element| this.child(element))
+                .child(
+                    Button::new(clipboard_id)
+                        .icon(if copide_value {
+                            IconName::Check
+                        } else {
+                            IconName::Copy
+                        })
+                        .ghost()
+                        .xsmall()
+                        .when(!copide_value, |this| {
+                            this.on_click(move |_, cx| {
+                                cx.stop_propagation();
+                                cx.write_to_clipboard(ClipboardItem::new_string(value.to_string()));
+                                *copied.borrow_mut() = true;
+
+                                let copied = copied.clone();
+                                cx.spawn(|cx| async move {
+                                    cx.background_executor().timer(Duration::from_secs(2)).await;
+
+                                    *copied.borrow_mut() = false;
+                                })
+                                .detach();
+
+                                if let Some(callback) = &copied_callback {
+                                    callback(value.clone(), cx);
+                                }
+                            })
+                        }),
+                )
+                .into_any_element();
+
+            ((element.request_layout(cx), element), state)
+        })
+    }
+
+    fn prepaint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<gpui::Pixels>,
+        element: &mut Self::RequestLayoutState,
+        cx: &mut WindowContext,
+    ) {
+        element.prepaint(cx);
+    }
+
+    fn paint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<gpui::Pixels>,
+        element: &mut Self::RequestLayoutState,
+        _: &mut Self::PrepaintState,
+        cx: &mut WindowContext,
+    ) {
+        element.paint(cx)
+    }
+}

crates/ui/src/color_picker.rs

@@ -0,0 +1,377 @@
+use gpui::{
+    anchored, canvas, deferred, div, prelude::FluentBuilder as _, px, relative, AnchorCorner,
+    AppContext, Bounds, ElementId, EventEmitter, FocusHandle, FocusableView, Hsla,
+    InteractiveElement as _, IntoElement, KeyBinding, MouseButton, ParentElement, Pixels, Point,
+    Render, SharedString, StatefulInteractiveElement as _, Styled, View, ViewContext,
+    VisualContext,
+};
+
+use crate::{
+    divider::Divider,
+    h_flex,
+    input::{InputEvent, TextInput},
+    popover::Escape,
+    theme::{ActiveTheme as _, Colorize},
+    tooltip::Tooltip,
+    v_flex, ColorExt as _, Sizable, Size, StyleSized,
+};
+
+const KEY_CONTEXT: &str = "ColorPicker";
+
+pub fn init(cx: &mut AppContext) {
+    cx.bind_keys([KeyBinding::new("escape", Escape, Some(KEY_CONTEXT))])
+}
+
+#[derive(Clone)]
+pub enum ColorPickerEvent {
+    Change(Option<Hsla>),
+}
+
+fn color_palettes() -> Vec<Vec<Hsla>> {
+    use crate::colors::DEFAULT_COLOR;
+    use itertools::Itertools as _;
+
+    macro_rules! c {
+        ($color:tt) => {
+            DEFAULT_COLOR
+                .$color
+                .keys()
+                .sorted()
+                .map(|k| DEFAULT_COLOR.$color.get(k).map(|c| c.hsla).unwrap())
+                .collect::<Vec<_>>()
+        };
+    }
+
+    vec![
+        c!(stone),
+        c!(red),
+        c!(orange),
+        c!(yellow),
+        c!(green),
+        c!(cyan),
+        c!(blue),
+        c!(purple),
+        c!(pink),
+    ]
+}
+
+pub struct ColorPicker {
+    id: ElementId,
+    focus_handle: FocusHandle,
+    value: Option<Hsla>,
+    featured_colors: Vec<Hsla>,
+    hovered_color: Option<Hsla>,
+    label: Option<SharedString>,
+    size: Size,
+    anchor: AnchorCorner,
+    color_input: View<TextInput>,
+
+    open: bool,
+    bounds: Bounds<Pixels>,
+}
+
+impl ColorPicker {
+    pub fn new(id: impl Into<ElementId>, cx: &mut ViewContext<Self>) -> Self {
+        let color_input = cx.new_view(|cx| TextInput::new(cx).xsmall());
+
+        cx.subscribe(&color_input, |this, _, ev: &InputEvent, cx| match ev {
+            InputEvent::Change(value) => {
+                if let Ok(color) = Hsla::parse_hex_string(value) {
+                    this.value = Some(color);
+                    this.hovered_color = Some(color);
+                }
+            }
+            InputEvent::PressEnter => {
+                let val = this.color_input.read(cx).text();
+                if let Ok(color) = Hsla::parse_hex_string(&val) {
+                    this.open = false;
+                    this.update_value(Some(color), true, cx);
+                }
+            }
+            _ => {}
+        })
+        .detach();
+
+        Self {
+            id: id.into(),
+            focus_handle: cx.focus_handle(),
+            featured_colors: vec![
+                crate::black(),
+                crate::gray_600(),
+                crate::gray_400(),
+                crate::white(),
+                crate::red_600(),
+                crate::orange_600(),
+                crate::yellow_600(),
+                crate::green_600(),
+                crate::blue_600(),
+                crate::indigo_600(),
+                crate::purple_600(),
+            ],
+            value: None,
+            hovered_color: None,
+            size: Size::Medium,
+            label: None,
+            anchor: AnchorCorner::TopLeft,
+            color_input,
+            open: false,
+            bounds: Bounds::default(),
+        }
+    }
+
+    /// Set the featured colors to be displayed in the color picker.
+    ///
+    /// This is used to display a set of colors that the user can quickly select from,
+    /// for example provided user's last used colors.
+    pub fn featured_colors(mut self, colors: Vec<Hsla>) -> Self {
+        self.featured_colors = colors;
+        self
+    }
+
+    /// Set current color value.
+    pub fn set_value(&mut self, value: Hsla, cx: &mut ViewContext<Self>) {
+        self.update_value(Some(value), false, cx)
+    }
+
+    /// Set the size of the color picker, default is `Size::Medium`.
+    pub fn size(mut self, size: Size) -> Self {
+        self.size = size;
+        self
+    }
+
+    /// Set the label to be displayed above the color picker.
+    ///
+    /// Default is `None`.
+    pub fn label(mut self, label: impl Into<SharedString>) -> Self {
+        self.label = Some(label.into());
+        self
+    }
+
+    /// Set the anchor corner of the color picker.
+    ///
+    /// Default is `AnchorCorner::TopLeft`.
+    pub fn anchor(mut self, anchor: AnchorCorner) -> Self {
+        self.anchor = anchor;
+        self
+    }
+
+    fn on_escape(&mut self, _: &Escape, cx: &mut ViewContext<Self>) {
+        cx.propagate();
+
+        self.open = false;
+        cx.notify();
+    }
+
+    fn toggle_picker(&mut self, _: &gpui::ClickEvent, cx: &mut ViewContext<Self>) {
+        self.open = !self.open;
+        cx.notify();
+    }
+
+    fn update_value(&mut self, value: Option<Hsla>, emit: bool, cx: &mut ViewContext<Self>) {
+        self.value = value;
+        self.hovered_color = value;
+        self.color_input.update(cx, |view, cx| {
+            if let Some(value) = value {
+                view.set_text(value.to_hex_string(), cx);
+            } else {
+                view.set_text("", cx);
+            }
+        });
+        if emit {
+            cx.emit(ColorPickerEvent::Change(value));
+        }
+        cx.notify();
+    }
+
+    fn render_item(
+        &self,
+        color: Hsla,
+        clickable: bool,
+        cx: &mut ViewContext<Self>,
+    ) -> impl IntoElement {
+        div()
+            .id(SharedString::from(format!(
+                "color-{}",
+                color.to_hex_string()
+            )))
+            .h_5()
+            .w_5()
+            .bg(color)
+            .border_1()
+            .border_color(color.darken(0.1))
+            .when(clickable, |this| {
+                this.cursor_pointer()
+                    .hover(|this| {
+                        this.border_color(color.darken(0.3))
+                            .bg(color.lighten(0.1))
+                            .shadow_sm()
+                    })
+                    .active(|this| this.border_color(color.darken(0.5)).bg(color.darken(0.2)))
+                    .on_mouse_move(cx.listener(move |view, _, cx| {
+                        view.hovered_color = Some(color);
+                        cx.notify();
+                    }))
+                    .on_click(cx.listener(move |view, _, cx| {
+                        view.update_value(Some(color), true, cx);
+                        view.open = false;
+                        cx.notify();
+                    }))
+            })
+    }
+
+    fn render_colors(&self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        v_flex()
+            .gap_3()
+            .child(
+                h_flex().gap_1().children(
+                    self.featured_colors
+                        .iter()
+                        .map(|color| self.render_item(*color, true, cx)),
+                ),
+            )
+            .child(Divider::horizontal())
+            .child(
+                v_flex()
+                    .gap_1()
+                    .children(color_palettes().iter().map(|sub_colors| {
+                        h_flex().gap_1().children(
+                            sub_colors
+                                .iter()
+                                .rev()
+                                .map(|color| self.render_item(*color, true, cx)),
+                        )
+                    })),
+            )
+            .when_some(self.hovered_color, |this, hovered_color| {
+                this.child(Divider::horizontal()).child(
+                    h_flex()
+                        .gap_2()
+                        .items_center()
+                        .child(
+                            div()
+                                .bg(hovered_color)
+                                .flex_shrink_0()
+                                .border_1()
+                                .border_color(hovered_color.darken(0.2))
+                                .size_5()
+                                .rounded(px(cx.theme().radius)),
+                        )
+                        .child(self.color_input.clone()),
+                )
+            })
+    }
+
+    fn resolved_corner(&self, bounds: Bounds<Pixels>) -> Point<Pixels> {
+        match self.anchor {
+            AnchorCorner::TopLeft => AnchorCorner::BottomLeft,
+            AnchorCorner::TopRight => AnchorCorner::BottomRight,
+            AnchorCorner::BottomLeft => AnchorCorner::TopLeft,
+            AnchorCorner::BottomRight => AnchorCorner::TopRight,
+        }
+        .corner(bounds)
+    }
+}
+
+impl Sizable for ColorPicker {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+impl EventEmitter<ColorPickerEvent> for ColorPicker {}
+impl FocusableView for ColorPicker {
+    fn focus_handle(&self, _: &AppContext) -> FocusHandle {
+        self.focus_handle.clone()
+    }
+}
+
+impl Render for ColorPicker {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let display_title: SharedString = if let Some(value) = self.value {
+            value.to_hex_string()
+        } else {
+            "".to_string()
+        }
+        .into();
+
+        let view = cx.view().clone();
+
+        div()
+            .id(self.id.clone())
+            .key_context(KEY_CONTEXT)
+            .track_focus(&self.focus_handle)
+            .on_action(cx.listener(Self::on_escape))
+            .child(
+                h_flex()
+                    .id("color-picker-input")
+                    .cursor_pointer()
+                    .gap_2()
+                    .items_center()
+                    .input_text_size(self.size)
+                    .line_height(relative(1.))
+                    .child(
+                        div()
+                            .id("color-picker-square")
+                            .bg(cx.theme().background)
+                            .border_1()
+                            .border_color(cx.theme().input)
+                            .rounded(px(cx.theme().radius))
+                            .bg(cx.theme().background)
+                            .shadow_sm()
+                            .overflow_hidden()
+                            .size_with(self.size)
+                            .when_some(self.value, |this, value| {
+                                this.bg(value).border_color(value.darken(0.3))
+                            })
+                            .tooltip(move |cx| Tooltip::new(display_title.clone(), cx)),
+                    )
+                    .when_some(self.label.clone(), |this, label| this.child(label))
+                    .on_click(cx.listener(Self::toggle_picker))
+                    .child(
+                        canvas(
+                            move |bounds, cx| view.update(cx, |r, _| r.bounds = bounds),
+                            |_, _, _| {},
+                        )
+                        .absolute()
+                        .size_full(),
+                    ),
+            )
+            .when(self.open, |this| {
+                this.child(
+                    deferred(
+                        anchored()
+                            .anchor(self.anchor)
+                            .snap_to_window_with_margin(px(8.))
+                            .position(self.resolved_corner(self.bounds))
+                            .child(
+                                div()
+                                    .occlude()
+                                    .map(|this| match self.anchor {
+                                        AnchorCorner::TopLeft | AnchorCorner::TopRight => {
+                                            this.mt_1p5()
+                                        }
+                                        AnchorCorner::BottomLeft | AnchorCorner::BottomRight => {
+                                            this.mb_1p5()
+                                        }
+                                    })
+                                    .w_72()
+                                    .overflow_hidden()
+                                    .rounded_lg()
+                                    .p_3()
+                                    .border_1()
+                                    .border_color(cx.theme().border)
+                                    .shadow_lg()
+                                    .rounded_lg()
+                                    .bg(cx.theme().background)
+                                    .on_mouse_up_out(
+                                        MouseButton::Left,
+                                        cx.listener(|view, _, cx| view.on_escape(&Escape, cx)),
+                                    )
+                                    .child(self.render_colors(cx)),
+                            ),
+                    )
+                    .with_priority(1),
+                )
+            })
+    }
+}

crates/ui/src/colors.rs

@@ -0,0 +1,297 @@
+use std::collections::HashMap;
+
+use gpui::Hsla;
+use serde::{de::Error, Deserialize, Deserializer};
+
+use crate::theme::hsl;
+use anyhow::Result;
+
+pub(crate) trait ColorExt {
+    fn to_hex_string(&self) -> String;
+    fn parse_hex_string(hex: &str) -> Result<Hsla>;
+}
+
+impl ColorExt for Hsla {
+    fn to_hex_string(&self) -> String {
+        let rgb = self.to_rgb();
+
+        if rgb.a < 1. {
+            return format!(
+                "#{:02X}{:02X}{:02X}{:02X}",
+                ((rgb.r * 255.) as u32),
+                ((rgb.g * 255.) as u32),
+                ((rgb.b * 255.) as u32),
+                ((self.a * 255.) as u32)
+            );
+        }
+
+        format!(
+            "#{:02X}{:02X}{:02X}",
+            ((rgb.r * 255.) as u32),
+            ((rgb.g * 255.) as u32),
+            ((rgb.b * 255.) as u32)
+        )
+    }
+
+    fn parse_hex_string(hex: &str) -> Result<Hsla> {
+        let hex = hex.trim_start_matches('#');
+        let len = hex.len();
+        if len != 6 && len != 8 {
+            return Err(anyhow::anyhow!("invalid hex color"));
+        }
+
+        let r = u8::from_str_radix(&hex[0..2], 16)? as f32 / 255.;
+        let g = u8::from_str_radix(&hex[2..4], 16)? as f32 / 255.;
+        let b = u8::from_str_radix(&hex[4..6], 16)? as f32 / 255.;
+        let a = if len == 8 {
+            u8::from_str_radix(&hex[6..8], 16)? as f32 / 255.
+        } else {
+            1.
+        };
+
+        let v = gpui::Rgba { r, g, b, a };
+        let color: Hsla = v.into();
+        Ok(color)
+    }
+}
+
+pub(crate) static DEFAULT_COLOR: once_cell::sync::Lazy<ShadcnColors> =
+    once_cell::sync::Lazy::new(|| {
+        serde_json::from_str(include_str!("../colors.json")).expect("failed to parse default-json")
+    });
+
+type ColorScales = HashMap<usize, ShadcnColor>;
+
+mod color_scales {
+    use std::collections::HashMap;
+
+    use super::{ColorScales, ShadcnColor};
+
+    use serde::de::{Deserialize, Deserializer};
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<ColorScales, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let mut map = HashMap::new();
+        for color in Vec::<ShadcnColor>::deserialize(deserializer)? {
+            map.insert(color.scale, color);
+        }
+        Ok(map)
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, serde::Deserialize)]
+pub(crate) struct ShadcnColors {
+    pub(crate) black: ShadcnColor,
+    pub(crate) white: ShadcnColor,
+    #[serde(with = "color_scales")]
+    pub(crate) slate: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) gray: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) zinc: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) neutral: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) stone: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) red: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) orange: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) amber: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) yellow: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) lime: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) green: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) emerald: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) teal: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) cyan: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) sky: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) blue: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) indigo: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) violet: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) purple: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) fuchsia: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) pink: ColorScales,
+    #[serde(with = "color_scales")]
+    pub(crate) rose: ColorScales,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, serde::Deserialize)]
+pub(crate) struct ShadcnColor {
+    #[serde(default)]
+    pub(crate) scale: usize,
+    #[serde(deserialize_with = "from_hsl_channel", alias = "hslChannel")]
+    pub(crate) hsla: Hsla,
+}
+
+/// Deserialize Hsla from a string in the format "210 40% 98%"
+fn from_hsl_channel<'de, D>(deserializer: D) -> Result<Hsla, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s: String = Deserialize::deserialize(deserializer).unwrap();
+
+    let mut parts = s.split_whitespace();
+    if parts.clone().count() != 3 {
+        return Err(D::Error::custom(
+            "expected hslChannel has 3 parts, e.g: '210 40% 98%'",
+        ));
+    }
+
+    fn parse_number(s: &str) -> f32 {
+        s.trim_end_matches('%')
+            .parse()
+            .expect("failed to parse number")
+    }
+
+    let (h, s, l) = (
+        parse_number(parts.next().unwrap()),
+        parse_number(parts.next().unwrap()),
+        parse_number(parts.next().unwrap()),
+    );
+
+    Ok(hsl(h, s, l))
+}
+
+macro_rules! color_method {
+    ($color:tt, $scale:tt) => {
+        paste::paste! {
+            #[inline]
+            #[allow(unused)]
+            pub fn [<$color _ $scale>]() -> Hsla {
+                if let Some(color) = DEFAULT_COLOR.$color.get(&($scale as usize)) {
+                    return color.hsla;
+                }
+
+                black()
+            }
+        }
+    };
+}
+
+macro_rules! color_methods {
+    ($color:tt) => {
+        paste::paste! {
+            /// Get color by scale number.
+            ///
+            /// The possible scale numbers are:
+            /// 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 950
+            ///
+            /// If the scale number is not found, it will return black color.
+            #[inline]
+            pub fn [<$color>](scale: usize) -> Hsla {
+                if let Some(color) = DEFAULT_COLOR.$color.get(&scale) {
+                    return color.hsla;
+                }
+
+                black()
+            }
+        }
+
+        color_method!($color, 50);
+        color_method!($color, 100);
+        color_method!($color, 200);
+        color_method!($color, 300);
+        color_method!($color, 400);
+        color_method!($color, 500);
+        color_method!($color, 600);
+        color_method!($color, 700);
+        color_method!($color, 800);
+        color_method!($color, 900);
+        color_method!($color, 950);
+    };
+}
+
+pub fn black() -> Hsla {
+    DEFAULT_COLOR.black.hsla
+}
+
+pub fn white() -> Hsla {
+    DEFAULT_COLOR.white.hsla
+}
+
+color_methods!(slate);
+color_methods!(gray);
+color_methods!(zinc);
+color_methods!(neutral);
+color_methods!(stone);
+color_methods!(red);
+color_methods!(orange);
+color_methods!(amber);
+color_methods!(yellow);
+color_methods!(lime);
+color_methods!(green);
+color_methods!(emerald);
+color_methods!(teal);
+color_methods!(cyan);
+color_methods!(sky);
+color_methods!(blue);
+color_methods!(indigo);
+color_methods!(violet);
+color_methods!(purple);
+color_methods!(fuchsia);
+color_methods!(pink);
+color_methods!(rose);
+
+#[cfg(test)]
+mod tests {
+    use gpui::{rgb, rgba};
+
+    use super::*;
+
+    #[test]
+    fn test_default_colors() {
+        assert_eq!(white(), hsl(0.0, 0.0, 100.0));
+        assert_eq!(black(), hsl(0.0, 0.0, 0.0));
+
+        assert_eq!(slate_50(), hsl(210.0, 40.0, 98.0));
+        assert_eq!(slate_100(), hsl(210.0, 40.0, 96.1));
+        assert_eq!(slate_900(), hsl(222.2, 47.4, 11.2));
+
+        assert_eq!(red_50(), hsl(0.0, 85.7, 97.3));
+        assert_eq!(yellow_100(), hsl(54.9, 96.7, 88.0));
+        assert_eq!(green_200(), hsl(141.0, 78.9, 85.1));
+        assert_eq!(cyan_300(), hsl(187.0, 92.4, 69.0));
+        assert_eq!(blue_400(), hsl(213.1, 93.9, 67.8));
+        assert_eq!(indigo_500(), hsl(238.7, 83.5, 66.7));
+    }
+
+    #[test]
+    fn test_to_hex_string() {
+        let color: Hsla = rgb(0xf8fafc).into();
+        assert_eq!(color.to_hex_string(), "#F8FAFC");
+
+        let color: Hsla = rgb(0xfef2f2).into();
+        assert_eq!(color.to_hex_string(), "#FEF2F2");
+
+        let color: Hsla = rgba(0x0413fcaa).into();
+        assert_eq!(color.to_hex_string(), "#0413FCAA");
+    }
+
+    #[test]
+    fn test_from_hex_string() {
+        let color: Hsla = Hsla::parse_hex_string("#F8FAFC").unwrap();
+        assert_eq!(color, rgb(0xf8fafc).into());
+
+        let color: Hsla = Hsla::parse_hex_string("#FEF2F2").unwrap();
+        assert_eq!(color, rgb(0xfef2f2).into());
+
+        let color: Hsla = Hsla::parse_hex_string("#0413FCAA").unwrap();
+        assert_eq!(color, rgba(0x0413fcaa).into());
+    }
+}

crates/ui/src/context_menu.rs

@@ -0,0 +1,230 @@
+use std::{cell::RefCell, rc::Rc};
+
+use gpui::{
+    anchored, deferred, div, prelude::FluentBuilder, px, relative, AnchorCorner, AnyElement,
+    DismissEvent, DispatchPhase, Element, ElementId, Focusable, GlobalElementId,
+    InteractiveElement, IntoElement, MouseButton, MouseDownEvent, ParentElement, Pixels, Point,
+    Position, Stateful, Style, View, ViewContext, WindowContext,
+};
+
+use crate::popup_menu::PopupMenu;
+
+pub trait ContextMenuExt: ParentElement + Sized {
+    fn context_menu(
+        self,
+        f: impl Fn(PopupMenu, &mut ViewContext<PopupMenu>) -> PopupMenu + 'static,
+    ) -> Self {
+        self.child(ContextMenu::new("context-menu").menu(f))
+    }
+}
+
+impl<E> ContextMenuExt for Stateful<E> where E: ParentElement {}
+impl<E> ContextMenuExt for Focusable<E> where E: ParentElement {}
+
+/// A context menu that can be shown on right-click.
+pub struct ContextMenu {
+    id: ElementId,
+    menu: Option<Box<dyn Fn(PopupMenu, &mut ViewContext<PopupMenu>) -> PopupMenu + 'static>>,
+    anchor: AnchorCorner,
+}
+
+impl ContextMenu {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            id: id.into(),
+            menu: None,
+            anchor: AnchorCorner::TopLeft,
+        }
+    }
+
+    #[must_use]
+    pub fn menu<F>(mut self, builder: F) -> Self
+    where
+        F: Fn(PopupMenu, &mut ViewContext<PopupMenu>) -> PopupMenu + 'static,
+    {
+        self.menu = Some(Box::new(builder));
+        self
+    }
+
+    fn with_element_state<R>(
+        &mut self,
+        id: &GlobalElementId,
+        cx: &mut WindowContext,
+        f: impl FnOnce(&mut Self, &mut ContextMenuState, &mut WindowContext) -> R,
+    ) -> R {
+        cx.with_optional_element_state::<ContextMenuState, _>(Some(id), |element_state, cx| {
+            let mut element_state = element_state.unwrap().unwrap_or_default();
+            let result = f(self, &mut element_state, cx);
+            (result, Some(element_state))
+        })
+    }
+}
+
+impl IntoElement for ContextMenu {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+pub struct ContextMenuState {
+    menu_view: Rc<RefCell<Option<View<PopupMenu>>>>,
+    menu_element: Option<AnyElement>,
+    open: Rc<RefCell<bool>>,
+    position: Rc<RefCell<Point<Pixels>>>,
+}
+
+impl Default for ContextMenuState {
+    fn default() -> Self {
+        Self {
+            menu_view: Rc::new(RefCell::new(None)),
+            menu_element: None,
+            open: Rc::new(RefCell::new(false)),
+            position: Default::default(),
+        }
+    }
+}
+
+impl Element for ContextMenu {
+    type RequestLayoutState = ContextMenuState;
+    type PrepaintState = ();
+
+    fn id(&self) -> Option<ElementId> {
+        Some(self.id.clone())
+    }
+
+    fn request_layout(
+        &mut self,
+        id: Option<&gpui::GlobalElementId>,
+        cx: &mut WindowContext,
+    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
+        let mut style = Style::default();
+        // Set the layout style relative to the table view to get same size.
+        style.position = Position::Absolute;
+        style.flex_grow = 1.0;
+        style.flex_shrink = 1.0;
+        style.size.width = relative(1.).into();
+        style.size.height = relative(1.).into();
+
+        let anchor = self.anchor;
+
+        self.with_element_state(id.unwrap(), cx, |_, state: &mut ContextMenuState, cx| {
+            let position = state.position.clone();
+            let position = position.borrow();
+            let open = state.open.clone();
+            let menu_view = state.menu_view.borrow().clone();
+
+            let (menu_element, menu_layout_id) = if *open.borrow() {
+                let has_menu_item = menu_view
+                    .as_ref()
+                    .map(|menu| !menu.read(cx).is_empty())
+                    .unwrap_or(false);
+
+                if has_menu_item {
+                    let mut menu_element = deferred(
+                        anchored()
+                            .position(*position)
+                            .snap_to_window_with_margin(px(8.))
+                            .anchor(anchor)
+                            .when_some(menu_view, |this, menu| {
+                                // Focus the menu, so that can be handle the action.
+                                menu.focus_handle(cx).focus(cx);
+
+                                this.child(div().occlude().child(menu.clone()))
+                            }),
+                    )
+                    .with_priority(1)
+                    .into_any();
+
+                    let menu_layout_id = menu_element.request_layout(cx);
+                    (Some(menu_element), Some(menu_layout_id))
+                } else {
+                    (None, None)
+                }
+            } else {
+                (None, None)
+            };
+
+            let mut layout_ids = vec![];
+            if let Some(menu_layout_id) = menu_layout_id {
+                layout_ids.push(menu_layout_id);
+            }
+
+            let layout_id = cx.request_layout(style, layout_ids);
+
+            (
+                layout_id,
+                ContextMenuState {
+                    menu_element,
+
+                    ..Default::default()
+                },
+            )
+        })
+    }
+
+    fn prepaint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<gpui::Pixels>,
+        request_layout: &mut Self::RequestLayoutState,
+        cx: &mut WindowContext,
+    ) -> Self::PrepaintState {
+        if let Some(menu_element) = &mut request_layout.menu_element {
+            menu_element.prepaint(cx);
+        }
+    }
+
+    fn paint(
+        &mut self,
+        id: Option<&gpui::GlobalElementId>,
+        bounds: gpui::Bounds<gpui::Pixels>,
+        request_layout: &mut Self::RequestLayoutState,
+        _: &mut Self::PrepaintState,
+        cx: &mut WindowContext,
+    ) {
+        if let Some(menu_element) = &mut request_layout.menu_element {
+            menu_element.paint(cx);
+        }
+
+        let Some(builder) = self.menu.take() else {
+            return;
+        };
+
+        self.with_element_state(
+            id.unwrap(),
+            cx,
+            |_view, state: &mut ContextMenuState, cx| {
+                let position = state.position.clone();
+                let open = state.open.clone();
+                let menu_view = state.menu_view.clone();
+
+                // When right mouse click, to build content menu, and show it at the mouse position.
+                cx.on_mouse_event(move |event: &MouseDownEvent, phase, cx| {
+                    if phase == DispatchPhase::Bubble
+                        && event.button == MouseButton::Right
+                        && bounds.contains(&event.position)
+                    {
+                        *position.borrow_mut() = event.position;
+                        *open.borrow_mut() = true;
+
+                        let menu =
+                            PopupMenu::build(cx, |menu, cx| (builder)(menu, cx)).into_element();
+
+                        let open = open.clone();
+                        cx.subscribe(&menu, move |_, _: &DismissEvent, cx| {
+                            *open.borrow_mut() = false;
+                            cx.refresh();
+                        })
+                        .detach();
+
+                        *menu_view.borrow_mut() = Some(menu);
+
+                        cx.refresh();
+                    }
+                });
+            },
+        );
+    }
+}

crates/ui/src/divider.rs

@@ -0,0 +1,84 @@
+use gpui::{
+    div, prelude::FluentBuilder as _, px, Axis, Div, Hsla, IntoElement, ParentElement, RenderOnce,
+    SharedString, Styled,
+};
+
+use crate::theme::ActiveTheme;
+
+/// A divider that can be either vertical or horizontal.
+#[derive(IntoElement)]
+pub struct Divider {
+    base: Div,
+    label: Option<SharedString>,
+    axis: Axis,
+    color: Option<Hsla>,
+}
+
+impl Divider {
+    pub fn vertical() -> Self {
+        Self {
+            base: div().h_full(),
+            axis: Axis::Vertical,
+            label: None,
+            color: None,
+        }
+    }
+
+    pub fn horizontal() -> Self {
+        Self {
+            base: div().w_full(),
+            axis: Axis::Horizontal,
+            label: None,
+            color: None,
+        }
+    }
+
+    pub fn label(mut self, label: impl Into<SharedString>) -> Self {
+        self.label = Some(label.into());
+        self
+    }
+
+    pub fn color(mut self, color: impl Into<Hsla>) -> Self {
+        self.color = Some(color.into());
+        self
+    }
+}
+
+impl Styled for Divider {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl RenderOnce for Divider {
+    fn render(self, cx: &mut gpui::WindowContext) -> impl IntoElement {
+        let theme = cx.theme();
+
+        self.base
+            .flex()
+            .flex_shrink_0()
+            .items_center()
+            .justify_center()
+            .child(
+                div()
+                    .absolute()
+                    .map(|this| match self.axis {
+                        Axis::Vertical => this.w(px(1.)).h_full(),
+                        Axis::Horizontal => this.h(px(1.)).w_full(),
+                    })
+                    .bg(self.color.unwrap_or(cx.theme().border)),
+            )
+            .when_some(self.label, |this, label| {
+                this.child(
+                    div()
+                        .px_2()
+                        .py_1()
+                        .mx_auto()
+                        .text_xs()
+                        .bg(cx.theme().background)
+                        .text_color(theme.muted_foreground)
+                        .child(label),
+                )
+            })
+    }
+}

crates/ui/src/dock/dock.rs

@@ -0,0 +1,443 @@
+//! Dock is a fixed container that places at left, bottom, right of the Windows.
+
+use std::sync::Arc;
+
+use gpui::{
+    div, prelude::FluentBuilder as _, px, Axis, Element, Entity, InteractiveElement as _,
+    IntoElement, MouseMoveEvent, MouseUpEvent, ParentElement as _, Pixels, Point, Render,
+    StatefulInteractiveElement, Style, Styled as _, View, ViewContext, VisualContext as _,
+    WeakView, WindowContext,
+};
+use serde::{Deserialize, Serialize};
+
+use crate::{
+    resizable::{HANDLE_PADDING, HANDLE_SIZE, PANEL_MIN_SIZE},
+    theme::ActiveTheme as _,
+    AxisExt as _, StyledExt,
+};
+
+use super::{DockArea, DockItem, PanelView, TabPanel};
+
+#[derive(Clone, Render)]
+struct ResizePanel;
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+pub enum DockPlacement {
+    #[serde(rename = "center")]
+    Center,
+    #[serde(rename = "left")]
+    Left,
+    #[serde(rename = "bottom")]
+    Bottom,
+    #[serde(rename = "right")]
+    Right,
+}
+
+impl DockPlacement {
+    fn axis(&self) -> Axis {
+        match self {
+            Self::Left | Self::Right => Axis::Horizontal,
+            Self::Bottom => Axis::Vertical,
+            Self::Center => unreachable!(),
+        }
+    }
+
+    pub fn is_left(&self) -> bool {
+        matches!(self, Self::Left)
+    }
+
+    pub fn is_bottom(&self) -> bool {
+        matches!(self, Self::Bottom)
+    }
+
+    pub fn is_right(&self) -> bool {
+        matches!(self, Self::Right)
+    }
+}
+
+/// The Dock is a fixed container that places at left, bottom, right of the Windows.
+///
+/// This is unlike Panel, it can't be move or add any other panel.
+pub struct Dock {
+    pub(super) placement: DockPlacement,
+    dock_area: WeakView<DockArea>,
+    pub(crate) panel: DockItem,
+    /// The size is means the width or height of the Dock, if the placement is left or right, the size is width, otherwise the size is height.
+    pub(super) size: Pixels,
+    pub(super) open: bool,
+    /// Whether the Dock is collapsible, default: true
+    pub(super) collapsible: bool,
+
+    // Runtime state
+    /// Whether the Dock is resizing
+    is_resizing: bool,
+}
+
+impl Dock {
+    pub(crate) fn new(
+        dock_area: WeakView<DockArea>,
+        placement: DockPlacement,
+        cx: &mut ViewContext<Self>,
+    ) -> Self {
+        let panel = cx.new_view(|cx| {
+            let mut tab = TabPanel::new(None, dock_area.clone(), cx);
+            tab.closeable = false;
+            tab
+        });
+
+        let panel = DockItem::Tabs {
+            items: Vec::new(),
+            active_ix: 0,
+            view: panel.clone(),
+        };
+
+        Self::subscribe_panel_events(dock_area.clone(), &panel, cx);
+
+        Self {
+            placement,
+            dock_area,
+            panel,
+            open: true,
+            collapsible: true,
+            size: px(200.0),
+            is_resizing: false,
+        }
+    }
+
+    pub fn left(dock_area: WeakView<DockArea>, cx: &mut ViewContext<Self>) -> Self {
+        Self::new(dock_area, DockPlacement::Left, cx)
+    }
+
+    pub fn bottom(dock_area: WeakView<DockArea>, cx: &mut ViewContext<Self>) -> Self {
+        Self::new(dock_area, DockPlacement::Bottom, cx)
+    }
+
+    pub fn right(dock_area: WeakView<DockArea>, cx: &mut ViewContext<Self>) -> Self {
+        Self::new(dock_area, DockPlacement::Right, cx)
+    }
+
+    /// Update the Dock to be collapsible or not.
+    ///
+    /// And if the Dock is not collapsible, it will be open.
+    pub fn set_collapsible(&mut self, collapsible: bool, cx: &mut ViewContext<Self>) {
+        self.collapsible = collapsible;
+        if !collapsible {
+            self.open = true
+        }
+        cx.notify();
+    }
+
+    pub(super) fn from_state(
+        dock_area: WeakView<DockArea>,
+        placement: DockPlacement,
+        size: Pixels,
+        panel: DockItem,
+        open: bool,
+        cx: &mut WindowContext,
+    ) -> Self {
+        Self::subscribe_panel_events(dock_area.clone(), &panel, cx);
+
+        if !open {
+            if let DockItem::Tabs { view, .. } = panel.clone() {
+                view.update(cx, |panel, cx| {
+                    panel.set_collapsed(true, cx);
+                });
+            }
+        }
+
+        Self {
+            placement,
+            dock_area,
+            panel,
+            open,
+            size,
+            collapsible: true,
+            is_resizing: false,
+        }
+    }
+
+    fn subscribe_panel_events(
+        dock_area: WeakView<DockArea>,
+        panel: &DockItem,
+        cx: &mut WindowContext,
+    ) {
+        match panel {
+            DockItem::Tabs { view, .. } => {
+                cx.defer({
+                    let view = view.clone();
+                    move |cx| {
+                        _ = dock_area.update(cx, |this, cx| {
+                            this.subscribe_panel(&view, cx);
+                        });
+                    }
+                });
+            }
+            DockItem::Split { items, view, .. } => {
+                for item in items {
+                    Self::subscribe_panel_events(dock_area.clone(), item, cx);
+                }
+                cx.defer({
+                    let view = view.clone();
+                    move |cx| {
+                        _ = dock_area.update(cx, |this, cx| {
+                            this.subscribe_panel(&view, cx);
+                        });
+                    }
+                });
+            }
+            DockItem::Panel { .. } => {
+                // Not supported
+            }
+        }
+    }
+
+    pub fn set_panel(&mut self, panel: DockItem, cx: &mut ViewContext<Self>) {
+        self.panel = panel;
+        cx.notify();
+    }
+
+    pub fn is_open(&self) -> bool {
+        self.open
+    }
+
+    pub fn toggle_open(&mut self, cx: &mut ViewContext<Self>) {
+        self.set_open(!self.open, cx);
+    }
+
+    /// Returns the size of the Dock, the size is means the width or height of
+    /// the Dock, if the placement is left or right, the size is width,
+    /// otherwise the size is height.
+    pub fn size(&self) -> Pixels {
+        self.size
+    }
+
+    /// Set the size of the Dock.
+    pub fn set_size(&mut self, size: Pixels, cx: &mut ViewContext<Self>) {
+        self.size = size.max(PANEL_MIN_SIZE);
+        cx.notify();
+    }
+
+    /// Set the open state of the Dock.
+    pub fn set_open(&mut self, open: bool, cx: &mut ViewContext<Self>) {
+        self.open = open;
+        let item = self.panel.clone();
+        cx.defer(move |_, cx| {
+            item.set_collapsed(!open, cx);
+        });
+        cx.notify();
+    }
+
+    /// Add item to the Dock.
+    pub fn add_panel(&mut self, panel: Arc<dyn PanelView>, cx: &mut ViewContext<Self>) {
+        self.panel.add_panel(panel, &self.dock_area, cx);
+        cx.notify();
+    }
+
+    fn render_resize_handle(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let axis = self.placement.axis();
+        let neg_offset = -HANDLE_PADDING;
+        let view = cx.view().clone();
+
+        div()
+            .id("resize-handle")
+            .occlude()
+            .absolute()
+            .flex_shrink_0()
+            .when(self.placement.is_left(), |this| {
+                // FIXME: Improve this to let the scroll bar have px(HANDLE_PADDING)
+                this.cursor_col_resize()
+                    .top_0()
+                    .right(px(1.))
+                    .h_full()
+                    .w(HANDLE_SIZE)
+                    .pl(HANDLE_PADDING)
+            })
+            .when(self.placement.is_right(), |this| {
+                this.cursor_col_resize()
+                    .top_0()
+                    .left(neg_offset)
+                    .h_full()
+                    .w(HANDLE_SIZE)
+                    .px(HANDLE_PADDING)
+            })
+            .when(self.placement.is_bottom(), |this| {
+                this.cursor_row_resize()
+                    .top(neg_offset)
+                    .left_0()
+                    .w_full()
+                    .h(HANDLE_SIZE)
+                    .py(HANDLE_PADDING)
+            })
+            .child(
+                div()
+                    .bg(cx.theme().border)
+                    .when(axis.is_horizontal(), |this| this.h_full().w(HANDLE_SIZE))
+                    .when(axis.is_vertical(), |this| this.w_full().h(HANDLE_SIZE)),
+            )
+            .on_drag(ResizePanel {}, move |info, _, cx| {
+                cx.stop_propagation();
+                view.update(cx, |view, _| {
+                    view.is_resizing = true;
+                });
+                cx.new_view(|_| info.clone())
+            })
+    }
+    fn resize(&mut self, mouse_position: Point<Pixels>, cx: &mut ViewContext<Self>) {
+        if !self.is_resizing {
+            return;
+        }
+
+        let dock_area = self
+            .dock_area
+            .upgrade()
+            .expect("DockArea is missing")
+            .read(cx);
+        let area_bounds = dock_area.bounds;
+        let mut left_dock_size = Pixels(0.0);
+        let mut right_dock_size = Pixels(0.0);
+
+        // Get the size of the left dock if it's open and not the current dock
+        if let Some(left_dock) = &dock_area.left_dock {
+            if left_dock.entity_id() != cx.view().entity_id() {
+                let left_dock_read = left_dock.read(cx);
+                if left_dock_read.is_open() {
+                    left_dock_size = left_dock_read.size;
+                }
+            }
+        }
+
+        // Get the size of the right dock if it's open and not the current dock
+        if let Some(right_dock) = &dock_area.right_dock {
+            if right_dock.entity_id() != cx.view().entity_id() {
+                let right_dock_read = right_dock.read(cx);
+                if right_dock_read.is_open() {
+                    right_dock_size = right_dock_read.size;
+                }
+            }
+        }
+
+        let size = match self.placement {
+            DockPlacement::Left => mouse_position.x - area_bounds.left(),
+            DockPlacement::Right => area_bounds.right() - mouse_position.x,
+            DockPlacement::Bottom => area_bounds.bottom() - mouse_position.y,
+            DockPlacement::Center => unreachable!(),
+        };
+        match self.placement {
+            DockPlacement::Left => {
+                let max_size = area_bounds.size.width - PANEL_MIN_SIZE - right_dock_size;
+                self.size = size.clamp(PANEL_MIN_SIZE, max_size);
+            }
+            DockPlacement::Right => {
+                let max_size = area_bounds.size.width - PANEL_MIN_SIZE - left_dock_size;
+                self.size = size.clamp(PANEL_MIN_SIZE, max_size);
+            }
+            DockPlacement::Bottom => {
+                let max_size = area_bounds.size.height - PANEL_MIN_SIZE;
+                self.size = size.clamp(PANEL_MIN_SIZE, max_size);
+            }
+            DockPlacement::Center => unreachable!(),
+        }
+
+        cx.notify();
+    }
+
+    fn done_resizing(&mut self, _: &mut ViewContext<Self>) {
+        self.is_resizing = false;
+    }
+}
+
+impl Render for Dock {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl gpui::IntoElement {
+        if !self.open && !self.placement.is_bottom() {
+            return div();
+        }
+
+        div()
+            .relative()
+            .overflow_hidden()
+            .map(|this| match self.placement {
+                DockPlacement::Left | DockPlacement::Right => this.h_flex().h_full().w(self.size),
+                DockPlacement::Bottom => this.w_full().h(self.size),
+                DockPlacement::Center => unreachable!(),
+            })
+            // Bottom Dock should keep the title bar, then user can click the Toggle button
+            .when(!self.open && self.placement.is_bottom(), |this| {
+                this.h(px(29.))
+            })
+            .map(|this| match &self.panel {
+                DockItem::Split { view, .. } => this.child(view.clone()),
+                DockItem::Tabs { view, .. } => this.child(view.clone()),
+                DockItem::Panel { view, .. } => this.child(view.clone().view()),
+            })
+            .child(self.render_resize_handle(cx))
+            .child(DockElement {
+                view: cx.view().clone(),
+            })
+    }
+}
+
+struct DockElement {
+    view: View<Dock>,
+}
+
+impl IntoElement for DockElement {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+impl Element for DockElement {
+    type RequestLayoutState = ();
+    type PrepaintState = ();
+
+    fn id(&self) -> Option<gpui::ElementId> {
+        None
+    }
+
+    fn request_layout(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        cx: &mut gpui::WindowContext,
+    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
+        (cx.request_layout(Style::default(), None), ())
+    }
+
+    fn prepaint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        _: &mut gpui::WindowContext,
+    ) -> Self::PrepaintState {
+    }
+
+    fn paint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        _: &mut Self::PrepaintState,
+        cx: &mut gpui::WindowContext,
+    ) {
+        cx.on_mouse_event({
+            let view = self.view.clone();
+            move |e: &MouseMoveEvent, phase, cx| {
+                if phase.bubble() {
+                    view.update(cx, |view, cx| view.resize(e.position, cx))
+                }
+            }
+        });
+
+        // When any mouse up, stop dragging
+        cx.on_mouse_event({
+            let view = self.view.clone();
+            move |_: &MouseUpEvent, phase, cx| {
+                if phase.bubble() {
+                    view.update(cx, |view, cx| view.done_resizing(cx));
+                }
+            }
+        })
+    }
+}

crates/ui/src/dock/invalid_panel.rs

@@ -0,0 +1,55 @@
+use gpui::{
+    AppContext, EventEmitter, FocusHandle, FocusableView, ParentElement as _, Render, SharedString,
+    Styled as _, WindowContext,
+};
+
+use crate::theme::ActiveTheme as _;
+
+use super::{DockItemState, Panel, PanelEvent};
+
+pub(crate) struct InvalidPanel {
+    name: SharedString,
+    focus_handle: FocusHandle,
+    old_state: DockItemState,
+}
+
+impl InvalidPanel {
+    pub(crate) fn new(name: &str, state: DockItemState, cx: &mut WindowContext) -> Self {
+        Self {
+            focus_handle: cx.focus_handle(),
+            name: SharedString::from(name.to_owned()),
+            old_state: state,
+        }
+    }
+}
+impl Panel for InvalidPanel {
+    fn panel_name(&self) -> &'static str {
+        "InvalidPanel"
+    }
+
+    fn dump(&self, _cx: &AppContext) -> super::DockItemState {
+        self.old_state.clone()
+    }
+}
+impl EventEmitter<PanelEvent> for InvalidPanel {}
+impl FocusableView for InvalidPanel {
+    fn focus_handle(&self, _: &AppContext) -> FocusHandle {
+        self.focus_handle.clone()
+    }
+}
+impl Render for InvalidPanel {
+    fn render(&mut self, cx: &mut gpui::ViewContext<Self>) -> impl gpui::IntoElement {
+        gpui::div()
+            .size_full()
+            .my_6()
+            .flex()
+            .flex_col()
+            .items_center()
+            .justify_center()
+            .text_color(cx.theme().muted_foreground)
+            .child(format!(
+                "The `{}` panel type is not registered in PanelRegistry.",
+                self.name.clone()
+            ))
+    }
+}

crates/ui/src/dock/mod.rs

@@ -0,0 +1,811 @@
+mod dock;
+mod invalid_panel;
+mod panel;
+mod stack_panel;
+mod state;
+mod tab_panel;
+
+use anyhow::Result;
+pub use dock::*;
+use gpui::{
+    actions, canvas, div, prelude::FluentBuilder, AnyElement, AnyView, AppContext, Axis, Bounds,
+    Edges, Entity as _, EntityId, EventEmitter, InteractiveElement as _, IntoElement,
+    ParentElement as _, Pixels, Render, SharedString, Styled, Subscription, View, ViewContext,
+    VisualContext, WeakView, WindowContext,
+};
+use std::sync::Arc;
+
+pub use panel::*;
+pub use stack_panel::*;
+pub use state::*;
+pub use tab_panel::*;
+
+pub fn init(cx: &mut AppContext) {
+    cx.set_global(PanelRegistry::new());
+}
+
+actions!(dock, [ToggleZoom, ClosePanel]);
+
+pub enum DockEvent {
+    /// The layout of the dock has changed, subscribers this to save the layout.
+    ///
+    /// This event is emitted when every time the layout of the dock has changed,
+    /// So it emits may be too frequently, you may want to debounce the event.
+    LayoutChanged,
+}
+
+/// The main area of the dock.
+pub struct DockArea {
+    id: SharedString,
+    /// The version is used to special the default layout, this is like the `panel_version` in [`Panel`](Panel).
+    version: Option<usize>,
+    pub(crate) bounds: Bounds<Pixels>,
+
+    /// The center view of the dockarea.
+    items: DockItem,
+
+    /// The entity_id of the [`TabPanel`](TabPanel) where each toggle button should be displayed,
+    toggle_button_panels: Edges<Option<EntityId>>,
+
+    /// The left dock of the dock_area.
+    left_dock: Option<View<Dock>>,
+    /// The bottom dock of the dock_area.
+    bottom_dock: Option<View<Dock>>,
+    /// The right dock of the dock_area.
+    right_dock: Option<View<Dock>>,
+    /// The top zoom view of the dock_area, if any.
+    zoom_view: Option<AnyView>,
+
+    /// Lock panels layout, but allow to resize.
+    is_locked: bool,
+
+    /// The panel style, default is [`PanelStyle::Default`](PanelStyle::Default).
+    pub(crate) panel_style: PanelStyle,
+
+    _subscriptions: Vec<Subscription>,
+}
+
+/// DockItem is a tree structure that represents the layout of the dock.
+#[derive(Clone)]
+pub enum DockItem {
+    /// Split layout
+    Split {
+        axis: gpui::Axis,
+        items: Vec<DockItem>,
+        sizes: Vec<Option<Pixels>>,
+        view: View<StackPanel>,
+    },
+    /// Tab layout
+    Tabs {
+        items: Vec<Arc<dyn PanelView>>,
+        active_ix: usize,
+        view: View<TabPanel>,
+    },
+    /// Panel layout
+    Panel { view: Arc<dyn PanelView> },
+}
+
+impl DockItem {
+    /// Create DockItem with split layout, each item of panel have equal size.
+    pub fn split(
+        axis: Axis,
+        items: Vec<DockItem>,
+        dock_area: &WeakView<DockArea>,
+        cx: &mut WindowContext,
+    ) -> Self {
+        let sizes = vec![None; items.len()];
+        Self::split_with_sizes(axis, items, sizes, dock_area, cx)
+    }
+
+    /// Create DockItem with split layout, each item of panel have specified size.
+    ///
+    /// Please note that the `items` and `sizes` must have the same length.
+    /// Set `None` in `sizes` to make the index of panel have auto size.
+    pub fn split_with_sizes(
+        axis: Axis,
+        items: Vec<DockItem>,
+        sizes: Vec<Option<Pixels>>,
+        dock_area: &WeakView<DockArea>,
+        cx: &mut WindowContext,
+    ) -> Self {
+        let mut items = items;
+        let stack_panel = cx.new_view(|cx| {
+            let mut stack_panel = StackPanel::new(axis, cx);
+            for (i, item) in items.iter_mut().enumerate() {
+                let view = item.view();
+                let size = sizes.get(i).copied().flatten();
+                stack_panel.add_panel(view.clone(), size, dock_area.clone(), cx)
+            }
+
+            for (i, item) in items.iter().enumerate() {
+                let view = item.view();
+                let size = sizes.get(i).copied().flatten();
+                stack_panel.add_panel(view.clone(), size, dock_area.clone(), cx)
+            }
+
+            stack_panel
+        });
+
+        cx.defer({
+            let stack_panel = stack_panel.clone();
+            let dock_area = dock_area.clone();
+            move |cx| {
+                _ = dock_area.update(cx, |this, cx| {
+                    this.subscribe_panel(&stack_panel, cx);
+                });
+            }
+        });
+
+        Self::Split {
+            axis,
+            items,
+            sizes,
+            view: stack_panel,
+        }
+    }
+
+    /// Create DockItem with panel layout
+    pub fn panel(panel: Arc<dyn PanelView>) -> Self {
+        Self::Panel { view: panel }
+    }
+
+    /// Create DockItem with tabs layout, items are displayed as tabs.
+    ///
+    /// The `active_ix` is the index of the active tab, if `None` the first tab is active.
+    pub fn tabs(
+        items: Vec<Arc<dyn PanelView>>,
+        active_ix: Option<usize>,
+        dock_area: &WeakView<DockArea>,
+        cx: &mut WindowContext,
+    ) -> Self {
+        let mut new_items: Vec<Arc<dyn PanelView>> = vec![];
+        for item in items.into_iter() {
+            new_items.push(item)
+        }
+        Self::new_tabs(new_items, active_ix, dock_area, cx)
+    }
+
+    pub fn tab<P: Panel>(
+        item: View<P>,
+        dock_area: &WeakView<DockArea>,
+        cx: &mut WindowContext,
+    ) -> Self {
+        Self::new_tabs(vec![Arc::new(item.clone())], None, dock_area, cx)
+    }
+
+    fn new_tabs(
+        items: Vec<Arc<dyn PanelView>>,
+        active_ix: Option<usize>,
+        dock_area: &WeakView<DockArea>,
+        cx: &mut WindowContext,
+    ) -> Self {
+        let active_ix = active_ix.unwrap_or(0);
+        let tab_panel = cx.new_view(|cx| {
+            let mut tab_panel = TabPanel::new(None, dock_area.clone(), cx);
+            for item in items.iter() {
+                tab_panel.add_panel(item.clone(), cx)
+            }
+            tab_panel.active_ix = active_ix;
+            tab_panel
+        });
+
+        Self::Tabs {
+            items,
+            active_ix,
+            view: tab_panel,
+        }
+    }
+
+    /// Returns the views of the dock item.
+    fn view(&self) -> Arc<dyn PanelView> {
+        match self {
+            Self::Split { view, .. } => Arc::new(view.clone()),
+            Self::Tabs { view, .. } => Arc::new(view.clone()),
+            Self::Panel { view, .. } => view.clone(),
+        }
+    }
+
+    /// Find existing panel in the dock item.
+    pub fn find_panel(&self, panel: Arc<dyn PanelView>) -> Option<Arc<dyn PanelView>> {
+        match self {
+            Self::Split { items, .. } => {
+                items.iter().find_map(|item| item.find_panel(panel.clone()))
+            }
+            Self::Tabs { items, .. } => items.iter().find(|item| *item == &panel).cloned(),
+            Self::Panel { view } => Some(view.clone()),
+        }
+    }
+
+    /// Add a panel to the dock item.
+    pub fn add_panel(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        dock_area: &WeakView<DockArea>,
+        cx: &mut WindowContext,
+    ) {
+        match self {
+            Self::Tabs { view, items, .. } => {
+                items.push(panel.clone());
+                view.update(cx, |tab_panel, cx| {
+                    tab_panel.add_panel(panel, cx);
+                });
+            }
+            Self::Split { view, items, .. } => {
+                // Iter items to add panel to the first tabs
+                for item in items.into_iter() {
+                    if let DockItem::Tabs { view, .. } = item {
+                        view.update(cx, |tab_panel, cx| {
+                            tab_panel.add_panel(panel.clone(), cx);
+                        });
+                        return;
+                    }
+                }
+
+                // Unable to find tabs, create new tabs
+                let new_item = Self::tabs(vec![panel.clone()], None, dock_area, cx);
+                items.push(new_item.clone());
+                view.update(cx, |stack_panel, cx| {
+                    stack_panel.add_panel(new_item.view(), None, dock_area.clone(), cx);
+                });
+            }
+            Self::Panel { .. } => {}
+        }
+    }
+
+    pub fn set_collapsed(&self, collapsed: bool, cx: &mut WindowContext) {
+        match self {
+            DockItem::Tabs { view, .. } => {
+                view.update(cx, |tab_panel, cx| {
+                    tab_panel.set_collapsed(collapsed, cx);
+                });
+            }
+            DockItem::Split { items, .. } => {
+                // For each child item, set collapsed state
+                for item in items {
+                    item.set_collapsed(collapsed, cx);
+                }
+            }
+            DockItem::Panel { .. } => {}
+        }
+    }
+
+    /// Recursively traverses to find the left-most and top-most TabPanel.
+    pub(crate) fn left_top_tab_panel(&self, cx: &AppContext) -> Option<View<TabPanel>> {
+        match self {
+            DockItem::Tabs { view, .. } => Some(view.clone()),
+            DockItem::Split { view, .. } => view.read(cx).left_top_tab_panel(true, cx),
+            DockItem::Panel { .. } => None,
+        }
+    }
+
+    /// Recursively traverses to find the right-most and top-most TabPanel.
+    pub(crate) fn right_top_tab_panel(&self, cx: &AppContext) -> Option<View<TabPanel>> {
+        match self {
+            DockItem::Tabs { view, .. } => Some(view.clone()),
+            DockItem::Split { view, .. } => view.read(cx).right_top_tab_panel(true, cx),
+            DockItem::Panel { .. } => None,
+        }
+    }
+}
+
+impl DockArea {
+    pub fn new(
+        id: impl Into<SharedString>,
+        version: Option<usize>,
+        cx: &mut ViewContext<Self>,
+    ) -> Self {
+        let stack_panel = cx.new_view(|cx| StackPanel::new(Axis::Horizontal, cx));
+
+        let dock_item = DockItem::Split {
+            axis: Axis::Horizontal,
+            items: vec![],
+            sizes: vec![],
+            view: stack_panel.clone(),
+        };
+
+        let mut this = Self {
+            id: id.into(),
+            version,
+            bounds: Bounds::default(),
+            items: dock_item,
+            zoom_view: None,
+            toggle_button_panels: Edges::default(),
+            left_dock: None,
+            right_dock: None,
+            bottom_dock: None,
+            is_locked: false,
+            panel_style: PanelStyle::Default,
+            _subscriptions: vec![],
+        };
+
+        this.subscribe_panel(&stack_panel, cx);
+
+        this
+    }
+
+    /// Set the panel style of the dock area.
+    pub fn panel_style(mut self, style: PanelStyle) -> Self {
+        self.panel_style = style;
+        self
+    }
+
+    /// Set version of the dock area.
+    pub fn set_version(&mut self, version: usize, cx: &mut ViewContext<Self>) {
+        self.version = Some(version);
+        cx.notify();
+    }
+
+    // FIXME: Remove this method after 2025-01-01
+    #[deprecated(note = "Use `set_center` instead")]
+    pub fn set_root(&mut self, item: DockItem, cx: &mut ViewContext<Self>) {
+        self.set_center(item, cx);
+    }
+
+    /// The the DockItem as the center of the dock area.
+    ///
+    /// This is used to render at the Center of the DockArea.
+    pub fn set_center(&mut self, item: DockItem, cx: &mut ViewContext<Self>) {
+        self.subscribe_item(&item, cx);
+        self.items = item;
+        self.update_toggle_button_tab_panels(cx);
+        cx.notify();
+    }
+
+    pub fn set_left_dock(
+        &mut self,
+        panel: DockItem,
+        size: Option<Pixels>,
+        open: bool,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.subscribe_item(&panel, cx);
+        let weak_self = cx.view().downgrade();
+        self.left_dock = Some(cx.new_view(|cx| {
+            let mut dock = Dock::left(weak_self.clone(), cx);
+            if let Some(size) = size {
+                dock.set_size(size, cx);
+            }
+            dock.set_panel(panel, cx);
+            dock.set_open(open, cx);
+            dock
+        }));
+        self.update_toggle_button_tab_panels(cx);
+    }
+
+    pub fn set_bottom_dock(
+        &mut self,
+        panel: DockItem,
+        size: Option<Pixels>,
+        open: bool,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.subscribe_item(&panel, cx);
+        let weak_self = cx.view().downgrade();
+        self.bottom_dock = Some(cx.new_view(|cx| {
+            let mut dock = Dock::bottom(weak_self.clone(), cx);
+            if let Some(size) = size {
+                dock.set_size(size, cx);
+            }
+            dock.set_panel(panel, cx);
+            dock.set_open(open, cx);
+            dock
+        }));
+        self.update_toggle_button_tab_panels(cx);
+    }
+
+    pub fn set_right_dock(
+        &mut self,
+        panel: DockItem,
+        size: Option<Pixels>,
+        open: bool,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.subscribe_item(&panel, cx);
+        let weak_self = cx.view().downgrade();
+        self.right_dock = Some(cx.new_view(|cx| {
+            let mut dock = Dock::right(weak_self.clone(), cx);
+            if let Some(size) = size {
+                dock.set_size(size, cx);
+            }
+            dock.set_panel(panel, cx);
+            dock.set_open(open, cx);
+            dock
+        }));
+        self.update_toggle_button_tab_panels(cx);
+    }
+
+    /// Set locked state of the dock area, if locked, the dock area cannot be split or move, but allows to resize panels.
+    pub fn set_locked(&mut self, locked: bool, _: &mut WindowContext) {
+        self.is_locked = locked;
+    }
+
+    /// Determine if the dock area is locked.
+    pub fn is_locked(&self) -> bool {
+        self.is_locked
+    }
+
+    /// Determine if the dock area has a dock at the given placement.
+    pub fn has_dock(&self, placement: DockPlacement) -> bool {
+        match placement {
+            DockPlacement::Left => self.left_dock.is_some(),
+            DockPlacement::Bottom => self.bottom_dock.is_some(),
+            DockPlacement::Right => self.right_dock.is_some(),
+            DockPlacement::Center => false,
+        }
+    }
+
+    /// Determine if the dock at the given placement is open.
+    pub fn is_dock_open(&self, placement: DockPlacement, cx: &AppContext) -> bool {
+        match placement {
+            DockPlacement::Left => self
+                .left_dock
+                .as_ref()
+                .map(|dock| dock.read(cx).is_open())
+                .unwrap_or(false),
+            DockPlacement::Bottom => self
+                .bottom_dock
+                .as_ref()
+                .map(|dock| dock.read(cx).is_open())
+                .unwrap_or(false),
+            DockPlacement::Right => self
+                .right_dock
+                .as_ref()
+                .map(|dock| dock.read(cx).is_open())
+                .unwrap_or(false),
+            DockPlacement::Center => false,
+        }
+    }
+
+    /// Set the dock at the given placement to be open or closed.
+    ///
+    /// Only the left, bottom, right dock can be toggled.
+    pub fn set_dock_collapsible(
+        &mut self,
+        collapsible_edges: Edges<bool>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        if let Some(left_dock) = self.left_dock.as_ref() {
+            left_dock.update(cx, |dock, cx| {
+                dock.set_collapsible(collapsible_edges.left, cx);
+            });
+        }
+
+        if let Some(bottom_dock) = self.bottom_dock.as_ref() {
+            bottom_dock.update(cx, |dock, cx| {
+                dock.set_collapsible(collapsible_edges.bottom, cx);
+            });
+        }
+
+        if let Some(right_dock) = self.right_dock.as_ref() {
+            right_dock.update(cx, |dock, cx| {
+                dock.set_collapsible(collapsible_edges.right, cx);
+            });
+        }
+    }
+
+    /// Determine if the dock at the given placement is collapsible.
+    pub fn is_dock_collapsible(&self, placement: DockPlacement, cx: &AppContext) -> bool {
+        match placement {
+            DockPlacement::Left => self
+                .left_dock
+                .as_ref()
+                .map(|dock| dock.read(cx).collapsible)
+                .unwrap_or(false),
+            DockPlacement::Bottom => self
+                .bottom_dock
+                .as_ref()
+                .map(|dock| dock.read(cx).collapsible)
+                .unwrap_or(false),
+            DockPlacement::Right => self
+                .right_dock
+                .as_ref()
+                .map(|dock| dock.read(cx).collapsible)
+                .unwrap_or(false),
+            DockPlacement::Center => false,
+        }
+    }
+
+    pub fn toggle_dock(&self, placement: DockPlacement, cx: &mut ViewContext<Self>) {
+        let dock = match placement {
+            DockPlacement::Left => &self.left_dock,
+            DockPlacement::Bottom => &self.bottom_dock,
+            DockPlacement::Right => &self.right_dock,
+            DockPlacement::Center => return,
+        };
+
+        if let Some(dock) = dock {
+            dock.update(cx, |view, cx| {
+                view.toggle_open(cx);
+            })
+        }
+    }
+
+    /// Add a panel item to the dock area at the given placement.
+    ///
+    /// If the left, bottom, right dock is not present, it will set the dock at the placement.
+    pub fn add_panel(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        placement: DockPlacement,
+        cx: &mut ViewContext<Self>,
+    ) {
+        let weak_self = cx.view().downgrade();
+        match placement {
+            DockPlacement::Left => {
+                if let Some(dock) = self.left_dock.as_ref() {
+                    dock.update(cx, |dock, cx| dock.add_panel(panel, cx))
+                } else {
+                    self.set_left_dock(
+                        DockItem::tabs(vec![panel], None, &weak_self, cx),
+                        None,
+                        true,
+                        cx,
+                    );
+                }
+            }
+            DockPlacement::Bottom => {
+                if let Some(dock) = self.bottom_dock.as_ref() {
+                    dock.update(cx, |dock, cx| dock.add_panel(panel, cx))
+                } else {
+                    self.set_bottom_dock(
+                        DockItem::tabs(vec![panel], None, &weak_self, cx),
+                        None,
+                        true,
+                        cx,
+                    );
+                }
+            }
+            DockPlacement::Right => {
+                if let Some(dock) = self.right_dock.as_ref() {
+                    dock.update(cx, |dock, cx| dock.add_panel(panel, cx))
+                } else {
+                    self.set_right_dock(
+                        DockItem::tabs(vec![panel], None, &weak_self, cx),
+                        None,
+                        true,
+                        cx,
+                    );
+                }
+            }
+            DockPlacement::Center => {
+                self.items.add_panel(panel, &cx.view().downgrade(), cx);
+            }
+        }
+    }
+
+    /// Load the state of the DockArea from the DockAreaState.
+    ///
+    /// See also [DockeArea::dump].
+    pub fn load(&mut self, state: DockAreaState, cx: &mut ViewContext<Self>) -> Result<()> {
+        self.version = state.version;
+        let weak_self = cx.view().downgrade();
+
+        if let Some(left_dock_state) = state.left_dock {
+            self.left_dock = Some(left_dock_state.to_dock(weak_self.clone(), cx));
+        }
+
+        if let Some(right_dock_state) = state.right_dock {
+            self.right_dock = Some(right_dock_state.to_dock(weak_self.clone(), cx));
+        }
+
+        if let Some(bottom_dock_state) = state.bottom_dock {
+            self.bottom_dock = Some(bottom_dock_state.to_dock(weak_self.clone(), cx));
+        }
+
+        self.items = state.center.to_item(weak_self, cx);
+        self.update_toggle_button_tab_panels(cx);
+        Ok(())
+    }
+
+    /// Dump the dock panels layout to DockItemState.
+    ///
+    /// See also [DockArea::load].
+    pub fn dump(&self, cx: &AppContext) -> DockAreaState {
+        let root = self.items.view();
+        let center = root.dump(cx);
+
+        let left_dock = self
+            .left_dock
+            .as_ref()
+            .map(|dock| DockState::new(dock.clone(), cx));
+        let right_dock = self
+            .right_dock
+            .as_ref()
+            .map(|dock| DockState::new(dock.clone(), cx));
+        let bottom_dock = self
+            .bottom_dock
+            .as_ref()
+            .map(|dock| DockState::new(dock.clone(), cx));
+
+        DockAreaState {
+            version: self.version,
+            center,
+            left_dock,
+            right_dock,
+            bottom_dock,
+        }
+    }
+
+    /// Subscribe event on the panels
+    #[allow(clippy::only_used_in_recursion)]
+    fn subscribe_item(&mut self, item: &DockItem, cx: &mut ViewContext<Self>) {
+        match item {
+            DockItem::Split { items, view, .. } => {
+                for item in items {
+                    self.subscribe_item(item, cx);
+                }
+
+                self._subscriptions
+                    .push(cx.subscribe(view, move |_, _, event, cx| match event {
+                        PanelEvent::LayoutChanged => {
+                            let dock_area = cx.view().clone();
+                            cx.spawn(|_, mut cx| async move {
+                                let _ = cx.update(|cx| {
+                                    let _ = dock_area.update(cx, |view, cx| {
+                                        view.update_toggle_button_tab_panels(cx)
+                                    });
+                                });
+                            })
+                            .detach();
+                            cx.emit(DockEvent::LayoutChanged);
+                        }
+                        _ => {}
+                    }));
+            }
+            DockItem::Tabs { .. } => {
+                // We subscribe to the tab panel event in StackPanel's insert_panel
+            }
+            DockItem::Panel { .. } => {
+                // Not supported
+            }
+        }
+    }
+
+    /// Subscribe zoom event on the panel
+    pub(crate) fn subscribe_panel<P: Panel>(
+        &mut self,
+        view: &View<P>,
+        cx: &mut ViewContext<DockArea>,
+    ) {
+        let subscription = cx.subscribe(view, move |_, panel, event, cx| match event {
+            PanelEvent::ZoomIn => {
+                let dock_area = cx.view().clone();
+                let panel = panel.clone();
+                cx.spawn(|_, mut cx| async move {
+                    let _ = cx.update(|cx| {
+                        let _ = dock_area.update(cx, |dock, cx| {
+                            dock.set_zoomed_in(panel, cx);
+                            cx.notify();
+                        });
+                    });
+                })
+                .detach();
+            }
+            PanelEvent::ZoomOut => {
+                let dock_area = cx.view().clone();
+                cx.spawn(|_, mut cx| async move {
+                    let _ = cx.update(|cx| {
+                        let _ = dock_area.update(cx, |view, cx| view.set_zoomed_out(cx));
+                    });
+                })
+                .detach()
+            }
+            PanelEvent::LayoutChanged => {
+                let dock_area = cx.view().clone();
+                cx.spawn(|_, mut cx| async move {
+                    let _ = cx.update(|cx| {
+                        let _ = dock_area
+                            .update(cx, |view, cx| view.update_toggle_button_tab_panels(cx));
+                    });
+                })
+                .detach();
+                cx.emit(DockEvent::LayoutChanged);
+            }
+        });
+
+        self._subscriptions.push(subscription);
+    }
+
+    /// Returns the ID of the dock area.
+    pub fn id(&self) -> SharedString {
+        self.id.clone()
+    }
+
+    pub fn set_zoomed_in<P: Panel>(&mut self, panel: View<P>, cx: &mut ViewContext<Self>) {
+        self.zoom_view = Some(panel.into());
+        cx.notify();
+    }
+
+    pub fn set_zoomed_out(&mut self, cx: &mut ViewContext<Self>) {
+        self.zoom_view = None;
+        cx.notify();
+    }
+
+    fn render_items(&self, _cx: &mut ViewContext<Self>) -> AnyElement {
+        match &self.items {
+            DockItem::Split { view, .. } => view.clone().into_any_element(),
+            DockItem::Tabs { view, .. } => view.clone().into_any_element(),
+            DockItem::Panel { view, .. } => view.clone().view().into_any_element(),
+        }
+    }
+
+    pub fn update_toggle_button_tab_panels(&mut self, cx: &mut ViewContext<Self>) {
+        // Left toggle button
+        self.toggle_button_panels.left = self
+            .items
+            .left_top_tab_panel(cx)
+            .map(|view| view.entity_id());
+
+        // Right toggle button
+        self.toggle_button_panels.right = self
+            .items
+            .right_top_tab_panel(cx)
+            .map(|view| view.entity_id());
+
+        // Bottom toggle button
+        self.toggle_button_panels.bottom = self
+            .bottom_dock
+            .as_ref()
+            .and_then(|dock| dock.read(cx).panel.left_top_tab_panel(cx))
+            .map(|view| view.entity_id());
+    }
+}
+impl EventEmitter<DockEvent> for DockArea {}
+impl Render for DockArea {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let view = cx.view().clone();
+
+        div()
+            .id("dock-area")
+            .relative()
+            .size_full()
+            .overflow_hidden()
+            .child(
+                canvas(
+                    move |bounds, cx| view.update(cx, |r, _| r.bounds = bounds),
+                    |_, _, _| {},
+                )
+                .absolute()
+                .size_full(),
+            )
+            .map(|this| {
+                if let Some(zoom_view) = self.zoom_view.clone() {
+                    this.child(zoom_view)
+                } else {
+                    this.child(
+                        div()
+                            .flex()
+                            .flex_row()
+                            .h_full()
+                            // Left dock
+                            .when_some(self.left_dock.clone(), |this, dock| {
+                                this.child(div().flex().flex_none().child(dock))
+                            })
+                            // Center
+                            .child(
+                                div()
+                                    .flex()
+                                    .flex_1()
+                                    .flex_col()
+                                    .overflow_hidden()
+                                    // Top center
+                                    .child(
+                                        div()
+                                            .flex_1()
+                                            .overflow_hidden()
+                                            .child(self.render_items(cx)),
+                                    )
+                                    // Bottom Dock
+                                    .when_some(self.bottom_dock.clone(), |this, dock| {
+                                        this.child(dock)
+                                    }),
+                            )
+                            // Right Dock
+                            .when_some(self.right_dock.clone(), |this, dock| {
+                                this.child(div().flex().flex_none().child(dock))
+                            }),
+                    )
+                }
+            })
+    }
+}

crates/ui/src/dock/panel.rs

@@ -0,0 +1,186 @@
+use gpui::{
+    AnyElement, AnyView, AppContext, EventEmitter, FocusHandle, FocusableView, Global, Hsla,
+    IntoElement, SharedString, View, WeakView, WindowContext,
+};
+use std::{collections::HashMap, sync::Arc};
+
+use super::{DockArea, DockItemInfo, DockItemState};
+use crate::{button::Button, popup_menu::PopupMenu};
+
+pub enum PanelEvent {
+    ZoomIn,
+    ZoomOut,
+    LayoutChanged,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum PanelStyle {
+    /// Display the TabBar when there are multiple tabs, otherwise display the simple title.
+    Default,
+    /// Always display the tab bar.
+    TabBar,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct TitleStyle {
+    pub background: Hsla,
+    pub foreground: Hsla,
+}
+
+pub trait Panel: EventEmitter<PanelEvent> + FocusableView {
+    /// The name of the panel used to serialize, deserialize and identify the panel.
+    ///
+    /// This is used to identify the panel when deserializing the panel.
+    /// Once you have defined a panel name, this must not be changed.
+    fn panel_name(&self) -> &'static str;
+
+    /// The title of the panel
+    fn title(&self, _cx: &WindowContext) -> AnyElement {
+        SharedString::from("Unnamed").into_any_element()
+    }
+
+    /// The theme of the panel title, default is `None`.
+    fn title_style(&self, _cx: &WindowContext) -> Option<TitleStyle> {
+        None
+    }
+
+    /// Whether the panel can be closed, default is `true`.
+    fn closeable(&self, _cx: &WindowContext) -> bool {
+        true
+    }
+
+    /// Return true if the panel is zoomable, default is `false`.
+    fn zoomable(&self, _cx: &WindowContext) -> bool {
+        true
+    }
+
+    /// The addition popup menu of the panel, default is `None`.
+    fn popup_menu(&self, this: PopupMenu, _cx: &WindowContext) -> PopupMenu {
+        this
+    }
+
+    /// The addition toolbar buttons of the panel used to show in the right of the title bar, default is `None`.
+    fn toolbar_buttons(&self, _cx: &WindowContext) -> Vec<Button> {
+        vec![]
+    }
+
+    /// Dump the panel, used to serialize the panel.
+    fn dump(&self, _cx: &AppContext) -> DockItemState {
+        DockItemState::new(self)
+    }
+}
+
+pub trait PanelView: 'static + Send + Sync {
+    fn panel_name(&self, _cx: &WindowContext) -> &'static str;
+    fn title(&self, _cx: &WindowContext) -> AnyElement;
+    fn title_style(&self, _cx: &WindowContext) -> Option<TitleStyle>;
+    fn closeable(&self, cx: &WindowContext) -> bool;
+    fn zoomable(&self, cx: &WindowContext) -> bool;
+    fn popup_menu(&self, menu: PopupMenu, cx: &WindowContext) -> PopupMenu;
+    fn toolbar_buttons(&self, cx: &WindowContext) -> Vec<Button>;
+    fn view(&self) -> AnyView;
+    fn focus_handle(&self, cx: &AppContext) -> FocusHandle;
+    fn dump(&self, cx: &AppContext) -> DockItemState;
+}
+
+impl<T: Panel> PanelView for View<T> {
+    fn panel_name(&self, cx: &WindowContext) -> &'static str {
+        self.read(cx).panel_name()
+    }
+
+    fn title(&self, cx: &WindowContext) -> AnyElement {
+        self.read(cx).title(cx)
+    }
+
+    fn title_style(&self, cx: &WindowContext) -> Option<TitleStyle> {
+        self.read(cx).title_style(cx)
+    }
+
+    fn closeable(&self, cx: &WindowContext) -> bool {
+        self.read(cx).closeable(cx)
+    }
+
+    fn zoomable(&self, cx: &WindowContext) -> bool {
+        self.read(cx).zoomable(cx)
+    }
+
+    fn popup_menu(&self, menu: PopupMenu, cx: &WindowContext) -> PopupMenu {
+        self.read(cx).popup_menu(menu, cx)
+    }
+
+    fn toolbar_buttons(&self, cx: &WindowContext) -> Vec<Button> {
+        self.read(cx).toolbar_buttons(cx)
+    }
+
+    fn view(&self) -> AnyView {
+        self.clone().into()
+    }
+
+    fn focus_handle(&self, cx: &AppContext) -> FocusHandle {
+        self.read(cx).focus_handle(cx)
+    }
+
+    fn dump(&self, cx: &AppContext) -> DockItemState {
+        self.read(cx).dump(cx)
+    }
+}
+
+impl From<&dyn PanelView> for AnyView {
+    fn from(handle: &dyn PanelView) -> Self {
+        handle.view()
+    }
+}
+
+impl<T: Panel> From<&dyn PanelView> for View<T> {
+    fn from(value: &dyn PanelView) -> Self {
+        value.view().downcast::<T>().unwrap()
+    }
+}
+
+impl PartialEq for dyn PanelView {
+    fn eq(&self, other: &Self) -> bool {
+        self.view() == other.view()
+    }
+}
+
+pub struct PanelRegistry {
+    pub(super) items: HashMap<
+        String,
+        Arc<
+            dyn Fn(
+                WeakView<DockArea>,
+                &DockItemState,
+                &DockItemInfo,
+                &mut WindowContext,
+            ) -> Box<dyn PanelView>,
+        >,
+    >,
+}
+impl PanelRegistry {
+    pub fn new() -> Self {
+        Self {
+            items: HashMap::new(),
+        }
+    }
+}
+impl Global for PanelRegistry {}
+
+/// Register the Panel init by panel_name to global registry.
+pub fn register_panel<F>(cx: &mut AppContext, panel_name: &str, deserialize: F)
+where
+    F: Fn(
+            WeakView<DockArea>,
+            &DockItemState,
+            &DockItemInfo,
+            &mut WindowContext,
+        ) -> Box<dyn PanelView>
+        + 'static,
+{
+    if let None = cx.try_global::<PanelRegistry>() {
+        cx.set_global(PanelRegistry::new());
+    }
+
+    cx.global_mut::<PanelRegistry>()
+        .items
+        .insert(panel_name.to_string(), Arc::new(deserialize));
+}

crates/ui/src/dock/stack_panel.rs

@@ -0,0 +1,379 @@
+use std::sync::Arc;
+
+use crate::{
+    dock::DockItemInfo,
+    h_flex,
+    resizable::{
+        h_resizable, resizable_panel, v_resizable, ResizablePanel, ResizablePanelEvent,
+        ResizablePanelGroup,
+    },
+    theme::ActiveTheme,
+    AxisExt as _, Placement,
+};
+
+use super::{DockArea, DockItemState, Panel, PanelEvent, PanelView, TabPanel};
+use gpui::{
+    prelude::FluentBuilder as _, AppContext, Axis, DismissEvent, EventEmitter, FocusHandle,
+    FocusableView, IntoElement, ParentElement, Pixels, Render, Styled, Subscription, View,
+    ViewContext, VisualContext, WeakView,
+};
+use smallvec::SmallVec;
+
+pub struct StackPanel {
+    pub(super) parent: Option<WeakView<StackPanel>>,
+    pub(super) axis: Axis,
+    focus_handle: FocusHandle,
+    pub(crate) panels: SmallVec<[Arc<dyn PanelView>; 2]>,
+    panel_group: View<ResizablePanelGroup>,
+    _subscriptions: Vec<Subscription>,
+}
+
+impl Panel for StackPanel {
+    fn panel_name(&self) -> &'static str {
+        "StackPanel"
+    }
+
+    fn title(&self, _cx: &gpui::WindowContext) -> gpui::AnyElement {
+        "StackPanel".into_any_element()
+    }
+
+    fn dump(&self, cx: &AppContext) -> DockItemState {
+        let sizes = self.panel_group.read(cx).sizes();
+        let mut state = DockItemState::new(self);
+        for panel in &self.panels {
+            state.add_child(panel.dump(cx));
+            state.info = DockItemInfo::stack(sizes.clone(), self.axis);
+        }
+
+        state
+    }
+}
+
+impl StackPanel {
+    pub fn new(axis: Axis, cx: &mut ViewContext<Self>) -> Self {
+        let panel_group = cx.new_view(|cx| {
+            if axis == Axis::Horizontal {
+                h_resizable(cx)
+            } else {
+                v_resizable(cx)
+            }
+        });
+
+        // Bubble up the resize event.
+        let _subscriptions = vec![cx
+            .subscribe(&panel_group, |_, _, _: &ResizablePanelEvent, cx| {
+                cx.emit(PanelEvent::LayoutChanged)
+            })];
+
+        Self {
+            axis,
+            parent: None,
+            focus_handle: cx.focus_handle(),
+            panels: SmallVec::new(),
+            panel_group,
+            _subscriptions,
+        }
+    }
+
+    /// The first level of the stack panel is root, will not have a parent.
+    fn is_root(&self) -> bool {
+        self.parent.is_none()
+    }
+
+    /// Return true if self or parent only have last panel.
+    pub(super) fn is_last_panel(&self, cx: &AppContext) -> bool {
+        if self.panels.len() > 1 {
+            return false;
+        }
+
+        if let Some(parent) = &self.parent {
+            if let Some(parent) = parent.upgrade() {
+                return parent.read(cx).is_last_panel(cx);
+            }
+        }
+
+        true
+    }
+
+    pub(super) fn panels_len(&self) -> usize {
+        self.panels.len()
+    }
+
+    /// Return the index of the panel.
+    pub(crate) fn index_of_panel(&self, panel: Arc<dyn PanelView>) -> Option<usize> {
+        self.panels.iter().position(|p| p == &panel)
+    }
+
+    /// Add a panel at the end of the stack.
+    pub fn add_panel(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        size: Option<Pixels>,
+        dock_area: WeakView<DockArea>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.insert_panel(panel, self.panels.len(), size, dock_area, cx);
+    }
+
+    pub fn add_panel_at(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        placement: Placement,
+        size: Option<Pixels>,
+        dock_area: WeakView<DockArea>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.insert_panel_at(panel, self.panels_len(), placement, size, dock_area, cx);
+    }
+
+    pub fn insert_panel_at(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        ix: usize,
+        placement: Placement,
+        size: Option<Pixels>,
+        dock_area: WeakView<DockArea>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        match placement {
+            Placement::Top | Placement::Left => {
+                self.insert_panel_before(panel, ix, size, dock_area, cx)
+            }
+            Placement::Right | Placement::Bottom => {
+                self.insert_panel_after(panel, ix, size, dock_area, cx)
+            }
+        }
+    }
+
+    /// Insert a panel at the index.
+    pub fn insert_panel_before(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        ix: usize,
+        size: Option<Pixels>,
+        dock_area: WeakView<DockArea>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.insert_panel(panel, ix, size, dock_area, cx);
+    }
+
+    /// Insert a panel after the index.
+    pub fn insert_panel_after(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        ix: usize,
+        size: Option<Pixels>,
+        dock_area: WeakView<DockArea>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.insert_panel(panel, ix + 1, size, dock_area, cx);
+    }
+
+    fn new_resizable_panel(panel: Arc<dyn PanelView>, size: Option<Pixels>) -> ResizablePanel {
+        resizable_panel()
+            .content_view(panel.view())
+            .when_some(size, |this, size| this.size(size))
+    }
+
+    fn insert_panel(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        ix: usize,
+        size: Option<Pixels>,
+        dock_area: WeakView<DockArea>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        // If the panel is already in the stack, return.
+        if let Some(_) = self.index_of_panel(panel.clone()) {
+            return;
+        }
+
+        let view = cx.view().clone();
+        cx.window_context().defer({
+            let panel = panel.clone();
+
+            move |cx| {
+                // If the panel is a TabPanel, set its parent to this.
+                if let Ok(tab_panel) = panel.view().downcast::<TabPanel>() {
+                    tab_panel.update(cx, |tab_panel, _| tab_panel.set_parent(view.downgrade()));
+                } else if let Ok(stack_panel) = panel.view().downcast::<Self>() {
+                    stack_panel.update(cx, |stack_panel, _| {
+                        stack_panel.parent = Some(view.downgrade())
+                    });
+                }
+
+                // Subscribe to the panel's layout change event.
+                _ = dock_area.update(cx, |this, cx| {
+                    if let Ok(tab_panel) = panel.view().downcast::<TabPanel>() {
+                        this.subscribe_panel(&tab_panel, cx);
+                    } else if let Ok(stack_panel) = panel.view().downcast::<Self>() {
+                        this.subscribe_panel(&stack_panel, cx);
+                    }
+                });
+            }
+        });
+
+        let ix = if ix > self.panels.len() {
+            self.panels.len()
+        } else {
+            ix
+        };
+
+        self.panels.insert(ix, panel.clone());
+        self.panel_group.update(cx, |view, cx| {
+            view.insert_child(Self::new_resizable_panel(panel.clone(), size), ix, cx)
+        });
+
+        cx.emit(PanelEvent::LayoutChanged);
+        cx.notify();
+    }
+
+    /// Remove panel from the stack.
+    pub fn remove_panel(&mut self, panel: Arc<dyn PanelView>, cx: &mut ViewContext<Self>) {
+        if let Some(ix) = self.index_of_panel(panel.clone()) {
+            self.panels.remove(ix);
+            self.panel_group.update(cx, |view, cx| {
+                view.remove_child(ix, cx);
+            });
+
+            cx.emit(PanelEvent::LayoutChanged);
+            self.remove_self_if_empty(cx);
+        } else {
+            println!("Panel not found in stack panel.");
+        }
+    }
+
+    /// Replace the old panel with the new panel at same index.
+    pub(super) fn replace_panel(
+        &mut self,
+        old_panel: Arc<dyn PanelView>,
+        new_panel: View<StackPanel>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        if let Some(ix) = self.index_of_panel(old_panel.clone()) {
+            self.panels[ix] = Arc::new(new_panel.clone());
+            self.panel_group.update(cx, |view, cx| {
+                view.replace_child(
+                    Self::new_resizable_panel(Arc::new(new_panel.clone()), None),
+                    ix,
+                    cx,
+                );
+            });
+            cx.emit(PanelEvent::LayoutChanged);
+        }
+    }
+
+    /// If children is empty, remove self from parent view.
+    pub(crate) fn remove_self_if_empty(&mut self, cx: &mut ViewContext<Self>) {
+        if self.is_root() {
+            return;
+        }
+
+        if !self.panels.is_empty() {
+            return;
+        }
+
+        let view = cx.view().clone();
+        if let Some(parent) = self.parent.as_ref() {
+            _ = parent.update(cx, |parent, cx| {
+                parent.remove_panel(Arc::new(view.clone()), cx);
+            });
+        }
+
+        cx.emit(PanelEvent::LayoutChanged);
+        cx.notify();
+    }
+
+    /// Find the first top left in the stack.
+    pub(super) fn left_top_tab_panel(
+        &self,
+        check_parent: bool,
+        cx: &AppContext,
+    ) -> Option<View<TabPanel>> {
+        if check_parent {
+            if let Some(parent) = self.parent.as_ref().and_then(|parent| parent.upgrade()) {
+                if let Some(panel) = parent.read(cx).left_top_tab_panel(true, cx) {
+                    return Some(panel);
+                }
+            }
+        }
+
+        let first_panel = self.panels.first();
+        if let Some(view) = first_panel {
+            if let Ok(tab_panel) = view.view().downcast::<TabPanel>() {
+                Some(tab_panel)
+            } else if let Ok(stack_panel) = view.view().downcast::<StackPanel>() {
+                stack_panel.read(cx).left_top_tab_panel(false, cx)
+            } else {
+                None
+            }
+        } else {
+            None
+        }
+    }
+
+    /// Find the first top right in the stack.
+    pub(super) fn right_top_tab_panel(
+        &self,
+        check_parent: bool,
+        cx: &AppContext,
+    ) -> Option<View<TabPanel>> {
+        if check_parent {
+            if let Some(parent) = self.parent.as_ref().and_then(|parent| parent.upgrade()) {
+                if let Some(panel) = parent.read(cx).right_top_tab_panel(true, cx) {
+                    return Some(panel);
+                }
+            }
+        }
+
+        let panel = if self.axis.is_vertical() {
+            self.panels.first()
+        } else {
+            self.panels.last()
+        };
+
+        if let Some(view) = panel {
+            if let Ok(tab_panel) = view.view().downcast::<TabPanel>() {
+                Some(tab_panel)
+            } else if let Ok(stack_panel) = view.view().downcast::<StackPanel>() {
+                stack_panel.read(cx).right_top_tab_panel(false, cx)
+            } else {
+                None
+            }
+        } else {
+            None
+        }
+    }
+
+    /// Remove all panels from the stack.
+    pub(super) fn remove_all_panels(&mut self, cx: &mut ViewContext<Self>) {
+        self.panels.clear();
+        self.panel_group
+            .update(cx, |view, cx| view.remove_all_children(cx));
+    }
+
+    /// Change the axis of the stack panel.
+    pub(super) fn set_axis(&mut self, axis: Axis, cx: &mut ViewContext<Self>) {
+        self.axis = axis;
+        self.panel_group
+            .update(cx, |view, cx| view.set_axis(axis, cx));
+        cx.notify();
+    }
+}
+
+impl FocusableView for StackPanel {
+    fn focus_handle(&self, _cx: &AppContext) -> FocusHandle {
+        self.focus_handle.clone()
+    }
+}
+impl EventEmitter<PanelEvent> for StackPanel {}
+impl EventEmitter<DismissEvent> for StackPanel {}
+impl Render for StackPanel {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        h_flex()
+            .size_full()
+            .overflow_hidden()
+            .bg(cx.theme().tab_bar)
+            .child(self.panel_group.clone())
+    }
+}

crates/ui/src/dock/state.rs

@@ -0,0 +1,201 @@
+use gpui::{AppContext, Axis, Pixels, View, VisualContext as _, WeakView, WindowContext};
+use itertools::Itertools as _;
+use serde::{Deserialize, Serialize};
+
+use super::{
+    invalid_panel::InvalidPanel, Dock, DockArea, DockItem, DockPlacement, Panel, PanelRegistry,
+};
+
+/// Used to serialize and deserialize the DockArea
+#[derive(Debug, Default, Clone, Serialize, Deserialize, PartialEq)]
+pub struct DockAreaState {
+    /// The version is used to mark this persisted state is compatible with the current version
+    /// For example, some times we many totally changed the structure of the Panel,
+    /// then we can compare the version to decide whether we can use the state or ignore.
+    #[serde(default)]
+    pub version: Option<usize>,
+    pub center: DockItemState,
+    pub left_dock: Option<DockState>,
+    pub right_dock: Option<DockState>,
+    pub bottom_dock: Option<DockState>,
+}
+
+/// Used to serialize and deserialize the Dock
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct DockState {
+    panel: DockItemState,
+    placement: DockPlacement,
+    size: Pixels,
+    open: bool,
+}
+
+impl DockState {
+    pub fn new(dock: View<Dock>, cx: &AppContext) -> Self {
+        let dock = dock.read(cx);
+
+        Self {
+            placement: dock.placement,
+            size: dock.size,
+            open: dock.open,
+            panel: dock.panel.view().dump(cx),
+        }
+    }
+
+    /// Convert the DockState to Dock
+    pub fn to_dock(&self, dock_area: WeakView<DockArea>, cx: &mut WindowContext) -> View<Dock> {
+        let item = self.panel.to_item(dock_area.clone(), cx);
+        cx.new_view(|cx| {
+            Dock::from_state(
+                dock_area.clone(),
+                self.placement,
+                self.size,
+                item,
+                self.open,
+                cx,
+            )
+        })
+    }
+}
+
+/// Used to serialize and deserialize the DockerItem
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct DockItemState {
+    pub panel_name: String,
+    pub children: Vec<DockItemState>,
+    pub info: DockItemInfo,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub enum DockItemInfo {
+    #[serde(rename = "stack")]
+    Stack {
+        sizes: Vec<Pixels>,
+        /// The axis of the stack, 0 is horizontal, 1 is vertical
+        axis: usize,
+    },
+    #[serde(rename = "tabs")]
+    Tabs { active_index: usize },
+    #[serde(rename = "panel")]
+    Panel(serde_json::Value),
+}
+
+impl DockItemInfo {
+    pub fn stack(sizes: Vec<Pixels>, axis: Axis) -> Self {
+        Self::Stack {
+            sizes,
+            axis: if axis == Axis::Horizontal { 0 } else { 1 },
+        }
+    }
+
+    pub fn tabs(active_index: usize) -> Self {
+        Self::Tabs { active_index }
+    }
+
+    pub fn panel(value: serde_json::Value) -> Self {
+        Self::Panel(value)
+    }
+
+    pub fn axis(&self) -> Option<Axis> {
+        match self {
+            Self::Stack { axis, .. } => Some(if *axis == 0 {
+                Axis::Horizontal
+            } else {
+                Axis::Vertical
+            }),
+            _ => None,
+        }
+    }
+
+    pub fn sizes(&self) -> Option<&Vec<Pixels>> {
+        match self {
+            Self::Stack { sizes, .. } => Some(sizes),
+            _ => None,
+        }
+    }
+
+    pub fn active_index(&self) -> Option<usize> {
+        match self {
+            Self::Tabs { active_index } => Some(*active_index),
+            _ => None,
+        }
+    }
+}
+
+impl Default for DockItemState {
+    fn default() -> Self {
+        Self {
+            panel_name: "".to_string(),
+            children: Vec::new(),
+            info: DockItemInfo::Panel(serde_json::Value::Null),
+        }
+    }
+}
+
+impl DockItemState {
+    pub fn new<P: Panel>(panel: &P) -> Self {
+        Self {
+            panel_name: panel.panel_name().to_string(),
+            ..Default::default()
+        }
+    }
+
+    pub fn add_child(&mut self, panel: DockItemState) {
+        self.children.push(panel);
+    }
+
+    pub fn to_item(&self, dock_area: WeakView<DockArea>, cx: &mut WindowContext) -> DockItem {
+        let info = self.info.clone();
+
+        let items: Vec<DockItem> = self
+            .children
+            .iter()
+            .map(|child| child.to_item(dock_area.clone(), cx))
+            .collect();
+
+        match info {
+            DockItemInfo::Stack { sizes, axis } => {
+                let axis = if axis == 0 {
+                    Axis::Horizontal
+                } else {
+                    Axis::Vertical
+                };
+                let sizes = sizes.iter().map(|s| Some(*s)).collect_vec();
+                DockItem::split_with_sizes(axis, items, sizes, &dock_area, cx)
+            }
+            DockItemInfo::Tabs { active_index } => {
+                if items.len() == 1 {
+                    return items[0].clone();
+                }
+
+                let items = items
+                    .iter()
+                    .flat_map(|item| match item {
+                        DockItem::Tabs { items, .. } => items.clone(),
+                        _ => {
+                            unreachable!("Invalid DockItem type in DockItemInfo::Tabs")
+                        }
+                    })
+                    .collect_vec();
+
+                DockItem::tabs(items, Some(active_index), &dock_area, cx)
+            }
+            DockItemInfo::Panel(_) => {
+                let view = if let Some(f) = cx
+                    .global::<PanelRegistry>()
+                    .items
+                    .get(&self.panel_name)
+                    .cloned()
+                {
+                    f(dock_area.clone(), self, &info, cx)
+                } else {
+                    // Show an invalid panel if the panel is not registered.
+                    Box::new(
+                        cx.new_view(|cx| InvalidPanel::new(&self.panel_name, self.clone(), cx)),
+                    )
+                };
+
+                DockItem::tabs(vec![view.into()], None, &dock_area, cx)
+            }
+        }
+    }
+}

crates/ui/src/dock/tab_panel.rs

@@ -0,0 +1,888 @@
+use std::sync::Arc;
+
+use gpui::{
+    div, prelude::FluentBuilder, px, rems, AnchorCorner, AppContext, DefiniteLength, DismissEvent,
+    DragMoveEvent, Empty, Entity, EventEmitter, FocusHandle, FocusableView,
+    InteractiveElement as _, IntoElement, ParentElement, Pixels, Render, ScrollHandle,
+    SharedString, StatefulInteractiveElement, Styled, View, ViewContext, VisualContext as _,
+    WeakView, WindowContext,
+};
+
+use crate::{
+    button::{Button, ButtonVariants as _},
+    dock::DockItemInfo,
+    h_flex,
+    popup_menu::{PopupMenu, PopupMenuExt},
+    tab::{Tab, TabBar},
+    theme::ActiveTheme,
+    v_flex, AxisExt, IconName, Placement, Selectable, Sizable,
+};
+
+use super::{
+    ClosePanel, DockArea, DockItemState, DockPlacement, Panel, PanelEvent, PanelStyle, PanelView,
+    StackPanel, ToggleZoom,
+};
+
+#[derive(Clone, Copy)]
+struct TabState {
+    closeable: bool,
+    zoomable: bool,
+    draggable: bool,
+    droppable: bool,
+}
+
+#[derive(Clone)]
+pub(crate) struct DragPanel {
+    pub(crate) panel: Arc<dyn PanelView>,
+    pub(crate) tab_panel: View<TabPanel>,
+}
+
+impl DragPanel {
+    pub(crate) fn new(panel: Arc<dyn PanelView>, tab_panel: View<TabPanel>) -> Self {
+        Self { panel, tab_panel }
+    }
+}
+
+impl Render for DragPanel {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        div()
+            .id("drag-panel")
+            .cursor_grab()
+            .py_1()
+            .px_3()
+            .w_24()
+            .overflow_hidden()
+            .whitespace_nowrap()
+            .border_1()
+            .border_color(cx.theme().border)
+            .rounded_md()
+            .text_color(cx.theme().tab_foreground)
+            .bg(cx.theme().tab_active)
+            .opacity(0.75)
+            .child(self.panel.title(cx))
+    }
+}
+
+pub struct TabPanel {
+    focus_handle: FocusHandle,
+    dock_area: WeakView<DockArea>,
+    /// The stock_panel can be None, if is None, that means the panels can't be split or move
+    stack_panel: Option<WeakView<StackPanel>>,
+    pub(crate) panels: Vec<Arc<dyn PanelView>>,
+    pub(crate) active_ix: usize,
+    /// If this is true, the Panel closeable will follow the active panel's closeable,
+    /// otherwise this TabPanel will not able to close
+    pub(crate) closeable: bool,
+
+    tab_bar_scroll_handle: ScrollHandle,
+    is_zoomed: bool,
+    is_collapsed: bool,
+    /// When drag move, will get the placement of the panel to be split
+    will_split_placement: Option<Placement>,
+}
+
+impl Panel for TabPanel {
+    fn panel_name(&self) -> &'static str {
+        "TabPanel"
+    }
+
+    fn title(&self, cx: &WindowContext) -> gpui::AnyElement {
+        self.active_panel()
+            .map(|panel| panel.title(cx))
+            .unwrap_or("Empty Tab".into_any_element())
+    }
+
+    fn closeable(&self, cx: &WindowContext) -> bool {
+        if !self.closeable {
+            return false;
+        }
+
+        self.active_panel()
+            .map(|panel| panel.closeable(cx))
+            .unwrap_or(false)
+    }
+
+    fn zoomable(&self, cx: &WindowContext) -> bool {
+        self.active_panel()
+            .map(|panel| panel.zoomable(cx))
+            .unwrap_or(false)
+    }
+
+    fn popup_menu(&self, menu: PopupMenu, cx: &WindowContext) -> PopupMenu {
+        if let Some(panel) = self.active_panel() {
+            panel.popup_menu(menu, cx)
+        } else {
+            menu
+        }
+    }
+
+    fn toolbar_buttons(&self, cx: &WindowContext) -> Vec<Button> {
+        if let Some(panel) = self.active_panel() {
+            panel.toolbar_buttons(cx)
+        } else {
+            vec![]
+        }
+    }
+
+    fn dump(&self, cx: &AppContext) -> DockItemState {
+        let mut state = DockItemState::new(self);
+        for panel in self.panels.iter() {
+            state.add_child(panel.dump(cx));
+            state.info = DockItemInfo::tabs(self.active_ix);
+        }
+        state
+    }
+}
+
+impl TabPanel {
+    pub fn new(
+        stack_panel: Option<WeakView<StackPanel>>,
+        dock_area: WeakView<DockArea>,
+        cx: &mut ViewContext<Self>,
+    ) -> Self {
+        Self {
+            focus_handle: cx.focus_handle(),
+            dock_area,
+            stack_panel,
+            panels: Vec::new(),
+            active_ix: 0,
+            tab_bar_scroll_handle: ScrollHandle::new(),
+            will_split_placement: None,
+            is_zoomed: false,
+            is_collapsed: false,
+            closeable: true,
+        }
+    }
+
+    pub(super) fn set_parent(&mut self, view: WeakView<StackPanel>) {
+        self.stack_panel = Some(view);
+    }
+
+    /// Return current active_panel View
+    pub fn active_panel(&self) -> Option<Arc<dyn PanelView>> {
+        self.panels.get(self.active_ix).cloned()
+    }
+
+    fn set_active_ix(&mut self, ix: usize, cx: &mut ViewContext<Self>) {
+        self.active_ix = ix;
+        self.tab_bar_scroll_handle.scroll_to_item(ix);
+        self.focus_active_panel(cx);
+        cx.emit(PanelEvent::LayoutChanged);
+        cx.notify();
+    }
+
+    /// Add a panel to the end of the tabs
+    pub fn add_panel(&mut self, panel: Arc<dyn PanelView>, cx: &mut ViewContext<Self>) {
+        assert_ne!(
+            panel.panel_name(cx),
+            "StackPanel",
+            "can not allows add `StackPanel` to `TabPanel`"
+        );
+
+        if self
+            .panels
+            .iter()
+            .any(|p| p.view().entity_id() == panel.view().entity_id())
+        {
+            return;
+        }
+
+        self.panels.push(panel);
+        // set the active panel to the new panel
+        self.set_active_ix(self.panels.len() - 1, cx);
+        cx.emit(PanelEvent::LayoutChanged);
+        cx.notify();
+    }
+
+    /// Add panel to try to split
+    pub fn add_panel_at(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        placement: Placement,
+        size: Option<Pixels>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        cx.spawn(|view, mut cx| async move {
+            cx.update(|cx| {
+                view.update(cx, |view, cx| {
+                    view.will_split_placement = Some(placement);
+                    view.split_panel(panel, placement, size, cx)
+                })
+                .ok()
+            })
+            .ok()
+        })
+        .detach();
+        cx.emit(PanelEvent::LayoutChanged);
+        cx.notify();
+    }
+
+    fn insert_panel_at(
+        &mut self,
+        panel: Arc<dyn PanelView>,
+        ix: usize,
+        cx: &mut ViewContext<Self>,
+    ) {
+        if self
+            .panels
+            .iter()
+            .any(|p| p.view().entity_id() == panel.view().entity_id())
+        {
+            return;
+        }
+
+        self.panels.insert(ix, panel);
+        self.set_active_ix(ix, cx);
+        cx.emit(PanelEvent::LayoutChanged);
+        cx.notify();
+    }
+
+    /// Remove a panel from the tab panel
+    pub fn remove_panel(&mut self, panel: Arc<dyn PanelView>, cx: &mut ViewContext<Self>) {
+        self.detach_panel(panel, cx);
+        self.remove_self_if_empty(cx);
+        cx.emit(PanelEvent::ZoomOut);
+        cx.emit(PanelEvent::LayoutChanged);
+    }
+
+    fn detach_panel(&mut self, panel: Arc<dyn PanelView>, cx: &mut ViewContext<Self>) {
+        let panel_view = panel.view();
+        self.panels.retain(|p| p.view() != panel_view);
+        if self.active_ix >= self.panels.len() {
+            self.set_active_ix(self.panels.len().saturating_sub(1), cx)
+        }
+    }
+
+    /// Check to remove self from the parent StackPanel, if there is no panel left
+    fn remove_self_if_empty(&self, cx: &mut ViewContext<Self>) {
+        if !self.panels.is_empty() {
+            return;
+        }
+
+        let tab_view = cx.view().clone();
+        if let Some(stack_panel) = self.stack_panel.as_ref() {
+            _ = stack_panel.update(cx, |view, cx| {
+                view.remove_panel(Arc::new(tab_view), cx);
+            });
+        }
+    }
+
+    pub(super) fn set_collapsed(&mut self, collapsed: bool, cx: &mut ViewContext<Self>) {
+        self.is_collapsed = collapsed;
+        cx.notify();
+    }
+
+    fn is_locked(&self, cx: &AppContext) -> bool {
+        let Some(dock_area) = self.dock_area.upgrade() else {
+            return true;
+        };
+
+        if dock_area.read(cx).is_locked() {
+            return true;
+        }
+
+        if self.is_zoomed {
+            return true;
+        }
+
+        self.stack_panel.is_none()
+    }
+
+    /// Return true if self or parent only have last panel.
+    fn is_last_panel(&self, cx: &AppContext) -> bool {
+        if let Some(parent) = &self.stack_panel {
+            if let Some(stack_panel) = parent.upgrade() {
+                if !stack_panel.read(cx).is_last_panel(cx) {
+                    return false;
+                }
+            }
+        }
+
+        self.panels.len() <= 1
+    }
+
+    /// Return true if the tab panel is draggable.
+    ///
+    /// E.g. if the parent and self only have one panel, it is not draggable.
+    fn draggable(&self, cx: &AppContext) -> bool {
+        !self.is_locked(cx) && !self.is_last_panel(cx)
+    }
+
+    /// Return true if the tab panel is droppable.
+    ///
+    /// E.g. if the tab panel is locked, it is not droppable.
+    fn droppable(&self, cx: &AppContext) -> bool {
+        !self.is_locked(cx)
+    }
+
+    fn render_toolbar(&self, state: TabState, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let is_zoomed = self.is_zoomed && state.zoomable;
+        let view = cx.view().clone();
+        let build_popup_menu = move |this, cx: &WindowContext| view.read(cx).popup_menu(this, cx);
+
+        // TODO: Do not show MenuButton if there is no menu items
+
+        h_flex()
+            .gap_2()
+            .occlude()
+            .items_center()
+            .children(
+                self.toolbar_buttons(cx)
+                    .into_iter()
+                    .map(|btn| btn.xsmall().ghost()),
+            )
+            .when(self.is_zoomed, |this| {
+                this.child(
+                    Button::new("zoom")
+                        .icon(IconName::Minimize)
+                        .xsmall()
+                        .ghost()
+                        .tooltip("Zoom Out")
+                        .on_click(
+                            cx.listener(|view, _, cx| view.on_action_toggle_zoom(&ToggleZoom, cx)),
+                        ),
+                )
+            })
+            .child(
+                Button::new("menu")
+                    .icon(IconName::Ellipsis)
+                    .xsmall()
+                    .ghost()
+                    .popup_menu(move |this, cx| {
+                        build_popup_menu(this, cx)
+                            .when(state.zoomable, |this| {
+                                let name = if is_zoomed { "Zoom Out" } else { "Zoom In" };
+                                this.separator().menu(name, Box::new(ToggleZoom))
+                            })
+                            .when(state.closeable, |this| {
+                                this.separator().menu("Close", Box::new(ClosePanel))
+                            })
+                    })
+                    .anchor(AnchorCorner::TopRight),
+            )
+    }
+
+    fn render_dock_toggle_button(
+        &self,
+        placement: DockPlacement,
+        cx: &mut ViewContext<Self>,
+    ) -> Option<impl IntoElement> {
+        if self.is_zoomed {
+            return None;
+        }
+
+        let dock_area = self.dock_area.upgrade()?.read(cx);
+        if !dock_area.is_dock_collapsible(placement, cx) {
+            return None;
+        }
+
+        let view_entity_id = cx.view().entity_id();
+        let toggle_button_panels = dock_area.toggle_button_panels;
+
+        // Check if current TabPanel's entity_id matches the one stored in DockArea for this placement
+        if !match placement {
+            DockPlacement::Left => {
+                dock_area.left_dock.is_some() && toggle_button_panels.left == Some(view_entity_id)
+            }
+            DockPlacement::Right => {
+                dock_area.right_dock.is_some() && toggle_button_panels.right == Some(view_entity_id)
+            }
+            DockPlacement::Bottom => {
+                dock_area.bottom_dock.is_some()
+                    && toggle_button_panels.bottom == Some(view_entity_id)
+            }
+            DockPlacement::Center => unreachable!(),
+        } {
+            return None;
+        }
+
+        let is_open = dock_area.is_dock_open(placement, cx);
+
+        let icon = match placement {
+            DockPlacement::Left => {
+                if is_open {
+                    IconName::PanelLeft
+                } else {
+                    IconName::PanelLeftOpen
+                }
+            }
+            DockPlacement::Right => {
+                if is_open {
+                    IconName::PanelRight
+                } else {
+                    IconName::PanelRightOpen
+                }
+            }
+            DockPlacement::Bottom => {
+                if is_open {
+                    IconName::PanelBottom
+                } else {
+                    IconName::PanelBottomOpen
+                }
+            }
+            DockPlacement::Center => unreachable!(),
+        };
+
+        Some(
+            Button::new(SharedString::from(format!("toggle-dock:{:?}", placement)))
+                .icon(icon)
+                .xsmall()
+                .ghost()
+                .tooltip(match is_open {
+                    true => "Collapse",
+                    false => "Expand",
+                })
+                .on_click(cx.listener({
+                    let dock_area = self.dock_area.clone();
+                    move |_, _, cx| {
+                        _ = dock_area.update(cx, |dock_area, cx| {
+                            dock_area.toggle_dock(placement, cx);
+                        });
+                    }
+                })),
+        )
+    }
+
+    fn render_title_bar(&self, state: TabState, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let view = cx.view().clone();
+
+        let Some(dock_area) = self.dock_area.upgrade() else {
+            return div().into_any_element();
+        };
+        let panel_style = dock_area.read(cx).panel_style;
+
+        let left_dock_button = self.render_dock_toggle_button(DockPlacement::Left, cx);
+        let bottom_dock_button = self.render_dock_toggle_button(DockPlacement::Bottom, cx);
+        let right_dock_button = self.render_dock_toggle_button(DockPlacement::Right, cx);
+
+        if self.panels.len() == 1 && panel_style == PanelStyle::Default {
+            let panel = self.panels.get(0).unwrap();
+            let title_style = panel.title_style(cx);
+
+            return h_flex()
+                .justify_between()
+                .items_center()
+                .line_height(rems(1.0))
+                .h(px(30.))
+                .py_2()
+                .px_3()
+                .when(left_dock_button.is_some(), |this| this.pl_2())
+                .when(right_dock_button.is_some(), |this| this.pr_2())
+                .when_some(title_style, |this, theme| {
+                    this.bg(theme.background).text_color(theme.foreground)
+                })
+                .when(
+                    left_dock_button.is_some() || bottom_dock_button.is_some(),
+                    |this| {
+                        this.child(
+                            h_flex()
+                                .flex_shrink_0()
+                                .mr_1()
+                                .gap_1()
+                                .children(left_dock_button)
+                                .children(bottom_dock_button),
+                        )
+                    },
+                )
+                .child(
+                    div()
+                        .id("tab")
+                        .flex_1()
+                        .min_w_16()
+                        .overflow_hidden()
+                        .text_ellipsis()
+                        .whitespace_nowrap()
+                        .child(panel.title(cx))
+                        .when(state.draggable, |this| {
+                            this.on_drag(
+                                DragPanel {
+                                    panel: panel.clone(),
+                                    tab_panel: view,
+                                },
+                                |drag, _, cx| {
+                                    cx.stop_propagation();
+                                    cx.new_view(|_| drag.clone())
+                                },
+                            )
+                        }),
+                )
+                .child(
+                    h_flex()
+                        .flex_shrink_0()
+                        .ml_1()
+                        .gap_1()
+                        .child(self.render_toolbar(state, cx))
+                        .children(right_dock_button),
+                )
+                .into_any_element();
+        }
+
+        let tabs_count = self.panels.len();
+
+        TabBar::new("tab-bar")
+            .track_scroll(self.tab_bar_scroll_handle.clone())
+            .when(
+                left_dock_button.is_some() || bottom_dock_button.is_some(),
+                |this| {
+                    this.prefix(
+                        h_flex()
+                            .items_center()
+                            .top_0()
+                            // Right -1 for avoid border overlap with the first tab
+                            .right(-px(1.))
+                            .border_r_1()
+                            .border_b_1()
+                            .h_full()
+                            .border_color(cx.theme().border)
+                            .bg(cx.theme().tab_bar)
+                            .px_2()
+                            .children(left_dock_button)
+                            .children(bottom_dock_button),
+                    )
+                },
+            )
+            .children(self.panels.iter().enumerate().map(|(ix, panel)| {
+                let mut active = ix == self.active_ix;
+
+                // Always not show active tab style, if the panel is collapsed
+                if self.is_collapsed {
+                    active = false;
+                }
+
+                Tab::new(("tab", ix), panel.title(cx))
+                    .py_2()
+                    .selected(active)
+                    .on_click(cx.listener(move |view, _, cx| {
+                        view.set_active_ix(ix, cx);
+                    }))
+                    .when(state.draggable, |this| {
+                        this.on_drag(
+                            DragPanel::new(panel.clone(), view.clone()),
+                            |drag, _, cx| {
+                                cx.stop_propagation();
+                                cx.new_view(|_| drag.clone())
+                            },
+                        )
+                    })
+                    .when(state.droppable, |this| {
+                        this.drag_over::<DragPanel>(|this, _, cx| {
+                            this.rounded_l_none()
+                                .border_l_2()
+                                .border_r_0()
+                                .border_color(cx.theme().drag_border)
+                        })
+                        .on_drop(cx.listener(
+                            move |this, drag: &DragPanel, cx| {
+                                this.will_split_placement = None;
+                                this.on_drop(drag, Some(ix), cx)
+                            },
+                        ))
+                    })
+            }))
+            .child(
+                // empty space to allow move to last tab right
+                div()
+                    .id("tab-bar-empty-space")
+                    .h_full()
+                    .flex_grow()
+                    .min_w_16()
+                    .when(state.droppable, |this| {
+                        this.drag_over::<DragPanel>(|this, _, cx| this.bg(cx.theme().drop_target))
+                            .on_drop(cx.listener(move |this, drag: &DragPanel, cx| {
+                                this.will_split_placement = None;
+
+                                let ix = if drag.tab_panel == view {
+                                    Some(tabs_count - 1)
+                                } else {
+                                    None
+                                };
+
+                                this.on_drop(drag, ix, cx)
+                            }))
+                    }),
+            )
+            .suffix(
+                h_flex()
+                    .items_center()
+                    .top_0()
+                    .right_0()
+                    .border_l_1()
+                    .border_b_1()
+                    .h_full()
+                    .border_color(cx.theme().border)
+                    .bg(cx.theme().tab_bar)
+                    .px_2()
+                    .gap_1()
+                    .child(self.render_toolbar(state, cx))
+                    .when_some(right_dock_button, |this, btn| this.child(btn)),
+            )
+            .into_any_element()
+    }
+
+    fn render_active_panel(&self, state: TabState, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        self.active_panel()
+            .map(|panel| {
+                div()
+                    .id("tab-content")
+                    .group("")
+                    .overflow_y_scroll()
+                    .overflow_x_hidden()
+                    .flex_1()
+                    .child(panel.view())
+                    .when(state.droppable, |this| {
+                        this.on_drag_move(cx.listener(Self::on_panel_drag_move))
+                            .child(
+                                div()
+                                    .invisible()
+                                    .absolute()
+                                    .bg(cx.theme().drop_target)
+                                    .map(|this| match self.will_split_placement {
+                                        Some(placement) => {
+                                            let size = DefiniteLength::Fraction(0.35);
+                                            match placement {
+                                                Placement::Left => {
+                                                    this.left_0().top_0().bottom_0().w(size)
+                                                }
+                                                Placement::Right => {
+                                                    this.right_0().top_0().bottom_0().w(size)
+                                                }
+                                                Placement::Top => {
+                                                    this.top_0().left_0().right_0().h(size)
+                                                }
+                                                Placement::Bottom => {
+                                                    this.bottom_0().left_0().right_0().h(size)
+                                                }
+                                            }
+                                        }
+                                        None => this.top_0().left_0().size_full(),
+                                    })
+                                    .group_drag_over::<DragPanel>("", |this| this.visible())
+                                    .on_drop(cx.listener(|this, drag: &DragPanel, cx| {
+                                        this.on_drop(drag, None, cx)
+                                    })),
+                            )
+                    })
+                    .into_any_element()
+            })
+            .unwrap_or(Empty {}.into_any_element())
+    }
+
+    /// Calculate the split direction based on the current mouse position
+    fn on_panel_drag_move(&mut self, drag: &DragMoveEvent<DragPanel>, cx: &mut ViewContext<Self>) {
+        let bounds = drag.bounds;
+        let position = drag.event.position;
+
+        // Check the mouse position to determine the split direction
+        if position.x < bounds.left() + bounds.size.width * 0.35 {
+            self.will_split_placement = Some(Placement::Left);
+        } else if position.x > bounds.left() + bounds.size.width * 0.65 {
+            self.will_split_placement = Some(Placement::Right);
+        } else if position.y < bounds.top() + bounds.size.height * 0.35 {
+            self.will_split_placement = Some(Placement::Top);
+        } else if position.y > bounds.top() + bounds.size.height * 0.65 {
+            self.will_split_placement = Some(Placement::Bottom);
+        } else {
+            // center to merge into the current tab
+            self.will_split_placement = None;
+        }
+        cx.notify()
+    }
+
+    fn on_drop(&mut self, drag: &DragPanel, ix: Option<usize>, cx: &mut ViewContext<Self>) {
+        let panel = drag.panel.clone();
+        let is_same_tab = drag.tab_panel == *cx.view();
+
+        // If target is same tab, and it is only one panel, do nothing.
+        if is_same_tab && ix.is_none() {
+            if self.will_split_placement.is_none() {
+                return;
+            } else if self.panels.len() == 1 {
+                return;
+            }
+        }
+
+        // Here is looks like remove_panel on a same item, but it difference.
+        //
+        // We must to split it to remove_panel, unless it will be crash by error:
+        // Cannot update ui::dock::tab_panel::TabPanel while it is already being updated
+        if is_same_tab {
+            self.detach_panel(panel.clone(), cx);
+        } else {
+            let _ = drag.tab_panel.update(cx, |view, cx| {
+                view.detach_panel(panel.clone(), cx);
+                view.remove_self_if_empty(cx);
+            });
+        }
+
+        // Insert into new tabs
+        if let Some(placement) = self.will_split_placement {
+            self.split_panel(panel, placement, None, cx);
+        } else if let Some(ix) = ix {
+            self.insert_panel_at(panel, ix, cx)
+        } else {
+            self.add_panel(panel, cx)
+        }
+
+        self.remove_self_if_empty(cx);
+        cx.emit(PanelEvent::LayoutChanged);
+    }
+
+    /// Add panel with split placement
+    fn split_panel(
+        &self,
+        panel: Arc<dyn PanelView>,
+        placement: Placement,
+        size: Option<Pixels>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        let dock_area = self.dock_area.clone();
+        // wrap the panel in a TabPanel
+        let new_tab_panel = cx.new_view(|cx| Self::new(None, dock_area.clone(), cx));
+        new_tab_panel.update(cx, |view, cx| {
+            view.add_panel(panel, cx);
+        });
+
+        let stack_panel = match self.stack_panel.as_ref().and_then(|panel| panel.upgrade()) {
+            Some(panel) => panel,
+            None => return,
+        };
+
+        let parent_axis = stack_panel.read(cx).axis;
+
+        let ix = stack_panel
+            .read(cx)
+            .index_of_panel(Arc::new(cx.view().clone()))
+            .unwrap_or_default();
+
+        if parent_axis.is_vertical() && placement.is_vertical() {
+            stack_panel.update(cx, |view, cx| {
+                view.insert_panel_at(
+                    Arc::new(new_tab_panel),
+                    ix,
+                    placement,
+                    size,
+                    dock_area.clone(),
+                    cx,
+                );
+            });
+        } else if parent_axis.is_horizontal() && placement.is_horizontal() {
+            stack_panel.update(cx, |view, cx| {
+                view.insert_panel_at(
+                    Arc::new(new_tab_panel),
+                    ix,
+                    placement,
+                    size,
+                    dock_area.clone(),
+                    cx,
+                );
+            });
+        } else {
+            // 1. Create new StackPanel with new axis
+            // 2. Move cx.view() from parent StackPanel to the new StackPanel
+            // 3. Add the new TabPanel to the new StackPanel at the correct index
+            // 4. Add new StackPanel to the parent StackPanel at the correct index
+            let tab_panel = cx.view().clone();
+
+            // Try to use the old stack panel, not just create a new one, to avoid too many nested stack panels
+            let new_stack_panel = if stack_panel.read(cx).panels_len() <= 1 {
+                stack_panel.update(cx, |view, cx| {
+                    view.remove_all_panels(cx);
+                    view.set_axis(placement.axis(), cx);
+                });
+                stack_panel.clone()
+            } else {
+                cx.new_view(|cx| {
+                    let mut panel = StackPanel::new(placement.axis(), cx);
+                    panel.parent = Some(stack_panel.downgrade());
+                    panel
+                })
+            };
+
+            new_stack_panel.update(cx, |view, cx| match placement {
+                Placement::Left | Placement::Top => {
+                    view.add_panel(Arc::new(new_tab_panel), size, dock_area.clone(), cx);
+                    view.add_panel(Arc::new(tab_panel.clone()), None, dock_area.clone(), cx);
+                }
+                Placement::Right | Placement::Bottom => {
+                    view.add_panel(Arc::new(tab_panel.clone()), None, dock_area.clone(), cx);
+                    view.add_panel(Arc::new(new_tab_panel), size, dock_area.clone(), cx);
+                }
+            });
+
+            if stack_panel != new_stack_panel {
+                stack_panel.update(cx, |view, cx| {
+                    view.replace_panel(Arc::new(tab_panel.clone()), new_stack_panel.clone(), cx);
+                });
+            }
+
+            cx.spawn(|_, mut cx| async move {
+                cx.update(|cx| tab_panel.update(cx, |view, cx| view.remove_self_if_empty(cx)))
+            })
+            .detach()
+        }
+
+        cx.emit(PanelEvent::LayoutChanged);
+    }
+
+    fn focus_active_panel(&self, cx: &mut ViewContext<Self>) {
+        if let Some(active_panel) = self.active_panel() {
+            active_panel.focus_handle(cx).focus(cx);
+        }
+    }
+
+    fn on_action_toggle_zoom(&mut self, _: &ToggleZoom, cx: &mut ViewContext<Self>) {
+        if !self.zoomable(cx) {
+            return;
+        }
+
+        if !self.is_zoomed {
+            cx.emit(PanelEvent::ZoomIn)
+        } else {
+            cx.emit(PanelEvent::ZoomOut)
+        }
+        self.is_zoomed = !self.is_zoomed;
+    }
+
+    fn on_action_close_panel(&mut self, _: &ClosePanel, cx: &mut ViewContext<Self>) {
+        if let Some(panel) = self.active_panel() {
+            self.remove_panel(panel, cx);
+        }
+    }
+}
+
+impl FocusableView for TabPanel {
+    fn focus_handle(&self, cx: &AppContext) -> gpui::FocusHandle {
+        if let Some(active_panel) = self.active_panel() {
+            active_panel.focus_handle(cx)
+        } else {
+            self.focus_handle.clone()
+        }
+    }
+}
+impl EventEmitter<DismissEvent> for TabPanel {}
+impl EventEmitter<PanelEvent> for TabPanel {}
+impl Render for TabPanel {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl gpui::IntoElement {
+        let focus_handle = self.focus_handle(cx);
+        let mut state = TabState {
+            closeable: self.closeable(cx),
+            draggable: self.draggable(cx),
+            droppable: self.droppable(cx),
+            zoomable: self.zoomable(cx),
+        };
+        if !state.draggable {
+            state.closeable = false;
+        }
+
+        v_flex()
+            .id("tab-panel")
+            .track_focus(&focus_handle)
+            .on_action(cx.listener(Self::on_action_toggle_zoom))
+            .on_action(cx.listener(Self::on_action_close_panel))
+            .size_full()
+            .overflow_hidden()
+            .bg(cx.theme().background)
+            .child(self.render_title_bar(state, cx))
+            .child(self.render_active_panel(state, cx))
+    }
+}

crates/ui/src/drawer.rs

@@ -0,0 +1,244 @@
+use std::{rc::Rc, time::Duration};
+
+use gpui::{
+    actions, anchored, div, point, prelude::FluentBuilder as _, px, Animation, AnimationExt as _,
+    AnyElement, AppContext, ClickEvent, DefiniteLength, DismissEvent, Div, EventEmitter,
+    FocusHandle, InteractiveElement as _, IntoElement, KeyBinding, MouseButton, ParentElement,
+    Pixels, RenderOnce, Styled, WindowContext,
+};
+
+use crate::{
+    button::{Button, ButtonVariants as _},
+    h_flex,
+    modal::overlay_color,
+    root::ContextModal as _,
+    scroll::ScrollbarAxis,
+    theme::ActiveTheme,
+    title_bar::TITLE_BAR_HEIGHT,
+    v_flex, IconName, Placement, Sizable, StyledExt as _,
+};
+
+actions!(drawer, [Escape]);
+
+const CONTEXT: &str = "Drawer";
+pub fn init(cx: &mut AppContext) {
+    cx.bind_keys([KeyBinding::new("escape", Escape, Some(CONTEXT))])
+}
+
+#[derive(IntoElement)]
+pub struct Drawer {
+    pub(crate) focus_handle: FocusHandle,
+    placement: Placement,
+    size: DefiniteLength,
+    resizable: bool,
+    on_close: Rc<dyn Fn(&ClickEvent, &mut WindowContext) + 'static>,
+    title: Option<AnyElement>,
+    footer: Option<AnyElement>,
+    content: Div,
+    margin_top: Pixels,
+    overlay: bool,
+}
+
+impl Drawer {
+    pub fn new(cx: &mut WindowContext) -> Self {
+        Self {
+            focus_handle: cx.focus_handle(),
+            placement: Placement::Right,
+            size: DefiniteLength::Absolute(px(350.).into()),
+            resizable: true,
+            title: None,
+            footer: None,
+            content: v_flex().px_4().py_3(),
+            margin_top: TITLE_BAR_HEIGHT,
+            overlay: true,
+            on_close: Rc::new(|_, _| {}),
+        }
+    }
+
+    /// Sets the title of the drawer.
+    pub fn title(mut self, title: impl IntoElement) -> Self {
+        self.title = Some(title.into_any_element());
+        self
+    }
+
+    /// Set the footer of the drawer.
+    pub fn footer(mut self, footer: impl IntoElement) -> Self {
+        self.footer = Some(footer.into_any_element());
+        self
+    }
+
+    /// Sets the size of the drawer, default is 350px.
+    pub fn size(mut self, size: impl Into<DefiniteLength>) -> Self {
+        self.size = size.into();
+        self
+    }
+
+    /// Sets the margin top of the drawer, default is 0px.
+    ///
+    /// This is used to let Drawer be placed below a Windows Title, you can give the height of the title bar.
+    pub fn margin_top(mut self, top: Pixels) -> Self {
+        self.margin_top = top;
+        self
+    }
+
+    /// Sets the placement of the drawer, default is `Placement::Right`.
+    pub fn placement(mut self, placement: Placement) -> Self {
+        self.placement = placement;
+        self
+    }
+
+    /// Sets the placement of the drawer, default is `Placement::Right`.
+    pub fn set_placement(&mut self, placement: Placement) {
+        self.placement = placement;
+    }
+
+    /// Sets whether the drawer is resizable, default is `true`.
+    pub fn resizable(mut self, resizable: bool) -> Self {
+        self.resizable = resizable;
+        self
+    }
+
+    /// Set whether the drawer should have an overlay, default is `true`.
+    pub fn overlay(mut self, overlay: bool) -> Self {
+        self.overlay = overlay;
+        self
+    }
+
+    /// Listen to the close event of the drawer.
+    pub fn on_close(
+        mut self,
+        on_close: impl Fn(&ClickEvent, &mut WindowContext) + 'static,
+    ) -> Self {
+        self.on_close = Rc::new(on_close);
+        self
+    }
+}
+
+impl EventEmitter<DismissEvent> for Drawer {}
+impl ParentElement for Drawer {
+    fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
+        self.content.extend(elements);
+    }
+}
+impl Styled for Drawer {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.content.style()
+    }
+}
+
+impl RenderOnce for Drawer {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let placement = self.placement;
+        let titlebar_height = self.margin_top;
+        let size = cx.viewport_size();
+        let on_close = self.on_close.clone();
+
+        anchored()
+            .position(point(px(0.), titlebar_height))
+            .snap_to_window()
+            .child(
+                div()
+                    .occlude()
+                    .w(size.width)
+                    .h(size.height - titlebar_height)
+                    .bg(overlay_color(self.overlay, cx))
+                    .when(self.overlay, |this| {
+                        this.on_mouse_down(MouseButton::Left, {
+                            let on_close = self.on_close.clone();
+                            move |_, cx| {
+                                on_close(&ClickEvent::default(), cx);
+                                cx.close_drawer();
+                            }
+                        })
+                    })
+                    .child(
+                        v_flex()
+                            .id("drawer")
+                            .key_context(CONTEXT)
+                            .track_focus(&self.focus_handle)
+                            .on_action({
+                                let on_close = self.on_close.clone();
+                                move |_: &Escape, cx| {
+                                    on_close(&ClickEvent::default(), cx);
+                                    cx.close_drawer();
+                                }
+                            })
+                            .absolute()
+                            .occlude()
+                            .bg(cx.theme().background)
+                            .border_color(cx.theme().border)
+                            .shadow_xl()
+                            .map(|this| {
+                                // Set the size of the drawer.
+                                if placement.is_horizontal() {
+                                    this.h_full().w(self.size)
+                                } else {
+                                    this.w_full().h(self.size)
+                                }
+                            })
+                            .map(|this| match self.placement {
+                                Placement::Top => this.top_0().left_0().right_0().border_b_1(),
+                                Placement::Right => this.top_0().right_0().bottom_0().border_l_1(),
+                                Placement::Bottom => {
+                                    this.bottom_0().left_0().right_0().border_t_1()
+                                }
+                                Placement::Left => this.top_0().left_0().bottom_0().border_r_1(),
+                            })
+                            .child(
+                                // TitleBar
+                                h_flex()
+                                    .justify_between()
+                                    .px_4()
+                                    .py_2()
+                                    .w_full()
+                                    .child(self.title.unwrap_or(div().into_any_element()))
+                                    .child(
+                                        Button::new("close")
+                                            .small()
+                                            .ghost()
+                                            .icon(IconName::Close)
+                                            .on_click(move |_, cx| {
+                                                on_close(&ClickEvent::default(), cx);
+                                                cx.close_drawer();
+                                            }),
+                                    ),
+                            )
+                            .child(
+                                // Body
+                                div().flex_1().overflow_hidden().child(
+                                    v_flex()
+                                        .scrollable(
+                                            cx.parent_view_id().unwrap_or_default(),
+                                            ScrollbarAxis::Vertical,
+                                        )
+                                        .child(self.content),
+                                ),
+                            )
+                            .when_some(self.footer, |this, footer| {
+                                // Footer
+                                this.child(
+                                    h_flex()
+                                        .justify_between()
+                                        .px_4()
+                                        .py_3()
+                                        .w_full()
+                                        .child(footer),
+                                )
+                            })
+                            .with_animation(
+                                "slide",
+                                Animation::new(Duration::from_secs_f64(0.15)),
+                                move |this, delta| {
+                                    let y = px(-100.) + delta * px(100.);
+                                    this.map(|this| match placement {
+                                        Placement::Top => this.top(y),
+                                        Placement::Right => this.right(y),
+                                        Placement::Bottom => this.bottom(y),
+                                        Placement::Left => this.left(y),
+                                    })
+                                },
+                            ),
+                    ),
+            )
+    }
+}

crates/ui/src/dropdown.rs

@@ -0,0 +1,713 @@
+use gpui::{
+    actions, anchored, canvas, deferred, div, prelude::FluentBuilder, px, rems, AnyElement,
+    AppContext, Bounds, ClickEvent, DismissEvent, ElementId, EventEmitter, FocusHandle,
+    FocusableView, InteractiveElement, IntoElement, KeyBinding, Length, ParentElement, Pixels,
+    Render, SharedString, StatefulInteractiveElement, Styled, Task, View, ViewContext,
+    VisualContext, WeakView, WindowContext,
+};
+
+use crate::{
+    h_flex,
+    input::ClearButton,
+    list::{self, List, ListDelegate, ListItem},
+    theme::ActiveTheme,
+    v_flex, Disableable, Icon, IconName, Sizable, Size, StyleSized, StyledExt,
+};
+
+actions!(dropdown, [Up, Down, Enter, Escape]);
+
+const CONTEXT: &str = "Dropdown";
+pub fn init(cx: &mut AppContext) {
+    cx.bind_keys([
+        KeyBinding::new("up", Up, Some(CONTEXT)),
+        KeyBinding::new("down", Down, Some(CONTEXT)),
+        KeyBinding::new("enter", Enter, Some(CONTEXT)),
+        KeyBinding::new("escape", Escape, Some(CONTEXT)),
+    ])
+}
+
+/// A trait for items that can be displayed in a dropdown.
+pub trait DropdownItem {
+    type Value: Clone;
+    fn title(&self) -> SharedString;
+    fn value(&self) -> &Self::Value;
+}
+
+impl DropdownItem for String {
+    type Value = Self;
+
+    fn title(&self) -> SharedString {
+        SharedString::from(self.to_string())
+    }
+
+    fn value(&self) -> &Self::Value {
+        &self
+    }
+}
+
+impl DropdownItem for SharedString {
+    type Value = Self;
+
+    fn title(&self) -> SharedString {
+        SharedString::from(self.to_string())
+    }
+
+    fn value(&self) -> &Self::Value {
+        &self
+    }
+}
+
+pub trait DropdownDelegate: Sized {
+    type Item: DropdownItem;
+
+    fn len(&self) -> usize;
+
+    fn is_empty(&self) -> bool {
+        self.len() == 0
+    }
+
+    fn get(&self, ix: usize) -> Option<&Self::Item>;
+
+    fn position<V>(&self, value: &V) -> Option<usize>
+    where
+        Self::Item: DropdownItem<Value = V>,
+        V: PartialEq,
+    {
+        (0..self.len()).find(|&i| self.get(i).map_or(false, |item| item.value() == value))
+    }
+
+    fn can_search(&self) -> bool {
+        false
+    }
+
+    fn perform_search(&mut self, _query: &str, _cx: &mut ViewContext<Dropdown<Self>>) -> Task<()> {
+        Task::Ready(Some(()))
+    }
+}
+
+impl<T: DropdownItem> DropdownDelegate for Vec<T> {
+    type Item = T;
+
+    fn len(&self) -> usize {
+        self.len()
+    }
+
+    fn get(&self, ix: usize) -> Option<&Self::Item> {
+        self.as_slice().get(ix)
+    }
+
+    fn position<V>(&self, value: &V) -> Option<usize>
+    where
+        Self::Item: DropdownItem<Value = V>,
+        V: PartialEq,
+    {
+        self.iter().position(|v| v.value() == value)
+    }
+}
+
+struct DropdownListDelegate<D: DropdownDelegate + 'static> {
+    delegate: D,
+    dropdown: WeakView<Dropdown<D>>,
+    selected_index: Option<usize>,
+}
+
+impl<D> ListDelegate for DropdownListDelegate<D>
+where
+    D: DropdownDelegate + 'static,
+{
+    type Item = ListItem;
+
+    fn items_count(&self, _: &AppContext) -> usize {
+        self.delegate.len()
+    }
+
+    fn confirmed_index(&self, _: &AppContext) -> Option<usize> {
+        self.selected_index
+    }
+
+    fn render_item(&self, ix: usize, cx: &mut gpui::ViewContext<List<Self>>) -> Option<Self::Item> {
+        let selected = self
+            .selected_index
+            .map_or(false, |selected_index| selected_index == ix);
+        let size = self
+            .dropdown
+            .upgrade()
+            .map_or(Size::Medium, |dropdown| dropdown.read(cx).size);
+
+        if let Some(item) = self.delegate.get(ix) {
+            let list_item = ListItem::new(("list-item", ix))
+                .check_icon(IconName::Check)
+                .cursor_pointer()
+                .selected(selected)
+                .input_text_size(size)
+                .list_size(size)
+                .child(div().whitespace_nowrap().child(item.title().to_string()));
+            Some(list_item)
+        } else {
+            None
+        }
+    }
+
+    fn cancel(&mut self, cx: &mut ViewContext<List<Self>>) {
+        let dropdown = self.dropdown.clone();
+        cx.defer(move |_, cx| {
+            _ = dropdown.update(cx, |this, cx| {
+                this.open = false;
+                this.focus(cx);
+            });
+        });
+    }
+
+    fn confirm(&mut self, ix: Option<usize>, cx: &mut ViewContext<List<Self>>) {
+        self.selected_index = ix;
+
+        let selected_value = self
+            .selected_index
+            .and_then(|ix| self.delegate.get(ix))
+            .map(|item| item.value().clone());
+        let dropdown = self.dropdown.clone();
+
+        cx.defer(move |_, cx| {
+            _ = dropdown.update(cx, |this, cx| {
+                cx.emit(DropdownEvent::Confirm(selected_value.clone()));
+                this.selected_value = selected_value;
+                this.open = false;
+                this.focus(cx);
+            });
+        });
+    }
+
+    fn perform_search(&mut self, query: &str, cx: &mut ViewContext<List<Self>>) -> Task<()> {
+        self.dropdown
+            .upgrade()
+            .map_or(Task::Ready(None), |dropdown| {
+                dropdown.update(cx, |_, cx| self.delegate.perform_search(query, cx))
+            })
+    }
+
+    fn set_selected_index(&mut self, ix: Option<usize>, _: &mut ViewContext<List<Self>>) {
+        self.selected_index = ix;
+    }
+
+    fn render_empty(&self, cx: &mut ViewContext<List<Self>>) -> impl IntoElement {
+        if let Some(empty) = self
+            .dropdown
+            .upgrade()
+            .and_then(|dropdown| dropdown.read(cx).empty.as_ref())
+        {
+            empty(cx).into_any_element()
+        } else {
+            h_flex()
+                .justify_center()
+                .py_6()
+                .text_color(cx.theme().muted_foreground.opacity(0.6))
+                .child(Icon::new(IconName::Inbox).size(px(28.)))
+                .into_any_element()
+        }
+    }
+}
+
+pub enum DropdownEvent<D: DropdownDelegate + 'static> {
+    Confirm(Option<<D::Item as DropdownItem>::Value>),
+}
+
+/// A Dropdown element.
+pub struct Dropdown<D: DropdownDelegate + 'static> {
+    id: ElementId,
+    focus_handle: FocusHandle,
+    list: View<List<DropdownListDelegate<D>>>,
+    size: Size,
+    icon: Option<IconName>,
+    open: bool,
+    cleanable: bool,
+    placeholder: Option<SharedString>,
+    title_prefix: Option<SharedString>,
+    selected_value: Option<<D::Item as DropdownItem>::Value>,
+    empty: Option<Box<dyn Fn(&WindowContext) -> AnyElement + 'static>>,
+    width: Length,
+    menu_width: Length,
+    /// Store the bounds of the input
+    bounds: Bounds<Pixels>,
+    disabled: bool,
+}
+
+pub struct SearchableVec<T> {
+    items: Vec<T>,
+    matched_items: Vec<T>,
+}
+
+impl<T: DropdownItem + Clone> SearchableVec<T> {
+    pub fn new(items: impl Into<Vec<T>>) -> Self {
+        let items = items.into();
+        Self {
+            items: items.clone(),
+            matched_items: items,
+        }
+    }
+}
+
+impl<T: DropdownItem + Clone> DropdownDelegate for SearchableVec<T> {
+    type Item = T;
+
+    fn len(&self) -> usize {
+        self.matched_items.len()
+    }
+
+    fn get(&self, ix: usize) -> Option<&Self::Item> {
+        self.matched_items.get(ix)
+    }
+
+    fn position<V>(&self, value: &V) -> Option<usize>
+    where
+        Self::Item: DropdownItem<Value = V>,
+        V: PartialEq,
+    {
+        for (ix, item) in self.matched_items.iter().enumerate() {
+            if item.value() == value {
+                return Some(ix);
+            }
+        }
+
+        None
+    }
+
+    fn can_search(&self) -> bool {
+        true
+    }
+
+    fn perform_search(&mut self, query: &str, _cx: &mut ViewContext<Dropdown<Self>>) -> Task<()> {
+        self.matched_items = self
+            .items
+            .iter()
+            .filter(|item| item.title().to_lowercase().contains(&query.to_lowercase()))
+            .cloned()
+            .collect();
+
+        Task::Ready(Some(()))
+    }
+}
+
+impl From<Vec<SharedString>> for SearchableVec<SharedString> {
+    fn from(items: Vec<SharedString>) -> Self {
+        Self {
+            items: items.clone(),
+            matched_items: items,
+        }
+    }
+}
+
+impl<D> Dropdown<D>
+where
+    D: DropdownDelegate + 'static,
+{
+    pub fn new(
+        id: impl Into<ElementId>,
+        delegate: D,
+        selected_index: Option<usize>,
+        cx: &mut ViewContext<Self>,
+    ) -> Self {
+        let focus_handle = cx.focus_handle();
+        let delegate = DropdownListDelegate {
+            delegate,
+            dropdown: cx.view().downgrade(),
+            selected_index,
+        };
+
+        let searchable = delegate.delegate.can_search();
+
+        let list = cx.new_view(|cx| {
+            let mut list = List::new(delegate, cx).max_h(rems(20.));
+            if !searchable {
+                list = list.no_query();
+            }
+            list
+        });
+
+        cx.on_blur(&list.focus_handle(cx), Self::on_blur).detach();
+        cx.on_blur(&focus_handle, Self::on_blur).detach();
+
+        let mut this = Self {
+            id: id.into(),
+            focus_handle,
+            placeholder: None,
+            list,
+            size: Size::Medium,
+            icon: None,
+            selected_value: None,
+            open: false,
+            cleanable: false,
+            title_prefix: None,
+            empty: None,
+            width: Length::Auto,
+            menu_width: Length::Auto,
+            bounds: Bounds::default(),
+            disabled: false,
+        };
+        this.set_selected_index(selected_index, cx);
+        this
+    }
+
+    /// Set the width of the dropdown input, default: Length::Auto
+    pub fn width(mut self, width: impl Into<Length>) -> Self {
+        self.width = width.into();
+        self
+    }
+
+    /// Set the width of the dropdown menu, default: Length::Auto
+    pub fn menu_width(mut self, width: impl Into<Length>) -> Self {
+        self.menu_width = width.into();
+        self
+    }
+
+    /// Set the placeholder for display when dropdown value is empty.
+    pub fn placeholder(mut self, placeholder: impl Into<SharedString>) -> Self {
+        self.placeholder = Some(placeholder.into());
+        self
+    }
+
+    /// Set the right icon for the dropdown input, instead of the default arrow icon.
+    pub fn icon(mut self, icon: impl Into<IconName>) -> Self {
+        self.icon = Some(icon.into());
+        self
+    }
+
+    /// Set title prefix for the dropdown.
+    ///
+    /// e.g.: Country: United States
+    ///
+    /// You should set the label is `Country: `
+    pub fn title_prefix(mut self, prefix: impl Into<SharedString>) -> Self {
+        self.title_prefix = Some(prefix.into());
+        self
+    }
+
+    /// Set true to show the clear button when the input field is not empty.
+    pub fn cleanable(mut self) -> Self {
+        self.cleanable = true;
+        self
+    }
+
+    /// Set the disable state for the dropdown.
+    pub fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+
+    pub fn set_disabled(&mut self, disabled: bool) {
+        self.disabled = disabled;
+    }
+
+    pub fn empty<E, F>(mut self, f: F) -> Self
+    where
+        E: IntoElement,
+        F: Fn(&WindowContext) -> E + 'static,
+    {
+        self.empty = Some(Box::new(move |cx| f(cx).into_any_element()));
+        self
+    }
+
+    pub fn set_selected_index(
+        &mut self,
+        selected_index: Option<usize>,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.list.update(cx, |list, cx| {
+            list.set_selected_index(selected_index, cx);
+        });
+        self.update_selected_value(cx);
+    }
+
+    pub fn set_selected_value(
+        &mut self,
+        selected_value: &<D::Item as DropdownItem>::Value,
+        cx: &mut ViewContext<Self>,
+    ) where
+        <<D as DropdownDelegate>::Item as DropdownItem>::Value: PartialEq,
+    {
+        let delegate = self.list.read(cx).delegate();
+        let selected_index = delegate.delegate.position(selected_value);
+        self.set_selected_index(selected_index, cx);
+    }
+
+    pub fn selected_index(&self, cx: &WindowContext) -> Option<usize> {
+        self.list.read(cx).selected_index()
+    }
+
+    fn update_selected_value(&mut self, cx: &WindowContext) {
+        self.selected_value = self
+            .selected_index(cx)
+            .and_then(|ix| self.list.read(cx).delegate().delegate.get(ix))
+            .map(|item| item.value().clone());
+    }
+
+    pub fn selected_value(&self) -> Option<&<D::Item as DropdownItem>::Value> {
+        self.selected_value.as_ref()
+    }
+
+    pub fn focus(&self, cx: &mut WindowContext) {
+        self.focus_handle.focus(cx);
+    }
+
+    fn on_blur(&mut self, cx: &mut ViewContext<Self>) {
+        // When the dropdown and dropdown menu are both not focused, close the dropdown menu.
+        if self.list.focus_handle(cx).is_focused(cx) || self.focus_handle.is_focused(cx) {
+            return;
+        }
+
+        self.open = false;
+        cx.notify();
+    }
+
+    fn up(&mut self, _: &Up, cx: &mut ViewContext<Self>) {
+        if !self.open {
+            return;
+        }
+        self.list.focus_handle(cx).focus(cx);
+        cx.dispatch_action(Box::new(list::SelectPrev));
+    }
+
+    fn down(&mut self, _: &Down, cx: &mut ViewContext<Self>) {
+        if !self.open {
+            self.open = true;
+        }
+
+        self.list.focus_handle(cx).focus(cx);
+        cx.dispatch_action(Box::new(list::SelectNext));
+    }
+
+    fn enter(&mut self, _: &Enter, cx: &mut ViewContext<Self>) {
+        // Propagate the event to the parent view, for example to the Modal to support ENTER to confirm.
+        cx.propagate();
+
+        if !self.open {
+            self.open = true;
+            cx.notify();
+        } else {
+            self.list.focus_handle(cx).focus(cx);
+            cx.dispatch_action(Box::new(list::Confirm));
+        }
+    }
+
+    fn toggle_menu(&mut self, _: &ClickEvent, cx: &mut ViewContext<Self>) {
+        cx.stop_propagation();
+
+        self.open = !self.open;
+        if self.open {
+            self.list.focus_handle(cx).focus(cx);
+        }
+        cx.notify();
+    }
+
+    fn escape(&mut self, _: &Escape, cx: &mut ViewContext<Self>) {
+        // Propagate the event to the parent view, for example to the Modal to support ESC to close.
+        cx.propagate();
+
+        self.open = false;
+        cx.notify();
+    }
+
+    fn clean(&mut self, _: &ClickEvent, cx: &mut ViewContext<Self>) {
+        self.set_selected_index(None, cx);
+        cx.emit(DropdownEvent::Confirm(None));
+    }
+
+    fn display_title(&self, cx: &WindowContext) -> impl IntoElement {
+        let title = if let Some(selected_index) = &self.selected_index(cx) {
+            let title = self
+                .list
+                .read(cx)
+                .delegate()
+                .delegate
+                .get(*selected_index)
+                .map(|item| item.title().to_string())
+                .unwrap_or_default();
+
+            h_flex()
+                .when_some(self.title_prefix.clone(), |this, prefix| this.child(prefix))
+                .child(title.clone())
+        } else {
+            div().text_color(cx.theme().accent_foreground).child(
+                self.placeholder
+                    .clone()
+                    .unwrap_or_else(|| "Please select".into()),
+            )
+        };
+
+        title.when(self.disabled, |this| {
+            this.cursor_not_allowed()
+                .text_color(cx.theme().muted_foreground)
+        })
+    }
+}
+
+impl<D> Sizable for Dropdown<D>
+where
+    D: DropdownDelegate + 'static,
+{
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+
+impl<D> EventEmitter<DropdownEvent<D>> for Dropdown<D> where D: DropdownDelegate + 'static {}
+impl<D> EventEmitter<DismissEvent> for Dropdown<D> where D: DropdownDelegate + 'static {}
+impl<D> FocusableView for Dropdown<D>
+where
+    D: DropdownDelegate + 'static,
+{
+    fn focus_handle(&self, cx: &AppContext) -> FocusHandle {
+        if self.open {
+            self.list.focus_handle(cx)
+        } else {
+            self.focus_handle.clone()
+        }
+    }
+}
+
+impl<D> Render for Dropdown<D>
+where
+    D: DropdownDelegate + 'static,
+{
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let is_focused = self.focus_handle.is_focused(cx);
+        let show_clean = self.cleanable && self.selected_index(cx).is_some();
+        let view = cx.view().clone();
+        let bounds = self.bounds;
+        let allow_open = !(self.open || self.disabled);
+        let outline_visible = self.open || is_focused && !self.disabled;
+
+        // If the size has change, set size to self.list, to change the QueryInput size.
+        if self.list.read(cx).size != self.size {
+            self.list
+                .update(cx, |this, cx| this.set_size(self.size, cx))
+        }
+
+        div()
+            .id(self.id.clone())
+            .key_context(CONTEXT)
+            .track_focus(&self.focus_handle)
+            .on_action(cx.listener(Self::up))
+            .on_action(cx.listener(Self::down))
+            .on_action(cx.listener(Self::enter))
+            .on_action(cx.listener(Self::escape))
+            .size_full()
+            .relative()
+            .input_text_size(self.size)
+            .child(
+                div()
+                    .id("dropdown-input")
+                    .relative()
+                    .flex()
+                    .items_center()
+                    .justify_between()
+                    .bg(cx.theme().background)
+                    .border_1()
+                    .border_color(cx.theme().input)
+                    .rounded(px(cx.theme().radius))
+                    .when(cx.theme().shadow, |this| this.shadow_sm())
+                    .map(|this| {
+                        if self.disabled {
+                            this.cursor_not_allowed()
+                        } else {
+                            this.cursor_pointer()
+                        }
+                    })
+                    .overflow_hidden()
+                    .input_text_size(self.size)
+                    .map(|this| match self.width {
+                        Length::Definite(l) => this.flex_none().w(l),
+                        Length::Auto => this.w_full(),
+                    })
+                    .when(outline_visible, |this| this.outline(cx))
+                    .input_size(self.size)
+                    .when(allow_open, |this| {
+                        this.on_click(cx.listener(Self::toggle_menu))
+                    })
+                    .child(
+                        h_flex()
+                            .w_full()
+                            .items_center()
+                            .justify_between()
+                            .gap_1()
+                            .child(
+                                div()
+                                    .w_full()
+                                    .overflow_hidden()
+                                    .child(self.display_title(cx)),
+                            )
+                            .when(show_clean, |this| {
+                                this.child(ClearButton::new(cx).map(|this| {
+                                    if self.disabled {
+                                        this.disabled(true)
+                                    } else {
+                                        this.on_click(cx.listener(Self::clean))
+                                    }
+                                }))
+                            })
+                            .when(!show_clean, |this| {
+                                let icon = match self.icon.clone() {
+                                    Some(icon) => icon,
+                                    None => {
+                                        if self.open {
+                                            IconName::ChevronUp
+                                        } else {
+                                            IconName::ChevronDown
+                                        }
+                                    }
+                                };
+
+                                this.child(
+                                    Icon::new(icon)
+                                        .xsmall()
+                                        .text_color(match self.disabled {
+                                            true => cx.theme().muted_foreground.opacity(0.5),
+                                            false => cx.theme().muted_foreground,
+                                        })
+                                        .when(self.disabled, |this| this.cursor_not_allowed()),
+                                )
+                            }),
+                    )
+                    .child(
+                        canvas(
+                            move |bounds, cx| view.update(cx, |r, _| r.bounds = bounds),
+                            |_, _, _| {},
+                        )
+                        .absolute()
+                        .size_full(),
+                    ),
+            )
+            .when(self.open, |this| {
+                this.child(
+                    deferred(
+                        anchored().snap_to_window_with_margin(px(8.)).child(
+                            div()
+                                .occlude()
+                                .map(|this| match self.menu_width {
+                                    Length::Auto => this.w(bounds.size.width),
+                                    Length::Definite(w) => this.w(w),
+                                })
+                                .child(
+                                    v_flex()
+                                        .occlude()
+                                        .mt_1p5()
+                                        .bg(cx.theme().background)
+                                        .border_1()
+                                        .border_color(cx.theme().border)
+                                        .rounded(px(cx.theme().radius))
+                                        .shadow_md()
+                                        .on_mouse_down_out(|_, cx| {
+                                            cx.dispatch_action(Box::new(Escape));
+                                        })
+                                        .child(self.list.clone()),
+                                )
+                                .on_mouse_down_out(cx.listener(|this, _, cx| {
+                                    this.escape(&Escape, cx);
+                                })),
+                        ),
+                    )
+                    .with_priority(1),
+                )
+            })
+    }
+}

crates/ui/src/event.rs

@@ -0,0 +1,22 @@
+use gpui::{ClickEvent, Focusable, InteractiveElement, Stateful, WindowContext};
+
+pub trait InteractiveElementExt: InteractiveElement {
+    /// Set the listener for a double click event.
+    fn on_double_click(
+        mut self,
+        listener: impl Fn(&ClickEvent, &mut WindowContext) + 'static,
+    ) -> Self
+    where
+        Self: Sized,
+    {
+        self.interactivity().on_click(move |event, context| {
+            if event.up.click_count == 2 {
+                listener(event, context);
+            }
+        });
+        self
+    }
+}
+
+impl<E: InteractiveElement> InteractiveElementExt for Focusable<E> {}
+impl<E: InteractiveElement> InteractiveElementExt for Stateful<E> {}

crates/ui/src/focusable.rs

@@ -0,0 +1,40 @@
+use gpui::{FocusHandle, ViewContext};
+
+/// A trait for views that can cycle focus between its children.
+///
+/// This will provide a default implementation for the `cycle_focus` method that will cycle focus.
+///
+/// You should implement the `cycle_focus_handles` method to return a list of focus handles that
+/// should be cycled, and the cycle will follow the order of the list.
+pub trait FocusableCycle {
+    /// Returns a list of focus handles that should be cycled.
+    fn cycle_focus_handles(&self, cx: &mut ViewContext<Self>) -> Vec<FocusHandle>
+    where
+        Self: Sized;
+
+    /// Cycles focus between the focus handles returned by `cycle_focus_handles`.
+    /// If `is_next` is `true`, it will cycle to the next focus handle, otherwise it will cycle to prev.
+    fn cycle_focus(&self, is_next: bool, cx: &mut ViewContext<Self>)
+    where
+        Self: Sized,
+    {
+        let focused_handle = cx.focused();
+        let handles = self.cycle_focus_handles(cx);
+        let handles = if is_next {
+            handles
+        } else {
+            handles.into_iter().rev().collect()
+        };
+
+        let fallback_handle = handles[0].clone();
+        let target_focus_handle = handles
+            .into_iter()
+            .skip_while(|handle| Some(handle) != focused_handle.as_ref())
+            .skip(1)
+            .next()
+            .unwrap_or(fallback_handle);
+
+        target_focus_handle.focus(cx);
+        cx.stop_propagation();
+    }
+}

crates/ui/src/history.rs

@@ -0,0 +1,197 @@
+use std::{
+    fmt::Debug,
+    time::{Duration, Instant},
+};
+
+pub trait HistoryItem: Clone {
+    fn version(&self) -> usize;
+    fn set_version(&mut self, version: usize);
+}
+
+/// The History is used to keep track of changes to a model and to allow undo and redo operations.
+///
+/// This is now used in Input for undo/redo operations. You can also use this in
+/// your own models to keep track of changes, for example to track the tab
+/// history for prev/next features.
+#[derive(Debug)]
+pub struct History<I: HistoryItem> {
+    undos: Vec<I>,
+    redos: Vec<I>,
+    last_changed_at: Instant,
+    version: usize,
+    pub(crate) ignore: bool,
+    max_undo: usize,
+    group_interval: Option<Duration>,
+}
+
+impl<I> History<I>
+where
+    I: HistoryItem,
+{
+    pub fn new() -> Self {
+        Self {
+            undos: Default::default(),
+            redos: Default::default(),
+            ignore: false,
+            last_changed_at: Instant::now(),
+            version: 0,
+            max_undo: 1000,
+            group_interval: None,
+        }
+    }
+
+    /// Set the maximum number of undo steps to keep, defaults to 1000.
+    pub fn max_undo(mut self, max_undo: usize) -> Self {
+        self.max_undo = max_undo;
+        self
+    }
+
+    /// Set the interval in milliseconds to group changes, defaults to None.
+    pub fn group_interval(mut self, group_interval: Duration) -> Self {
+        self.group_interval = Some(group_interval);
+        self
+    }
+
+    /// Increment the version number if the last change was made more than `GROUP_INTERVAL` milliseconds ago.
+    fn inc_version(&mut self) -> usize {
+        let t = Instant::now();
+        if Some(self.last_changed_at.elapsed()) > self.group_interval {
+            self.version += 1;
+        }
+
+        self.last_changed_at = t;
+        self.version
+    }
+
+    /// Get the current version number.
+    pub fn version(&self) -> usize {
+        self.version
+    }
+
+    pub fn push(&mut self, item: I) {
+        let version = self.inc_version();
+
+        if self.undos.len() >= self.max_undo {
+            self.undos.remove(0);
+        }
+
+        let mut item = item;
+        item.set_version(version);
+        self.undos.push(item);
+    }
+
+    pub fn undo(&mut self) -> Option<Vec<I>> {
+        if let Some(first_change) = self.undos.pop() {
+            let mut changes = vec![first_change.clone()];
+            // pick the next all changes with the same version
+            while self
+                .undos
+                .iter()
+                .filter(|c| c.version() == first_change.version())
+                .count()
+                > 0
+            {
+                let change = self.undos.pop().unwrap();
+                changes.push(change);
+            }
+
+            self.redos.extend(changes.iter().rev().cloned());
+            Some(changes)
+        } else {
+            None
+        }
+    }
+
+    pub fn redo(&mut self) -> Option<Vec<I>> {
+        if let Some(first_change) = self.redos.pop() {
+            let mut changes = vec![first_change.clone()];
+            // pick the next all changes with the same version
+            while self
+                .redos
+                .iter()
+                .filter(|c| c.version() == first_change.version())
+                .count()
+                > 0
+            {
+                let change = self.redos.pop().unwrap();
+                changes.push(change);
+            }
+            self.undos.extend(changes.iter().rev().cloned());
+            Some(changes)
+        } else {
+            None
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[derive(Clone)]
+    struct TabIndex {
+        tab_index: usize,
+        version: usize,
+    }
+
+    impl From<usize> for TabIndex {
+        fn from(value: usize) -> Self {
+            TabIndex {
+                tab_index: value,
+                version: 0,
+            }
+        }
+    }
+
+    impl HistoryItem for TabIndex {
+        fn version(&self) -> usize {
+            self.version
+        }
+        fn set_version(&mut self, version: usize) {
+            self.version = version;
+        }
+    }
+
+    #[test]
+    fn test_history() {
+        let mut history: History<TabIndex> = History::new().max_undo(100);
+        history.push(0.into());
+        history.push(3.into());
+        history.push(2.into());
+        history.push(1.into());
+
+        assert_eq!(history.version(), 4);
+        let changes = history.undo().unwrap();
+        assert_eq!(changes.len(), 1);
+        assert_eq!(changes[0].tab_index, 1);
+
+        let changes = history.undo().unwrap();
+        assert_eq!(changes.len(), 1);
+        assert_eq!(changes[0].tab_index, 2);
+
+        history.push(5.into());
+
+        let changes = history.redo().unwrap();
+        assert_eq!(changes[0].tab_index, 2);
+
+        let changes = history.redo().unwrap();
+        assert_eq!(changes[0].tab_index, 1);
+
+        let changes = history.undo().unwrap();
+        assert_eq!(changes[0].tab_index, 1);
+
+        let changes = history.undo().unwrap();
+        assert_eq!(changes[0].tab_index, 2);
+
+        let changes = history.undo().unwrap();
+        assert_eq!(changes[0].tab_index, 5);
+
+        let changes = history.undo().unwrap();
+        assert_eq!(changes[0].tab_index, 3);
+
+        let changes = history.undo().unwrap();
+        assert_eq!(changes[0].tab_index, 0);
+
+        assert_eq!(history.undo().is_none(), true);
+    }
+}

crates/ui/src/icon.rs

@@ -0,0 +1,319 @@
+use crate::{theme::ActiveTheme, Sizable, Size};
+use gpui::{
+    prelude::FluentBuilder as _, svg, AnyElement, Hsla, IntoElement, Radians, Render, RenderOnce,
+    SharedString, StyleRefinement, Styled, Svg, Transformation, View, VisualContext, WindowContext,
+};
+
+#[derive(IntoElement, Clone)]
+pub enum IconName {
+    ALargeSmall,
+    ArrowDown,
+    ArrowLeft,
+    ArrowRight,
+    ArrowUp,
+    Asterisk,
+    Bell,
+    BookOpen,
+    Bot,
+    Calendar,
+    ChartPie,
+    Check,
+    ChevronDown,
+    ChevronLeft,
+    ChevronRight,
+    ChevronUp,
+    ChevronsUpDown,
+    CircleCheck,
+    CircleUser,
+    CircleX,
+    Close,
+    Copy,
+    Dash,
+    Delete,
+    Ellipsis,
+    EllipsisVertical,
+    Eye,
+    EyeOff,
+    Frame,
+    GalleryVerticalEnd,
+    GitHub,
+    Globe,
+    Heart,
+    HeartOff,
+    Inbox,
+    Info,
+    LayoutDashboard,
+    Loader,
+    LoaderCircle,
+    Map,
+    Maximize,
+    Menu,
+    Minimize,
+    Minus,
+    Moon,
+    Palette,
+    PanelBottom,
+    PanelBottomOpen,
+    PanelLeft,
+    PanelLeftClose,
+    PanelLeftOpen,
+    PanelRight,
+    PanelRightClose,
+    PanelRightOpen,
+    Plus,
+    Search,
+    Settings,
+    Settings2,
+    SortAscending,
+    SortDescending,
+    SquareTerminal,
+    Star,
+    StarOff,
+    Sun,
+    ThumbsDown,
+    ThumbsUp,
+    TriangleAlert,
+    WindowClose,
+    WindowMaximize,
+    WindowMinimize,
+    WindowRestore,
+}
+
+impl IconName {
+    pub fn path(self) -> SharedString {
+        match self {
+            IconName::ALargeSmall => "icons/a-large-small.svg",
+            IconName::ArrowDown => "icons/arrow-down.svg",
+            IconName::ArrowLeft => "icons/arrow-left.svg",
+            IconName::ArrowRight => "icons/arrow-right.svg",
+            IconName::ArrowUp => "icons/arrow-up.svg",
+            IconName::Asterisk => "icons/asterisk.svg",
+            IconName::Bell => "icons/bell.svg",
+            IconName::BookOpen => "icons/book-open.svg",
+            IconName::Bot => "icons/bot.svg",
+            IconName::Calendar => "icons/calendar.svg",
+            IconName::ChartPie => "icons/chart-pie.svg",
+            IconName::Check => "icons/check.svg",
+            IconName::ChevronDown => "icons/chevron-down.svg",
+            IconName::ChevronLeft => "icons/chevron-left.svg",
+            IconName::ChevronRight => "icons/chevron-right.svg",
+            IconName::ChevronUp => "icons/chevron-up.svg",
+            IconName::ChevronsUpDown => "icons/chevrons-up-down.svg",
+            IconName::CircleCheck => "icons/circle-check.svg",
+            IconName::CircleUser => "icons/circle-user.svg",
+            IconName::CircleX => "icons/circle-x.svg",
+            IconName::Close => "icons/close.svg",
+            IconName::Copy => "icons/copy.svg",
+            IconName::Dash => "icons/dash.svg",
+            IconName::Delete => "icons/delete.svg",
+            IconName::Ellipsis => "icons/ellipsis.svg",
+            IconName::EllipsisVertical => "icons/ellipsis-vertical.svg",
+            IconName::Eye => "icons/eye.svg",
+            IconName::EyeOff => "icons/eye-off.svg",
+            IconName::Frame => "icons/frame.svg",
+            IconName::GalleryVerticalEnd => "icons/gallery-vertical-end.svg",
+            IconName::GitHub => "icons/github.svg",
+            IconName::Globe => "icons/globe.svg",
+            IconName::Heart => "icons/heart.svg",
+            IconName::HeartOff => "icons/heart-off.svg",
+            IconName::Inbox => "icons/inbox.svg",
+            IconName::Info => "icons/info.svg",
+            IconName::LayoutDashboard => "icons/layout-dashboard.svg",
+            IconName::Loader => "icons/loader.svg",
+            IconName::LoaderCircle => "icons/loader-circle.svg",
+            IconName::Map => "icons/map.svg",
+            IconName::Maximize => "icons/maximize.svg",
+            IconName::Menu => "icons/menu.svg",
+            IconName::Minimize => "icons/minimize.svg",
+            IconName::Minus => "icons/minus.svg",
+            IconName::Moon => "icons/moon.svg",
+            IconName::Palette => "icons/palette.svg",
+            IconName::PanelBottom => "icons/panel-bottom.svg",
+            IconName::PanelBottomOpen => "icons/panel-bottom-open.svg",
+            IconName::PanelLeft => "icons/panel-left.svg",
+            IconName::PanelLeftClose => "icons/panel-left-close.svg",
+            IconName::PanelLeftOpen => "icons/panel-left-open.svg",
+            IconName::PanelRight => "icons/panel-right.svg",
+            IconName::PanelRightClose => "icons/panel-right-close.svg",
+            IconName::PanelRightOpen => "icons/panel-right-open.svg",
+            IconName::Plus => "icons/plus.svg",
+            IconName::Search => "icons/search.svg",
+            IconName::Settings => "icons/settings.svg",
+            IconName::Settings2 => "icons/settings-2.svg",
+            IconName::SortAscending => "icons/sort-ascending.svg",
+            IconName::SortDescending => "icons/sort-descending.svg",
+            IconName::SquareTerminal => "icons/square-terminal.svg",
+            IconName::Star => "icons/star.svg",
+            IconName::StarOff => "icons/star-off.svg",
+            IconName::Sun => "icons/sun.svg",
+            IconName::ThumbsDown => "icons/thumbs-down.svg",
+            IconName::ThumbsUp => "icons/thumbs-up.svg",
+            IconName::TriangleAlert => "icons/triangle-alert.svg",
+            IconName::WindowClose => "icons/window-close.svg",
+            IconName::WindowMaximize => "icons/window-maximize.svg",
+            IconName::WindowMinimize => "icons/window-minimize.svg",
+            IconName::WindowRestore => "icons/window-restore.svg",
+        }
+        .into()
+    }
+
+    /// Return the icon as a View<Icon>
+    pub fn view(self, cx: &mut WindowContext) -> View<Icon> {
+        Icon::build(self).view(cx)
+    }
+}
+
+impl From<IconName> for Icon {
+    fn from(val: IconName) -> Self {
+        Icon::build(val)
+    }
+}
+
+impl From<IconName> for AnyElement {
+    fn from(val: IconName) -> Self {
+        Icon::build(val).into_any_element()
+    }
+}
+
+impl RenderOnce for IconName {
+    fn render(self, _cx: &mut WindowContext) -> impl IntoElement {
+        Icon::build(self)
+    }
+}
+
+#[derive(IntoElement)]
+pub struct Icon {
+    base: Svg,
+    path: SharedString,
+    text_color: Option<Hsla>,
+    size: Option<Size>,
+    rotation: Option<Radians>,
+}
+
+impl Default for Icon {
+    fn default() -> Self {
+        Self {
+            base: svg().flex_none().size_4(),
+            path: "".into(),
+            text_color: None,
+            size: None,
+            rotation: None,
+        }
+    }
+}
+
+impl Clone for Icon {
+    fn clone(&self) -> Self {
+        let mut this = Self::default().path(self.path.clone());
+        if let Some(size) = self.size {
+            this = this.with_size(size);
+        }
+        this
+    }
+}
+
+pub trait IconNamed {
+    fn path(&self) -> SharedString;
+}
+
+impl Icon {
+    pub fn new(icon: impl Into<Icon>) -> Self {
+        icon.into()
+    }
+
+    fn build(name: IconName) -> Self {
+        Self::default().path(name.path())
+    }
+
+    /// Set the icon path of the Assets bundle
+    ///
+    /// For example: `icons/foo.svg`
+    pub fn path(mut self, path: impl Into<SharedString>) -> Self {
+        self.path = path.into();
+        self
+    }
+
+    /// Create a new view for the icon
+    pub fn view(self, cx: &mut WindowContext) -> View<Icon> {
+        cx.new_view(|_| self)
+    }
+
+    pub fn transform(mut self, transformation: gpui::Transformation) -> Self {
+        self.base = self.base.with_transformation(transformation);
+        self
+    }
+
+    pub fn empty() -> Self {
+        Self::default()
+    }
+
+    /// Rotate the icon by the given angle
+    pub fn rotate(mut self, radians: impl Into<Radians>) -> Self {
+        self.base = self
+            .base
+            .with_transformation(Transformation::rotate(radians));
+        self
+    }
+}
+
+impl Styled for Icon {
+    fn style(&mut self) -> &mut StyleRefinement {
+        self.base.style()
+    }
+
+    fn text_color(mut self, color: impl Into<Hsla>) -> Self {
+        self.text_color = Some(color.into());
+        self
+    }
+}
+
+impl Sizable for Icon {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = Some(size.into());
+        self
+    }
+}
+
+impl RenderOnce for Icon {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let text_color = self.text_color.unwrap_or_else(|| cx.text_style().color);
+
+        self.base
+            .text_color(text_color)
+            .when_some(self.size, |this, size| match size {
+                Size::Size(px) => this.size(px),
+                Size::XSmall => this.size_3(),
+                Size::Small => this.size_3p5(),
+                Size::Medium => this.size_4(),
+                Size::Large => this.size_6(),
+            })
+            .path(self.path)
+    }
+}
+
+impl From<Icon> for AnyElement {
+    fn from(val: Icon) -> Self {
+        val.into_any_element()
+    }
+}
+
+impl Render for Icon {
+    fn render(&mut self, cx: &mut gpui::ViewContext<Self>) -> impl IntoElement {
+        let text_color = self.text_color.unwrap_or_else(|| cx.theme().foreground);
+
+        svg()
+            .flex_none()
+            .text_color(text_color)
+            .when_some(self.size, |this, size| match size {
+                Size::Size(px) => this.size(px),
+                Size::XSmall => this.size_3(),
+                Size::Small => this.size_3p5(),
+                Size::Medium => this.size_4(),
+                Size::Large => this.size_6(),
+            })
+            .path(self.path.clone())
+            .when_some(self.rotation, |this, rotation| {
+                this.with_transformation(Transformation::rotate(rotation))
+            })
+    }
+}

crates/ui/src/indicator.rs

@@ -0,0 +1,60 @@
+use std::time::Duration;
+
+use crate::{Icon, IconName, Sizable, Size};
+use gpui::{
+    div, ease_in_out, percentage, prelude::FluentBuilder as _, Animation, AnimationExt as _, Hsla,
+    IntoElement, ParentElement, RenderOnce, Styled as _, Transformation, WindowContext,
+};
+
+#[derive(IntoElement)]
+pub struct Indicator {
+    size: Size,
+    icon: Icon,
+    speed: Duration,
+    color: Option<Hsla>,
+}
+
+impl Indicator {
+    pub fn new() -> Self {
+        Self {
+            size: Size::Medium,
+            speed: Duration::from_secs_f64(0.8),
+            icon: Icon::new(IconName::Loader),
+            color: None,
+        }
+    }
+
+    pub fn icon(mut self, icon: impl Into<Icon>) -> Self {
+        self.icon = icon.into();
+        self
+    }
+
+    pub fn color(mut self, color: Hsla) -> Self {
+        self.color = Some(color);
+        self
+    }
+}
+
+impl Sizable for Indicator {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+
+impl RenderOnce for Indicator {
+    fn render(self, _: &mut WindowContext) -> impl IntoElement {
+        div()
+            .child(
+                self.icon
+                    .with_size(self.size)
+                    .when_some(self.color, |this, color| this.text_color(color))
+                    .with_animation(
+                        "circle",
+                        Animation::new(self.speed).repeat().with_easing(ease_in_out),
+                        |this, delta| this.transform(Transformation::rotate(percentage(delta))),
+                    ),
+            )
+            .into_element()
+    }
+}

crates/ui/src/input/blink_cursor.rs

@@ -0,0 +1,88 @@
+use std::time::Duration;
+
+use gpui::{ModelContext, Timer};
+
+static INTERVAL: Duration = Duration::from_millis(500);
+static PAUSE_DELAY: Duration = Duration::from_millis(300);
+
+/// To manage the Input cursor blinking.
+///
+/// It will start blinking with a interval of 500ms.
+/// Every loop will notify the view to update the `visible`, and Input will observe this update to touch repaint.
+///
+/// The input painter will check if this in visible state, then it will draw the cursor.
+pub(crate) struct BlinkCursor {
+    visible: bool,
+    paused: bool,
+    epoch: usize,
+}
+
+impl BlinkCursor {
+    pub fn new() -> Self {
+        Self {
+            visible: false,
+            paused: false,
+            epoch: 0,
+        }
+    }
+
+    /// Start the blinking
+    pub fn start(&mut self, cx: &mut ModelContext<Self>) {
+        self.blink(self.epoch, cx);
+    }
+
+    pub fn stop(&mut self, cx: &mut ModelContext<Self>) {
+        self.epoch = 0;
+        cx.notify();
+    }
+
+    fn next_epoch(&mut self) -> usize {
+        self.epoch += 1;
+        self.epoch
+    }
+
+    fn blink(&mut self, epoch: usize, cx: &mut ModelContext<Self>) {
+        if self.paused || epoch != self.epoch {
+            return;
+        }
+
+        self.visible = !self.visible;
+        cx.notify();
+
+        // Schedule the next blink
+        let epoch = self.next_epoch();
+        cx.spawn(|this, mut cx| async move {
+            Timer::after(INTERVAL).await;
+            if let Some(this) = this.upgrade() {
+                this.update(&mut cx, |this, cx| this.blink(epoch, cx)).ok();
+            }
+        })
+        .detach();
+    }
+
+    pub fn visible(&self) -> bool {
+        // Keep showing the cursor if paused
+        self.paused || self.visible
+    }
+
+    /// Pause the blinking, and delay 500ms to resume the blinking.
+    pub fn pause(&mut self, cx: &mut ModelContext<Self>) {
+        self.paused = true;
+        cx.notify();
+
+        // delay 500ms to start the blinking
+        let epoch = self.next_epoch();
+        cx.spawn(|this, mut cx| async move {
+            Timer::after(PAUSE_DELAY).await;
+
+            if let Some(this) = this.upgrade() {
+                this.update(&mut cx, |this, cx| {
+                    this.paused = false;
+                    this.blink(epoch, cx);
+                })
+                .ok();
+            }
+        })
+        .detach();
+    }
+}

crates/ui/src/input/change.rs

@@ -0,0 +1,39 @@
+use std::{fmt::Debug, ops::Range};
+
+use crate::history::HistoryItem;
+
+#[derive(Debug, Clone)]
+pub struct Change {
+    pub(crate) old_range: Range<usize>,
+    pub(crate) old_text: String,
+    pub(crate) new_range: Range<usize>,
+    pub(crate) new_text: String,
+    version: usize,
+}
+
+impl Change {
+    pub fn new(
+        old_range: Range<usize>,
+        old_text: &str,
+        new_range: Range<usize>,
+        new_text: &str,
+    ) -> Self {
+        Self {
+            old_range,
+            old_text: old_text.to_string(),
+            new_range,
+            new_text: new_text.to_string(),
+            version: 0,
+        }
+    }
+}
+
+impl HistoryItem for Change {
+    fn version(&self) -> usize {
+        self.version
+    }
+
+    fn set_version(&mut self, version: usize) {
+        self.version = version;
+    }
+}

crates/ui/src/input/clear_button.rs

@@ -0,0 +1,18 @@
+use gpui::{Styled, WindowContext};
+
+use crate::{
+    button::{Button, ButtonVariants as _},
+    theme::ActiveTheme as _,
+    Icon, IconName, Sizable as _,
+};
+
+pub(crate) struct ClearButton {}
+
+impl ClearButton {
+    pub fn new(cx: &mut WindowContext) -> Button {
+        Button::new("clean")
+            .icon(Icon::new(IconName::CircleX).text_color(cx.theme().muted_foreground))
+            .ghost()
+            .xsmall()
+    }
+}

crates/ui/src/input/element.rs

@@ -0,0 +1,537 @@
+use gpui::{
+    fill, point, px, relative, size, Bounds, Corners, Element, ElementId, ElementInputHandler,
+    GlobalElementId, IntoElement, LayoutId, MouseButton, MouseMoveEvent, PaintQuad, Path, Pixels,
+    Point, Style, TextRun, UnderlineStyle, View, WindowContext, WrappedLine,
+};
+use smallvec::SmallVec;
+
+use crate::theme::ActiveTheme as _;
+
+use super::TextInput;
+
+const RIGHT_MARGIN: Pixels = px(5.);
+const CURSOR_INSET: Pixels = px(0.5);
+
+pub(super) struct TextElement {
+    input: View<TextInput>,
+}
+
+impl TextElement {
+    pub(super) fn new(input: View<TextInput>) -> Self {
+        Self { input }
+    }
+
+    fn paint_mouse_listeners(&mut self, cx: &mut WindowContext) {
+        cx.on_mouse_event({
+            let input = self.input.clone();
+
+            move |event: &MouseMoveEvent, _, cx| {
+                if event.pressed_button == Some(MouseButton::Left) {
+                    input.update(cx, |input, cx| {
+                        input.on_drag_move(event, cx);
+                    });
+                }
+            }
+        });
+    }
+
+    fn layout_cursor(
+        &self,
+        lines: &[WrappedLine],
+        line_height: Pixels,
+        bounds: &mut Bounds<Pixels>,
+        cx: &mut WindowContext,
+    ) -> (Option<PaintQuad>, Point<Pixels>) {
+        let input = self.input.read(cx);
+        let selected_range = &input.selected_range;
+        let cursor_offset = input.cursor_offset();
+        let mut scroll_offset = input.scroll_handle.offset();
+        let mut cursor = None;
+
+        // The cursor corresponds to the current cursor position in the text no only the line.
+        let mut cursor_pos = None;
+        let mut cursor_start = None;
+        let mut cursor_end = None;
+
+        let mut prev_lines_offset = 0;
+        let mut offset_y = px(0.);
+        for line in lines.iter() {
+            // break loop if all cursor positions are found
+            if cursor_pos.is_some() && cursor_start.is_some() && cursor_end.is_some() {
+                break;
+            }
+
+            let line_origin = point(px(0.), offset_y);
+            if cursor_pos.is_none() {
+                let offset = cursor_offset.saturating_sub(prev_lines_offset);
+                if let Some(pos) = line.position_for_index(offset, line_height) {
+                    cursor_pos = Some(line_origin + pos);
+                }
+            }
+            if cursor_start.is_none() {
+                let offset = selected_range.start.saturating_sub(prev_lines_offset);
+                if let Some(pos) = line.position_for_index(offset, line_height) {
+                    cursor_start = Some(line_origin + pos);
+                }
+            }
+            if cursor_end.is_none() {
+                let offset = selected_range.end.saturating_sub(prev_lines_offset);
+                if let Some(pos) = line.position_for_index(offset, line_height) {
+                    cursor_end = Some(line_origin + pos);
+                }
+            }
+
+            offset_y += line.size(line_height).height;
+            // +1 for skip the last `\n`
+            prev_lines_offset += line.len() + 1;
+        }
+
+        if let (Some(cursor_pos), Some(cursor_start), Some(cursor_end)) =
+            (cursor_pos, cursor_start, cursor_end)
+        {
+            let cursor_moved = input.last_cursor_offset != Some(cursor_offset);
+            let selection_changed = input.last_selected_range != Some(selected_range.clone());
+
+            if cursor_moved || selection_changed {
+                scroll_offset.x =
+                    if scroll_offset.x + cursor_pos.x > (bounds.size.width - RIGHT_MARGIN) {
+                        // cursor is out of right
+                        bounds.size.width - RIGHT_MARGIN - cursor_pos.x
+                    } else if scroll_offset.x + cursor_pos.x < px(0.) {
+                        // cursor is out of left
+                        scroll_offset.x - cursor_pos.x
+                    } else {
+                        scroll_offset.x
+                    };
+                scroll_offset.y = if scroll_offset.y + cursor_pos.y > (bounds.size.height) {
+                    // cursor is out of bottom
+                    bounds.size.height - cursor_pos.y
+                } else if scroll_offset.y + cursor_pos.y < px(0.) {
+                    // cursor is out of top
+                    scroll_offset.y - cursor_pos.y
+                } else {
+                    scroll_offset.y
+                };
+
+                if input.selection_reversed {
+                    if scroll_offset.x + cursor_start.x < px(0.) {
+                        // selection start is out of left
+                        scroll_offset.x = -cursor_start.x;
+                    }
+                    if scroll_offset.y + cursor_start.y < px(0.) {
+                        // selection start is out of top
+                        scroll_offset.y = -cursor_start.y;
+                    }
+                } else {
+                    if scroll_offset.x + cursor_end.x <= px(0.) {
+                        // selection end is out of left
+                        scroll_offset.x = -cursor_end.x;
+                    }
+                    if scroll_offset.y + cursor_end.y <= px(0.) {
+                        // selection end is out of top
+                        scroll_offset.y = -cursor_end.y;
+                    }
+                }
+            }
+
+            bounds.origin = bounds.origin + scroll_offset;
+
+            if input.show_cursor(cx) {
+                // cursor blink
+                cursor = Some(fill(
+                    Bounds::new(
+                        point(
+                            bounds.left() + cursor_pos.x,
+                            bounds.top() + cursor_pos.y + CURSOR_INSET,
+                        ),
+                        size(px(1.5), line_height),
+                    ),
+                    crate::blue_500(),
+                ))
+            };
+        }
+
+        (cursor, scroll_offset)
+    }
+
+    fn layout_selections(
+        &self,
+        lines: &[WrappedLine],
+        line_height: Pixels,
+        bounds: &mut Bounds<Pixels>,
+        cx: &mut WindowContext,
+    ) -> Option<Path<Pixels>> {
+        let input = self.input.read(cx);
+        let selected_range = &input.selected_range;
+        if selected_range.is_empty() {
+            return None;
+        }
+
+        let (start_ix, end_ix) = if selected_range.start < selected_range.end {
+            (selected_range.start, selected_range.end)
+        } else {
+            (selected_range.end, selected_range.start)
+        };
+
+        let mut prev_lines_offset = 0;
+        let mut line_corners = vec![];
+
+        let mut offset_y = px(0.);
+        for line in lines.iter() {
+            let line_size = line.size(line_height);
+            let line_wrap_width = line_size.width;
+
+            let line_origin = point(px(0.), offset_y);
+
+            let line_cursor_start =
+                line.position_for_index(start_ix.saturating_sub(prev_lines_offset), line_height);
+            let line_cursor_end =
+                line.position_for_index(end_ix.saturating_sub(prev_lines_offset), line_height);
+
+            if line_cursor_start.is_some() || line_cursor_end.is_some() {
+                let start = line_cursor_start
+                    .unwrap_or_else(|| line.position_for_index(0, line_height).unwrap());
+
+                let end = line_cursor_end
+                    .unwrap_or_else(|| line.position_for_index(line.len(), line_height).unwrap());
+
+                // Split the selection into multiple items
+                let wrapped_lines =
+                    (end.y / line_height).ceil() as usize - (start.y / line_height).ceil() as usize;
+
+                let mut end_x = end.x;
+                if wrapped_lines > 0 {
+                    end_x = line_wrap_width;
+                }
+
+                line_corners.push(Corners {
+                    top_left: line_origin + point(start.x, start.y),
+                    top_right: line_origin + point(end_x, start.y),
+                    bottom_left: line_origin + point(start.x, start.y + line_height),
+                    bottom_right: line_origin + point(end_x, start.y + line_height),
+                });
+
+                // wrapped lines
+                for i in 1..=wrapped_lines {
+                    let start = point(px(0.), start.y + i as f32 * line_height);
+                    let mut end = point(end.x, end.y + i as f32 * line_height);
+                    if i < wrapped_lines {
+                        end.x = line_size.width;
+                    }
+
+                    line_corners.push(Corners {
+                        top_left: line_origin + point(start.x, start.y),
+                        top_right: line_origin + point(end.x, start.y),
+                        bottom_left: line_origin + point(start.x, start.y + line_height),
+                        bottom_right: line_origin + point(end.x, start.y + line_height),
+                    });
+                }
+            }
+
+            if line_cursor_start.is_some() && line_cursor_end.is_some() {
+                break;
+            }
+
+            offset_y += line_size.height;
+            // +1 for skip the last `\n`
+            prev_lines_offset += line.len() + 1;
+        }
+
+        let mut points = vec![];
+        if line_corners.is_empty() {
+            return None;
+        }
+
+        // Fix corners to make sure the left to right direction
+        for corners in &mut line_corners {
+            if corners.top_left.x > corners.top_right.x {
+                std::mem::swap(&mut corners.top_left, &mut corners.top_right);
+                std::mem::swap(&mut corners.bottom_left, &mut corners.bottom_right);
+            }
+        }
+
+        for corners in &line_corners {
+            points.push(corners.top_right);
+            points.push(corners.bottom_right);
+            points.push(corners.bottom_left);
+        }
+
+        let mut rev_line_corners = line_corners.iter().rev().peekable();
+        while let Some(corners) = rev_line_corners.next() {
+            points.push(corners.top_left);
+            if let Some(next) = rev_line_corners.peek() {
+                if next.top_left.x > corners.top_left.x {
+                    points.push(point(next.top_left.x, corners.top_left.y));
+                }
+            }
+        }
+
+        // print_points_as_svg_path(&line_corners, &points);
+
+        let first_p = *points.get(0).unwrap();
+        let mut path = gpui::Path::new(bounds.origin + first_p);
+        for p in points.iter().skip(1) {
+            path.line_to(bounds.origin + *p);
+        }
+        Some(path)
+    }
+}
+
+pub(super) struct PrepaintState {
+    lines: SmallVec<[WrappedLine; 1]>,
+    cursor: Option<PaintQuad>,
+    cursor_scroll_offset: Point<Pixels>,
+    selection_path: Option<Path<Pixels>>,
+    bounds: Bounds<Pixels>,
+}
+
+impl IntoElement for TextElement {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+/// A debug function to print points as SVG path.
+#[allow(unused)]
+fn print_points_as_svg_path(
+    line_corners: &Vec<Corners<Point<Pixels>>>,
+    points: &Vec<Point<Pixels>>,
+) {
+    for corners in line_corners {
+        println!(
+            "tl: ({}, {}), tr: ({}, {}), bl: ({}, {}), br: ({}, {})",
+            corners.top_left.x.0 as i32,
+            corners.top_left.y.0 as i32,
+            corners.top_right.x.0 as i32,
+            corners.top_right.y.0 as i32,
+            corners.bottom_left.x.0 as i32,
+            corners.bottom_left.y.0 as i32,
+            corners.bottom_right.x.0 as i32,
+            corners.bottom_right.y.0 as i32,
+        );
+    }
+
+    if points.len() > 0 {
+        println!("M{},{}", points[0].x.0 as i32, points[0].y.0 as i32);
+        for p in points.iter().skip(1) {
+            println!("L{},{}", p.x.0 as i32, p.y.0 as i32);
+        }
+    }
+}
+
+impl Element for TextElement {
+    type RequestLayoutState = ();
+    type PrepaintState = PrepaintState;
+
+    fn id(&self) -> Option<ElementId> {
+        None
+    }
+
+    fn request_layout(
+        &mut self,
+        _id: Option<&GlobalElementId>,
+        cx: &mut WindowContext,
+    ) -> (LayoutId, Self::RequestLayoutState) {
+        let input = self.input.read(cx);
+        let mut style = Style::default();
+        style.size.width = relative(1.).into();
+        if self.input.read(cx).is_multi_line() {
+            style.size.height = relative(1.).into();
+            style.min_size.height = (input.rows.max(1) as f32 * cx.line_height()).into();
+        } else {
+            style.size.height = cx.line_height().into();
+        };
+        (cx.request_layout(style, []), ())
+    }
+
+    fn prepaint(
+        &mut self,
+        _id: Option<&GlobalElementId>,
+        bounds: Bounds<Pixels>,
+        _request_layout: &mut Self::RequestLayoutState,
+        cx: &mut WindowContext,
+    ) -> Self::PrepaintState {
+        let multi_line = self.input.read(cx).is_multi_line();
+        let line_height = cx.line_height();
+        let input = self.input.read(cx);
+        let text = input.text.clone();
+        let placeholder = input.placeholder.clone();
+        let style = cx.text_style();
+        let mut bounds = bounds;
+
+        let (display_text, text_color) = if text.is_empty() {
+            (placeholder, cx.theme().muted_foreground)
+        } else if input.masked {
+            (
+                "*".repeat(text.chars().count()).into(),
+                cx.theme().foreground,
+            )
+        } else {
+            (text, cx.theme().foreground)
+        };
+
+        let run = TextRun {
+            len: display_text.len(),
+            font: style.font(),
+            color: text_color,
+            background_color: None,
+            underline: None,
+            strikethrough: None,
+        };
+
+        let runs = if let Some(marked_range) = input.marked_range.as_ref() {
+            vec![
+                TextRun {
+                    len: marked_range.start,
+                    ..run.clone()
+                },
+                TextRun {
+                    len: marked_range.end - marked_range.start,
+                    underline: Some(UnderlineStyle {
+                        color: Some(run.color),
+                        thickness: px(1.0),
+                        wavy: false,
+                    }),
+                    ..run.clone()
+                },
+                TextRun {
+                    len: display_text.len() - marked_range.end,
+                    ..run.clone()
+                },
+            ]
+            .into_iter()
+            .filter(|run| run.len > 0)
+            .collect()
+        } else {
+            vec![run]
+        };
+
+        let font_size = style.font_size.to_pixels(cx.rem_size());
+        let wrap_width = if multi_line {
+            Some(bounds.size.width - RIGHT_MARGIN)
+        } else {
+            None
+        };
+
+        let lines = cx
+            .text_system()
+            .shape_text(display_text, font_size, &runs, wrap_width)
+            .unwrap();
+
+        // `position_for_index` for example
+        //
+        // #### text
+        //
+        // Hello 世界，this is GPUI component.
+        // The GPUI Component is a collection of UI components for
+        // GPUI framework, including Button, Input, Checkbox, Radio,
+        // Dropdown, Tab, and more...
+        //
+        // wrap_width: 444px, line_height: 20px
+        //
+        // #### lines[0]
+        //
+        // | index | pos              | line |
+        // |-------|------------------|------|
+        // | 5     | (37 px, 0.0)     | 0    |
+        // | 38    | (261.7 px, 20.0) | 0    |
+        // | 40    | None             | -    |
+        //
+        // #### lines[1]
+        //
+        // | index | position              | line |
+        // |-------|-----------------------|------|
+        // | 5     | (43.578125 px, 0.0)   | 0    |
+        // | 56    | (422.21094 px, 0.0)   | 0    |
+        // | 57    | (11.6328125 px, 20.0) | 1    |
+        // | 114   | (429.85938 px, 20.0)  | 1    |
+        // | 115   | (11.3125 px, 40.0)    | 2    |
+
+        // Calculate the scroll offset to keep the cursor in view
+
+        let (cursor, cursor_scroll_offset) =
+            self.layout_cursor(&lines, line_height, &mut bounds, cx);
+
+        let selection_path = self.layout_selections(&lines, line_height, &mut bounds, cx);
+
+        PrepaintState {
+            bounds,
+            lines,
+            cursor,
+            cursor_scroll_offset,
+            selection_path,
+        }
+    }
+
+    fn paint(
+        &mut self,
+        _id: Option<&GlobalElementId>,
+        input_bounds: Bounds<Pixels>,
+        _request_layout: &mut Self::RequestLayoutState,
+        prepaint: &mut Self::PrepaintState,
+        cx: &mut WindowContext,
+    ) {
+        let focus_handle = self.input.read(cx).focus_handle.clone();
+        let focused = focus_handle.is_focused(cx);
+        let bounds = prepaint.bounds;
+        let selected_range = self.input.read(cx).selected_range.clone();
+
+        cx.handle_input(
+            &focus_handle,
+            ElementInputHandler::new(bounds, self.input.clone()),
+        );
+
+        // Paint selections
+        if let Some(path) = prepaint.selection_path.take() {
+            cx.paint_path(path, cx.theme().selection);
+        }
+
+        // Paint multi line text
+        let line_height = cx.line_height();
+        let origin = bounds.origin;
+
+        let mut offset_y = px(0.);
+        for line in prepaint.lines.iter() {
+            let p = point(origin.x, origin.y + offset_y);
+            _ = line.paint(p, line_height, cx);
+            offset_y += line.size(line_height).height;
+        }
+
+        if focused {
+            if let Some(cursor) = prepaint.cursor.take() {
+                cx.paint_quad(cursor);
+            }
+        }
+
+        let width = prepaint
+            .lines
+            .iter()
+            .map(|l| l.width())
+            .max()
+            .unwrap_or_default();
+        let height = prepaint
+            .lines
+            .iter()
+            .map(|l| l.size(line_height).height.0)
+            .sum::<f32>();
+
+        let scroll_size = size(width, px(height));
+
+        self.input.update(cx, |input, _cx| {
+            input.last_layout = Some(prepaint.lines.clone());
+            input.last_bounds = Some(bounds);
+            input.last_cursor_offset = Some(input.cursor_offset());
+            input.last_line_height = line_height;
+            input.input_bounds = input_bounds;
+            input.last_selected_range = Some(selected_range);
+            input
+                .scroll_handle
+                .set_offset(prepaint.cursor_scroll_offset);
+            input.scroll_size = scroll_size;
+        });
+
+        self.paint_mouse_listeners(cx);
+    }
+}

crates/ui/src/input/mod.rs

@@ -0,0 +1,10 @@
+mod blink_cursor;
+mod change;
+mod clear_button;
+mod element;
+mod input;
+mod otp_input;
+
+pub(crate) use clear_button::*;
+pub use input::*;
+pub use otp_input::*;

crates/ui/src/input/otp_input.rs

@@ -0,0 +1,274 @@
+use gpui::{
+    div, prelude::FluentBuilder, px, AnyElement, Context, EventEmitter, FocusHandle, FocusableView,
+    InteractiveElement, IntoElement, KeyDownEvent, Model, MouseButton, MouseDownEvent,
+    ParentElement as _, Render, SharedString, Styled as _, ViewContext,
+};
+
+use crate::{h_flex, theme::ActiveTheme, v_flex, Icon, IconName, Sizable, Size};
+
+use super::{blink_cursor::BlinkCursor, InputEvent};
+
+pub enum InputOptEvent {
+    /// When all OTP input have filled, this event will be triggered.
+    Change(SharedString),
+}
+
+/// A One Time Password (OTP) input element.
+///
+/// This can accept a fixed length number and can be masked.
+///
+/// Use case example:
+///
+/// - SMS OTP
+/// - Authenticator OTP
+pub struct OtpInput {
+    focus_handle: FocusHandle,
+    length: usize,
+    number_of_groups: usize,
+    masked: bool,
+    value: SharedString,
+    blink_cursor: Model<BlinkCursor>,
+    size: Size,
+}
+
+impl OtpInput {
+    pub fn new(length: usize, cx: &mut ViewContext<Self>) -> Self {
+        let focus_handle = cx.focus_handle();
+        let blink_cursor = cx.new_model(|_| BlinkCursor::new());
+        let input = Self {
+            focus_handle: focus_handle.clone(),
+            length,
+            number_of_groups: 2,
+            value: SharedString::default(),
+            masked: false,
+            blink_cursor: blink_cursor.clone(),
+            size: Size::Medium,
+        };
+
+        // Observe the blink cursor to repaint the view when it changes.
+        cx.observe(&blink_cursor, |_, _, cx| cx.notify()).detach();
+        // Blink the cursor when the window is active, pause when it's not.
+        cx.observe_window_activation(|this, cx| {
+            if cx.is_window_active() {
+                let focus_handle = this.focus_handle.clone();
+                if focus_handle.is_focused(cx) {
+                    this.blink_cursor.update(cx, |blink_cursor, cx| {
+                        blink_cursor.start(cx);
+                    });
+                }
+            }
+        })
+        .detach();
+
+        cx.on_focus(&focus_handle, Self::on_focus).detach();
+        cx.on_blur(&focus_handle, Self::on_blur).detach();
+
+        input
+    }
+
+    /// Set number of groups in the OTP Input.
+    pub fn groups(mut self, n: usize) -> Self {
+        self.number_of_groups = n;
+        self
+    }
+
+    /// Set default value of the OTP Input.
+    pub fn default_value(mut self, value: impl Into<SharedString>) -> Self {
+        self.value = value.into();
+        self
+    }
+
+    /// Set value of the OTP Input.
+    pub fn set_value(&mut self, value: impl Into<SharedString>, cx: &mut ViewContext<Self>) {
+        self.value = value.into();
+        cx.notify();
+    }
+
+    /// Return the value of the OTP Input.
+    pub fn value(&self) -> SharedString {
+        self.value.clone()
+    }
+
+    /// Set masked to true use masked input.
+    pub fn masked(mut self, masked: bool) -> Self {
+        self.masked = masked;
+        self
+    }
+
+    /// Set masked to true use masked input.
+    pub fn set_masked(&mut self, masked: bool, cx: &mut ViewContext<Self>) {
+        self.masked = masked;
+        cx.notify();
+    }
+
+    pub fn focus(&self, cx: &mut ViewContext<Self>) {
+        self.focus_handle.focus(cx);
+    }
+
+    fn on_input_mouse_down(&mut self, _: &MouseDownEvent, cx: &mut ViewContext<Self>) {
+        cx.focus(&self.focus_handle);
+    }
+
+    fn on_key_down(&mut self, event: &KeyDownEvent, cx: &mut ViewContext<Self>) {
+        let mut chars: Vec<char> = self.value.chars().collect();
+        let ix = chars.len();
+
+        let key = event.keystroke.key.as_str();
+
+        match key {
+            "backspace" => {
+                if ix > 0 {
+                    let ix = ix - 1;
+                    chars.remove(ix);
+                }
+
+                cx.prevent_default();
+                cx.stop_propagation();
+            }
+            _ => {
+                let c = key.chars().next().unwrap();
+                if !matches!(c, '0'..='9') {
+                    return;
+                }
+                if ix >= self.length {
+                    return;
+                }
+
+                chars.push(c);
+
+                cx.prevent_default();
+                cx.stop_propagation();
+            }
+        }
+
+        self.pause_blink_cursor(cx);
+        self.value = SharedString::from(chars.iter().collect::<String>());
+
+        if self.value.chars().count() == self.length {
+            cx.emit(InputEvent::Change(self.value.clone()));
+        }
+        cx.notify()
+    }
+
+    fn on_focus(&mut self, cx: &mut ViewContext<Self>) {
+        self.blink_cursor.update(cx, |cursor, cx| {
+            cursor.start(cx);
+        });
+        cx.emit(InputEvent::Focus);
+    }
+
+    fn on_blur(&mut self, cx: &mut ViewContext<Self>) {
+        self.blink_cursor.update(cx, |cursor, cx| {
+            cursor.stop(cx);
+        });
+        cx.emit(InputEvent::Blur);
+    }
+
+    fn pause_blink_cursor(&mut self, cx: &mut ViewContext<Self>) {
+        self.blink_cursor.update(cx, |cursor, cx| {
+            cursor.pause(cx);
+        });
+    }
+}
+
+impl Sizable for OtpInput {
+    fn with_size(mut self, size: impl Into<crate::Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+
+impl FocusableView for OtpInput {
+    fn focus_handle(&self, _: &gpui::AppContext) -> FocusHandle {
+        self.focus_handle.clone()
+    }
+}
+impl EventEmitter<InputEvent> for OtpInput {}
+
+impl Render for OtpInput {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let blink_show = self.blink_cursor.read(cx).visible();
+        let is_focused = self.focus_handle.is_focused(cx);
+
+        let text_size = match self.size {
+            Size::XSmall => px(14.),
+            Size::Small => px(14.),
+            Size::Medium => px(16.),
+            Size::Large => px(18.),
+            Size::Size(v) => v * 0.5,
+        };
+
+        let mut groups: Vec<Vec<AnyElement>> = Vec::with_capacity(self.number_of_groups);
+        let mut group_ix = 0;
+        let group_items_count = self.length / self.number_of_groups;
+        for _ in 0..self.number_of_groups {
+            groups.push(vec![]);
+        }
+
+        for i in 0..self.length {
+            let c = self.value.chars().nth(i);
+            if i % group_items_count == 0 && i != 0 {
+                group_ix += 1;
+            }
+
+            let is_input_focused = i == self.value.chars().count() && is_focused;
+
+            groups[group_ix].push(
+                h_flex()
+                    .id(("input-otp", i))
+                    .border_1()
+                    .border_color(cx.theme().input)
+                    .bg(cx.theme().background)
+                    .when(is_input_focused, |this| this.border_color(cx.theme().ring))
+                    .when(cx.theme().shadow, |this| this.shadow_sm())
+                    .items_center()
+                    .justify_center()
+                    .rounded_md()
+                    .text_size(text_size)
+                    .map(|this| match self.size {
+                        Size::XSmall => this.w_6().h_6(),
+                        Size::Small => this.w_6().h_6(),
+                        Size::Medium => this.w_8().h_8(),
+                        Size::Large => this.w_11().h_11(),
+                        Size::Size(px) => this.w(px).h(px),
+                    })
+                    .on_mouse_down(MouseButton::Left, cx.listener(Self::on_input_mouse_down))
+                    .map(|this| match c {
+                        Some(c) => {
+                            if self.masked {
+                                this.child(
+                                    Icon::new(IconName::Asterisk)
+                                        .text_color(cx.theme().secondary_foreground)
+                                        .with_size(text_size),
+                                )
+                            } else {
+                                this.child(c.to_string())
+                            }
+                        }
+                        None => this.when(is_input_focused && blink_show, |this| {
+                            this.child(
+                                div()
+                                    .h_4()
+                                    .w_0()
+                                    .border_l_3()
+                                    .border_color(crate::blue_500()),
+                            )
+                        }),
+                    })
+                    .into_any_element(),
+            );
+        }
+
+        v_flex()
+            .track_focus(&self.focus_handle)
+            .on_key_down(cx.listener(Self::on_key_down))
+            .items_center()
+            .child(
+                h_flex().items_center().gap_5().children(
+                    groups
+                        .into_iter()
+                        .map(|inputs| h_flex().items_center().gap_1().children(inputs)),
+                ),
+            )
+    }
+}

crates/ui/src/label.rs

@@ -0,0 +1,94 @@
+use gpui::{
+    div, prelude::FluentBuilder, rems, Div, IntoElement, ParentElement, RenderOnce, SharedString,
+    Styled, WindowContext,
+};
+
+use crate::{h_flex, theme::ActiveTheme};
+
+const MASKED: &str = "•";
+
+#[derive(Default, PartialEq, Eq)]
+pub enum TextAlign {
+    #[default]
+    Left,
+    Center,
+    Right,
+}
+
+#[derive(IntoElement)]
+pub struct Label {
+    base: Div,
+    label: SharedString,
+    align: TextAlign,
+    marked: bool,
+}
+
+impl Label {
+    pub fn new(label: impl Into<SharedString>) -> Self {
+        Self {
+            base: h_flex().line_height(rems(1.25)),
+            label: label.into(),
+            align: TextAlign::default(),
+            marked: false,
+        }
+    }
+
+    pub fn text_align(mut self, align: TextAlign) -> Self {
+        self.align = align;
+        self
+    }
+
+    pub fn text_left(mut self) -> Self {
+        self.align = TextAlign::Left;
+        self
+    }
+
+    pub fn text_center(mut self) -> Self {
+        self.align = TextAlign::Center;
+        self
+    }
+
+    pub fn text_right(mut self) -> Self {
+        self.align = TextAlign::Right;
+        self
+    }
+
+    pub fn masked(mut self, masked: bool) -> Self {
+        self.marked = masked;
+        self
+    }
+}
+
+impl Styled for Label {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl RenderOnce for Label {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let text = self.label;
+
+        let text_display = if self.marked {
+            MASKED.repeat(text.chars().count())
+        } else {
+            text.to_string()
+        };
+
+        div().text_color(cx.theme().foreground).child(
+            self.base
+                .map(|this| match self.align {
+                    TextAlign::Left => this.justify_start(),
+                    TextAlign::Center => this.justify_center(),
+                    TextAlign::Right => this.justify_end(),
+                })
+                .map(|this| {
+                    if self.align == TextAlign::Left {
+                        this.child(div().size_full().child(text_display))
+                    } else {
+                        this.child(text_display)
+                    }
+                }),
+        )
+    }
+}

crates/ui/src/lib.rs

@@ -1 +1,82 @@
+mod colors;
+mod event;
+mod focusable;
+mod icon;
+mod root;
+mod styled;
+mod svg_img;
+mod title_bar;
 
+pub mod accordion;
+pub mod animation;
+pub mod badge;
+pub mod breadcrumb;
+pub mod button;
+pub mod button_group;
+pub mod checkbox;
+pub mod clipboard;
+pub mod color_picker;
+pub mod context_menu;
+pub mod divider;
+pub mod dock;
+pub mod drawer;
+pub mod dropdown;
+pub mod history;
+pub mod indicator;
+pub mod input;
+pub mod label;
+pub mod link;
+pub mod list;
+pub mod modal;
+pub mod notification;
+pub mod number_input;
+pub mod popover;
+pub mod popup_menu;
+pub mod prelude;
+pub mod progress;
+pub mod radio;
+pub mod resizable;
+pub mod scroll;
+pub mod sidebar;
+pub mod skeleton;
+pub mod slider;
+pub mod switch;
+pub mod tab;
+pub mod table;
+pub mod theme;
+pub mod tooltip;
+
+pub use crate::Disableable;
+pub use event::InteractiveElementExt;
+pub use focusable::FocusableCycle;
+pub use root::{ContextModal, Root};
+pub use styled::*;
+pub use title_bar::*;
+
+pub use colors::*;
+pub use icon::*;
+pub use svg_img::*;
+
+use rust_embed::RustEmbed;
+
+#[derive(RustEmbed)]
+#[folder = "../../assets"]
+pub struct Assets;
+
+/// Initialize the UI module.
+///
+/// This must be called before using any of the UI components.
+/// You can initialize the UI module at your application's entry point.
+pub fn init(cx: &mut gpui::AppContext) {
+    theme::init(cx);
+    dock::init(cx);
+    drawer::init(cx);
+    dropdown::init(cx);
+    input::init(cx);
+    number_input::init(cx);
+    list::init(cx);
+    modal::init(cx);
+    popover::init(cx);
+    popup_menu::init(cx);
+    table::init(cx);
+}

crates/ui/src/link.rs

@@ -0,0 +1,93 @@
+use gpui::{
+    div, ClickEvent, Div, ElementId, InteractiveElement, IntoElement, MouseButton, ParentElement,
+    RenderOnce, SharedString, Stateful, StatefulInteractiveElement, Styled,
+};
+
+use crate::theme::ActiveTheme as _;
+
+/// A Link element like a `<a>` tag in HTML.
+#[derive(IntoElement)]
+pub struct Link {
+    base: Stateful<Div>,
+    href: Option<SharedString>,
+    disabled: bool,
+    on_click: Option<Box<dyn Fn(&ClickEvent, &mut gpui::WindowContext) + 'static>>,
+}
+
+impl Link {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            base: div().id(id),
+            href: None,
+            on_click: None,
+            disabled: false,
+        }
+    }
+
+    pub fn href(mut self, href: impl Into<SharedString>) -> Self {
+        self.href = Some(href.into());
+        self
+    }
+
+    pub fn on_click(
+        mut self,
+        handler: impl Fn(&ClickEvent, &mut gpui::WindowContext) + 'static,
+    ) -> Self {
+        self.on_click = Some(Box::new(handler));
+        self
+    }
+
+    pub fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+}
+
+impl Styled for Link {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl ParentElement for Link {
+    fn extend(&mut self, elements: impl IntoIterator<Item = gpui::AnyElement>) {
+        self.base.extend(elements)
+    }
+}
+
+impl RenderOnce for Link {
+    fn render(self, cx: &mut gpui::WindowContext) -> impl IntoElement {
+        let href = self.href.clone();
+        let on_click = self.on_click;
+
+        div()
+            .text_color(cx.theme().link)
+            .text_decoration_1()
+            .text_decoration_color(cx.theme().link)
+            .hover(|this| {
+                this.text_color(cx.theme().link.opacity(0.8))
+                    .text_decoration_1()
+            })
+            .cursor_pointer()
+            .child(
+                self.base
+                    .active(|this| {
+                        this.text_color(cx.theme().link.opacity(0.6))
+                            .text_decoration_1()
+                    })
+                    .on_mouse_down(MouseButton::Left, |_, cx| {
+                        cx.stop_propagation();
+                    })
+                    .on_click({
+                        move |e, cx| {
+                            if let Some(href) = &href {
+                                cx.open_url(&href.clone());
+                            }
+                            if let Some(on_click) = &on_click {
+                                on_click(e, cx);
+                            }
+                        }
+                    }),
+            )
+    }
+}

crates/ui/src/list/list.rs

@@ -0,0 +1,465 @@
+use std::time::Duration;
+use std::{cell::Cell, rc::Rc};
+
+use crate::Icon;
+use crate::{
+    input::{InputEvent, TextInput},
+    scroll::{Scrollbar, ScrollbarState},
+    theme::ActiveTheme,
+    v_flex, IconName, Size,
+};
+use gpui::{
+    actions, div, prelude::FluentBuilder, uniform_list, AnyElement, AppContext, Entity,
+    FocusHandle, FocusableView, InteractiveElement, IntoElement, KeyBinding, Length,
+    ListSizingBehavior, MouseButton, ParentElement, Render, SharedString, Styled, Task,
+    UniformListScrollHandle, View, ViewContext, VisualContext, WindowContext,
+};
+use gpui::{px, ScrollStrategy};
+use smol::Timer;
+
+actions!(list, [Cancel, Confirm, SelectPrev, SelectNext]);
+
+pub fn init(cx: &mut AppContext) {
+    let context: Option<&str> = Some("List");
+    cx.bind_keys([
+        KeyBinding::new("escape", Cancel, context),
+        KeyBinding::new("enter", Confirm, context),
+        KeyBinding::new("up", SelectPrev, context),
+        KeyBinding::new("down", SelectNext, context),
+    ]);
+}
+
+/// A delegate for the List.
+#[allow(unused)]
+pub trait ListDelegate: Sized + 'static {
+    type Item: IntoElement;
+
+    /// When Query Input change, this method will be called.
+    /// You can perform search here.
+    fn perform_search(&mut self, query: &str, cx: &mut ViewContext<List<Self>>) -> Task<()> {
+        Task::Ready(Some(()))
+    }
+
+    /// Return the number of items in the list.
+    fn items_count(&self, cx: &AppContext) -> usize;
+
+    /// Render the item at the given index.
+    ///
+    /// Return None will skip the item.
+    fn render_item(&self, ix: usize, cx: &mut ViewContext<List<Self>>) -> Option<Self::Item>;
+
+    /// Return a Element to show when list is empty.
+    fn render_empty(&self, cx: &mut ViewContext<List<Self>>) -> impl IntoElement {
+        div()
+    }
+
+    /// Returns Some(AnyElement) to render the initial state of the list.
+    ///
+    /// This can be used to show a view for the list before the user has interacted with it.
+    ///
+    /// For example: The last search results, or the last selected item.
+    ///
+    /// Default is None, that means no initial state.
+    fn render_initial(&self, cx: &mut ViewContext<List<Self>>) -> Option<AnyElement> {
+        None
+    }
+
+    /// Return the confirmed index of the selected item.
+    fn confirmed_index(&self, cx: &AppContext) -> Option<usize> {
+        None
+    }
+
+    /// Set the selected index, just store the ix, don't confirm.
+    fn set_selected_index(&mut self, ix: Option<usize>, cx: &mut ViewContext<List<Self>>);
+
+    /// Set the confirm and give the selected index, this is means user have clicked the item or pressed Enter.
+    fn confirm(&mut self, ix: Option<usize>, cx: &mut ViewContext<List<Self>>) {}
+
+    /// Cancel the selection, e.g.: Pressed ESC.
+    fn cancel(&mut self, cx: &mut ViewContext<List<Self>>) {}
+}
+
+pub struct List<D: ListDelegate> {
+    focus_handle: FocusHandle,
+    delegate: D,
+    max_height: Option<Length>,
+    query_input: Option<View<TextInput>>,
+    last_query: Option<String>,
+    loading: bool,
+
+    enable_scrollbar: bool,
+    vertical_scroll_handle: UniformListScrollHandle,
+    scrollbar_state: Rc<Cell<ScrollbarState>>,
+
+    pub(crate) size: Size,
+    selected_index: Option<usize>,
+    right_clicked_index: Option<usize>,
+    _search_task: Task<()>,
+}
+
+impl<D> List<D>
+where
+    D: ListDelegate,
+{
+    pub fn new(delegate: D, cx: &mut ViewContext<Self>) -> Self {
+        let query_input = cx.new_view(|cx| {
+            TextInput::new(cx)
+                .appearance(false)
+                .prefix(|cx| Icon::new(IconName::Search).text_color(cx.theme().muted_foreground))
+                .placeholder("Search...")
+                .cleanable()
+        });
+
+        cx.subscribe(&query_input, Self::on_query_input_event)
+            .detach();
+
+        Self {
+            focus_handle: cx.focus_handle(),
+            delegate,
+            query_input: Some(query_input),
+            last_query: None,
+            selected_index: None,
+            right_clicked_index: None,
+            vertical_scroll_handle: UniformListScrollHandle::new(),
+            scrollbar_state: Rc::new(Cell::new(ScrollbarState::new())),
+            max_height: None,
+            enable_scrollbar: true,
+            loading: false,
+            size: Size::default(),
+            _search_task: Task::Ready(None),
+        }
+    }
+
+    /// Set the size
+    pub fn set_size(&mut self, size: Size, cx: &mut ViewContext<Self>) {
+        if let Some(input) = &self.query_input {
+            input.update(cx, |input, cx| {
+                input.set_size(size, cx);
+            })
+        }
+        self.size = size;
+    }
+
+    pub fn max_h(mut self, height: impl Into<Length>) -> Self {
+        self.max_height = Some(height.into());
+        self
+    }
+
+    pub fn no_scrollbar(mut self) -> Self {
+        self.enable_scrollbar = false;
+        self
+    }
+
+    pub fn no_query(mut self) -> Self {
+        self.query_input = None;
+        self
+    }
+
+    pub fn set_query_input(&mut self, query_input: View<TextInput>, cx: &mut ViewContext<Self>) {
+        cx.subscribe(&query_input, Self::on_query_input_event)
+            .detach();
+        self.query_input = Some(query_input);
+    }
+
+    pub fn delegate(&self) -> &D {
+        &self.delegate
+    }
+
+    pub fn delegate_mut(&mut self) -> &mut D {
+        &mut self.delegate
+    }
+
+    pub fn focus(&mut self, cx: &mut WindowContext) {
+        self.focus_handle(cx).focus(cx);
+    }
+
+    pub fn set_selected_index(&mut self, ix: Option<usize>, cx: &mut ViewContext<Self>) {
+        self.selected_index = ix;
+        self.delegate.set_selected_index(ix, cx);
+    }
+
+    pub fn selected_index(&self) -> Option<usize> {
+        self.selected_index
+    }
+
+    /// Set the query_input text
+    pub fn set_query(&mut self, query: &str, cx: &mut ViewContext<Self>) {
+        if let Some(query_input) = &self.query_input {
+            let query = query.to_owned();
+            query_input.update(cx, |input, cx| input.set_text(query, cx))
+        }
+    }
+
+    /// Get the query_input text
+    pub fn query(&self, cx: &mut ViewContext<Self>) -> Option<SharedString> {
+        self.query_input.as_ref().map(|input| input.read(cx).text())
+    }
+
+    fn render_scrollbar(&self, cx: &mut ViewContext<Self>) -> Option<impl IntoElement> {
+        if !self.enable_scrollbar {
+            return None;
+        }
+
+        Some(Scrollbar::uniform_scroll(
+            cx.view().entity_id(),
+            self.scrollbar_state.clone(),
+            self.vertical_scroll_handle.clone(),
+        ))
+    }
+
+    fn scroll_to_selected_item(&mut self, _cx: &mut ViewContext<Self>) {
+        if let Some(ix) = self.selected_index {
+            self.vertical_scroll_handle
+                .scroll_to_item(ix, ScrollStrategy::Top);
+        }
+    }
+
+    fn on_query_input_event(
+        &mut self,
+        _: View<TextInput>,
+        event: &InputEvent,
+        cx: &mut ViewContext<Self>,
+    ) {
+        match event {
+            InputEvent::Change(text) => {
+                let text = text.trim().to_string();
+                if Some(&text) == self.last_query.as_ref() {
+                    return;
+                }
+
+                self.set_loading(true, cx);
+                let search = self.delegate.perform_search(&text, cx);
+
+                self._search_task = cx.spawn(|this, mut cx| async move {
+                    search.await;
+
+                    let _ = this.update(&mut cx, |this, _| {
+                        this.vertical_scroll_handle
+                            .scroll_to_item(0, ScrollStrategy::Top);
+                        this.last_query = Some(text);
+                    });
+
+                    // Always wait 100ms to avoid flicker
+                    Timer::after(Duration::from_millis(100)).await;
+                    let _ = this.update(&mut cx, |this, cx| {
+                        this.set_loading(false, cx);
+                    });
+                });
+            }
+            InputEvent::PressEnter => self.on_action_confirm(&Confirm, cx),
+            _ => {}
+        }
+    }
+
+    fn set_loading(&mut self, loading: bool, cx: &mut ViewContext<Self>) {
+        self.loading = loading;
+        if let Some(input) = &self.query_input {
+            input.update(cx, |input, cx| input.set_loading(loading, cx))
+        }
+        cx.notify();
+    }
+
+    fn on_action_cancel(&mut self, _: &Cancel, cx: &mut ViewContext<Self>) {
+        self.set_selected_index(None, cx);
+        self.delegate.cancel(cx);
+        cx.notify();
+    }
+
+    fn on_action_confirm(&mut self, _: &Confirm, cx: &mut ViewContext<Self>) {
+        if self.delegate.items_count(cx) == 0 {
+            return;
+        }
+
+        self.delegate.confirm(self.selected_index, cx);
+        cx.notify();
+    }
+
+    fn on_action_select_prev(&mut self, _: &SelectPrev, cx: &mut ViewContext<Self>) {
+        if self.delegate.items_count(cx) == 0 {
+            return;
+        }
+
+        let selected_index = self.selected_index.unwrap_or(0);
+        if selected_index > 0 {
+            self.selected_index = Some(selected_index - 1);
+        } else {
+            self.selected_index = Some(self.delegate.items_count(cx) - 1);
+        }
+
+        self.delegate.set_selected_index(self.selected_index, cx);
+        self.scroll_to_selected_item(cx);
+        cx.notify();
+    }
+
+    fn on_action_select_next(&mut self, _: &SelectNext, cx: &mut ViewContext<Self>) {
+        if self.delegate.items_count(cx) == 0 {
+            return;
+        }
+
+        if let Some(selected_index) = self.selected_index {
+            if selected_index < self.delegate.items_count(cx) - 1 {
+                self.selected_index = Some(selected_index + 1);
+            } else {
+                self.selected_index = Some(0);
+            }
+        } else {
+            self.selected_index = Some(0);
+        }
+
+        self.delegate.set_selected_index(self.selected_index, cx);
+        self.scroll_to_selected_item(cx);
+        cx.notify();
+    }
+
+    fn render_list_item(&mut self, ix: usize, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        div()
+            .id("list-item")
+            .w_full()
+            .relative()
+            .children(self.delegate.render_item(ix, cx))
+            .when_some(self.selected_index, |this, selected_index| {
+                this.when(ix == selected_index, |this| {
+                    this.child(
+                        div()
+                            .absolute()
+                            .top(px(0.))
+                            .left(px(0.))
+                            .right(px(0.))
+                            .bottom(px(0.))
+                            .bg(cx.theme().list_active)
+                            .border_1()
+                            .border_color(cx.theme().list_active_border),
+                    )
+                })
+            })
+            .when(self.right_clicked_index == Some(ix), |this| {
+                this.child(
+                    div()
+                        .absolute()
+                        .top(px(0.))
+                        .left(px(0.))
+                        .right(px(0.))
+                        .bottom(px(0.))
+                        .border_1()
+                        .border_color(cx.theme().list_active_border),
+                )
+            })
+            .on_mouse_down(
+                MouseButton::Left,
+                cx.listener(move |this, _, cx| {
+                    this.right_clicked_index = None;
+                    this.selected_index = Some(ix);
+                    this.on_action_confirm(&Confirm, cx);
+                }),
+            )
+            .on_mouse_down(
+                MouseButton::Right,
+                cx.listener(move |this, _, cx| {
+                    this.right_clicked_index = Some(ix);
+                    cx.notify();
+                }),
+            )
+    }
+}
+
+impl<D> FocusableView for List<D>
+where
+    D: ListDelegate,
+{
+    fn focus_handle(&self, cx: &AppContext) -> FocusHandle {
+        if let Some(query_input) = &self.query_input {
+            query_input.focus_handle(cx)
+        } else {
+            self.focus_handle.clone()
+        }
+    }
+}
+
+impl<D> Render for List<D>
+where
+    D: ListDelegate,
+{
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let view = cx.view().clone();
+        let vertical_scroll_handle = self.vertical_scroll_handle.clone();
+        let items_count = self.delegate.items_count(cx);
+        let sizing_behavior = if self.max_height.is_some() {
+            ListSizingBehavior::Infer
+        } else {
+            ListSizingBehavior::Auto
+        };
+
+        let initial_view = if let Some(input) = &self.query_input {
+            if input.read(cx).text().is_empty() {
+                self.delegate().render_initial(cx)
+            } else {
+                None
+            }
+        } else {
+            None
+        };
+
+        v_flex()
+            .key_context("List")
+            .id("list")
+            .track_focus(&self.focus_handle)
+            .size_full()
+            .relative()
+            .overflow_hidden()
+            .on_action(cx.listener(Self::on_action_cancel))
+            .on_action(cx.listener(Self::on_action_confirm))
+            .on_action(cx.listener(Self::on_action_select_next))
+            .on_action(cx.listener(Self::on_action_select_prev))
+            .when_some(self.query_input.clone(), |this, input| {
+                this.child(
+                    div()
+                        .map(|this| match self.size {
+                            Size::Small => this.py_0().px_1p5(),
+                            _ => this.py_1().px_2(),
+                        })
+                        .border_b_1()
+                        .border_color(cx.theme().border)
+                        .child(input),
+                )
+            })
+            .map(|this| {
+                if let Some(view) = initial_view {
+                    this.child(view)
+                } else {
+                    this.child(
+                        v_flex()
+                            .flex_grow()
+                            .relative()
+                            .when_some(self.max_height, |this, h| this.max_h(h))
+                            .overflow_hidden()
+                            .when(items_count == 0, |this| {
+                                this.child(self.delegate().render_empty(cx))
+                            })
+                            .when(items_count > 0, |this| {
+                                this.child(
+                                    uniform_list(view, "uniform-list", items_count, {
+                                        move |list, visible_range, cx| {
+                                            visible_range
+                                                .map(|ix| list.render_list_item(ix, cx))
+                                                .collect::<Vec<_>>()
+                                        }
+                                    })
+                                    .flex_grow()
+                                    .with_sizing_behavior(sizing_behavior)
+                                    .track_scroll(vertical_scroll_handle)
+                                    .into_any_element(),
+                                )
+                            })
+                            .children(self.render_scrollbar(cx)),
+                    )
+                }
+            })
+            // Click out to cancel right clicked row
+            .when(self.right_clicked_index.is_some(), |this| {
+                this.on_mouse_down_out(cx.listener(|this, _, cx| {
+                    this.right_clicked_index = None;
+                    cx.notify();
+                }))
+            })
+    }
+}

crates/ui/src/list/list_item.rs

@@ -0,0 +1,169 @@
+use crate::{h_flex, theme::ActiveTheme, Disableable, Icon, IconName, Selectable, Sizable as _};
+use gpui::{
+    div, prelude::FluentBuilder as _, AnyElement, ClickEvent, Div, ElementId, InteractiveElement,
+    IntoElement, MouseButton, MouseMoveEvent, ParentElement, RenderOnce, Stateful,
+    StatefulInteractiveElement as _, Styled, WindowContext,
+};
+use smallvec::SmallVec;
+
+#[derive(IntoElement)]
+pub struct ListItem {
+    id: ElementId,
+    base: Stateful<Div>,
+    disabled: bool,
+    selected: bool,
+    confirmed: bool,
+    check_icon: Option<Icon>,
+    on_click: Option<Box<dyn Fn(&ClickEvent, &mut WindowContext) + 'static>>,
+    on_mouse_enter: Option<Box<dyn Fn(&MouseMoveEvent, &mut WindowContext) + 'static>>,
+    suffix: Option<Box<dyn Fn(&mut WindowContext) -> AnyElement + 'static>>,
+    children: SmallVec<[AnyElement; 2]>,
+}
+
+impl ListItem {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        let id: ElementId = id.into();
+        Self {
+            id: id.clone(),
+            base: h_flex().id(id).gap_x_1().py_1().px_2().text_base(),
+            disabled: false,
+            selected: false,
+            confirmed: false,
+            on_click: None,
+            on_mouse_enter: None,
+            check_icon: None,
+            suffix: None,
+            children: SmallVec::new(),
+        }
+    }
+
+    /// Set to show check icon, default is None.
+    pub fn check_icon(mut self, icon: IconName) -> Self {
+        self.check_icon = Some(Icon::new(icon));
+        self
+    }
+
+    /// Set ListItem as the selected item style.
+    pub fn selected(mut self, selected: bool) -> Self {
+        self.selected = selected;
+        self
+    }
+
+    /// Set ListItem as the confirmed item style, it will show a check icon.
+    pub fn confirmed(mut self, confirmed: bool) -> Self {
+        self.confirmed = confirmed;
+        self
+    }
+
+    pub fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+
+    /// Set the suffix element of the input field, for example a clear button.
+    pub fn suffix<F, E>(mut self, builder: F) -> Self
+    where
+        F: Fn(&mut WindowContext) -> E + 'static,
+        E: IntoElement,
+    {
+        self.suffix = Some(Box::new(move |cx| builder(cx).into_any_element()));
+        self
+    }
+
+    pub fn on_click(mut self, handler: impl Fn(&ClickEvent, &mut WindowContext) + 'static) -> Self {
+        self.on_click = Some(Box::new(handler));
+        self
+    }
+
+    pub fn on_mouse_enter(
+        mut self,
+        handler: impl Fn(&MouseMoveEvent, &mut WindowContext) + 'static,
+    ) -> Self {
+        self.on_mouse_enter = Some(Box::new(handler));
+        self
+    }
+}
+
+impl Disableable for ListItem {
+    fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+}
+
+impl Selectable for ListItem {
+    fn element_id(&self) -> &ElementId {
+        &self.id
+    }
+
+    fn selected(mut self, selected: bool) -> Self {
+        self.selected = selected;
+        self
+    }
+}
+
+impl Styled for ListItem {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl ParentElement for ListItem {
+    fn extend(&mut self, elements: impl IntoIterator<Item = gpui::AnyElement>) {
+        self.children.extend(elements);
+    }
+}
+
+impl RenderOnce for ListItem {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let is_active = self.selected || self.confirmed;
+
+        self.base
+            .text_color(cx.theme().foreground)
+            .relative()
+            .items_center()
+            .justify_between()
+            .when_some(self.on_click, |this, on_click| {
+                if !self.disabled {
+                    this.cursor_pointer()
+                        .on_mouse_down(MouseButton::Left, move |_, cx| {
+                            cx.stop_propagation();
+                        })
+                        .on_click(on_click)
+                } else {
+                    this
+                }
+            })
+            .when(is_active, |this| this.bg(cx.theme().list_active))
+            .when(!is_active && !self.disabled, |this| {
+                this.hover(|this| this.bg(cx.theme().list_hover))
+            })
+            // Mouse enter
+            .when_some(self.on_mouse_enter, |this, on_mouse_enter| {
+                if !self.disabled {
+                    this.on_mouse_move(move |ev, cx| (on_mouse_enter)(ev, cx))
+                } else {
+                    this
+                }
+            })
+            .child(
+                h_flex()
+                    .w_full()
+                    .items_center()
+                    .justify_between()
+                    .gap_x_1()
+                    .child(div().w_full().children(self.children))
+                    .when_some(self.check_icon, |this, icon| {
+                        this.child(
+                            div().w_5().items_center().justify_center().when(
+                                self.confirmed,
+                                |this| {
+                                    this.child(icon.small().text_color(cx.theme().muted_foreground))
+                                },
+                            ),
+                        )
+                    }),
+            )
+            .when_some(self.suffix, |this, suffix| this.child(suffix(cx)))
+    }
+}

crates/ui/src/list/mod.rs

@@ -0,0 +1,5 @@
+mod list;
+mod list_item;
+
+pub use list::*;
+pub use list_item::*;

crates/ui/src/modal.rs

@@ -0,0 +1,248 @@
+use std::{rc::Rc, time::Duration};
+
+use gpui::{
+    actions, anchored, div, hsla, prelude::FluentBuilder, px, relative, Animation,
+    AnimationExt as _, AnyElement, AppContext, Bounds, ClickEvent, Div, FocusHandle, Hsla,
+    InteractiveElement, IntoElement, KeyBinding, MouseButton, ParentElement, Pixels, Point,
+    RenderOnce, SharedString, Styled, WindowContext,
+};
+
+use crate::{
+    animation::cubic_bezier,
+    button::{Button, ButtonVariants as _},
+    theme::ActiveTheme as _,
+    v_flex, ContextModal, IconName, Sizable as _,
+};
+
+actions!(modal, [Escape]);
+
+const CONTEXT: &str = "Modal";
+pub fn init(cx: &mut AppContext) {
+    cx.bind_keys([KeyBinding::new("escape", Escape, Some(CONTEXT))])
+}
+
+#[derive(IntoElement)]
+pub struct Modal {
+    base: Div,
+    title: Option<AnyElement>,
+    footer: Option<AnyElement>,
+    content: Div,
+    width: Pixels,
+    max_width: Option<Pixels>,
+    margin_top: Option<Pixels>,
+
+    on_close: Rc<dyn Fn(&ClickEvent, &mut WindowContext) + 'static>,
+    show_close: bool,
+    overlay: bool,
+    keyboard: bool,
+
+    /// This will be change when open the modal, the focus handle is create when open the modal.
+    pub(crate) focus_handle: FocusHandle,
+    pub(crate) layer_ix: usize,
+    pub(crate) overlay_visible: bool,
+}
+
+pub(crate) fn overlay_color(overlay: bool, cx: &WindowContext) -> Hsla {
+    if !overlay {
+        return hsla(0., 0., 0., 0.);
+    }
+
+    if cx.theme().mode.is_dark() {
+        hsla(0., 1., 1., 0.06)
+    } else {
+        hsla(0., 0., 0., 0.06)
+    }
+}
+
+impl Modal {
+    pub fn new(cx: &mut WindowContext) -> Self {
+        let base = v_flex()
+            .bg(cx.theme().background)
+            .border_1()
+            .border_color(cx.theme().border)
+            .rounded_lg()
+            .shadow_xl()
+            .min_h_48()
+            .p_4()
+            .gap_4();
+
+        Self {
+            base,
+            focus_handle: cx.focus_handle(),
+            title: None,
+            footer: None,
+            content: v_flex(),
+            margin_top: None,
+            width: px(480.),
+            max_width: None,
+            overlay: true,
+            keyboard: true,
+            layer_ix: 0,
+            overlay_visible: true,
+            on_close: Rc::new(|_, _| {}),
+            show_close: true,
+        }
+    }
+
+    /// Sets the title of the modal.
+    pub fn title(mut self, title: impl IntoElement) -> Self {
+        self.title = Some(title.into_any_element());
+        self
+    }
+
+    /// Set the footer of the modal.
+    pub fn footer(mut self, footer: impl IntoElement) -> Self {
+        self.footer = Some(footer.into_any_element());
+        self
+    }
+
+    /// Sets the callback for when the modal is closed.
+    pub fn on_close(
+        mut self,
+        on_close: impl Fn(&ClickEvent, &mut WindowContext) + 'static,
+    ) -> Self {
+        self.on_close = Rc::new(on_close);
+        self
+    }
+
+    /// Sets the false to hide close icon, default: true
+    pub fn show_close(mut self, show_close: bool) -> Self {
+        self.show_close = show_close;
+        self
+    }
+
+    /// Set the top offset of the modal, defaults to None, will use the 1/10 of the viewport height.
+    pub fn margin_top(mut self, margin_top: Pixels) -> Self {
+        self.margin_top = Some(margin_top);
+        self
+    }
+
+    /// Sets the width of the modal, defaults to 480px.
+    pub fn width(mut self, width: Pixels) -> Self {
+        self.width = width;
+        self
+    }
+
+    /// Set the maximum width of the modal, defaults to `None`.
+    pub fn max_w(mut self, max_width: Pixels) -> Self {
+        self.max_width = Some(max_width);
+        self
+    }
+
+    /// Set the overlay of the modal, defaults to `true`.
+    pub fn overlay(mut self, overlay: bool) -> Self {
+        self.overlay = overlay;
+        self
+    }
+
+    /// Set whether to support keyboard esc to close the modal, defaults to `true`.
+    pub fn keyboard(mut self, keyboard: bool) -> Self {
+        self.keyboard = keyboard;
+        self
+    }
+
+    pub(crate) fn has_overlay(&self) -> bool {
+        self.overlay
+    }
+}
+
+impl ParentElement for Modal {
+    fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
+        self.content.extend(elements);
+    }
+}
+
+impl Styled for Modal {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl RenderOnce for Modal {
+    fn render(self, cx: &mut WindowContext) -> impl gpui::IntoElement {
+        let layer_ix = self.layer_ix;
+        let on_close = self.on_close.clone();
+        let view_size = cx.viewport_size();
+        let bounds = Bounds {
+            origin: Point::default(),
+            size: view_size,
+        };
+        let offset_top = px(layer_ix as f32 * 16.);
+        let y = self.margin_top.unwrap_or(view_size.height / 10.) + offset_top;
+        let x = bounds.center().x - self.width / 2.;
+
+        anchored().snap_to_window().child(
+            div()
+                .occlude()
+                .w(view_size.width)
+                .h(view_size.height)
+                .when(self.overlay_visible, |this| {
+                    this.bg(overlay_color(self.overlay, cx))
+                })
+                .when(self.overlay, |this| {
+                    this.on_mouse_down(MouseButton::Left, {
+                        let on_close = self.on_close.clone();
+                        move |_, cx| {
+                            on_close(&ClickEvent::default(), cx);
+                            cx.close_modal();
+                        }
+                    })
+                })
+                .child(
+                    self.base
+                        .id(SharedString::from(format!("modal-{layer_ix}")))
+                        .key_context(CONTEXT)
+                        .track_focus(&self.focus_handle)
+                        .when(self.keyboard, |this| {
+                            this.on_action({
+                                let on_close = self.on_close.clone();
+                                move |_: &Escape, cx| {
+                                    // FIXME:
+                                    //
+                                    // Here some Modal have no focus_handle, so it will not work will Escape key.
+                                    // But by now, we `cx.close_modal()` going to close the last active model, so the Escape is unexpected to work.
+                                    on_close(&ClickEvent::default(), cx);
+                                    cx.close_modal();
+                                }
+                            })
+                        })
+                        .absolute()
+                        .occlude()
+                        .relative()
+                        .left(x)
+                        .top(y)
+                        .w(self.width)
+                        .when_some(self.max_width, |this, w| this.max_w(w))
+                        .when_some(self.title, |this, title| {
+                            this.child(div().line_height(relative(1.)).child(title))
+                        })
+                        .when(self.show_close, |this| {
+                            this.child(
+                                Button::new(SharedString::from(format!("modal-close-{layer_ix}")))
+                                    .absolute()
+                                    .top_2()
+                                    .right_2()
+                                    .small()
+                                    .ghost()
+                                    .icon(IconName::Close)
+                                    .on_click(move |_, cx| {
+                                        on_close(&ClickEvent::default(), cx);
+                                        cx.close_modal();
+                                    }),
+                            )
+                        })
+                        .child(self.content)
+                        .children(self.footer)
+                        .with_animation(
+                            "slide-down",
+                            Animation::new(Duration::from_secs_f64(0.25))
+                                .with_easing(cubic_bezier(0.32, 0.72, 0., 1.)),
+                            move |this, delta| {
+                                let y_offset = px(0.) + delta * px(30.);
+                                this.top(y + y_offset).opacity(delta)
+                            },
+                        ),
+                ),
+        )
+    }
+}

crates/ui/src/notification.rs

@@ -0,0 +1,369 @@
+use std::{any::TypeId, collections::VecDeque, sync::Arc, time::Duration};
+
+use gpui::{
+    div, prelude::FluentBuilder, px, Animation, AnimationExt, ClickEvent, DismissEvent, ElementId,
+    EventEmitter, InteractiveElement as _, IntoElement, ParentElement as _, Render, SharedString,
+    StatefulInteractiveElement, Styled, View, ViewContext, VisualContext, WindowContext,
+};
+use smol::Timer;
+
+use crate::{
+    animation::cubic_bezier,
+    button::{Button, ButtonVariants as _},
+    h_flex,
+    theme::ActiveTheme as _,
+    v_flex, Icon, IconName, Sizable as _, StyledExt,
+};
+
+pub enum NotificationType {
+    Info,
+    Success,
+    Warning,
+    Error,
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub(crate) enum NotificationId {
+    Id(TypeId),
+    IdAndElementId(TypeId, ElementId),
+}
+
+impl From<TypeId> for NotificationId {
+    fn from(type_id: TypeId) -> Self {
+        Self::Id(type_id)
+    }
+}
+
+impl From<(TypeId, ElementId)> for NotificationId {
+    fn from((type_id, id): (TypeId, ElementId)) -> Self {
+        Self::IdAndElementId(type_id, id)
+    }
+}
+
+/// A notification element.
+pub struct Notification {
+    /// The id is used make the notification unique.
+    /// Then you push a notification with the same id, the previous notification will be replaced.
+    ///
+    /// None means the notification will be added to the end of the list.
+    id: NotificationId,
+    type_: NotificationType,
+    title: Option<SharedString>,
+    message: SharedString,
+    icon: Option<Icon>,
+    autohide: bool,
+    on_click: Option<Arc<dyn Fn(&ClickEvent, &mut WindowContext)>>,
+    closing: bool,
+}
+
+impl From<String> for Notification {
+    fn from(s: String) -> Self {
+        Self::new(s)
+    }
+}
+
+impl From<SharedString> for Notification {
+    fn from(s: SharedString) -> Self {
+        Self::new(s)
+    }
+}
+
+impl From<&'static str> for Notification {
+    fn from(s: &'static str) -> Self {
+        Self::new(s)
+    }
+}
+
+impl From<(NotificationType, &'static str)> for Notification {
+    fn from((type_, content): (NotificationType, &'static str)) -> Self {
+        Self::new(content).with_type(type_)
+    }
+}
+
+impl From<(NotificationType, SharedString)> for Notification {
+    fn from((type_, content): (NotificationType, SharedString)) -> Self {
+        Self::new(content).with_type(type_)
+    }
+}
+
+struct DefaultIdType;
+impl Notification {
+    /// Create a new notification with the given content.
+    ///
+    /// default width is 320px.
+    pub fn new(message: impl Into<SharedString>) -> Self {
+        let id: SharedString = uuid::Uuid::new_v4().to_string().into();
+        let id = (TypeId::of::<DefaultIdType>(), id.into());
+
+        Self {
+            id: id.into(),
+            title: None,
+            message: message.into(),
+            type_: NotificationType::Info,
+            icon: None,
+            autohide: true,
+            on_click: None,
+            closing: false,
+        }
+    }
+
+    pub fn info(message: impl Into<SharedString>) -> Self {
+        Self::new(message).with_type(NotificationType::Info)
+    }
+
+    pub fn success(message: impl Into<SharedString>) -> Self {
+        Self::new(message).with_type(NotificationType::Success)
+    }
+
+    pub fn warning(message: impl Into<SharedString>) -> Self {
+        Self::new(message).with_type(NotificationType::Warning)
+    }
+
+    pub fn error(message: impl Into<SharedString>) -> Self {
+        Self::new(message).with_type(NotificationType::Error)
+    }
+
+    /// Set the type for unique identification of the notification.
+    ///
+    /// ```rs
+    /// struct MyNotificationKind;
+    /// let notification = Notification::new("Hello").id::<MyNotificationKind>();
+    /// ```
+    pub fn id<T: Sized + 'static>(mut self) -> Self {
+        self.id = TypeId::of::<T>().into();
+        self
+    }
+
+    /// Set the type and id of the notification, used to uniquely identify the notification.
+    pub fn id1<T: Sized + 'static>(mut self, key: impl Into<ElementId>) -> Self {
+        self.id = (TypeId::of::<T>(), key.into()).into();
+        self
+    }
+
+    /// Set the title of the notification, default is None.
+    ///
+    /// If title is None, the notification will not have a title.
+    pub fn title(mut self, title: impl Into<SharedString>) -> Self {
+        self.title = Some(title.into());
+        self
+    }
+
+    /// Set the icon of the notification.
+    ///
+    /// If icon is None, the notification will use the default icon of the type.
+    pub fn icon(mut self, icon: impl Into<Icon>) -> Self {
+        self.icon = Some(icon.into());
+        self
+    }
+
+    /// Set the type of the notification, default is NotificationType::Info.
+    pub fn with_type(mut self, type_: NotificationType) -> Self {
+        self.type_ = type_;
+        self
+    }
+
+    /// Set the auto hide of the notification, default is true.
+    pub fn autohide(mut self, autohide: bool) -> Self {
+        self.autohide = autohide;
+        self
+    }
+
+    /// Set the click callback of the notification.
+    pub fn on_click(
+        mut self,
+        on_click: impl Fn(&ClickEvent, &mut WindowContext) + 'static,
+    ) -> Self {
+        self.on_click = Some(Arc::new(on_click));
+        self
+    }
+
+    fn dismiss(&mut self, _: &ClickEvent, cx: &mut ViewContext<Self>) {
+        self.closing = true;
+        cx.notify();
+
+        // Dismiss the notification after 0.15s to show the animation.
+        cx.spawn(|view, mut cx| async move {
+            Timer::after(Duration::from_secs_f32(0.15)).await;
+            cx.update(|cx| {
+                if let Some(view) = view.upgrade() {
+                    view.update(cx, |view, cx| {
+                        view.closing = false;
+                        cx.emit(DismissEvent);
+                    });
+                }
+            })
+        })
+        .detach()
+    }
+}
+impl EventEmitter<DismissEvent> for Notification {}
+impl FluentBuilder for Notification {}
+impl Render for Notification {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let closing = self.closing;
+        let icon = match self.icon.clone() {
+            Some(icon) => icon,
+            None => match self.type_ {
+                NotificationType::Info => Icon::new(IconName::Info).text_color(crate::blue_500()),
+                NotificationType::Success => {
+                    Icon::new(IconName::CircleCheck).text_color(crate::green_500())
+                }
+                NotificationType::Warning => {
+                    Icon::new(IconName::TriangleAlert).text_color(crate::yellow_500())
+                }
+                NotificationType::Error => {
+                    Icon::new(IconName::CircleX).text_color(crate::red_500())
+                }
+            },
+        };
+
+        div()
+            .id("notification")
+            .group("")
+            .occlude()
+            .relative()
+            .w_96()
+            .border_1()
+            .border_color(cx.theme().border)
+            .bg(cx.theme().popover)
+            .rounded_md()
+            .shadow_md()
+            .py_2()
+            .px_4()
+            .gap_3()
+            .child(div().absolute().top_3().left_4().child(icon))
+            .child(
+                v_flex()
+                    .pl_6()
+                    .gap_1()
+                    .when_some(self.title.clone(), |this, title| {
+                        this.child(div().text_sm().font_semibold().child(title))
+                    })
+                    .overflow_hidden()
+                    .child(div().text_sm().child(self.message.clone())),
+            )
+            .when_some(self.on_click.clone(), |this, on_click| {
+                this.cursor_pointer()
+                    .on_click(cx.listener(move |view, event, cx| {
+                        view.dismiss(event, cx);
+                        on_click(event, cx);
+                    }))
+            })
+            .when(!self.autohide, |this| {
+                this.child(
+                    h_flex()
+                        .absolute()
+                        .top_1()
+                        .right_1()
+                        .invisible()
+                        .group_hover("", |this| this.visible())
+                        .child(
+                            Button::new("close")
+                                .icon(IconName::Close)
+                                .ghost()
+                                .xsmall()
+                                .on_click(cx.listener(Self::dismiss)),
+                        ),
+                )
+            })
+            .with_animation(
+                ElementId::NamedInteger("slide-down".into(), closing as usize),
+                Animation::new(Duration::from_secs_f64(0.15))
+                    .with_easing(cubic_bezier(0.4, 0., 0.2, 1.)),
+                move |this, delta| {
+                    if closing {
+                        let x_offset = px(0.) + delta * px(45.);
+                        this.left(px(0.) + x_offset).opacity(1. - delta)
+                    } else {
+                        let y_offset = px(-45.) + delta * px(45.);
+                        this.top(px(0.) + y_offset).opacity(delta)
+                    }
+                },
+            )
+    }
+}
+
+/// A list of notifications.
+pub struct NotificationList {
+    /// Notifications that will be auto hidden.
+    pub(crate) notifications: VecDeque<View<Notification>>,
+    expanded: bool,
+}
+
+impl NotificationList {
+    pub fn new(_cx: &mut ViewContext<Self>) -> Self {
+        Self {
+            notifications: VecDeque::new(),
+            expanded: false,
+        }
+    }
+
+    pub fn push(&mut self, notification: impl Into<Notification>, cx: &mut ViewContext<Self>) {
+        let notification = notification.into();
+        let id = notification.id.clone();
+        let autohide = notification.autohide;
+
+        // Remove the notification by id, for keep unique.
+        self.notifications.retain(|note| note.read(cx).id != id);
+
+        let notification = cx.new_view(|_| notification);
+        cx.subscribe(&notification, move |view, _, _: &DismissEvent, cx| {
+            view.notifications.retain(|note| id != note.read(cx).id);
+        })
+        .detach();
+
+        self.notifications.push_back(notification.clone());
+        if autohide {
+            // Sleep for 5 seconds to autohide the notification
+            cx.spawn(|_, mut cx| async move {
+                Timer::after(Duration::from_secs(5)).await;
+
+                if let Err(err) = notification
+                    .update(&mut cx, |note, cx| note.dismiss(&ClickEvent::default(), cx))
+                {
+                    println!("failed to auto hide notification: {:?}", err);
+                }
+            })
+            .detach();
+        }
+        cx.notify();
+    }
+
+    pub fn clear(&mut self, cx: &mut ViewContext<Self>) {
+        self.notifications.clear();
+        cx.notify();
+    }
+
+    pub fn notifications(&self) -> Vec<View<Notification>> {
+        self.notifications.iter().cloned().collect()
+    }
+}
+
+impl Render for NotificationList {
+    fn render(&mut self, cx: &mut gpui::ViewContext<Self>) -> impl IntoElement {
+        let size = cx.viewport_size();
+        let items = self.notifications.iter().rev().take(10).rev().cloned();
+
+        div()
+            .absolute()
+            .flex()
+            .top_4()
+            .bottom_4()
+            .right_4()
+            .justify_end()
+            .child(
+                v_flex()
+                    .id("notification-list")
+                    .absolute()
+                    .relative()
+                    .right_0()
+                    .h(size.height - px(8.))
+                    .on_hover(cx.listener(|view, hovered, cx| {
+                        view.expanded = *hovered;
+                        cx.notify()
+                    }))
+                    .gap_3()
+                    .children(items),
+            )
+    }
+}

crates/ui/src/number_input.rs

@@ -0,0 +1,168 @@
+use gpui::{
+    actions, AppContext, EventEmitter, FocusHandle, FocusableView, InteractiveElement, IntoElement,
+    KeyBinding, ParentElement, Render, SharedString, Styled, Subscription, View, ViewContext,
+    VisualContext,
+};
+use regex::Regex;
+
+use crate::{
+    button::{Button, ButtonVariants as _},
+    h_flex,
+    input::{InputEvent, TextInput},
+    prelude::FluentBuilder,
+    theme::ActiveTheme,
+    IconName, Sizable, Size, StyledExt,
+};
+
+actions!(number_input, [Increment, Decrement]);
+
+const KEY_CONTENT: &str = "NumberInput";
+
+pub fn init(cx: &mut AppContext) {
+    cx.bind_keys(vec![
+        KeyBinding::new("up", Increment, Some(KEY_CONTENT)),
+        KeyBinding::new("down", Decrement, Some(KEY_CONTENT)),
+    ]);
+}
+
+pub struct NumberInput {
+    input: View<TextInput>,
+    _subscriptions: Vec<Subscription>,
+}
+
+impl NumberInput {
+    pub fn new(cx: &mut ViewContext<Self>) -> Self {
+        // Default pattern for the number input.
+        let pattern = Regex::new(r"^-?(\d+)?\.?(\d+)?$").unwrap();
+
+        let input = cx.new_view(|cx| TextInput::new(cx).pattern(pattern).appearance(false));
+
+        let _subscriptions = vec![cx.subscribe(&input, |_, _, event: &InputEvent, cx| {
+            cx.emit(NumberInputEvent::Input(event.clone()));
+        })];
+
+        Self {
+            input,
+            _subscriptions,
+        }
+    }
+
+    pub fn placeholder(
+        self,
+        placeholder: impl Into<SharedString>,
+        cx: &mut ViewContext<Self>,
+    ) -> Self {
+        self.input
+            .update(cx, |input, _| input.set_placeholder(placeholder));
+        self
+    }
+
+    pub fn set_placeholder(&self, text: impl Into<SharedString>, cx: &mut ViewContext<Self>) {
+        self.input.update(cx, |input, _| {
+            input.set_placeholder(text);
+        });
+    }
+
+    pub fn pattern(self, pattern: regex::Regex, cx: &mut ViewContext<Self>) -> Self {
+        self.input.update(cx, |input, _| input.set_pattern(pattern));
+        self
+    }
+
+    pub fn set_size(self, size: Size, cx: &mut ViewContext<Self>) -> Self {
+        self.input.update(cx, |input, cx| input.set_size(size, cx));
+        self
+    }
+
+    pub fn small(self, cx: &mut ViewContext<Self>) -> Self {
+        self.set_size(Size::Small, cx)
+    }
+
+    pub fn xsmall(self, cx: &mut ViewContext<Self>) -> Self {
+        self.set_size(Size::XSmall, cx)
+    }
+
+    pub fn large(self, cx: &mut ViewContext<Self>) -> Self {
+        self.set_size(Size::Large, cx)
+    }
+
+    pub fn set_value(&self, text: impl Into<SharedString>, cx: &mut ViewContext<Self>) {
+        self.input.update(cx, |input, cx| input.set_text(text, cx))
+    }
+
+    pub fn set_disabled(&self, disabled: bool, cx: &mut ViewContext<Self>) {
+        self.input
+            .update(cx, |input, cx| input.set_disabled(disabled, cx));
+    }
+
+    pub fn increment(&mut self, cx: &mut ViewContext<Self>) {
+        self.handle_increment(&Increment, cx);
+    }
+
+    pub fn decrement(&mut self, cx: &mut ViewContext<Self>) {
+        self.handle_decrement(&Decrement, cx);
+    }
+
+    fn handle_increment(&mut self, _: &Increment, cx: &mut ViewContext<Self>) {
+        self.on_step(StepAction::Increment, cx);
+    }
+
+    fn handle_decrement(&mut self, _: &Decrement, cx: &mut ViewContext<Self>) {
+        self.on_step(StepAction::Decrement, cx);
+    }
+
+    fn on_step(&mut self, action: StepAction, cx: &mut ViewContext<Self>) {
+        cx.emit(NumberInputEvent::Step(action));
+    }
+}
+
+impl FocusableView for NumberInput {
+    fn focus_handle(&self, cx: &AppContext) -> FocusHandle {
+        self.input.focus_handle(cx)
+    }
+}
+
+pub enum StepAction {
+    Decrement,
+    Increment,
+}
+
+pub enum NumberInputEvent {
+    Input(InputEvent),
+    Step(StepAction),
+}
+
+impl EventEmitter<NumberInputEvent> for NumberInput {}
+
+impl Render for NumberInput {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let focused = self.input.focus_handle(cx).is_focused(cx);
+
+        h_flex()
+            .key_context(KEY_CONTENT)
+            .on_action(cx.listener(Self::handle_increment))
+            .on_action(cx.listener(Self::handle_decrement))
+            .flex_1()
+            .px_1()
+            .gap_x_3()
+            .bg(cx.theme().background)
+            .border_color(cx.theme().border)
+            .border_1()
+            .rounded_md()
+            .when(focused, |this| this.outline(cx))
+            .child(
+                Button::new("minus")
+                    .ghost()
+                    .xsmall()
+                    .icon(IconName::Minus)
+                    .on_click(cx.listener(|this, _, cx| this.on_step(StepAction::Decrement, cx))),
+            )
+            .child(self.input.clone())
+            .child(
+                Button::new("plus")
+                    .ghost()
+                    .xsmall()
+                    .icon(IconName::Plus)
+                    .on_click(cx.listener(|this, _, cx| this.on_step(StepAction::Increment, cx))),
+            )
+    }
+}

crates/ui/src/popover.rs

@@ -0,0 +1,408 @@
+use gpui::{
+    actions, anchored, deferred, div, prelude::FluentBuilder as _, px, AnchorCorner, AnyElement,
+    AppContext, Bounds, DismissEvent, DispatchPhase, Element, ElementId, EventEmitter, FocusHandle,
+    FocusableView, GlobalElementId, Hitbox, InteractiveElement as _, IntoElement, KeyBinding,
+    LayoutId, ManagedView, MouseButton, MouseDownEvent, ParentElement, Pixels, Point, Render,
+    Style, StyleRefinement, Styled, View, ViewContext, VisualContext, WindowContext,
+};
+use std::{cell::RefCell, rc::Rc};
+
+use crate::{Selectable, StyledExt as _};
+
+const CONTEXT: &str = "Popover";
+
+actions!(popover, [Escape]);
+
+pub fn init(cx: &mut AppContext) {
+    cx.bind_keys([KeyBinding::new("escape", Escape, Some(CONTEXT))])
+}
+
+pub struct PopoverContent {
+    focus_handle: FocusHandle,
+    content: Rc<dyn Fn(&mut ViewContext<Self>) -> AnyElement>,
+    max_width: Option<Pixels>,
+}
+
+impl PopoverContent {
+    pub fn new<B>(cx: &mut WindowContext, content: B) -> Self
+    where
+        B: Fn(&mut ViewContext<Self>) -> AnyElement + 'static,
+    {
+        let focus_handle = cx.focus_handle();
+
+        Self {
+            focus_handle,
+            content: Rc::new(content),
+            max_width: None,
+        }
+    }
+
+    pub fn max_w(mut self, max_width: Pixels) -> Self {
+        self.max_width = Some(max_width);
+        self
+    }
+}
+impl EventEmitter<DismissEvent> for PopoverContent {}
+
+impl FocusableView for PopoverContent {
+    fn focus_handle(&self, _cx: &AppContext) -> FocusHandle {
+        self.focus_handle.clone()
+    }
+}
+
+impl Render for PopoverContent {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        div()
+            .track_focus(&self.focus_handle)
+            .key_context(CONTEXT)
+            .on_action(cx.listener(|_, _: &Escape, cx| cx.emit(DismissEvent)))
+            .p_2()
+            .when_some(self.max_width, |this, v| this.max_w(v))
+            .child(self.content.clone()(cx))
+    }
+}
+
+pub struct Popover<M: ManagedView> {
+    id: ElementId,
+    anchor: AnchorCorner,
+    trigger: Option<Box<dyn FnOnce(bool, &WindowContext) -> AnyElement + 'static>>,
+    content: Option<Rc<dyn Fn(&mut WindowContext) -> View<M> + 'static>>,
+    /// Style for trigger element.
+    /// This is used for hotfix the trigger element style to support w_full.
+    trigger_style: Option<StyleRefinement>,
+    mouse_button: MouseButton,
+    no_style: bool,
+}
+
+impl<M> Popover<M>
+where
+    M: ManagedView,
+{
+    /// Create a new Popover with `view` mode.
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            id: id.into(),
+            anchor: AnchorCorner::TopLeft,
+            trigger: None,
+            trigger_style: None,
+            content: None,
+            mouse_button: MouseButton::Left,
+            no_style: false,
+        }
+    }
+
+    pub fn anchor(mut self, anchor: AnchorCorner) -> Self {
+        self.anchor = anchor;
+        self
+    }
+
+    /// Set the mouse button to trigger the popover, default is `MouseButton::Left`.
+    pub fn mouse_button(mut self, mouse_button: MouseButton) -> Self {
+        self.mouse_button = mouse_button;
+        self
+    }
+
+    pub fn trigger<T>(mut self, trigger: T) -> Self
+    where
+        T: Selectable + IntoElement + 'static,
+    {
+        self.trigger = Some(Box::new(|is_open, _| {
+            trigger.selected(is_open).into_any_element()
+        }));
+        self
+    }
+
+    pub fn trigger_style(mut self, style: StyleRefinement) -> Self {
+        self.trigger_style = Some(style);
+        self
+    }
+
+    /// Set the content of the popover.
+    ///
+    /// The `content` is a closure that returns an `AnyElement`.
+    pub fn content<C>(mut self, content: C) -> Self
+    where
+        C: Fn(&mut WindowContext) -> View<M> + 'static,
+    {
+        self.content = Some(Rc::new(content));
+        self
+    }
+
+    /// Set whether the popover no style, default is `false`.
+    ///
+    /// If no style:
+    ///
+    /// - The popover will not have a bg, border, shadow, or padding.
+    /// - The click out of the popover will not dismiss it.
+    pub fn no_style(mut self) -> Self {
+        self.no_style = true;
+        self
+    }
+
+    fn render_trigger(&mut self, is_open: bool, cx: &mut WindowContext) -> AnyElement {
+        let Some(trigger) = self.trigger.take() else {
+            return div().into_any_element();
+        };
+
+        (trigger)(is_open, cx)
+    }
+
+    fn resolved_corner(&self, bounds: Bounds<Pixels>) -> Point<Pixels> {
+        match self.anchor {
+            AnchorCorner::TopLeft => AnchorCorner::BottomLeft,
+            AnchorCorner::TopRight => AnchorCorner::BottomRight,
+            AnchorCorner::BottomLeft => AnchorCorner::TopLeft,
+            AnchorCorner::BottomRight => AnchorCorner::TopRight,
+        }
+        .corner(bounds)
+    }
+
+    fn with_element_state<R>(
+        &mut self,
+        id: &GlobalElementId,
+        cx: &mut WindowContext,
+        f: impl FnOnce(&mut Self, &mut PopoverElementState<M>, &mut WindowContext) -> R,
+    ) -> R {
+        cx.with_optional_element_state::<PopoverElementState<M>, _>(
+            Some(id),
+            |element_state, cx| {
+                let mut element_state = element_state.unwrap().unwrap_or_default();
+                let result = f(self, &mut element_state, cx);
+                (result, Some(element_state))
+            },
+        )
+    }
+}
+
+impl<M> IntoElement for Popover<M>
+where
+    M: ManagedView,
+{
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+pub struct PopoverElementState<M> {
+    trigger_layout_id: Option<LayoutId>,
+    popover_layout_id: Option<LayoutId>,
+    popover_element: Option<AnyElement>,
+    trigger_element: Option<AnyElement>,
+    content_view: Rc<RefCell<Option<View<M>>>>,
+    /// Trigger bounds for positioning the popover.
+    trigger_bounds: Option<Bounds<Pixels>>,
+}
+
+impl<M> Default for PopoverElementState<M> {
+    fn default() -> Self {
+        Self {
+            trigger_layout_id: None,
+            popover_layout_id: None,
+            popover_element: None,
+            trigger_element: None,
+            content_view: Rc::new(RefCell::new(None)),
+            trigger_bounds: None,
+        }
+    }
+}
+
+pub struct PrepaintState {
+    hitbox: Hitbox,
+    /// Trigger bounds for limit a rect to handle mouse click.
+    trigger_bounds: Option<Bounds<Pixels>>,
+}
+
+impl<M: ManagedView> Element for Popover<M> {
+    type RequestLayoutState = PopoverElementState<M>;
+    type PrepaintState = PrepaintState;
+
+    fn id(&self) -> Option<ElementId> {
+        Some(self.id.clone())
+    }
+
+    fn request_layout(
+        &mut self,
+        id: Option<&gpui::GlobalElementId>,
+        cx: &mut WindowContext,
+    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
+        let mut style = Style::default();
+
+        // FIXME: Remove this and find a better way to handle this.
+        // Apply trigger style, for support w_full for trigger.
+        //
+        // If remove this, the trigger will not support w_full.
+        if let Some(trigger_style) = self.trigger_style.clone() {
+            if let Some(width) = trigger_style.size.width {
+                style.size.width = width;
+            }
+            if let Some(display) = trigger_style.display {
+                style.display = display;
+            }
+        }
+
+        self.with_element_state(id.unwrap(), cx, |view, element_state, cx| {
+            let mut popover_layout_id = None;
+            let mut popover_element = None;
+            let mut is_open = false;
+
+            if let Some(content_view) = element_state.content_view.borrow_mut().as_mut() {
+                is_open = true;
+
+                let mut anchored = anchored()
+                    .snap_to_window_with_margin(px(8.))
+                    .anchor(view.anchor);
+                if let Some(trigger_bounds) = element_state.trigger_bounds {
+                    anchored = anchored.position(view.resolved_corner(trigger_bounds));
+                }
+
+                let mut element = {
+                    let content_view_mut = element_state.content_view.clone();
+                    let anchor = view.anchor;
+                    let no_style = view.no_style;
+                    deferred(
+                        anchored.child(
+                            div()
+                                .size_full()
+                                .occlude()
+                                .when(!no_style, |this| this.popover_style(cx))
+                                .map(|this| match anchor {
+                                    AnchorCorner::TopLeft | AnchorCorner::TopRight => {
+                                        this.top_1p5()
+                                    }
+                                    AnchorCorner::BottomLeft | AnchorCorner::BottomRight => {
+                                        this.bottom_1p5()
+                                    }
+                                })
+                                .child(content_view.clone())
+                                .when(!no_style, |this| {
+                                    this.on_mouse_down_out(move |_, cx| {
+                                        // Update the element_state.content_view to `None`,
+                                        // so that the `paint`` method will not paint it.
+                                        *content_view_mut.borrow_mut() = None;
+                                        cx.refresh();
+                                    })
+                                }),
+                        ),
+                    )
+                    .with_priority(1)
+                    .into_any()
+                };
+
+                popover_layout_id = Some(element.request_layout(cx));
+                popover_element = Some(element);
+            }
+
+            let mut trigger_element = view.render_trigger(is_open, cx);
+            let trigger_layout_id = trigger_element.request_layout(cx);
+
+            let layout_id = cx.request_layout(
+                style,
+                Some(trigger_layout_id).into_iter().chain(popover_layout_id),
+            );
+
+            (
+                layout_id,
+                PopoverElementState {
+                    trigger_layout_id: Some(trigger_layout_id),
+                    popover_layout_id,
+                    popover_element,
+                    trigger_element: Some(trigger_element),
+                    ..Default::default()
+                },
+            )
+        })
+    }
+
+    fn prepaint(
+        &mut self,
+        _id: Option<&gpui::GlobalElementId>,
+        _bounds: gpui::Bounds<gpui::Pixels>,
+        request_layout: &mut Self::RequestLayoutState,
+        cx: &mut WindowContext,
+    ) -> Self::PrepaintState {
+        if let Some(element) = &mut request_layout.trigger_element {
+            element.prepaint(cx);
+        }
+        if let Some(element) = &mut request_layout.popover_element {
+            element.prepaint(cx);
+        }
+
+        let trigger_bounds = request_layout
+            .trigger_layout_id
+            .map(|id| cx.layout_bounds(id));
+
+        // Prepare the popover, for get the bounds of it for open window size.
+        let _ = request_layout
+            .popover_layout_id
+            .map(|id| cx.layout_bounds(id));
+
+        let hitbox = cx.insert_hitbox(trigger_bounds.unwrap_or_default(), false);
+
+        PrepaintState {
+            trigger_bounds,
+            hitbox,
+        }
+    }
+
+    fn paint(
+        &mut self,
+        id: Option<&GlobalElementId>,
+        _bounds: Bounds<Pixels>,
+        request_layout: &mut Self::RequestLayoutState,
+        prepaint: &mut Self::PrepaintState,
+        cx: &mut WindowContext,
+    ) {
+        self.with_element_state(id.unwrap(), cx, |this, element_state, cx| {
+            element_state.trigger_bounds = prepaint.trigger_bounds;
+
+            if let Some(mut element) = request_layout.trigger_element.take() {
+                element.paint(cx);
+            }
+
+            if let Some(mut element) = request_layout.popover_element.take() {
+                element.paint(cx);
+                return;
+            }
+
+            // When mouse click down in the trigger bounds, open the popover.
+            let Some(content_build) = this.content.take() else {
+                return;
+            };
+            let old_content_view = element_state.content_view.clone();
+            let hitbox_id = prepaint.hitbox.id;
+            let mouse_button = this.mouse_button;
+            cx.on_mouse_event(move |event: &MouseDownEvent, phase, cx| {
+                if phase == DispatchPhase::Bubble
+                    && event.button == mouse_button
+                    && hitbox_id.is_hovered(cx)
+                {
+                    cx.stop_propagation();
+                    cx.prevent_default();
+
+                    let new_content_view = (content_build)(cx);
+                    let old_content_view1 = old_content_view.clone();
+
+                    let previous_focus_handle = cx.focused();
+
+                    cx.subscribe(&new_content_view, move |modal, _: &DismissEvent, cx| {
+                        if modal.focus_handle(cx).contains_focused(cx) {
+                            if let Some(previous_focus_handle) = previous_focus_handle.as_ref() {
+                                cx.focus(previous_focus_handle);
+                            }
+                        }
+                        *old_content_view1.borrow_mut() = None;
+
+                        cx.refresh();
+                    })
+                    .detach();
+
+                    cx.focus_view(&new_content_view);
+                    *old_content_view.borrow_mut() = Some(new_content_view);
+                    cx.refresh();
+                }
+            });
+        });
+    }
+}

crates/ui/src/popup_menu.rs

@@ -0,0 +1,778 @@
+use std::cell::Cell;
+use std::ops::Deref;
+use std::rc::Rc;
+
+use gpui::{
+    actions, div, prelude::FluentBuilder, px, Action, AppContext, DismissEvent, EventEmitter,
+    FocusHandle, InteractiveElement, IntoElement, KeyBinding, ParentElement, Pixels, Render,
+    SharedString, View, ViewContext, VisualContext as _, WindowContext,
+};
+use gpui::{
+    anchored, canvas, rems, AnchorCorner, AnyElement, Bounds, Edges, FocusableView, Keystroke,
+    ScrollHandle, StatefulInteractiveElement, Styled, WeakView,
+};
+
+use crate::scroll::{Scrollbar, ScrollbarState};
+use crate::StyledExt;
+use crate::{
+    button::Button, h_flex, list::ListItem, popover::Popover, theme::ActiveTheme, v_flex, Icon,
+    IconName, Selectable, Sizable as _,
+};
+
+actions!(menu, [Confirm, Dismiss, SelectNext, SelectPrev]);
+
+pub fn init(cx: &mut AppContext) {
+    let context = Some("PopupMenu");
+    cx.bind_keys([
+        KeyBinding::new("enter", Confirm, context),
+        KeyBinding::new("escape", Dismiss, context),
+        KeyBinding::new("up", SelectPrev, context),
+        KeyBinding::new("down", SelectNext, context),
+    ]);
+}
+
+pub trait PopupMenuExt: Styled + Selectable + IntoElement + 'static {
+    /// Create a popup menu with the given items, anchored to the TopLeft corner
+    fn popup_menu(
+        self,
+        f: impl Fn(PopupMenu, &mut ViewContext<PopupMenu>) -> PopupMenu + 'static,
+    ) -> Popover<PopupMenu> {
+        self.popup_menu_with_anchor(AnchorCorner::TopLeft, f)
+    }
+
+    /// Create a popup menu with the given items, anchored to the given corner
+    fn popup_menu_with_anchor(
+        mut self,
+        anchor: impl Into<AnchorCorner>,
+        f: impl Fn(PopupMenu, &mut ViewContext<PopupMenu>) -> PopupMenu + 'static,
+    ) -> Popover<PopupMenu> {
+        let style = self.style().clone();
+        let element_id = self.element_id();
+
+        Popover::new(SharedString::from(format!("popup-menu:{:?}", element_id)))
+            .no_style()
+            .trigger(self)
+            .trigger_style(style)
+            .anchor(anchor.into())
+            .content(move |cx| PopupMenu::build(cx, |menu, cx| f(menu, cx)))
+    }
+}
+impl PopupMenuExt for Button {}
+
+enum PopupMenuItem {
+    Separator,
+    Item {
+        icon: Option<Icon>,
+        label: SharedString,
+        action: Option<Box<dyn Action>>,
+        handler: Rc<dyn Fn(&mut WindowContext)>,
+    },
+    ElementItem {
+        render: Box<dyn Fn(&mut WindowContext) -> AnyElement + 'static>,
+        handler: Rc<dyn Fn(&mut WindowContext)>,
+    },
+    Submenu {
+        icon: Option<Icon>,
+        label: SharedString,
+        menu: View<PopupMenu>,
+    },
+}
+
+impl PopupMenuItem {
+    fn is_clickable(&self) -> bool {
+        !matches!(self, PopupMenuItem::Separator)
+    }
+
+    fn is_separator(&self) -> bool {
+        matches!(self, PopupMenuItem::Separator)
+    }
+
+    fn has_icon(&self) -> bool {
+        matches!(self, PopupMenuItem::Item { icon: Some(_), .. })
+    }
+}
+
+pub struct PopupMenu {
+    /// The parent menu of this menu, if this is a submenu
+    parent_menu: Option<WeakView<Self>>,
+    focus_handle: FocusHandle,
+    menu_items: Vec<PopupMenuItem>,
+    has_icon: bool,
+    selected_index: Option<usize>,
+    min_width: Pixels,
+    max_width: Pixels,
+    hovered_menu_ix: Option<usize>,
+    bounds: Bounds<Pixels>,
+
+    scrollable: bool,
+    scroll_handle: ScrollHandle,
+    scroll_state: Rc<Cell<ScrollbarState>>,
+
+    action_focus_handle: Option<FocusHandle>,
+    _subscriptions: [gpui::Subscription; 1],
+}
+
+impl PopupMenu {
+    pub fn build(
+        cx: &mut WindowContext,
+        f: impl FnOnce(Self, &mut ViewContext<PopupMenu>) -> Self,
+    ) -> View<Self> {
+        cx.new_view(|cx| {
+            let focus_handle = cx.focus_handle();
+            let _on_blur_subscription = cx.on_blur(&focus_handle, |this: &mut PopupMenu, cx| {
+                this.dismiss(&Dismiss, cx)
+            });
+
+            let menu = Self {
+                focus_handle,
+                action_focus_handle: None,
+                parent_menu: None,
+                menu_items: Vec::new(),
+                selected_index: None,
+                min_width: px(120.),
+                max_width: px(500.),
+                has_icon: false,
+                hovered_menu_ix: None,
+                bounds: Bounds::default(),
+                scrollable: false,
+                scroll_handle: ScrollHandle::default(),
+                scroll_state: Rc::new(Cell::new(ScrollbarState::default())),
+                _subscriptions: [_on_blur_subscription],
+            };
+            cx.refresh();
+            f(menu, cx)
+        })
+    }
+
+    /// Bind the focus handle of the menu, when clicked, it will focus back to this handle and then dispatch the action
+    pub fn track_focus(mut self, focus_handle: &FocusHandle) -> Self {
+        self.action_focus_handle = Some(focus_handle.clone());
+        self
+    }
+
+    /// Set min width of the popup menu, default is 120px
+    pub fn min_w(mut self, width: impl Into<Pixels>) -> Self {
+        self.min_width = width.into();
+        self
+    }
+
+    /// Set max width of the popup menu, default is 500px
+    pub fn max_w(mut self, width: impl Into<Pixels>) -> Self {
+        self.max_width = width.into();
+        self
+    }
+
+    /// Set the menu to be scrollable to show vertical scrollbar.
+    ///
+    /// NOTE: If this is true, the sub-menus will cannot be support.
+    pub fn scrollable(mut self) -> Self {
+        self.scrollable = true;
+        self
+    }
+
+    /// Add Menu Item
+    pub fn menu(mut self, label: impl Into<SharedString>, action: Box<dyn Action>) -> Self {
+        self.add_menu_item(label, None, action);
+        self
+    }
+
+    /// Add Menu to open link
+    pub fn link(mut self, label: impl Into<SharedString>, href: impl Into<String>) -> Self {
+        let href = href.into();
+        self.menu_items.push(PopupMenuItem::Item {
+            icon: None,
+            label: label.into(),
+            action: None,
+            handler: Rc::new(move |cx| cx.open_url(&href)),
+        });
+        self
+    }
+
+    /// Add Menu to open link
+    pub fn link_with_icon(
+        mut self,
+        label: impl Into<SharedString>,
+        icon: impl Into<Icon>,
+        href: impl Into<String>,
+    ) -> Self {
+        let href = href.into();
+        self.menu_items.push(PopupMenuItem::Item {
+            icon: Some(icon.into()),
+            label: label.into(),
+            action: None,
+            handler: Rc::new(move |cx| cx.open_url(&href)),
+        });
+        self
+    }
+
+    /// Add Menu Item with Icon
+    pub fn menu_with_icon(
+        mut self,
+        label: impl Into<SharedString>,
+        icon: impl Into<Icon>,
+        action: Box<dyn Action>,
+    ) -> Self {
+        self.add_menu_item(label, Some(icon.into()), action);
+        self
+    }
+
+    /// Add Menu Item with check icon
+    pub fn menu_with_check(
+        mut self,
+        label: impl Into<SharedString>,
+        checked: bool,
+        action: Box<dyn Action>,
+    ) -> Self {
+        if checked {
+            self.add_menu_item(label, Some(IconName::Check.into()), action);
+        } else {
+            self.add_menu_item(label, None, action);
+        }
+
+        self
+    }
+
+    /// Add Menu Item with custom element render.
+    pub fn menu_with_element<F, E>(mut self, builder: F, action: Box<dyn Action>) -> Self
+    where
+        F: Fn(&mut WindowContext) -> E + 'static,
+        E: IntoElement,
+    {
+        self.menu_items.push(PopupMenuItem::ElementItem {
+            render: Box::new(move |cx| builder(cx).into_any_element()),
+            handler: self.wrap_handler(action),
+        });
+        self
+    }
+
+    fn wrap_handler(&self, action: Box<dyn Action>) -> Rc<dyn Fn(&mut WindowContext)> {
+        let action_focus_handle = self.action_focus_handle.clone();
+
+        Rc::new(move |cx| {
+            cx.activate_window();
+
+            // Focus back to the user expected focus handle
+            // Then the actions listened on that focus handle can be received
+            //
+            // For example:
+            //
+            // TabPanel
+            //   |- PopupMenu
+            //   |- PanelContent (actions are listened here)
+            //
+            // The `PopupMenu` and `PanelContent` are at the same level in the TabPanel
+            // If the actions are listened on the `PanelContent`,
+            // it can't receive the actions from the `PopupMenu`, unless we focus on `PanelContent`.
+            if let Some(handle) = action_focus_handle.as_ref() {
+                cx.focus(&handle);
+            }
+
+            cx.dispatch_action(action.boxed_clone());
+        })
+    }
+
+    fn add_menu_item(
+        &mut self,
+        label: impl Into<SharedString>,
+        icon: Option<Icon>,
+        action: Box<dyn Action>,
+    ) -> &mut Self {
+        if icon.is_some() {
+            self.has_icon = true;
+        }
+
+        self.menu_items.push(PopupMenuItem::Item {
+            icon,
+            label: label.into(),
+            action: Some(action.boxed_clone()),
+            handler: self.wrap_handler(action),
+        });
+        self
+    }
+
+    /// Add a separator Menu Item
+    pub fn separator(mut self) -> Self {
+        if self.menu_items.is_empty() {
+            return self;
+        }
+
+        if let Some(PopupMenuItem::Separator) = self.menu_items.last() {
+            return self;
+        }
+
+        self.menu_items.push(PopupMenuItem::Separator);
+        self
+    }
+
+    pub fn submenu(
+        self,
+        label: impl Into<SharedString>,
+        cx: &mut ViewContext<Self>,
+        f: impl Fn(PopupMenu, &mut ViewContext<PopupMenu>) -> PopupMenu + 'static,
+    ) -> Self {
+        self.submenu_with_icon(None, label, cx, f)
+    }
+
+    /// Add a Submenu item with icon
+    pub fn submenu_with_icon(
+        mut self,
+        icon: Option<Icon>,
+        label: impl Into<SharedString>,
+        cx: &mut ViewContext<Self>,
+        f: impl Fn(PopupMenu, &mut ViewContext<PopupMenu>) -> PopupMenu + 'static,
+    ) -> Self {
+        let submenu = PopupMenu::build(cx, f);
+        let parent_menu = cx.view().downgrade();
+        submenu.update(cx, |view, _| {
+            view.parent_menu = Some(parent_menu);
+        });
+
+        self.menu_items.push(PopupMenuItem::Submenu {
+            icon,
+            label: label.into(),
+            menu: submenu,
+        });
+        self
+    }
+
+    pub(crate) fn active_submenu(&self) -> Option<View<PopupMenu>> {
+        if let Some(ix) = self.hovered_menu_ix {
+            if let Some(item) = self.menu_items.get(ix) {
+                return match item {
+                    PopupMenuItem::Submenu { menu, .. } => Some(menu.clone()),
+                    _ => None,
+                };
+            }
+        }
+
+        None
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.menu_items.is_empty()
+    }
+
+    fn clickable_menu_items(&self) -> impl Iterator<Item = (usize, &PopupMenuItem)> {
+        self.menu_items
+            .iter()
+            .enumerate()
+            .filter(|(_, item)| item.is_clickable())
+    }
+
+    fn on_click(&mut self, ix: usize, cx: &mut ViewContext<Self>) {
+        cx.stop_propagation();
+        cx.prevent_default();
+        self.selected_index = Some(ix);
+        self.confirm(&Confirm, cx);
+    }
+
+    fn confirm(&mut self, _: &Confirm, cx: &mut ViewContext<Self>) {
+        match self.selected_index {
+            Some(index) => {
+                let item = self.menu_items.get(index);
+                match item {
+                    Some(PopupMenuItem::Item { handler, .. }) => {
+                        handler(cx);
+                        self.dismiss(&Dismiss, cx)
+                    }
+                    Some(PopupMenuItem::ElementItem { handler, .. }) => {
+                        handler(cx);
+                        self.dismiss(&Dismiss, cx)
+                    }
+                    _ => {}
+                }
+            }
+            _ => {}
+        }
+    }
+
+    fn select_next(&mut self, _: &SelectNext, cx: &mut ViewContext<Self>) {
+        let count = self.clickable_menu_items().count();
+        if count > 0 {
+            let ix = self
+                .selected_index
+                .map(|index| if index == count - 1 { 0 } else { index + 1 })
+                .unwrap_or(0);
+
+            self.selected_index = Some(ix);
+            cx.notify();
+        }
+    }
+
+    fn select_prev(&mut self, _: &SelectPrev, cx: &mut ViewContext<Self>) {
+        let count = self.clickable_menu_items().count();
+        if count > 0 {
+            let ix = self
+                .selected_index
+                .map(|index| if index == count - 1 { 0 } else { index - 1 })
+                .unwrap_or(count - 1);
+            self.selected_index = Some(ix);
+            cx.notify();
+        }
+    }
+
+    fn dismiss(&mut self, _: &Dismiss, cx: &mut ViewContext<Self>) {
+        if self.active_submenu().is_some() {
+            return;
+        }
+
+        cx.emit(DismissEvent);
+        // Dismiss parent menu, when this menu is dismissed
+        if let Some(parent_menu) = self.parent_menu.clone().and_then(|menu| menu.upgrade()) {
+            parent_menu.update(cx, |view, cx| {
+                view.hovered_menu_ix = None;
+                view.dismiss(&Dismiss, cx);
+            })
+        }
+    }
+
+    fn render_keybinding(
+        action: Option<Box<dyn Action>>,
+        cx: &ViewContext<Self>,
+    ) -> Option<impl IntoElement> {
+        if let Some(action) = action {
+            if let Some(keybinding) = cx.bindings_for_action(action.deref()).first() {
+                let el = div().text_color(cx.theme().muted_foreground).children(
+                    keybinding
+                        .keystrokes()
+                        .into_iter()
+                        .map(|key| key_shortcut(key.clone())),
+                );
+
+                return Some(el);
+            }
+        }
+
+        return None;
+    }
+
+    fn render_icon(
+        has_icon: bool,
+        icon: Option<Icon>,
+        _: &ViewContext<Self>,
+    ) -> Option<impl IntoElement> {
+        let icon_placeholder = if has_icon { Some(Icon::empty()) } else { None };
+
+        if !has_icon {
+            return None;
+        }
+
+        let icon = h_flex()
+            .w_3p5()
+            .h_3p5()
+            .items_center()
+            .justify_center()
+            .text_sm()
+            .map(|this| {
+                if let Some(icon) = icon {
+                    this.child(icon.clone().small())
+                } else {
+                    this.children(icon_placeholder.clone())
+                }
+            });
+
+        Some(icon)
+    }
+}
+
+impl FluentBuilder for PopupMenu {}
+impl EventEmitter<DismissEvent> for PopupMenu {}
+impl FocusableView for PopupMenu {
+    fn focus_handle(&self, _: &AppContext) -> FocusHandle {
+        self.focus_handle.clone()
+    }
+}
+
+impl Render for PopupMenu {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let view = cx.view().clone();
+        let has_icon = self.menu_items.iter().any(|item| item.has_icon());
+        let items_count = self.menu_items.len();
+        let max_width = self.max_width;
+        let bounds = self.bounds;
+
+        let window_haft_height = cx.window_bounds().get_bounds().size.height * 0.5;
+        let max_height = window_haft_height.min(px(450.));
+
+        const ITEM_HEIGHT: Pixels = px(26.);
+
+        v_flex()
+            .id("popup-menu")
+            .key_context("PopupMenu")
+            .track_focus(&self.focus_handle)
+            .on_action(cx.listener(Self::select_next))
+            .on_action(cx.listener(Self::select_prev))
+            .on_action(cx.listener(Self::confirm))
+            .on_action(cx.listener(Self::dismiss))
+            .on_mouse_down_out(cx.listener(|this, _, cx| this.dismiss(&Dismiss, cx)))
+            .popover_style(cx)
+            .text_color(cx.theme().popover_foreground)
+            .relative()
+            .p_1()
+            .child(
+                div()
+                    .id("popup-menu-items")
+                    .when(self.scrollable, |this| {
+                        this.max_h(max_height)
+                            .overflow_y_scroll()
+                            .track_scroll(&self.scroll_handle)
+                    })
+                    .child(
+                        v_flex()
+                            .gap_y_0p5()
+                            .min_w(self.min_width)
+                            .max_w(self.max_width)
+                            .min_w(rems(8.))
+                            .child({
+                                canvas(
+                                    move |bounds, cx| view.update(cx, |r, _| r.bounds = bounds),
+                                    |_, _, _| {},
+                                )
+                                .absolute()
+                                .size_full()
+                            })
+                            .children(
+                                self.menu_items
+                                    .iter_mut()
+                                    .enumerate()
+                                    // Skip last separator
+                                    .filter(|(ix, item)| {
+                                        !(*ix == items_count - 1 && item.is_separator())
+                                    })
+                                    .map(|(ix, item)| {
+                                        let this = ListItem::new(("menu-item", ix))
+                                            .relative()
+                                            .text_sm()
+                                            .py_0()
+                                            .px_2()
+                                            .rounded_md()
+                                            .items_center()
+                                            .on_mouse_enter(cx.listener(move |this, _, cx| {
+                                                this.hovered_menu_ix = Some(ix);
+                                                cx.notify();
+                                            }));
+
+                                        match item {
+                                            PopupMenuItem::Separator => {
+                                                this.h_auto().p_0().disabled(true).child(
+                                                    div()
+                                                        .rounded_none()
+                                                        .h(px(1.))
+                                                        .mx_neg_1()
+                                                        .my_0p5()
+                                                        .bg(cx.theme().muted),
+                                                )
+                                            }
+                                            PopupMenuItem::ElementItem { render, .. } => this
+                                                .on_click(cx.listener(move |this, _, cx| {
+                                                    this.on_click(ix, cx)
+                                                }))
+                                                .child(
+                                                    h_flex()
+                                                        .min_h(ITEM_HEIGHT)
+                                                        .items_center()
+                                                        .gap_x_1p5()
+                                                        .children(Self::render_icon(
+                                                            has_icon, None, cx,
+                                                        ))
+                                                        .child((render)(cx)),
+                                                ),
+                                            PopupMenuItem::Item {
+                                                icon,
+                                                label,
+                                                action,
+                                                ..
+                                            } => {
+                                                let action = action
+                                                    .as_ref()
+                                                    .map(|action| action.boxed_clone());
+                                                let key = Self::render_keybinding(action, cx);
+
+                                                this.on_click(cx.listener(move |this, _, cx| {
+                                                    this.on_click(ix, cx)
+                                                }))
+                                                .child(
+                                                    h_flex()
+                                                        .h(ITEM_HEIGHT)
+                                                        .items_center()
+                                                        .gap_x_1p5()
+                                                        .children(Self::render_icon(
+                                                            has_icon,
+                                                            icon.clone(),
+                                                            cx,
+                                                        ))
+                                                        .child(
+                                                            h_flex()
+                                                                .flex_1()
+                                                                .gap_2()
+                                                                .items_center()
+                                                                .justify_between()
+                                                                .child(label.clone())
+                                                                .children(key),
+                                                        ),
+                                                )
+                                            }
+                                            PopupMenuItem::Submenu { icon, label, menu } => this
+                                                .when(self.hovered_menu_ix == Some(ix), |this| {
+                                                    this.selected(true)
+                                                })
+                                                .child(
+                                                    h_flex()
+                                                        .items_start()
+                                                        .child(
+                                                            h_flex()
+                                                                .size_full()
+                                                                .items_center()
+                                                                .gap_x_1p5()
+                                                                .children(Self::render_icon(
+                                                                    has_icon,
+                                                                    icon.clone(),
+                                                                    cx,
+                                                                ))
+                                                                .child(
+                                                                    h_flex()
+                                                                        .flex_1()
+                                                                        .gap_2()
+                                                                        .items_center()
+                                                                        .justify_between()
+                                                                        .child(label.clone())
+                                                                        .child(
+                                                                            IconName::ChevronRight,
+                                                                        ),
+                                                                ),
+                                                        )
+                                                        .when_some(
+                                                            self.hovered_menu_ix,
+                                                            |this, hovered_ix| {
+                                                                let (anchor, left) =
+                                                                    if cx.bounds().size.width
+                                                                        - bounds.origin.x
+                                                                        < max_width
+                                                                    {
+                                                                        (
+                                                                            AnchorCorner::TopRight,
+                                                                            -px(15.),
+                                                                        )
+                                                                    } else {
+                                                                        (
+                                                                            AnchorCorner::TopLeft,
+                                                                            bounds.size.width
+                                                                                - px(10.),
+                                                                        )
+                                                                    };
+
+                                                                let top = if bounds.origin.y
+                                                                    + bounds.size.height
+                                                                    > cx.bounds().size.height
+                                                                {
+                                                                    px(32.)
+                                                                } else {
+                                                                    -px(10.)
+                                                                };
+
+                                                                if hovered_ix == ix {
+                                                                    this.child(
+                                                                anchored()
+                                                                    .anchor(anchor)
+                                                                    .child(
+                                                                        div()
+                                                                            .occlude()
+                                                                            .top(top)
+                                                                            .left(left)
+                                                                            .child(menu.clone()),
+                                                                    )
+                                                                    .snap_to_window_with_margin(
+                                                                        Edges::all(px(8.)),
+                                                                    ),
+                                                            )
+                                                                } else {
+                                                                    this
+                                                                }
+                                                            },
+                                                        ),
+                                                ),
+                                        }
+                                    }),
+                            ),
+                    ),
+            )
+            .when(self.scrollable, |this| {
+                // TODO: When the menu is limited by `overflow_y_scroll`, the sub-menu will cannot be displayed.
+                this.child(
+                    div()
+                        .absolute()
+                        .top_0()
+                        .left_0()
+                        .right_0p5()
+                        .bottom_0()
+                        .child(Scrollbar::vertical(
+                            cx.entity_id(),
+                            self.scroll_state.clone(),
+                            self.scroll_handle.clone(),
+                            self.bounds.size,
+                        )),
+                )
+            })
+    }
+}
+
+/// Return the Platform specific keybinding string by KeyStroke
+pub fn key_shortcut(key: Keystroke) -> String {
+    if cfg!(target_os = "macos") {
+        return format!("{}", key);
+    }
+
+    let mut parts = vec![];
+    if key.modifiers.control {
+        parts.push("Ctrl");
+    }
+    if key.modifiers.alt {
+        parts.push("Alt");
+    }
+    if key.modifiers.platform {
+        parts.push("Win");
+    }
+    if key.modifiers.shift {
+        parts.push("Shift");
+    }
+
+    // Capitalize the first letter
+    let key = if let Some(first_c) = key.key.chars().next() {
+        format!("{}{}", first_c.to_uppercase(), &key.key[1..])
+    } else {
+        key.key.to_string()
+    };
+
+    parts.push(&key);
+    parts.join("+")
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_key_shortcut() {
+        use super::key_shortcut;
+        use gpui::Keystroke;
+
+        if cfg!(target_os = "windows") {
+            assert_eq!(key_shortcut(Keystroke::parse("a").unwrap()), "A");
+            assert_eq!(key_shortcut(Keystroke::parse("ctrl-a").unwrap()), "Ctrl+A");
+            assert_eq!(
+                key_shortcut(Keystroke::parse("ctrl-alt-a").unwrap()),
+                "Ctrl+Alt+A"
+            );
+            assert_eq!(
+                key_shortcut(Keystroke::parse("ctrl-alt-shift-a").unwrap()),
+                "Ctrl+Alt+Shift+A"
+            );
+            assert_eq!(
+                key_shortcut(Keystroke::parse("ctrl-alt-shift-win-a").unwrap()),
+                "Ctrl+Alt+Win+Shift+A"
+            );
+            assert_eq!(
+                key_shortcut(Keystroke::parse("ctrl-shift-backspace").unwrap()),
+                "Ctrl+Shift+Backspace"
+            );
+        }
+    }
+}

crates/ui/src/prelude.rs

@@ -0,0 +1,9 @@
+//! The prelude of this crate. When building UI in Zed you almost always want to import this.
+
+pub use gpui::prelude::*;
+#[allow(unused_imports)]
+pub use gpui::{
+    div, px, relative, rems, AbsoluteLength, DefiniteLength, Div, Element, ElementId,
+    InteractiveElement, ParentElement, Pixels, Rems, RenderOnce, SharedString, Styled, ViewContext,
+    WindowContext,
+};

crates/ui/src/progress.rs

@@ -0,0 +1,56 @@
+use crate::theme::ActiveTheme;
+use gpui::{
+    div, prelude::FluentBuilder, px, relative, IntoElement, ParentElement, RenderOnce, Styled,
+    WindowContext,
+};
+
+/// A Progress bar element.
+#[derive(IntoElement)]
+pub struct Progress {
+    value: f32,
+    height: f32,
+}
+
+impl Progress {
+    pub fn new() -> Self {
+        Progress {
+            value: Default::default(),
+            height: 8.,
+        }
+    }
+
+    pub fn value(mut self, value: f32) -> Self {
+        self.value = value;
+        self
+    }
+}
+
+impl RenderOnce for Progress {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let rounded = px(self.height / 2.);
+        let relative_w = relative(match self.value {
+            v if v < 0. => 0.,
+            v if v > 100. => 1.,
+            v => v / 100.,
+        });
+
+        div()
+            .relative()
+            .h(px(self.height))
+            .rounded(rounded)
+            .bg(cx.theme().progress_bar.opacity(0.2))
+            .child(
+                div()
+                    .absolute()
+                    .top_0()
+                    .left_0()
+                    .h_full()
+                    .w(relative_w)
+                    .bg(cx.theme().progress_bar)
+                    .map(|this| match self.value {
+                        v if v >= 100. => this.rounded(rounded),
+                        _ => this.rounded_l(rounded),
+                    }),
+            )
+    }
+}

crates/ui/src/radio.rs

@@ -0,0 +1,109 @@
+use crate::{h_flex, theme::ActiveTheme, IconName};
+use gpui::{
+    div, prelude::FluentBuilder, relative, svg, ElementId, InteractiveElement, IntoElement,
+    ParentElement, RenderOnce, SharedString, StatefulInteractiveElement, Styled, WindowContext,
+};
+
+/// A Radio element.
+///
+/// This is not included the Radio group implementation, you can manage the group by yourself.
+#[derive(IntoElement)]
+pub struct Radio {
+    id: ElementId,
+    label: Option<SharedString>,
+    checked: bool,
+    disabled: bool,
+    on_click: Option<Box<dyn Fn(&bool, &mut WindowContext) + 'static>>,
+}
+
+impl Radio {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            id: id.into(),
+            label: None,
+            checked: false,
+            disabled: false,
+            on_click: None,
+        }
+    }
+
+    pub fn label(mut self, label: impl Into<SharedString>) -> Self {
+        self.label = Some(label.into());
+        self
+    }
+
+    pub fn checked(mut self, checked: bool) -> Self {
+        self.checked = checked;
+        self
+    }
+
+    pub fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+
+    pub fn on_click(mut self, handler: impl Fn(&bool, &mut WindowContext) + 'static) -> Self {
+        self.on_click = Some(Box::new(handler));
+        self
+    }
+}
+
+impl RenderOnce for Radio {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let color = if self.disabled {
+            cx.theme().primary.opacity(0.5)
+        } else {
+            cx.theme().primary
+        };
+
+        h_flex()
+            .id(self.id)
+            .gap_x_2()
+            .text_color(cx.theme().foreground)
+            .items_center()
+            .line_height(relative(1.))
+            .child(
+                div()
+                    .relative()
+                    .size_4()
+                    .flex_shrink_0()
+                    .rounded_full()
+                    .border_1()
+                    .border_color(color)
+                    .when(self.checked, |this| this.bg(color))
+                    .child(
+                        svg()
+                            .absolute()
+                            .top_px()
+                            .left_px()
+                            .size_3()
+                            .text_color(color)
+                            .when(self.checked, |this| {
+                                this.text_color(cx.theme().primary_foreground)
+                            })
+                            .map(|this| match self.checked {
+                                true => this.path(IconName::Check.path()),
+                                false => this,
+                            }),
+                    ),
+            )
+            .when_some(self.label, |this, label| {
+                this.child(
+                    div()
+                        .size_full()
+                        .overflow_x_hidden()
+                        .text_ellipsis()
+                        .line_height(relative(1.))
+                        .child(label),
+                )
+            })
+            .when_some(
+                self.on_click.filter(|_| !self.disabled),
+                |this, on_click| {
+                    this.on_click(move |_event, cx| {
+                        on_click(&!self.checked, cx);
+                    })
+                },
+            )
+    }
+}

crates/ui/src/resizable/mod.rs

@@ -0,0 +1,18 @@
+use gpui::{Axis, ViewContext};
+
+mod panel;
+mod resize_handle;
+pub use panel::*;
+pub(crate) use resize_handle::*;
+
+pub fn h_resizable(cx: &mut ViewContext<ResizablePanelGroup>) -> ResizablePanelGroup {
+    ResizablePanelGroup::new(cx).axis(Axis::Horizontal)
+}
+
+pub fn v_resizable(cx: &mut ViewContext<ResizablePanelGroup>) -> ResizablePanelGroup {
+    ResizablePanelGroup::new(cx).axis(Axis::Vertical)
+}
+
+pub fn resizable_panel() -> ResizablePanel {
+    ResizablePanel::new()
+}

crates/ui/src/resizable/panel.rs

@@ -0,0 +1,487 @@
+use std::rc::Rc;
+
+use gpui::{
+    canvas, div, prelude::FluentBuilder, px, relative, Along, AnyElement, AnyView, Axis, Bounds,
+    Element, Entity, EntityId, EventEmitter, IntoElement, IsZero, MouseMoveEvent, MouseUpEvent,
+    ParentElement, Pixels, Render, StatefulInteractiveElement as _, Style, Styled, View,
+    ViewContext, VisualContext as _, WeakView, WindowContext,
+};
+
+use crate::{h_flex, v_flex, AxisExt};
+
+use super::resize_handle;
+
+pub(crate) const PANEL_MIN_SIZE: Pixels = px(100.);
+
+pub enum ResizablePanelEvent {
+    Resized,
+}
+
+#[derive(Clone, Render)]
+pub struct DragPanel(pub (EntityId, usize, Axis));
+
+#[derive(Clone)]
+pub struct ResizablePanelGroup {
+    panels: Vec<View<ResizablePanel>>,
+    sizes: Vec<Pixels>,
+    axis: Axis,
+    size: Option<Pixels>,
+    bounds: Bounds<Pixels>,
+    resizing_panel_ix: Option<usize>,
+}
+
+impl ResizablePanelGroup {
+    pub(super) fn new(_cx: &mut ViewContext<Self>) -> Self {
+        Self {
+            axis: Axis::Horizontal,
+            sizes: Vec::new(),
+            panels: Vec::new(),
+            size: None,
+            bounds: Bounds::default(),
+            resizing_panel_ix: None,
+        }
+    }
+
+    pub fn load(&mut self, sizes: Vec<Pixels>, panels: Vec<View<ResizablePanel>>) {
+        self.sizes = sizes;
+        self.panels = panels;
+    }
+
+    /// Set the axis of the resizable panel group, default is horizontal.
+    pub fn axis(mut self, axis: Axis) -> Self {
+        self.axis = axis;
+        self
+    }
+
+    pub(crate) fn set_axis(&mut self, axis: Axis, cx: &mut ViewContext<Self>) {
+        self.axis = axis;
+        cx.notify();
+    }
+
+    /// Add a resizable panel to the group.
+    pub fn child(mut self, panel: ResizablePanel, cx: &mut ViewContext<Self>) -> Self {
+        self.add_child(panel, cx);
+        self
+    }
+
+    /// Add a ResizablePanelGroup as a child to the group.
+    pub fn group(self, group: ResizablePanelGroup, cx: &mut ViewContext<Self>) -> Self {
+        let group: ResizablePanelGroup = group;
+        let size = group.size;
+        let panel = ResizablePanel::new()
+            .content_view(cx.new_view(|_| group).into())
+            .when_some(size, |this, size| this.size(size));
+        self.child(panel, cx)
+    }
+
+    /// Set size of the resizable panel group
+    ///
+    /// - When the axis is horizontal, the size is the height of the group.
+    /// - When the axis is vertical, the size is the width of the group.
+    pub fn size(mut self, size: Pixels) -> Self {
+        self.size = Some(size);
+        self
+    }
+
+    /// Returns the sizes of the resizable panels.
+    pub(crate) fn sizes(&self) -> Vec<Pixels> {
+        self.sizes.clone()
+    }
+
+    /// Calculates the sum of all panel sizes within the group.
+    pub fn total_size(&self) -> Pixels {
+        self.sizes.iter().fold(px(0.0), |acc, &size| acc + size)
+    }
+
+    pub fn add_child(&mut self, panel: ResizablePanel, cx: &mut ViewContext<Self>) {
+        let mut panel = panel;
+        panel.axis = self.axis;
+        panel.group = Some(cx.view().downgrade());
+        self.sizes.push(panel.initial_size.unwrap_or_default());
+        self.panels.push(cx.new_view(|_| panel));
+    }
+
+    pub fn insert_child(&mut self, panel: ResizablePanel, ix: usize, cx: &mut ViewContext<Self>) {
+        let mut panel = panel;
+        panel.axis = self.axis;
+        panel.group = Some(cx.view().downgrade());
+
+        self.sizes
+            .insert(ix, panel.initial_size.unwrap_or_default());
+        self.panels.insert(ix, cx.new_view(|_| panel));
+        cx.notify()
+    }
+
+    /// Replace a child panel with a new panel at the given index.
+    pub(crate) fn replace_child(
+        &mut self,
+        panel: ResizablePanel,
+        ix: usize,
+        cx: &mut ViewContext<Self>,
+    ) {
+        let mut panel = panel;
+
+        let old_panel = self.panels[ix].clone();
+        let old_panel_initial_size = old_panel.read(cx).initial_size;
+        let old_panel_size_ratio = old_panel.read(cx).size_ratio;
+
+        panel.initial_size = old_panel_initial_size;
+        panel.size_ratio = old_panel_size_ratio;
+        panel.axis = self.axis;
+        panel.group = Some(cx.view().downgrade());
+        self.sizes[ix] = panel.initial_size.unwrap_or_default();
+        self.panels[ix] = cx.new_view(|_| panel);
+        cx.notify()
+    }
+
+    pub fn remove_child(&mut self, ix: usize, cx: &mut ViewContext<Self>) {
+        self.sizes.remove(ix);
+        self.panels.remove(ix);
+        cx.notify()
+    }
+
+    pub(crate) fn remove_all_children(&mut self, cx: &mut ViewContext<Self>) {
+        self.sizes.clear();
+        self.panels.clear();
+        cx.notify()
+    }
+
+    fn render_resize_handle(&self, ix: usize, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let view = cx.view().clone();
+        resize_handle(("resizable-handle", ix), self.axis).on_drag(
+            DragPanel((cx.entity_id(), ix, self.axis)),
+            move |drag_panel, _, cx| {
+                cx.stop_propagation();
+                // Set current resizing panel ix
+                view.update(cx, |view, _| {
+                    view.resizing_panel_ix = Some(ix);
+                });
+                cx.new_view(|_| drag_panel.clone())
+            },
+        )
+    }
+
+    fn done_resizing(&mut self, cx: &mut ViewContext<Self>) {
+        cx.emit(ResizablePanelEvent::Resized);
+        self.resizing_panel_ix = None;
+    }
+
+    fn sync_real_panel_sizes(&mut self, cx: &WindowContext) {
+        for (i, panel) in self.panels.iter().enumerate() {
+            self.sizes[i] = panel.read(cx).bounds.size.along(self.axis)
+        }
+    }
+
+    /// The `ix`` is the index of the panel to resize,
+    /// and the `size` is the new size for the panel.
+    fn resize_panels(&mut self, ix: usize, size: Pixels, cx: &mut ViewContext<Self>) {
+        let mut ix = ix;
+        // Only resize the left panels.
+        if ix >= self.panels.len() - 1 {
+            return;
+        }
+        let size = size.floor();
+        let container_size = self.bounds.size.along(self.axis);
+
+        self.sync_real_panel_sizes(cx);
+
+        let mut changed = size - self.sizes[ix];
+        let is_expand = changed > px(0.);
+
+        let main_ix = ix;
+        let mut new_sizes = self.sizes.clone();
+
+        if is_expand {
+            new_sizes[ix] = size;
+
+            // Now to expand logic is correct.
+            while changed > px(0.) && ix < self.panels.len() - 1 {
+                ix += 1;
+                let available_size = (new_sizes[ix] - PANEL_MIN_SIZE).max(px(0.));
+                let to_reduce = changed.min(available_size);
+                new_sizes[ix] -= to_reduce;
+                changed -= to_reduce;
+            }
+        } else {
+            let new_size = size.max(PANEL_MIN_SIZE);
+            new_sizes[ix] = new_size;
+            changed = size - PANEL_MIN_SIZE;
+            new_sizes[ix + 1] += self.sizes[ix] - new_size;
+
+            while changed < px(0.) && ix > 0 {
+                ix -= 1;
+                let available_size = self.sizes[ix] - PANEL_MIN_SIZE;
+                let to_increase = (changed).min(available_size);
+                new_sizes[ix] += to_increase;
+                changed += to_increase;
+            }
+        }
+
+        // If total size exceeds container size, adjust the main panel
+        let total_size: Pixels = new_sizes.iter().map(|s| s.0).sum::<f32>().into();
+        if total_size > container_size {
+            let overflow = total_size - container_size;
+            new_sizes[main_ix] = (new_sizes[main_ix] - overflow).max(PANEL_MIN_SIZE);
+        }
+
+        let total_size = new_sizes.iter().fold(px(0.0), |acc, &size| acc + size);
+        self.sizes = new_sizes;
+        for (i, panel) in self.panels.iter().enumerate() {
+            let size = self.sizes[i];
+            if size > px(0.) {
+                panel.update(cx, |this, _| {
+                    this.size = Some(size);
+                    this.size_ratio = Some(size / total_size);
+                });
+            }
+        }
+    }
+}
+impl EventEmitter<ResizablePanelEvent> for ResizablePanelGroup {}
+impl Render for ResizablePanelGroup {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let view = cx.view().clone();
+        let container = if self.axis.is_horizontal() {
+            h_flex()
+        } else {
+            v_flex()
+        };
+
+        container
+            .size_full()
+            .children(self.panels.iter().enumerate().map(|(ix, panel)| {
+                if ix > 0 {
+                    let handle = self.render_resize_handle(ix - 1, cx);
+                    panel.update(cx, |view, _| {
+                        view.resize_handle = Some(handle.into_any_element())
+                    });
+                }
+
+                panel.clone()
+            }))
+            .child({
+                canvas(
+                    move |bounds, cx| view.update(cx, |r, _| r.bounds = bounds),
+                    |_, _, _| {},
+                )
+                .absolute()
+                .size_full()
+            })
+            .child(ResizePanelGroupElement {
+                view: cx.view().clone(),
+                axis: self.axis,
+            })
+    }
+}
+
+pub struct ResizablePanel {
+    group: Option<WeakView<ResizablePanelGroup>>,
+    /// Initial size is the size that the panel has when it is created.
+    initial_size: Option<Pixels>,
+    /// size is the size that the panel has when it is resized or adjusted by flex layout.
+    size: Option<Pixels>,
+    /// the size ratio that the panel has relative to its group
+    size_ratio: Option<f32>,
+    axis: Axis,
+    content_builder: Option<Rc<dyn Fn(&mut WindowContext) -> AnyElement>>,
+    content_view: Option<AnyView>,
+    /// The bounds of the resizable panel, when render the bounds will be updated.
+    bounds: Bounds<Pixels>,
+    resize_handle: Option<AnyElement>,
+}
+
+impl ResizablePanel {
+    pub(super) fn new() -> Self {
+        Self {
+            group: None,
+            initial_size: None,
+            size: None,
+            size_ratio: None,
+            axis: Axis::Horizontal,
+            content_builder: None,
+            content_view: None,
+            bounds: Bounds::default(),
+            resize_handle: None,
+        }
+    }
+
+    pub fn content<F>(mut self, content: F) -> Self
+    where
+        F: Fn(&mut WindowContext) -> AnyElement + 'static,
+    {
+        self.content_builder = Some(Rc::new(content));
+        self
+    }
+
+    pub fn content_view(mut self, content: AnyView) -> Self {
+        self.content_view = Some(content);
+        self
+    }
+
+    /// Set the initial size of the panel.
+    pub fn size(mut self, size: Pixels) -> Self {
+        self.initial_size = Some(size);
+        self
+    }
+
+    /// Save the real panel size, and update group sizes
+    fn update_size(&mut self, bounds: Bounds<Pixels>, cx: &mut ViewContext<Self>) {
+        let new_size = bounds.size.along(self.axis);
+        self.bounds = bounds;
+        self.size = Some(new_size);
+
+        let panel_view = cx.view().clone();
+        if let Some(group) = self.group.as_ref() {
+            _ = group.update(cx, |view, _| {
+                if let Some(ix) = view
+                    .panels
+                    .iter()
+                    .position(|v| v.entity_id() == panel_view.entity_id())
+                {
+                    view.sizes[ix] = new_size;
+                }
+            });
+        }
+        cx.notify();
+    }
+}
+
+impl FluentBuilder for ResizablePanel {}
+
+impl Render for ResizablePanel {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let view = cx.view().clone();
+        let total_size = self
+            .group
+            .as_ref()
+            .and_then(|group| group.upgrade())
+            .map(|group| group.read(cx).total_size());
+
+        div()
+            .flex()
+            .flex_grow()
+            .size_full()
+            .relative()
+            .when(self.initial_size.is_none(), |this| this.flex_shrink())
+            .when(self.axis.is_vertical(), |this| this.min_h(PANEL_MIN_SIZE))
+            .when(self.axis.is_horizontal(), |this| this.min_w(PANEL_MIN_SIZE))
+            .when_some(self.initial_size, |this, size| {
+                if size.is_zero() {
+                    this
+                } else {
+                    // The `self.size` is None, that mean the initial size for the panel, so we need set flex_shrink_0
+                    // To let it keep the initial size.
+                    this.when(self.size.is_none() && size > px(0.), |this| {
+                        this.flex_shrink_0()
+                    })
+                    .flex_basis(size)
+                }
+            })
+            .map(|this| match (self.size_ratio, self.size, total_size) {
+                (Some(size_ratio), _, _) => this.flex_basis(relative(size_ratio)),
+                (None, Some(size), Some(total_size)) => {
+                    this.flex_basis(relative(size / total_size))
+                }
+                (None, Some(size), None) => this.flex_basis(size),
+                _ => this,
+            })
+            .child({
+                canvas(
+                    move |bounds, cx| view.update(cx, |r, cx| r.update_size(bounds, cx)),
+                    |_, _, _| {},
+                )
+                .absolute()
+                .size_full()
+            })
+            .when_some(self.content_builder.clone(), |this, c| this.child(c(cx)))
+            .when_some(self.content_view.clone(), |this, c| this.child(c))
+            .when_some(self.resize_handle.take(), |this, c| this.child(c))
+    }
+}
+
+struct ResizePanelGroupElement {
+    axis: Axis,
+    view: View<ResizablePanelGroup>,
+}
+
+impl IntoElement for ResizePanelGroupElement {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+impl Element for ResizePanelGroupElement {
+    type RequestLayoutState = ();
+    type PrepaintState = ();
+
+    fn id(&self) -> Option<gpui::ElementId> {
+        None
+    }
+
+    fn request_layout(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        cx: &mut WindowContext,
+    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
+        (cx.request_layout(Style::default(), None), ())
+    }
+
+    fn prepaint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        _: &mut WindowContext,
+    ) -> Self::PrepaintState {
+        ()
+    }
+
+    fn paint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        _: &mut Self::PrepaintState,
+        cx: &mut WindowContext,
+    ) {
+        cx.on_mouse_event({
+            let view = self.view.clone();
+            let axis = self.axis;
+            let current_ix = view.read(cx).resizing_panel_ix;
+            move |e: &MouseMoveEvent, phase, cx| {
+                if phase.bubble() {
+                    if let Some(ix) = current_ix {
+                        view.update(cx, |view, cx| {
+                            let panel = view
+                                .panels
+                                .get(ix)
+                                .expect("BUG: invalid panel index")
+                                .read(cx);
+
+                            match axis {
+                                Axis::Horizontal => {
+                                    view.resize_panels(ix, e.position.x - panel.bounds.left(), cx)
+                                }
+                                Axis::Vertical => {
+                                    view.resize_panels(ix, e.position.y - panel.bounds.top(), cx);
+                                }
+                            }
+                        })
+                    }
+                }
+            }
+        });
+
+        // When any mouse up, stop dragging
+        cx.on_mouse_event({
+            let view = self.view.clone();
+            move |_: &MouseUpEvent, phase, cx| {
+                if phase.bubble() {
+                    view.update(cx, |view, cx| view.done_resizing(cx));
+                }
+            }
+        })
+    }
+}

crates/ui/src/resizable/resize_handle.rs

@@ -0,0 +1,72 @@
+use gpui::{
+    div, prelude::FluentBuilder as _, px, Axis, Div, ElementId, InteractiveElement, IntoElement,
+    ParentElement as _, Pixels, RenderOnce, Stateful, StatefulInteractiveElement, Styled as _,
+    WindowContext,
+};
+
+use crate::{theme::ActiveTheme as _, AxisExt as _};
+
+pub(crate) const HANDLE_PADDING: Pixels = px(4.);
+pub(crate) const HANDLE_SIZE: Pixels = px(1.);
+
+#[derive(IntoElement)]
+pub(crate) struct ResizeHandle {
+    base: Stateful<Div>,
+    axis: Axis,
+}
+
+impl ResizeHandle {
+    fn new(id: impl Into<ElementId>, axis: Axis) -> Self {
+        Self {
+            base: div().id(id.into()),
+            axis,
+        }
+    }
+}
+
+/// Create a resize handle for a resizable panel.
+pub(crate) fn resize_handle(id: impl Into<ElementId>, axis: Axis) -> ResizeHandle {
+    ResizeHandle::new(id, axis)
+}
+
+impl InteractiveElement for ResizeHandle {
+    fn interactivity(&mut self) -> &mut gpui::Interactivity {
+        self.base.interactivity()
+    }
+}
+impl StatefulInteractiveElement for ResizeHandle {}
+
+impl RenderOnce for ResizeHandle {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let neg_offset = -HANDLE_PADDING;
+
+        self.base
+            .occlude()
+            .absolute()
+            .flex_shrink_0()
+            .when(self.axis.is_horizontal(), |this| {
+                this.cursor_col_resize()
+                    .top_0()
+                    .left(neg_offset)
+                    .h_full()
+                    .w(HANDLE_SIZE)
+                    .px(HANDLE_PADDING)
+            })
+            .when(self.axis.is_vertical(), |this| {
+                this.cursor_row_resize()
+                    .top(neg_offset)
+                    .left_0()
+                    .w_full()
+                    .h(HANDLE_SIZE)
+                    .py(HANDLE_PADDING)
+            })
+            .child(
+                div()
+                    .bg(cx.theme().border)
+                    .when(self.axis.is_horizontal(), |this| {
+                        this.h_full().w(HANDLE_SIZE)
+                    })
+                    .when(self.axis.is_vertical(), |this| this.w_full().h(HANDLE_SIZE)),
+            )
+    }
+}

crates/ui/src/root.rs

@@ -0,0 +1,355 @@
+use crate::{
+    drawer::Drawer,
+    modal::Modal,
+    notification::{Notification, NotificationList},
+    theme::ActiveTheme,
+};
+use gpui::{
+    div, AnyView, FocusHandle, InteractiveElement, IntoElement, ParentElement as _, Render, Styled,
+    View, ViewContext, VisualContext as _, WindowContext,
+};
+use std::{
+    ops::{Deref, DerefMut},
+    rc::Rc,
+};
+
+/// Extension trait for [`WindowContext`] and [`ViewContext`] to add drawer functionality.
+pub trait ContextModal: Sized {
+    /// Opens a Drawer.
+    fn open_drawer<F>(&mut self, build: F)
+    where
+        F: Fn(Drawer, &mut WindowContext) -> Drawer + 'static;
+
+    /// Return true, if there is an active Drawer.
+    fn has_active_drawer(&self) -> bool;
+
+    /// Closes the active Drawer.
+    fn close_drawer(&mut self);
+
+    /// Opens a Modal.
+    fn open_modal<F>(&mut self, build: F)
+    where
+        F: Fn(Modal, &mut WindowContext) -> Modal + 'static;
+
+    /// Return true, if there is an active Modal.
+    fn has_active_modal(&self) -> bool;
+
+    /// Closes the last active Modal.
+    fn close_modal(&mut self);
+
+    /// Closes all active Modals.
+    fn close_all_modals(&mut self);
+
+    /// Pushes a notification to the notification list.
+    fn push_notification(&mut self, note: impl Into<Notification>);
+    fn clear_notifications(&mut self);
+    /// Returns number of notifications.
+    fn notifications(&self) -> Rc<Vec<View<Notification>>>;
+}
+
+impl ContextModal for WindowContext<'_> {
+    fn open_drawer<F>(&mut self, build: F)
+    where
+        F: Fn(Drawer, &mut WindowContext) -> Drawer + 'static,
+    {
+        Root::update(self, move |root, cx| {
+            if root.active_drawer.is_none() {
+                root.previous_focus_handle = cx.focused();
+            }
+
+            let focus_handle = cx.focus_handle();
+            focus_handle.focus(cx);
+
+            root.active_drawer = Some(ActiveDrawer {
+                focus_handle,
+                builder: Rc::new(build),
+            });
+            cx.notify();
+        })
+    }
+
+    fn has_active_drawer(&self) -> bool {
+        Root::read(&self).active_drawer.is_some()
+    }
+
+    fn close_drawer(&mut self) {
+        Root::update(self, |root, cx| {
+            root.active_drawer = None;
+            root.focus_back(cx);
+            cx.notify();
+        })
+    }
+
+    fn open_modal<F>(&mut self, build: F)
+    where
+        F: Fn(Modal, &mut WindowContext) -> Modal + 'static,
+    {
+        Root::update(self, move |root, cx| {
+            // Only save focus handle if there are no active modals.
+            // This is used to restore focus when all modals are closed.
+            if root.active_modals.len() == 0 {
+                root.previous_focus_handle = cx.focused();
+            }
+
+            let focus_handle = cx.focus_handle();
+            focus_handle.focus(cx);
+
+            root.active_modals.push(ActiveModal {
+                focus_handle,
+                builder: Rc::new(build),
+            });
+            cx.notify();
+        })
+    }
+
+    fn has_active_modal(&self) -> bool {
+        Root::read(&self).active_modals.len() > 0
+    }
+
+    fn close_modal(&mut self) {
+        Root::update(self, move |root, cx| {
+            root.active_modals.pop();
+
+            if let Some(top_modal) = root.active_modals.last() {
+                // Focus the next modal.
+                top_modal.focus_handle.focus(cx);
+            } else {
+                // Restore focus if there are no more modals.
+                root.focus_back(cx);
+            }
+            cx.notify();
+        })
+    }
+
+    fn close_all_modals(&mut self) {
+        Root::update(self, |root, cx| {
+            root.active_modals.clear();
+            root.focus_back(cx);
+            cx.notify();
+        })
+    }
+
+    fn push_notification(&mut self, note: impl Into<Notification>) {
+        let note = note.into();
+        Root::update(self, move |root, cx| {
+            root.notification.update(cx, |view, cx| view.push(note, cx));
+            cx.notify();
+        })
+    }
+
+    fn clear_notifications(&mut self) {
+        Root::update(self, move |root, cx| {
+            root.notification.update(cx, |view, cx| view.clear(cx));
+            cx.notify();
+        })
+    }
+
+    fn notifications(&self) -> Rc<Vec<View<Notification>>> {
+        Rc::new(Root::read(&self).notification.read(&self).notifications())
+    }
+}
+impl<V> ContextModal for ViewContext<'_, V> {
+    fn open_drawer<F>(&mut self, build: F)
+    where
+        F: Fn(Drawer, &mut WindowContext) -> Drawer + 'static,
+    {
+        self.deref_mut().open_drawer(build)
+    }
+
+    fn has_active_modal(&self) -> bool {
+        self.deref().has_active_modal()
+    }
+
+    fn close_drawer(&mut self) {
+        self.deref_mut().close_drawer()
+    }
+
+    fn open_modal<F>(&mut self, build: F)
+    where
+        F: Fn(Modal, &mut WindowContext) -> Modal + 'static,
+    {
+        self.deref_mut().open_modal(build)
+    }
+
+    fn has_active_drawer(&self) -> bool {
+        self.deref().has_active_drawer()
+    }
+
+    /// Close the last active modal.
+    fn close_modal(&mut self) {
+        self.deref_mut().close_modal()
+    }
+
+    /// Close all modals.
+    fn close_all_modals(&mut self) {
+        self.deref_mut().close_all_modals()
+    }
+
+    fn push_notification(&mut self, note: impl Into<Notification>) {
+        self.deref_mut().push_notification(note)
+    }
+
+    fn clear_notifications(&mut self) {
+        self.deref_mut().clear_notifications()
+    }
+
+    fn notifications(&self) -> Rc<Vec<View<Notification>>> {
+        self.deref().notifications()
+    }
+}
+
+/// Root is a view for the App window for as the top level view (Must be the first view in the window).
+///
+/// It is used to manage the Drawer, Modal, and Notification.
+pub struct Root {
+    /// Used to store the focus handle of the previous view.
+    /// When the Modal, Drawer closes, we will focus back to the previous view.
+    previous_focus_handle: Option<FocusHandle>,
+    active_drawer: Option<ActiveDrawer>,
+    active_modals: Vec<ActiveModal>,
+    pub notification: View<NotificationList>,
+    view: AnyView,
+}
+
+#[derive(Clone)]
+struct ActiveDrawer {
+    focus_handle: FocusHandle,
+    builder: Rc<dyn Fn(Drawer, &mut WindowContext) -> Drawer + 'static>,
+}
+
+#[derive(Clone)]
+struct ActiveModal {
+    focus_handle: FocusHandle,
+    builder: Rc<dyn Fn(Modal, &mut WindowContext) -> Modal + 'static>,
+}
+
+impl Root {
+    pub fn new(view: AnyView, cx: &mut ViewContext<Self>) -> Self {
+        Self {
+            previous_focus_handle: None,
+            active_drawer: None,
+            active_modals: Vec::new(),
+            notification: cx.new_view(NotificationList::new),
+            view,
+        }
+    }
+
+    pub fn update<F>(cx: &mut WindowContext, f: F)
+    where
+        F: FnOnce(&mut Self, &mut ViewContext<Self>) + 'static,
+    {
+        let root = cx
+            .window_handle()
+            .downcast::<Root>()
+            .and_then(|w| w.root_view(cx).ok())
+            .expect("The window root view should be of type `ui::Root`.");
+
+        root.update(cx, |root, cx| f(root, cx))
+    }
+
+    pub fn read<'a>(cx: &'a WindowContext) -> &'a Self {
+        let root = cx
+            .window_handle()
+            .downcast::<Root>()
+            .and_then(|w| w.root_view(cx).ok())
+            .expect("The window root view should be of type `ui::Root`.");
+
+        root.read(cx)
+    }
+
+    fn focus_back(&mut self, cx: &mut WindowContext) {
+        if let Some(handle) = self.previous_focus_handle.clone() {
+            cx.focus(&handle);
+        }
+    }
+
+    // Render Notification layer.
+    pub fn render_notification_layer(cx: &mut WindowContext) -> Option<impl IntoElement> {
+        let root = cx
+            .window_handle()
+            .downcast::<Root>()
+            .and_then(|w| w.root_view(cx).ok())
+            .expect("The window root view should be of type `ui::Root`.");
+
+        Some(div().child(root.read(cx).notification.clone()))
+    }
+
+    /// Render the Drawer layer.
+    pub fn render_drawer_layer(cx: &mut WindowContext) -> Option<impl IntoElement> {
+        let root = cx
+            .window_handle()
+            .downcast::<Root>()
+            .and_then(|w| w.root_view(cx).ok())
+            .expect("The window root view should be of type `ui::Root`.");
+
+        if let Some(active_drawer) = root.read(cx).active_drawer.clone() {
+            let mut drawer = Drawer::new(cx);
+            drawer = (active_drawer.builder)(drawer, cx);
+            drawer.focus_handle = active_drawer.focus_handle.clone();
+
+            return Some(div().child(drawer));
+        }
+
+        None
+    }
+
+    /// Render the Modal layer.
+    pub fn render_modal_layer(cx: &mut WindowContext) -> Option<impl IntoElement> {
+        let root = cx
+            .window_handle()
+            .downcast::<Root>()
+            .and_then(|w| w.root_view(cx).ok())
+            .expect("The window root view should be of type `ui::Root`.");
+
+        let active_modals = root.read(cx).active_modals.clone();
+        let mut has_overlay = false;
+
+        if active_modals.is_empty() {
+            return None;
+        }
+
+        Some(
+            div().children(active_modals.iter().enumerate().map(|(i, active_modal)| {
+                let mut modal = Modal::new(cx);
+
+                modal = (active_modal.builder)(modal, cx);
+                modal.layer_ix = i;
+                // Give the modal the focus handle, because `modal` is a temporary value, is not possible to
+                // keep the focus handle in the modal.
+                //
+                // So we keep the focus handle in the `active_modal`, this is owned by the `Root`.
+                modal.focus_handle = active_modal.focus_handle.clone();
+
+                // Keep only have one overlay, we only render the first modal with overlay.
+                if has_overlay {
+                    modal.overlay_visible = false;
+                }
+                if modal.has_overlay() {
+                    has_overlay = true;
+                }
+
+                modal
+            })),
+        )
+    }
+
+    /// Return the root view of the Root.
+    pub fn view(&self) -> &AnyView {
+        &self.view
+    }
+}
+
+impl Render for Root {
+    fn render(&mut self, cx: &mut gpui::ViewContext<Self>) -> impl IntoElement {
+        let base_font_size = cx.theme().font_size;
+        cx.set_rem_size(base_font_size);
+
+        div()
+            .id("root")
+            .size_full()
+            .font_family(".SystemUIFont")
+            .bg(cx.theme().background)
+            .text_color(cx.theme().foreground)
+            .child(self.view.clone())
+    }
+}

crates/ui/src/scroll/mod.rs

@@ -0,0 +1,7 @@
+mod scrollable;
+mod scrollable_mask;
+mod scrollbar;
+
+pub use scrollable::*;
+pub use scrollable_mask::*;
+pub use scrollbar::*;

crates/ui/src/scroll/scrollable.rs

@@ -0,0 +1,231 @@
+use std::{cell::Cell, rc::Rc};
+
+use super::{Scrollbar, ScrollbarAxis, ScrollbarState};
+use gpui::{
+    canvas, div, relative, AnyElement, Div, Element, ElementId, EntityId, GlobalElementId,
+    InteractiveElement, IntoElement, ParentElement, Pixels, Position, ScrollHandle, SharedString,
+    Size, Stateful, StatefulInteractiveElement, Style, StyleRefinement, Styled, WindowContext,
+};
+
+/// A scroll view is a container that allows the user to scroll through a large amount of content.
+pub struct Scrollable<E> {
+    id: ElementId,
+    element: Option<E>,
+    view_id: EntityId,
+    axis: ScrollbarAxis,
+    /// This is a fake element to handle Styled, InteractiveElement, not used.
+    _element: Stateful<Div>,
+}
+
+impl<E> Scrollable<E>
+where
+    E: Element,
+{
+    pub(crate) fn new(view_id: EntityId, element: E, axis: ScrollbarAxis) -> Self {
+        let id = ElementId::Name(SharedString::from(format!(
+            "ScrollView:{}-{:?}",
+            view_id,
+            element.id(),
+        )));
+
+        Self {
+            element: Some(element),
+            _element: div().id("fake"),
+            id,
+            view_id,
+            axis,
+        }
+    }
+
+    /// Set only a vertical scrollbar.
+    pub fn vertical(mut self) -> Self {
+        self.set_axis(ScrollbarAxis::Vertical);
+        self
+    }
+
+    /// Set only a horizontal scrollbar.
+    /// In current implementation, this is not supported yet.
+    pub fn horizontal(mut self) -> Self {
+        self.set_axis(ScrollbarAxis::Horizontal);
+        self
+    }
+
+    /// Set the axis of the scroll view.
+    pub fn set_axis(&mut self, axis: ScrollbarAxis) {
+        self.axis = axis;
+    }
+
+    fn with_element_state<R>(
+        &mut self,
+        id: &GlobalElementId,
+        cx: &mut WindowContext,
+        f: impl FnOnce(&mut Self, &mut ScrollViewState, &mut WindowContext) -> R,
+    ) -> R {
+        cx.with_optional_element_state::<ScrollViewState, _>(Some(id), |element_state, cx| {
+            let mut element_state = element_state.unwrap().unwrap_or_default();
+            let result = f(self, &mut element_state, cx);
+            (result, Some(element_state))
+        })
+    }
+}
+
+pub struct ScrollViewState {
+    scroll_size: Rc<Cell<Size<Pixels>>>,
+    state: Rc<Cell<ScrollbarState>>,
+    handle: ScrollHandle,
+}
+
+impl Default for ScrollViewState {
+    fn default() -> Self {
+        Self {
+            handle: ScrollHandle::new(),
+            scroll_size: Rc::new(Cell::new(Size::default())),
+            state: Rc::new(Cell::new(ScrollbarState::default())),
+        }
+    }
+}
+
+impl<E> ParentElement for Scrollable<E>
+where
+    E: Element + ParentElement,
+{
+    fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
+        if let Some(element) = &mut self.element {
+            element.extend(elements);
+        }
+    }
+}
+
+impl<E> Styled for Scrollable<E>
+where
+    E: Element + Styled,
+{
+    fn style(&mut self) -> &mut StyleRefinement {
+        if let Some(element) = &mut self.element {
+            element.style()
+        } else {
+            self._element.style()
+        }
+    }
+}
+
+impl<E> InteractiveElement for Scrollable<E>
+where
+    E: Element + InteractiveElement,
+{
+    fn interactivity(&mut self) -> &mut gpui::Interactivity {
+        if let Some(element) = &mut self.element {
+            element.interactivity()
+        } else {
+            self._element.interactivity()
+        }
+    }
+}
+impl<E> StatefulInteractiveElement for Scrollable<E> where E: Element + StatefulInteractiveElement {}
+
+impl<E> IntoElement for Scrollable<E>
+where
+    E: Element,
+{
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+impl<E> Element for Scrollable<E>
+where
+    E: Element,
+{
+    type RequestLayoutState = AnyElement;
+    type PrepaintState = ScrollViewState;
+
+    fn id(&self) -> Option<gpui::ElementId> {
+        Some(self.id.clone())
+    }
+
+    fn request_layout(
+        &mut self,
+        id: Option<&gpui::GlobalElementId>,
+        cx: &mut gpui::WindowContext,
+    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
+        let mut style = Style::default();
+        style.flex_grow = 1.0;
+        style.position = Position::Relative;
+        style.size.width = relative(1.0).into();
+        style.size.height = relative(1.0).into();
+
+        let axis = self.axis;
+        let view_id = self.view_id;
+
+        let scroll_id = self.id.clone();
+        let content = self.element.take().map(|c| c.into_any_element());
+
+        self.with_element_state(id.unwrap(), cx, |_, element_state, cx| {
+            let handle = element_state.handle.clone();
+            let state = element_state.state.clone();
+            let scroll_size = element_state.scroll_size.clone();
+
+            let mut element = div()
+                .relative()
+                .size_full()
+                .overflow_hidden()
+                .child(
+                    div()
+                        .id(scroll_id)
+                        .track_scroll(&handle)
+                        .overflow_scroll()
+                        .relative()
+                        .size_full()
+                        .child(div().children(content).child({
+                            let scroll_size = element_state.scroll_size.clone();
+                            canvas(move |b, _| scroll_size.set(b.size), |_, _, _| {})
+                                .absolute()
+                                .size_full()
+                        })),
+                )
+                .child(
+                    div()
+                        .absolute()
+                        .top_0()
+                        .left_0()
+                        .right_0()
+                        .bottom_0()
+                        .child(
+                            Scrollbar::both(view_id, state, handle.clone(), scroll_size.get())
+                                .axis(axis),
+                        ),
+                )
+                .into_any_element();
+            let element_id = element.request_layout(cx);
+
+            let layout_id = cx.request_layout(style, vec![element_id]);
+
+            (layout_id, element)
+        })
+    }
+
+    fn prepaint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<Pixels>,
+        element: &mut Self::RequestLayoutState,
+        cx: &mut gpui::WindowContext,
+    ) -> Self::PrepaintState {
+        element.prepaint(cx);
+        // do nothing
+        ScrollViewState::default()
+    }
+
+    fn paint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<Pixels>,
+        element: &mut Self::RequestLayoutState,
+        _: &mut Self::PrepaintState,
+        cx: &mut gpui::WindowContext,
+    ) {
+        element.paint(cx)
+    }
+}

crates/ui/src/scroll/scrollable_mask.rs

@@ -0,0 +1,160 @@
+use gpui::{
+    px, relative, AnyView, Bounds, ContentMask, Corners, Edges, Element, ElementId,
+    GlobalElementId, Hitbox, Hsla, IntoElement, IsZero as _, LayoutId, PaintQuad, Pixels, Point,
+    Position, ScrollHandle, ScrollWheelEvent, Style, WindowContext,
+};
+
+/// The scroll axis direction.
+#[allow(dead_code)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ScrollableAxis {
+    /// Horizontal scroll.
+    Horizontal,
+    /// Vertical scroll.
+    Vertical,
+}
+
+/// Make a scrollable mask element to cover the parent view with the mouse wheel event listening.
+///
+/// When the mouse wheel is scrolled, will move the `scroll_handle` scrolling with the `axis` direction.
+/// You can use this `scroll_handle` to control what you want to scroll.
+/// This is only can handle once axis scrolling.
+pub struct ScrollableMask {
+    view: AnyView,
+    axis: ScrollableAxis,
+    scroll_handle: ScrollHandle,
+    debug: Option<Hsla>,
+}
+
+impl ScrollableMask {
+    /// Create a new scrollable mask element.
+    pub fn new(
+        view: impl Into<AnyView>,
+        axis: ScrollableAxis,
+        scroll_handle: &ScrollHandle,
+    ) -> Self {
+        Self {
+            view: view.into(),
+            scroll_handle: scroll_handle.clone(),
+            axis,
+            debug: None,
+        }
+    }
+
+    /// Enable the debug border, to show the mask bounds.
+    #[allow(dead_code)]
+    pub fn debug(mut self) -> Self {
+        self.debug = Some(gpui::yellow());
+        self
+    }
+}
+
+impl IntoElement for ScrollableMask {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+impl Element for ScrollableMask {
+    type RequestLayoutState = ();
+    type PrepaintState = Hitbox;
+
+    fn id(&self) -> Option<ElementId> {
+        None
+    }
+
+    fn request_layout(
+        &mut self,
+        _: Option<&GlobalElementId>,
+        cx: &mut WindowContext,
+    ) -> (LayoutId, Self::RequestLayoutState) {
+        let mut style = Style::default();
+        // Set the layout style relative to the table view to get same size.
+        style.position = Position::Absolute;
+        style.flex_grow = 1.0;
+        style.flex_shrink = 1.0;
+        style.size.width = relative(1.).into();
+        style.size.height = relative(1.).into();
+
+        (cx.request_layout(style, None), ())
+    }
+
+    fn prepaint(
+        &mut self,
+        _: Option<&GlobalElementId>,
+        bounds: Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        cx: &mut WindowContext,
+    ) -> Self::PrepaintState {
+        // Move y to bounds height to cover the parent view.
+        let cover_bounds = Bounds {
+            origin: Point {
+                x: bounds.origin.x,
+                y: bounds.origin.y - bounds.size.height,
+            },
+            size: bounds.size,
+        };
+
+        cx.insert_hitbox(cover_bounds, false)
+    }
+
+    fn paint(
+        &mut self,
+        _: Option<&GlobalElementId>,
+        _: Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        hitbox: &mut Self::PrepaintState,
+        cx: &mut WindowContext,
+    ) {
+        let line_height = cx.line_height();
+        let bounds = hitbox.bounds;
+
+        cx.with_content_mask(Some(ContentMask { bounds }), |cx| {
+            if let Some(color) = self.debug {
+                cx.paint_quad(PaintQuad {
+                    bounds,
+                    border_widths: Edges::all(px(1.0)),
+                    border_color: color,
+                    background: gpui::transparent_white(),
+                    corner_radii: Corners::all(px(0.)),
+                });
+            }
+
+            cx.on_mouse_event({
+                let hitbox = hitbox.clone();
+                let mouse_position = cx.mouse_position();
+                let scroll_handle = self.scroll_handle.clone();
+                let old_offset = scroll_handle.offset();
+                let view_id = self.view.entity_id();
+                let is_horizontal = self.axis == ScrollableAxis::Horizontal;
+
+                move |event: &ScrollWheelEvent, phase, cx| {
+                    if bounds.contains(&mouse_position) && phase.bubble() && hitbox.is_hovered(cx) {
+                        let delta = event.delta.pixel_delta(line_height);
+
+                        if is_horizontal && !delta.x.is_zero() {
+                            // When is horizontal scroll, move the horizontal scroll handle to make scrolling.
+                            let mut offset = scroll_handle.offset();
+                            offset.x += delta.x;
+                            scroll_handle.set_offset(offset);
+                        }
+
+                        if !is_horizontal && !delta.y.is_zero() {
+                            // When is vertical scroll, move the vertical scroll handle to make scrolling.
+                            let mut offset = scroll_handle.offset();
+                            offset.y += delta.y;
+                            scroll_handle.set_offset(offset);
+                        }
+
+                        if old_offset != scroll_handle.offset() {
+                            cx.notify(Some(view_id));
+                            cx.stop_propagation();
+                        }
+                    }
+                }
+            });
+        });
+    }
+}

crates/ui/src/scroll/scrollbar.rs

@@ -0,0 +1,630 @@
+use std::{cell::Cell, rc::Rc, time::Instant};
+
+use crate::theme::ActiveTheme;
+use gpui::{
+    fill, point, px, relative, Bounds, ContentMask, Edges, Element, EntityId, Hitbox, IntoElement,
+    MouseDownEvent, MouseMoveEvent, MouseUpEvent, PaintQuad, Pixels, Point, Position, ScrollHandle,
+    ScrollWheelEvent, Style, UniformListScrollHandle,
+};
+
+const MIN_THUMB_SIZE: f32 = 80.;
+const THUMB_RADIUS: Pixels = Pixels(3.0);
+const THUMB_INSET: Pixels = Pixels(4.);
+
+pub trait ScrollHandleOffsetable {
+    fn offset(&self) -> Point<Pixels>;
+    fn set_offset(&self, offset: Point<Pixels>);
+    fn is_uniform_list(&self) -> bool {
+        false
+    }
+}
+
+impl ScrollHandleOffsetable for ScrollHandle {
+    fn offset(&self) -> Point<Pixels> {
+        self.offset()
+    }
+
+    fn set_offset(&self, offset: Point<Pixels>) {
+        self.set_offset(offset);
+    }
+}
+
+impl ScrollHandleOffsetable for UniformListScrollHandle {
+    fn offset(&self) -> Point<Pixels> {
+        self.0.borrow().base_handle.offset()
+    }
+
+    fn set_offset(&self, offset: Point<Pixels>) {
+        self.0.borrow_mut().base_handle.set_offset(offset)
+    }
+
+    fn is_uniform_list(&self) -> bool {
+        true
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct ScrollbarState {
+    hovered_axis: Option<ScrollbarAxis>,
+    hovered_on_thumb: Option<ScrollbarAxis>,
+    dragged_axis: Option<ScrollbarAxis>,
+    drag_pos: Point<Pixels>,
+    last_scroll_offset: Point<Pixels>,
+    last_scroll_time: Option<Instant>,
+}
+
+impl Default for ScrollbarState {
+    fn default() -> Self {
+        Self {
+            hovered_axis: None,
+            hovered_on_thumb: None,
+            dragged_axis: None,
+            drag_pos: point(px(0.), px(0.)),
+            last_scroll_offset: point(px(0.), px(0.)),
+            last_scroll_time: None,
+        }
+    }
+}
+
+impl ScrollbarState {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    fn with_drag_pos(&self, axis: ScrollbarAxis, pos: Point<Pixels>) -> Self {
+        let mut state = *self;
+        if axis.is_vertical() {
+            state.drag_pos.y = pos.y;
+        } else {
+            state.drag_pos.x = pos.x;
+        }
+
+        state.dragged_axis = Some(axis);
+        state
+    }
+
+    fn with_unset_drag_pos(&self) -> Self {
+        let mut state = *self;
+        state.dragged_axis = None;
+        state
+    }
+
+    fn with_hovered(&self, axis: Option<ScrollbarAxis>) -> Self {
+        let mut state = *self;
+        state.hovered_axis = axis;
+        state
+    }
+
+    fn with_hovered_on_thumb(&self, axis: Option<ScrollbarAxis>) -> Self {
+        let mut state = *self;
+        state.hovered_on_thumb = axis;
+        state
+    }
+
+    fn with_last_scroll(
+        &self,
+        last_scroll_offset: Point<Pixels>,
+        last_scroll_time: Option<Instant>,
+    ) -> Self {
+        let mut state = *self;
+        state.last_scroll_offset = last_scroll_offset;
+        state.last_scroll_time = last_scroll_time;
+        state
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ScrollbarAxis {
+    Vertical,
+    Horizontal,
+    Both,
+}
+
+impl ScrollbarAxis {
+    #[inline]
+    fn is_vertical(&self) -> bool {
+        matches!(self, Self::Vertical)
+    }
+
+    #[inline]
+    fn is_both(&self) -> bool {
+        matches!(self, Self::Both)
+    }
+
+    #[inline]
+    pub fn has_vertical(&self) -> bool {
+        matches!(self, Self::Vertical | Self::Both)
+    }
+
+    #[inline]
+    pub fn has_horizontal(&self) -> bool {
+        matches!(self, Self::Horizontal | Self::Both)
+    }
+
+    #[inline]
+    fn all(&self) -> Vec<ScrollbarAxis> {
+        match self {
+            Self::Vertical => vec![Self::Vertical],
+            Self::Horizontal => vec![Self::Horizontal],
+            // This should keep vertical first, vertical is the primary axis
+            // if vertical not need display, then horizontal will not keep right margin.
+            Self::Both => vec![Self::Vertical, Self::Horizontal],
+        }
+    }
+}
+
+/// Scrollbar control for scroll-area or a uniform-list.
+pub struct Scrollbar {
+    view_id: EntityId,
+    axis: ScrollbarAxis,
+    /// When is vertical, this is the height of the scrollbar.
+    width: Pixels,
+    scroll_handle: Rc<Box<dyn ScrollHandleOffsetable>>,
+    scroll_size: gpui::Size<Pixels>,
+    state: Rc<Cell<ScrollbarState>>,
+}
+
+impl Scrollbar {
+    fn new(
+        view_id: EntityId,
+        state: Rc<Cell<ScrollbarState>>,
+        axis: ScrollbarAxis,
+        scroll_handle: impl ScrollHandleOffsetable + 'static,
+        scroll_size: gpui::Size<Pixels>,
+    ) -> Self {
+        Self {
+            view_id,
+            state,
+            axis,
+            scroll_size,
+            width: px(12.),
+            scroll_handle: Rc::new(Box::new(scroll_handle)),
+        }
+    }
+
+    /// Create with vertical and horizontal scrollbar.
+    pub fn both(
+        view_id: EntityId,
+        state: Rc<Cell<ScrollbarState>>,
+        scroll_handle: impl ScrollHandleOffsetable + 'static,
+        scroll_size: gpui::Size<Pixels>,
+    ) -> Self {
+        Self::new(
+            view_id,
+            state,
+            ScrollbarAxis::Both,
+            scroll_handle,
+            scroll_size,
+        )
+    }
+
+    /// Create with horizontal scrollbar.
+    pub fn horizontal(
+        view_id: EntityId,
+        state: Rc<Cell<ScrollbarState>>,
+        scroll_handle: impl ScrollHandleOffsetable + 'static,
+        scroll_size: gpui::Size<Pixels>,
+    ) -> Self {
+        Self::new(
+            view_id,
+            state,
+            ScrollbarAxis::Horizontal,
+            scroll_handle,
+            scroll_size,
+        )
+    }
+
+    /// Create with vertical scrollbar.
+    pub fn vertical(
+        view_id: EntityId,
+        state: Rc<Cell<ScrollbarState>>,
+        scroll_handle: impl ScrollHandleOffsetable + 'static,
+        scroll_size: gpui::Size<Pixels>,
+    ) -> Self {
+        Self::new(
+            view_id,
+            state,
+            ScrollbarAxis::Vertical,
+            scroll_handle,
+            scroll_size,
+        )
+    }
+
+    /// Create vertical scrollbar for uniform list.
+    pub fn uniform_scroll(
+        view_id: EntityId,
+        state: Rc<Cell<ScrollbarState>>,
+        scroll_handle: UniformListScrollHandle,
+    ) -> Self {
+        let scroll_size = scroll_handle
+            .0
+            .borrow()
+            .last_item_size
+            .map(|size| size.contents)
+            .unwrap_or_default();
+
+        Self::new(
+            view_id,
+            state,
+            ScrollbarAxis::Vertical,
+            scroll_handle,
+            scroll_size,
+        )
+    }
+
+    /// Set scrollbar axis.
+    pub fn axis(mut self, axis: ScrollbarAxis) -> Self {
+        self.axis = axis;
+        self
+    }
+}
+
+impl IntoElement for Scrollbar {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+impl Element for Scrollbar {
+    type RequestLayoutState = ();
+
+    type PrepaintState = Hitbox;
+
+    fn id(&self) -> Option<gpui::ElementId> {
+        None
+    }
+
+    fn request_layout(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        cx: &mut gpui::WindowContext,
+    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
+        let mut style = Style::default();
+        style.position = Position::Absolute;
+        style.flex_grow = 1.0;
+        style.flex_shrink = 1.0;
+        style.size.width = relative(1.).into();
+        style.size.height = relative(1.).into();
+
+        (cx.request_layout(style, None), ())
+    }
+
+    fn prepaint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        bounds: Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        cx: &mut gpui::WindowContext,
+    ) -> Self::PrepaintState {
+        cx.with_content_mask(Some(ContentMask { bounds }), |cx| {
+            cx.insert_hitbox(bounds, false)
+        })
+    }
+
+    fn paint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        hitbox: &mut Self::PrepaintState,
+        cx: &mut gpui::WindowContext,
+    ) {
+        let hitbox_bounds = hitbox.bounds;
+        let mut has_both = self.axis.is_both();
+
+        for axis in self.axis.all().into_iter() {
+            const NORMAL_OPACITY: f32 = 0.6;
+
+            let is_vertical = axis.is_vertical();
+            let (scroll_area_size, container_size, scroll_position) = if is_vertical {
+                (
+                    self.scroll_size.height,
+                    hitbox_bounds.size.height,
+                    self.scroll_handle.offset().y,
+                )
+            } else {
+                (
+                    self.scroll_size.width,
+                    hitbox_bounds.size.width,
+                    self.scroll_handle.offset().x,
+                )
+            };
+
+            // The horizontal scrollbar is set avoid overlapping with the vertical scrollbar, if the vertical scrollbar is visible.
+            let margin_end = if has_both && !is_vertical {
+                self.width
+            } else {
+                px(0.)
+            };
+
+            // Hide scrollbar, if the scroll area is smaller than the container.
+            if scroll_area_size <= container_size {
+                has_both = false;
+                continue;
+            }
+
+            let thumb_length =
+                (container_size / scroll_area_size * container_size).max(px(MIN_THUMB_SIZE));
+            let thumb_start = -(scroll_position / (scroll_area_size - container_size)
+                * (container_size - margin_end - thumb_length));
+            let thumb_end = (thumb_start + thumb_length).min(container_size - margin_end);
+
+            let bounds = Bounds {
+                origin: if is_vertical {
+                    point(
+                        hitbox_bounds.origin.x + hitbox_bounds.size.width - self.width,
+                        hitbox_bounds.origin.y,
+                    )
+                } else {
+                    point(
+                        hitbox_bounds.origin.x,
+                        hitbox_bounds.origin.y + hitbox_bounds.size.height - self.width,
+                    )
+                },
+                size: gpui::Size {
+                    width: if is_vertical {
+                        self.width
+                    } else {
+                        hitbox_bounds.size.width
+                    },
+                    height: if is_vertical {
+                        hitbox_bounds.size.height
+                    } else {
+                        self.width
+                    },
+                },
+            };
+
+            let state = self.state.clone();
+            let (thumb_bg, bar_bg, bar_border, inset, radius) =
+                if state.get().dragged_axis == Some(axis) {
+                    (
+                        cx.theme().scrollbar_thumb,
+                        cx.theme().scrollbar,
+                        cx.theme().border,
+                        THUMB_INSET - px(1.),
+                        THUMB_RADIUS,
+                    )
+                } else if state.get().hovered_axis == Some(axis) {
+                    if state.get().hovered_on_thumb == Some(axis) {
+                        (
+                            cx.theme().scrollbar_thumb,
+                            cx.theme().scrollbar,
+                            cx.theme().border,
+                            THUMB_INSET - px(1.),
+                            THUMB_RADIUS,
+                        )
+                    } else {
+                        (
+                            cx.theme().scrollbar_thumb.opacity(NORMAL_OPACITY),
+                            gpui::transparent_black(),
+                            gpui::transparent_black(),
+                            THUMB_INSET,
+                            THUMB_RADIUS,
+                        )
+                    }
+                } else {
+                    let mut idle_state = (
+                        gpui::transparent_black(),
+                        gpui::transparent_black(),
+                        gpui::transparent_black(),
+                        THUMB_INSET,
+                        THUMB_RADIUS - px(1.),
+                    );
+                    if let Some(last_time) = state.get().last_scroll_time {
+                        let elapsed = Instant::now().duration_since(last_time).as_secs_f32();
+                        if elapsed < 1.0 {
+                            let y_value = NORMAL_OPACITY - elapsed.powi(10); // y = 1 - x^10
+                            idle_state.0 = cx.theme().scrollbar_thumb.opacity(y_value);
+                            cx.request_animation_frame();
+                        }
+                    }
+                    idle_state
+                };
+
+            let border_width = px(0.);
+            let thumb_bounds = if is_vertical {
+                Bounds::from_corners(
+                    point(
+                        bounds.origin.x + inset + border_width,
+                        bounds.origin.y + thumb_start + inset,
+                    ),
+                    point(
+                        bounds.origin.x + self.width - inset,
+                        bounds.origin.y + thumb_end - inset,
+                    ),
+                )
+            } else {
+                Bounds::from_corners(
+                    point(
+                        bounds.origin.x + thumb_start + inset,
+                        bounds.origin.y + inset + border_width,
+                    ),
+                    point(
+                        bounds.origin.x + thumb_end - inset,
+                        bounds.origin.y + self.width - inset,
+                    ),
+                )
+            };
+
+            cx.paint_layer(hitbox_bounds, |cx| {
+                cx.paint_quad(fill(bounds, bar_bg));
+
+                cx.paint_quad(PaintQuad {
+                    bounds,
+                    corner_radii: (0.).into(),
+                    background: gpui::transparent_black(),
+                    border_widths: if is_vertical {
+                        Edges {
+                            top: px(0.),
+                            right: px(0.),
+                            bottom: px(0.),
+                            left: border_width,
+                        }
+                    } else {
+                        Edges {
+                            top: border_width,
+                            right: px(0.),
+                            bottom: px(0.),
+                            left: px(0.),
+                        }
+                    },
+                    border_color: bar_border,
+                });
+
+                cx.paint_quad(fill(thumb_bounds, thumb_bg).corner_radii(radius));
+            });
+
+            cx.on_mouse_event({
+                let state = self.state.clone();
+                let view_id = self.view_id;
+                let scroll_handle = self.scroll_handle.clone();
+
+                move |event: &ScrollWheelEvent, phase, cx| {
+                    if phase.bubble() && hitbox_bounds.contains(&event.position) {
+                        if scroll_handle.offset() != state.get().last_scroll_offset {
+                            state.set(
+                                state
+                                    .get()
+                                    .with_last_scroll(scroll_handle.offset(), Some(Instant::now())),
+                            );
+                            cx.notify(Some(view_id));
+                        }
+                    }
+                }
+            });
+
+            let safe_range = (-scroll_area_size + container_size)..px(0.);
+
+            cx.on_mouse_event({
+                let state = self.state.clone();
+                let view_id = self.view_id;
+                let scroll_handle = self.scroll_handle.clone();
+
+                move |event: &MouseDownEvent, phase, cx| {
+                    if phase.bubble() && bounds.contains(&event.position) {
+                        cx.stop_propagation();
+
+                        if thumb_bounds.contains(&event.position) {
+                            // click on the thumb bar, set the drag position
+                            let pos = event.position - thumb_bounds.origin;
+
+                            state.set(state.get().with_drag_pos(axis, pos));
+
+                            cx.notify(Some(view_id));
+                        } else {
+                            // click on the scrollbar, jump to the position
+                            // Set the thumb bar center to the click position
+                            let offset = scroll_handle.offset();
+                            let percentage = if is_vertical {
+                                (event.position.y - thumb_length / 2. - bounds.origin.y)
+                                    / (bounds.size.height - thumb_length)
+                            } else {
+                                (event.position.x - thumb_length / 2. - bounds.origin.x)
+                                    / (bounds.size.width - thumb_length)
+                            }
+                            .min(1.);
+
+                            if is_vertical {
+                                scroll_handle.set_offset(point(
+                                    offset.x,
+                                    (-scroll_area_size * percentage)
+                                        .clamp(safe_range.start, safe_range.end),
+                                ));
+                            } else {
+                                scroll_handle.set_offset(point(
+                                    (-scroll_area_size * percentage)
+                                        .clamp(safe_range.start, safe_range.end),
+                                    offset.y,
+                                ));
+                            }
+                        }
+                    }
+                }
+            });
+
+            cx.on_mouse_event({
+                let scroll_handle = self.scroll_handle.clone();
+                let state = self.state.clone();
+                let view_id = self.view_id;
+
+                move |event: &MouseMoveEvent, _, cx| {
+                    // Update hovered state for scrollbar
+                    if bounds.contains(&event.position) {
+                        if state.get().hovered_axis != Some(axis) {
+                            state.set(state.get().with_hovered(Some(axis)));
+                            cx.notify(Some(view_id));
+                        }
+                    } else {
+                        if state.get().hovered_axis == Some(axis) {
+                            if state.get().hovered_axis.is_some() {
+                                state.set(state.get().with_hovered(None));
+                                cx.notify(Some(view_id));
+                            }
+                        }
+                    }
+
+                    // Update hovered state for scrollbar thumb
+                    if thumb_bounds.contains(&event.position) {
+                        if state.get().hovered_on_thumb != Some(axis) {
+                            state.set(state.get().with_hovered_on_thumb(Some(axis)));
+                            cx.notify(Some(view_id));
+                        }
+                    } else {
+                        if state.get().hovered_on_thumb == Some(axis) {
+                            state.set(state.get().with_hovered_on_thumb(None));
+                            cx.notify(Some(view_id));
+                        }
+                    }
+
+                    // Move thumb position on dragging
+                    if state.get().dragged_axis == Some(axis) && event.dragging() {
+                        // drag_pos is the position of the mouse down event
+                        // We need to keep the thumb bar still at the origin down position
+                        let drag_pos = state.get().drag_pos;
+
+                        let percentage = (if is_vertical {
+                            (event.position.y - drag_pos.y - bounds.origin.y)
+                                / (bounds.size.height - thumb_length)
+                        } else {
+                            (event.position.x - drag_pos.x - bounds.origin.x)
+                                / (bounds.size.width - thumb_length - margin_end)
+                        })
+                        .clamp(0., 1.);
+
+                        let offset = if is_vertical {
+                            point(
+                                scroll_handle.offset().x,
+                                (-(scroll_area_size - container_size) * percentage)
+                                    .clamp(safe_range.start, safe_range.end),
+                            )
+                        } else {
+                            point(
+                                (-(scroll_area_size - container_size) * percentage)
+                                    .clamp(safe_range.start, safe_range.end),
+                                scroll_handle.offset().y,
+                            )
+                        };
+
+                        scroll_handle.set_offset(offset);
+                        cx.notify(Some(view_id));
+                    }
+                }
+            });
+
+            cx.on_mouse_event({
+                let view_id = self.view_id;
+                let state = self.state.clone();
+
+                move |_event: &MouseUpEvent, phase, cx| {
+                    if phase.bubble() {
+                        state.set(state.get().with_unset_drag_pos());
+                        cx.notify(Some(view_id));
+                    }
+                }
+            });
+        }
+    }
+}

crates/ui/src/sidebar/footer.rs

@@ -0,0 +1,77 @@
+use gpui::{
+    prelude::FluentBuilder as _, Div, ElementId, InteractiveElement, IntoElement, ParentElement,
+    RenderOnce, SharedString, Styled,
+};
+
+use crate::{h_flex, popup_menu::PopupMenuExt, theme::ActiveTheme as _, Collapsible, Selectable};
+
+#[derive(IntoElement)]
+pub struct SidebarFooter {
+    id: ElementId,
+    base: Div,
+    selected: bool,
+    is_collapsed: bool,
+}
+
+impl SidebarFooter {
+    pub fn new() -> Self {
+        Self {
+            id: SharedString::from("sidebar-footer").into(),
+            base: h_flex().gap_2().w_full(),
+            selected: false,
+            is_collapsed: false,
+        }
+    }
+}
+impl Selectable for SidebarFooter {
+    fn selected(mut self, selected: bool) -> Self {
+        self.selected = selected;
+        self
+    }
+
+    fn element_id(&self) -> &gpui::ElementId {
+        &self.id
+    }
+}
+impl Collapsible for SidebarFooter {
+    fn is_collapsed(&self) -> bool {
+        self.is_collapsed
+    }
+
+    fn collapsed(mut self, collapsed: bool) -> Self {
+        self.is_collapsed = collapsed;
+        self
+    }
+}
+impl ParentElement for SidebarFooter {
+    fn extend(&mut self, elements: impl IntoIterator<Item = gpui::AnyElement>) {
+        self.base.extend(elements);
+    }
+}
+impl Styled for SidebarFooter {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+impl PopupMenuExt for SidebarFooter {}
+impl RenderOnce for SidebarFooter {
+    fn render(self, cx: &mut gpui::WindowContext) -> impl gpui::IntoElement {
+        h_flex()
+            .id(self.id)
+            .gap_2()
+            .p_2()
+            .w_full()
+            .justify_between()
+            .cursor_pointer()
+            .rounded_md()
+            .hover(|this| {
+                this.bg(cx.theme().sidebar_accent)
+                    .text_color(cx.theme().sidebar_accent_foreground)
+            })
+            .when(self.selected, |this| {
+                this.bg(cx.theme().sidebar_accent)
+                    .text_color(cx.theme().sidebar_accent_foreground)
+            })
+            .child(self.base)
+    }
+}

crates/ui/src/sidebar/group.rs

@@ -0,0 +1,71 @@
+use crate::{theme::ActiveTheme, v_flex, Collapsible};
+use gpui::{
+    div, prelude::FluentBuilder as _, Div, IntoElement, ParentElement, RenderOnce, SharedString,
+    Styled as _, WindowContext,
+};
+
+/// A sidebar group
+#[derive(IntoElement)]
+pub struct SidebarGroup<E: Collapsible + IntoElement + 'static> {
+    base: Div,
+    label: SharedString,
+    is_collapsed: bool,
+    children: Vec<E>,
+}
+
+impl<E: Collapsible + IntoElement> SidebarGroup<E> {
+    pub fn new(label: impl Into<SharedString>) -> Self {
+        Self {
+            base: div().gap_2().flex_col(),
+            label: label.into(),
+            is_collapsed: false,
+            children: Vec::new(),
+        }
+    }
+
+    pub fn child(mut self, child: E) -> Self {
+        self.children.push(child);
+        self
+    }
+
+    pub fn children(mut self, children: impl IntoIterator<Item = E>) -> Self {
+        self.children.extend(children);
+        self
+    }
+}
+impl<E: Collapsible + IntoElement> Collapsible for SidebarGroup<E> {
+    fn is_collapsed(&self) -> bool {
+        self.is_collapsed
+    }
+
+    fn collapsed(mut self, collapsed: bool) -> Self {
+        self.is_collapsed = collapsed;
+        self
+    }
+}
+impl<E: Collapsible + IntoElement> RenderOnce for SidebarGroup<E> {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        v_flex()
+            .relative()
+            .p_2()
+            .when(!self.is_collapsed, |this| {
+                this.child(
+                    div()
+                        .flex_shrink_0()
+                        .px_2()
+                        .rounded_md()
+                        .text_xs()
+                        .text_color(cx.theme().sidebar_foreground.opacity(0.7))
+                        .h_8()
+                        .child(self.label),
+                )
+            })
+            .child(
+                self.base.children(
+                    self.children
+                        .into_iter()
+                        .map(|child| child.collapsed(self.is_collapsed)),
+                ),
+            )
+    }
+}

crates/ui/src/sidebar/header.rs

@@ -0,0 +1,77 @@
+use gpui::{
+    prelude::FluentBuilder as _, Div, ElementId, InteractiveElement, IntoElement, ParentElement,
+    RenderOnce, SharedString, Styled,
+};
+
+use crate::{h_flex, popup_menu::PopupMenuExt, theme::ActiveTheme as _, Collapsible, Selectable};
+
+#[derive(IntoElement)]
+pub struct SidebarHeader {
+    id: ElementId,
+    base: Div,
+    selected: bool,
+    is_collapsed: bool,
+}
+
+impl SidebarHeader {
+    pub fn new() -> Self {
+        Self {
+            id: SharedString::from("sidebar-header").into(),
+            base: h_flex().gap_2().w_full(),
+            selected: false,
+            is_collapsed: false,
+        }
+    }
+}
+impl Selectable for SidebarHeader {
+    fn selected(mut self, selected: bool) -> Self {
+        self.selected = selected;
+        self
+    }
+
+    fn element_id(&self) -> &gpui::ElementId {
+        &self.id
+    }
+}
+impl Collapsible for SidebarHeader {
+    fn is_collapsed(&self) -> bool {
+        self.is_collapsed
+    }
+
+    fn collapsed(mut self, collapsed: bool) -> Self {
+        self.is_collapsed = collapsed;
+        self
+    }
+}
+impl ParentElement for SidebarHeader {
+    fn extend(&mut self, elements: impl IntoIterator<Item = gpui::AnyElement>) {
+        self.base.extend(elements);
+    }
+}
+impl Styled for SidebarHeader {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+impl PopupMenuExt for SidebarHeader {}
+impl RenderOnce for SidebarHeader {
+    fn render(self, cx: &mut gpui::WindowContext) -> impl gpui::IntoElement {
+        h_flex()
+            .id(self.id)
+            .gap_2()
+            .p_2()
+            .w_full()
+            .justify_between()
+            .cursor_pointer()
+            .rounded_md()
+            .hover(|this| {
+                this.bg(cx.theme().sidebar_accent)
+                    .text_color(cx.theme().sidebar_accent_foreground)
+            })
+            .when(self.selected, |this| {
+                this.bg(cx.theme().sidebar_accent)
+                    .text_color(cx.theme().sidebar_accent_foreground)
+            })
+            .child(self.base)
+    }
+}

crates/ui/src/sidebar/menu.rs

@@ -0,0 +1,237 @@
+use crate::{h_flex, theme::ActiveTheme as _, v_flex, Collapsible, Icon, IconName, StyledExt};
+use gpui::{
+    div, percentage, prelude::FluentBuilder as _, ClickEvent, InteractiveElement as _, IntoElement,
+    ParentElement as _, RenderOnce, SharedString, StatefulInteractiveElement as _, Styled as _,
+    WindowContext,
+};
+use std::rc::Rc;
+
+#[derive(IntoElement)]
+pub struct SidebarMenu {
+    is_collapsed: bool,
+    items: Vec<SidebarMenuItem>,
+}
+
+impl SidebarMenu {
+    pub fn new() -> Self {
+        Self {
+            items: Vec::new(),
+            is_collapsed: false,
+        }
+    }
+
+    pub fn menu(
+        mut self,
+        label: impl Into<SharedString>,
+        icon: Option<Icon>,
+        active: bool,
+        handler: impl Fn(&ClickEvent, &mut WindowContext) + 'static,
+    ) -> Self {
+        self.items.push(SidebarMenuItem::Item {
+            icon,
+            label: label.into(),
+            handler: Rc::new(handler),
+            active,
+            is_collapsed: self.is_collapsed,
+        });
+        self
+    }
+
+    pub fn submenu(
+        mut self,
+        label: impl Into<SharedString>,
+        icon: Option<Icon>,
+        open: bool,
+        items: impl FnOnce(SidebarMenu) -> Self,
+        handler: impl Fn(&ClickEvent, &mut WindowContext) + 'static,
+    ) -> Self {
+        let menu = SidebarMenu::new();
+        let menu = items(menu);
+        self.items.push(SidebarMenuItem::Submenu {
+            icon,
+            label: label.into(),
+            items: menu.items,
+            is_open: open,
+            is_collapsed: self.is_collapsed,
+            handler: Rc::new(handler),
+        });
+        self
+    }
+}
+impl Collapsible for SidebarMenu {
+    fn is_collapsed(&self) -> bool {
+        self.is_collapsed
+    }
+
+    fn collapsed(mut self, collapsed: bool) -> Self {
+        self.is_collapsed = collapsed;
+        self
+    }
+}
+impl RenderOnce for SidebarMenu {
+    fn render(self, _: &mut WindowContext) -> impl IntoElement {
+        v_flex()
+            .gap_2()
+            .children(self.items.into_iter().map(|mut item| {
+                match &mut item {
+                    SidebarMenuItem::Item { is_collapsed, .. } => *is_collapsed = self.is_collapsed,
+                    SidebarMenuItem::Submenu { is_collapsed, .. } => {
+                        *is_collapsed = self.is_collapsed
+                    }
+                }
+                item
+            }))
+    }
+}
+
+/// A sidebar menu item
+#[derive(IntoElement)]
+enum SidebarMenuItem {
+    Item {
+        icon: Option<Icon>,
+        label: SharedString,
+        handler: Rc<dyn Fn(&ClickEvent, &mut WindowContext)>,
+        active: bool,
+        is_collapsed: bool,
+    },
+    Submenu {
+        icon: Option<Icon>,
+        label: SharedString,
+        handler: Rc<dyn Fn(&ClickEvent, &mut WindowContext)>,
+        items: Vec<SidebarMenuItem>,
+        is_open: bool,
+        is_collapsed: bool,
+    },
+}
+
+impl SidebarMenuItem {
+    fn is_submenu(&self) -> bool {
+        matches!(self, SidebarMenuItem::Submenu { .. })
+    }
+
+    fn icon(&self) -> Option<Icon> {
+        match self {
+            SidebarMenuItem::Item { icon, .. } => icon.clone(),
+            SidebarMenuItem::Submenu { icon, .. } => icon.clone(),
+        }
+    }
+
+    fn label(&self) -> SharedString {
+        match self {
+            SidebarMenuItem::Item { label, .. } => label.clone(),
+            SidebarMenuItem::Submenu { label, .. } => label.clone(),
+        }
+    }
+
+    fn is_active(&self) -> bool {
+        match self {
+            SidebarMenuItem::Item { active, .. } => *active,
+            SidebarMenuItem::Submenu { .. } => false,
+        }
+    }
+
+    fn is_open(&self) -> bool {
+        match self {
+            SidebarMenuItem::Item { .. } => false,
+            SidebarMenuItem::Submenu { is_open, items, .. } => {
+                *is_open || items.iter().any(|item| item.is_active())
+            }
+        }
+    }
+
+    fn is_collapsed(&self) -> bool {
+        match self {
+            SidebarMenuItem::Item { is_collapsed, .. } => *is_collapsed,
+            SidebarMenuItem::Submenu { is_collapsed, .. } => *is_collapsed,
+        }
+    }
+
+    fn render_menu_item(
+        &self,
+        is_submenu: bool,
+        is_active: bool,
+        is_open: bool,
+        cx: &WindowContext,
+    ) -> impl IntoElement {
+        let handler = match &self {
+            SidebarMenuItem::Item { handler, .. } => Some(handler.clone()),
+            SidebarMenuItem::Submenu { handler, .. } => Some(handler.clone()),
+        };
+        let is_collapsed = self.is_collapsed();
+
+        h_flex()
+            .id("sidebar-menu-item")
+            .overflow_hidden()
+            .flex_shrink_0()
+            .p_2()
+            .gap_2()
+            .items_center()
+            .rounded_md()
+            .text_sm()
+            .cursor_pointer()
+            .hover(|this| {
+                this.bg(cx.theme().sidebar_accent)
+                    .text_color(cx.theme().sidebar_accent_foreground)
+            })
+            .when(is_active, |this| {
+                this.font_medium()
+                    .bg(cx.theme().sidebar_accent)
+                    .text_color(cx.theme().sidebar_accent_foreground)
+            })
+            .when_some(self.icon(), |this, icon| this.child(icon.size_4()))
+            .when(is_collapsed, |this| {
+                this.justify_center().size_7().mx_auto()
+            })
+            .when(!is_collapsed, |this| {
+                this.h_7()
+                    .child(div().flex_1().child(self.label()))
+                    .when(is_submenu, |this| {
+                        this.child(
+                            Icon::new(IconName::ChevronRight)
+                                .size_4()
+                                .when(is_open, |this| this.rotate(percentage(90. / 360.))),
+                        )
+                    })
+            })
+            .when_some(handler, |this, handler| {
+                this.on_click(move |ev, cx| handler(ev, cx))
+            })
+    }
+}
+
+impl RenderOnce for SidebarMenuItem {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let is_submenu = self.is_submenu();
+        let is_active = self.is_active();
+        let is_open = self.is_open();
+
+        div()
+            .w_full()
+            .child(self.render_menu_item(is_submenu, is_active, is_open, cx))
+            .when(is_open, |this| {
+                this.map(|this| match self {
+                    SidebarMenuItem::Submenu {
+                        items,
+                        is_collapsed,
+                        ..
+                    } => {
+                        if is_collapsed {
+                            this
+                        } else {
+                            this.child(
+                                v_flex()
+                                    .border_l_1()
+                                    .border_color(cx.theme().sidebar_border)
+                                    .gap_1()
+                                    .mx_3p5()
+                                    .px_2p5()
+                                    .py_0p5()
+                                    .children(items),
+                            )
+                        }
+                    }
+                    _ => this,
+                })
+            })
+    }
+}

crates/ui/src/sidebar/mod.rs

@@ -0,0 +1,212 @@
+use crate::{
+    button::{Button, ButtonVariants},
+    h_flex,
+    scroll::ScrollbarAxis,
+    theme::ActiveTheme,
+    v_flex, Collapsible, Icon, IconName, Side, Sizable, StyledExt,
+};
+use gpui::{
+    div, prelude::FluentBuilder, px, AnyElement, ClickEvent, Entity, EntityId,
+    InteractiveElement as _, IntoElement, ParentElement, Pixels, Render, RenderOnce, Styled, View,
+    WindowContext,
+};
+use std::rc::Rc;
+
+mod footer;
+mod group;
+mod header;
+mod menu;
+pub use footer::*;
+pub use group::*;
+pub use header::*;
+pub use menu::*;
+
+const DEFAULT_WIDTH: Pixels = px(255.);
+const COLLAPSED_WIDTH: Pixels = px(48.);
+
+/// A sidebar
+#[derive(IntoElement)]
+pub struct Sidebar<E: Collapsible + IntoElement + 'static> {
+    /// The parent view id
+    view_id: EntityId,
+    content: Vec<E>,
+    /// header view
+    header: Option<AnyElement>,
+    /// footer view
+    footer: Option<AnyElement>,
+    /// The side of the sidebar
+    side: Side,
+    collapsible: bool,
+    width: Pixels,
+    is_collapsed: bool,
+}
+
+impl<E: Collapsible + IntoElement> Sidebar<E> {
+    fn new(view_id: EntityId, side: Side) -> Self {
+        Self {
+            view_id,
+            content: vec![],
+            header: None,
+            footer: None,
+            side,
+            collapsible: true,
+            width: DEFAULT_WIDTH,
+            is_collapsed: false,
+        }
+    }
+
+    pub fn left<V: Render + 'static>(view: &View<V>) -> Self {
+        Self::new(view.entity_id(), Side::Left)
+    }
+
+    pub fn right<V: Render + 'static>(view: &View<V>) -> Self {
+        Self::new(view.entity_id(), Side::Right)
+    }
+
+    /// Set the width of the sidebar
+    pub fn width(mut self, width: Pixels) -> Self {
+        self.width = width;
+        self
+    }
+
+    /// Set the sidebar to be collapsible, default is true
+    pub fn collapsible(mut self, collapsible: bool) -> Self {
+        self.collapsible = collapsible;
+        self
+    }
+
+    /// Set the sidebar to be collapsed
+    pub fn collapsed(mut self, collapsed: bool) -> Self {
+        self.is_collapsed = collapsed;
+        self
+    }
+
+    /// Set the header of the sidebar.
+    pub fn header(mut self, header: impl IntoElement) -> Self {
+        self.header = Some(header.into_any_element());
+        self
+    }
+
+    /// Set the footer of the sidebar.
+    pub fn footer(mut self, footer: impl IntoElement) -> Self {
+        self.footer = Some(footer.into_any_element());
+        self
+    }
+
+    /// Add a child element to the sidebar, the child must implement `Collapsible`
+    pub fn child(mut self, child: E) -> Self {
+        self.content.push(child);
+        self
+    }
+
+    /// Add multiple children to the sidebar, the children must implement `Collapsible`
+    pub fn children(mut self, children: impl IntoIterator<Item = E>) -> Self {
+        self.content.extend(children);
+        self
+    }
+}
+
+/// Sidebar collapse button with Icon.
+#[derive(IntoElement)]
+pub struct SidebarToggleButton {
+    btn: Button,
+    is_collapsed: bool,
+    side: Side,
+    on_click: Option<Rc<dyn Fn(&ClickEvent, &mut WindowContext)>>,
+}
+
+impl SidebarToggleButton {
+    fn new(side: Side) -> Self {
+        Self {
+            btn: Button::new("sidebar-collapse").ghost().small(),
+            is_collapsed: false,
+            side,
+            on_click: None,
+        }
+    }
+
+    pub fn left() -> Self {
+        Self::new(Side::Left)
+    }
+
+    pub fn right() -> Self {
+        Self::new(Side::Right)
+    }
+
+    pub fn collapsed(mut self, is_collapsed: bool) -> Self {
+        self.is_collapsed = is_collapsed;
+        self
+    }
+
+    pub fn on_click(
+        mut self,
+        on_click: impl Fn(&ClickEvent, &mut WindowContext) + 'static,
+    ) -> Self {
+        self.on_click = Some(Rc::new(on_click));
+        self
+    }
+}
+
+impl RenderOnce for SidebarToggleButton {
+    fn render(self, _: &mut WindowContext) -> impl IntoElement {
+        let is_collapsed = self.is_collapsed;
+        let on_click = self.on_click.clone();
+
+        let icon = if is_collapsed {
+            if self.side.is_left() {
+                IconName::PanelLeftOpen
+            } else {
+                IconName::PanelRightOpen
+            }
+        } else {
+            if self.side.is_left() {
+                IconName::PanelLeftClose
+            } else {
+                IconName::PanelRightClose
+            }
+        };
+
+        self.btn
+            .when_some(on_click, |this, on_click| {
+                this.on_click(move |ev, cx| {
+                    on_click(ev, cx);
+                })
+            })
+            .icon(Icon::new(icon).size_4())
+    }
+}
+
+impl<E: Collapsible + IntoElement> RenderOnce for Sidebar<E> {
+    fn render(mut self, cx: &mut WindowContext) -> impl IntoElement {
+        let is_collaped = self.is_collapsed;
+        v_flex()
+            .id("sidebar")
+            .w(self.width)
+            .when(self.is_collapsed, |this| this.w(COLLAPSED_WIDTH))
+            .flex_shrink_0()
+            .h_full()
+            .overflow_hidden()
+            .relative()
+            .bg(cx.theme().sidebar)
+            .text_color(cx.theme().sidebar_foreground)
+            .border_color(cx.theme().sidebar_border)
+            .map(|this| match self.side {
+                Side::Left => this.border_r_1(),
+                Side::Right => this.text_2xl(),
+            })
+            .when_some(self.header.take(), |this, header| {
+                this.child(h_flex().id("header").p_2().gap_2().child(header))
+            })
+            .child(
+                v_flex().id("content").flex_1().min_h_0().child(
+                    div()
+                        .children(self.content.into_iter().map(|c| c.collapsed(is_collaped)))
+                        .gap_2()
+                        .scrollable(self.view_id, ScrollbarAxis::Vertical),
+                ),
+            )
+            .when_some(self.footer.take(), |this, footer| {
+                this.child(h_flex().id("footer").gap_2().p_2().child(footer))
+            })
+    }
+}

crates/ui/src/skeleton.rs

@@ -0,0 +1,42 @@
+use crate::theme::ActiveTheme;
+use gpui::{
+    bounce, div, ease_in_out, Animation, AnimationExt, Div, IntoElement, ParentElement as _,
+    RenderOnce, Styled,
+};
+use std::time::Duration;
+
+#[derive(IntoElement)]
+pub struct Skeleton {
+    base: Div,
+}
+
+impl Skeleton {
+    pub fn new() -> Self {
+        Self {
+            base: div().w_full().h_4().rounded_md(),
+        }
+    }
+}
+
+impl Styled for Skeleton {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl RenderOnce for Skeleton {
+    fn render(self, cx: &mut gpui::WindowContext) -> impl IntoElement {
+        div().child(
+            self.base.bg(cx.theme().skeleton).with_animation(
+                "skeleton",
+                Animation::new(Duration::from_secs(2))
+                    .repeat()
+                    .with_easing(bounce(ease_in_out)),
+                move |this, delta| {
+                    let v = 1.0 - delta * 0.5;
+                    this.opacity(v)
+                },
+            ),
+        )
+    }
+}

crates/ui/src/slider.rs

@@ -0,0 +1,196 @@
+use crate::{theme::ActiveTheme, tooltip::Tooltip};
+use gpui::{
+    canvas, div, prelude::FluentBuilder as _, px, relative, Axis, Bounds, DragMoveEvent, EntityId,
+    EventEmitter, InteractiveElement, IntoElement, MouseButton, MouseDownEvent, ParentElement as _,
+    Pixels, Point, Render, StatefulInteractiveElement as _, Styled, ViewContext,
+    VisualContext as _,
+};
+
+#[derive(Clone, Render)]
+pub struct DragThumb(EntityId);
+
+pub enum SliderEvent {
+    Change(f32),
+}
+
+/// A Slider element.
+pub struct Slider {
+    axis: Axis,
+    min: f32,
+    max: f32,
+    step: f32,
+    value: f32,
+    bounds: Bounds<Pixels>,
+}
+
+impl Slider {
+    fn new(axis: Axis) -> Self {
+        Self {
+            axis,
+            min: 0.0,
+            max: 100.0,
+            step: 1.0,
+            value: 0.0,
+            bounds: Bounds::default(),
+        }
+    }
+
+    pub fn horizontal() -> Self {
+        Self::new(Axis::Horizontal)
+    }
+
+    /// Set the minimum value of the slider, default: 0.0
+    pub fn min(mut self, min: f32) -> Self {
+        self.min = min;
+        self
+    }
+
+    /// Set the maximum value of the slider, default: 100.0
+    pub fn max(mut self, max: f32) -> Self {
+        self.max = max;
+        self
+    }
+
+    /// Set the step value of the slider, default: 1.0
+    pub fn step(mut self, step: f32) -> Self {
+        self.step = step;
+        self
+    }
+
+    /// Set the default value of the slider, default: 0.0
+    pub fn default_value(mut self, value: f32) -> Self {
+        self.value = value;
+        self
+    }
+
+    /// Set the value of the slider.
+    pub fn set_value(&mut self, value: f32, cx: &mut gpui::ViewContext<Self>) {
+        self.value = value;
+        cx.notify();
+    }
+
+    /// Return percentage value of the slider, range of 0.0..1.0
+    fn relative_value(&self) -> f32 {
+        let step = self.step;
+        let value = self.value;
+        let min = self.min;
+        let max = self.max;
+
+        let relative_value = (value - min) / (max - min);
+        let relative_step = step / (max - min);
+
+        let relative_value = (relative_value / relative_step).round() * relative_step;
+        relative_value.clamp(0.0, 1.0)
+    }
+
+    /// Update value by mouse position
+    fn update_value_by_position(
+        &mut self,
+        position: Point<Pixels>,
+        cx: &mut gpui::ViewContext<Self>,
+    ) {
+        let bounds = self.bounds;
+        let axis = self.axis;
+        let min = self.min;
+        let max = self.max;
+        let step = self.step;
+
+        let value = match axis {
+            Axis::Horizontal => {
+                let relative = (position.x - bounds.left()) / bounds.size.width;
+                min + (max - min) * relative
+            }
+            Axis::Vertical => {
+                let relative = (position.y - bounds.top()) / bounds.size.height;
+                max - (max - min) * relative
+            }
+        };
+
+        let value = (value / step).round() * step;
+
+        self.value = value.clamp(self.min, self.max);
+        cx.emit(SliderEvent::Change(self.value));
+        cx.notify();
+    }
+
+    fn render_thumb(&self, cx: &mut ViewContext<Self>) -> impl gpui::IntoElement {
+        let value = self.value;
+        let entity_id = cx.entity_id();
+
+        div()
+            .id("slider-thumb")
+            .on_drag(DragThumb(entity_id), |drag, _, cx| {
+                cx.stop_propagation();
+                cx.new_view(|_| drag.clone())
+            })
+            .on_drag_move(cx.listener(
+                move |view, e: &DragMoveEvent<DragThumb>, cx| match e.drag(cx) {
+                    DragThumb(id) => {
+                        if *id != entity_id {
+                            return;
+                        }
+
+                        // set value by mouse position
+                        view.update_value_by_position(e.event.position, cx)
+                    }
+                },
+            ))
+            .absolute()
+            .top(px(-5.))
+            .left(relative(self.relative_value()))
+            .ml(-px(8.))
+            .size_4()
+            .rounded_full()
+            .border_1()
+            .border_color(cx.theme().slider_bar.opacity(0.9))
+            .when(cx.theme().shadow, |this| this.shadow_md())
+            .bg(cx.theme().slider_thumb)
+            .tooltip(move |cx| Tooltip::new(format!("{}", value), cx))
+    }
+
+    fn on_mouse_down(&mut self, event: &MouseDownEvent, cx: &mut gpui::ViewContext<Self>) {
+        self.update_value_by_position(event.position, cx);
+    }
+}
+
+impl EventEmitter<SliderEvent> for Slider {}
+
+impl Render for Slider {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        div()
+            .id("slider")
+            .on_mouse_down(MouseButton::Left, cx.listener(Self::on_mouse_down))
+            .h_5()
+            .child(
+                div()
+                    .id("slider-bar")
+                    .relative()
+                    .w_full()
+                    .my_1p5()
+                    .h_1p5()
+                    .bg(cx.theme().slider_bar.opacity(0.2))
+                    .active(|this| this.bg(cx.theme().slider_bar.opacity(0.4)))
+                    .rounded(px(3.))
+                    .child(
+                        div()
+                            .absolute()
+                            .top_0()
+                            .left_0()
+                            .h_full()
+                            .w(relative(self.relative_value()))
+                            .bg(cx.theme().slider_bar)
+                            .rounded_l(px(3.)),
+                    )
+                    .child(self.render_thumb(cx))
+                    .child({
+                        let view = cx.view().clone();
+                        canvas(
+                            move |bounds, cx| view.update(cx, |r, _| r.bounds = bounds),
+                            |_, _, _| {},
+                        )
+                        .absolute()
+                        .size_full()
+                    }),
+            )
+    }
+}

crates/ui/src/styled.rs

@@ -0,0 +1,426 @@
+use std::fmt::{self, Display, Formatter};
+
+use crate::{
+    scroll::{Scrollable, ScrollbarAxis},
+    theme::ActiveTheme,
+};
+use gpui::{
+    div, px, Axis, Div, Edges, Element, ElementId, EntityId, FocusHandle, Pixels, Styled,
+    WindowContext,
+};
+use serde::{Deserialize, Serialize};
+
+/// Returns a `Div` as horizontal flex layout.
+pub fn h_flex() -> Div {
+    div().h_flex()
+}
+
+/// Returns a `Div` as vertical flex layout.
+pub fn v_flex() -> Div {
+    div().v_flex()
+}
+
+macro_rules! font_weight {
+    ($fn:ident, $const:ident) => {
+        /// [docs](https://tailwindcss.com/docs/font-weight)
+        fn $fn(self) -> Self {
+            self.font_weight(gpui::FontWeight::$const)
+        }
+    };
+}
+
+/// Extends [`gpui::Styled`] with specific styling methods.
+pub trait StyledExt: Styled + Sized {
+    /// Apply self into a horizontal flex layout.
+    fn h_flex(self) -> Self {
+        self.flex().flex_row().items_center()
+    }
+
+    /// Apply self into a vertical flex layout.
+    fn v_flex(self) -> Self {
+        self.flex().flex_col()
+    }
+
+    /// Render a border with a width of 1px, color red
+    fn debug_red(self) -> Self {
+        if cfg!(debug_assertions) {
+            self.border_1().border_color(crate::red_500())
+        } else {
+            self
+        }
+    }
+
+    /// Render a border with a width of 1px, color blue
+    fn debug_blue(self) -> Self {
+        if cfg!(debug_assertions) {
+            self.border_1().border_color(crate::blue_500())
+        } else {
+            self
+        }
+    }
+
+    /// Render a border with a width of 1px, color yellow
+    fn debug_yellow(self) -> Self {
+        if cfg!(debug_assertions) {
+            self.border_1().border_color(crate::yellow_500())
+        } else {
+            self
+        }
+    }
+
+    /// Render a border with a width of 1px, color green
+    fn debug_green(self) -> Self {
+        if cfg!(debug_assertions) {
+            self.border_1().border_color(crate::green_500())
+        } else {
+            self
+        }
+    }
+
+    /// Render a border with a width of 1px, color pink
+    fn debug_pink(self) -> Self {
+        if cfg!(debug_assertions) {
+            self.border_1().border_color(crate::pink_500())
+        } else {
+            self
+        }
+    }
+
+    /// Render a 1px blue border, when if the element is focused
+    fn debug_focused(self, focus_handle: &FocusHandle, cx: &WindowContext) -> Self {
+        if cfg!(debug_assertions) {
+            if focus_handle.contains_focused(cx) {
+                self.debug_blue()
+            } else {
+                self
+            }
+        } else {
+            self
+        }
+    }
+
+    /// Render a border with a width of 1px, color ring color
+    fn outline(self, cx: &WindowContext) -> Self {
+        self.border_color(cx.theme().ring)
+    }
+
+    /// Wraps the element in a ScrollView.
+    ///
+    /// Current this is only have a vertical scrollbar.
+    fn scrollable(self, view_id: EntityId, axis: ScrollbarAxis) -> Scrollable<Self>
+    where
+        Self: Element,
+    {
+        Scrollable::new(view_id, self, axis)
+    }
+
+    font_weight!(font_thin, THIN);
+    font_weight!(font_extralight, EXTRA_LIGHT);
+    font_weight!(font_light, LIGHT);
+    font_weight!(font_normal, NORMAL);
+    font_weight!(font_medium, MEDIUM);
+    font_weight!(font_semibold, SEMIBOLD);
+    font_weight!(font_bold, BOLD);
+    font_weight!(font_extrabold, EXTRA_BOLD);
+    font_weight!(font_black, BLACK);
+
+    /// Set as Popover style
+    fn popover_style(self, cx: &mut WindowContext) -> Self {
+        self.bg(cx.theme().popover)
+            .border_1()
+            .border_color(cx.theme().border)
+            .shadow_lg()
+            .rounded(px(cx.theme().radius))
+    }
+}
+
+impl<E: Styled> StyledExt for E {}
+
+/// A size for elements.
+#[derive(Clone, Default, Copy, PartialEq, Eq, Debug, Deserialize, Serialize)]
+pub enum Size {
+    Size(Pixels),
+    XSmall,
+    Small,
+    #[default]
+    Medium,
+    Large,
+}
+
+impl Size {
+    /// Returns the height for table row.
+    pub fn table_row_height(&self) -> Pixels {
+        match self {
+            Size::XSmall => px(26.),
+            Size::Small => px(30.),
+            Size::Large => px(40.),
+            _ => px(32.),
+        }
+    }
+    /// Returns the padding for a table cell.
+    pub fn table_cell_padding(&self) -> Edges<Pixels> {
+        match self {
+            Size::XSmall => Edges {
+                top: px(2.),
+                bottom: px(2.),
+                left: px(4.),
+                right: px(4.),
+            },
+            Size::Small => Edges {
+                top: px(3.),
+                bottom: px(3.),
+                left: px(6.),
+                right: px(6.),
+            },
+            Size::Large => Edges {
+                top: px(8.),
+                bottom: px(8.),
+                left: px(12.),
+                right: px(12.),
+            },
+            _ => Edges {
+                top: px(4.),
+                bottom: px(4.),
+                left: px(8.),
+                right: px(8.),
+            },
+        }
+    }
+}
+
+impl From<Pixels> for Size {
+    fn from(size: Pixels) -> Self {
+        Size::Size(size)
+    }
+}
+
+/// A trait for defining element that can be selected.
+pub trait Selectable: Sized {
+    fn element_id(&self) -> &ElementId;
+    /// Set the selected state of the element.
+    fn selected(self, selected: bool) -> Self;
+}
+
+/// A trait for defining element that can be disabled.
+pub trait Disableable {
+    /// Set the disabled state of the element.
+    fn disabled(self, disabled: bool) -> Self;
+}
+
+/// A trait for setting the size of an element.
+pub trait Sizable: Sized {
+    /// Set the ui::Size of this element.
+    ///
+    /// Also can receive a `ButtonSize` to convert to `IconSize`,
+    /// Or a `Pixels` to set a custom size: `px(30.)`
+    fn with_size(self, size: impl Into<Size>) -> Self;
+
+    /// Set to Size::Small
+    fn small(self) -> Self {
+        self.with_size(Size::Small)
+    }
+
+    /// Set to Size::XSmall
+    fn xsmall(self) -> Self {
+        self.with_size(Size::XSmall)
+    }
+
+    /// Set to Size::Medium
+    fn large(self) -> Self {
+        self.with_size(Size::Large)
+    }
+}
+
+#[allow(unused)]
+pub trait StyleSized<T: Styled> {
+    fn input_text_size(self, size: Size) -> Self;
+    fn input_size(self, size: Size) -> Self;
+    fn input_pl(self, size: Size) -> Self;
+    fn input_pr(self, size: Size) -> Self;
+    fn input_px(self, size: Size) -> Self;
+    fn input_py(self, size: Size) -> Self;
+    fn input_h(self, size: Size) -> Self;
+    fn list_size(self, size: Size) -> Self;
+    fn list_px(self, size: Size) -> Self;
+    fn list_py(self, size: Size) -> Self;
+    /// Apply size with the given `Size`.
+    fn size_with(self, size: Size) -> Self;
+    /// Apply the table cell size (Font size, padding) with the given `Size`.
+    fn table_cell_size(self, size: Size) -> Self;
+}
+
+impl<T: Styled> StyleSized<T> for T {
+    fn input_text_size(self, size: Size) -> Self {
+        match size {
+            Size::XSmall => self.text_xs(),
+            Size::Small => self.text_sm(),
+            Size::Medium => self.text_base(),
+            Size::Large => self.text_lg(),
+            Size::Size(size) => self.text_size(size),
+        }
+    }
+
+    fn input_size(self, size: Size) -> Self {
+        self.input_px(size).input_py(size).input_h(size)
+    }
+
+    fn input_pl(self, size: Size) -> Self {
+        match size {
+            Size::Large => self.pl_5(),
+            Size::Medium => self.pl_3(),
+            _ => self.pl_2(),
+        }
+    }
+
+    fn input_pr(self, size: Size) -> Self {
+        match size {
+            Size::Large => self.pr_5(),
+            Size::Medium => self.pr_3(),
+            _ => self.pr_2(),
+        }
+    }
+
+    fn input_px(self, size: Size) -> Self {
+        match size {
+            Size::Large => self.px_5(),
+            Size::Medium => self.px_3(),
+            _ => self.px_2(),
+        }
+    }
+
+    fn input_py(self, size: Size) -> Self {
+        match size {
+            Size::Large => self.py_5(),
+            Size::Medium => self.py_2(),
+            _ => self.py_1(),
+        }
+    }
+
+    fn input_h(self, size: Size) -> Self {
+        match size {
+            Size::Large => self.h_11(),
+            Size::Medium => self.h_8(),
+            _ => self.h(px(26.)),
+        }
+        .input_text_size(size)
+    }
+
+    fn list_size(self, size: Size) -> Self {
+        self.list_px(size).list_py(size).input_text_size(size)
+    }
+
+    fn list_px(self, size: Size) -> Self {
+        match size {
+            Size::Small => self.px_2(),
+            _ => self.px_3(),
+        }
+    }
+
+    fn list_py(self, size: Size) -> Self {
+        match size {
+            Size::Large => self.py_2(),
+            Size::Medium => self.py_1(),
+            Size::Small => self.py_0p5(),
+            _ => self.py_1(),
+        }
+    }
+
+    fn size_with(self, size: Size) -> Self {
+        match size {
+            Size::Large => self.size_11(),
+            Size::Medium => self.size_8(),
+            Size::Small => self.size_5(),
+            Size::XSmall => self.size_4(),
+            Size::Size(size) => self.size(size),
+        }
+    }
+
+    fn table_cell_size(self, size: Size) -> Self {
+        let padding = size.table_cell_padding();
+        match size {
+            Size::XSmall => self.text_sm(),
+            Size::Small => self.text_sm(),
+            _ => self,
+        }
+        .pl(padding.left)
+        .pr(padding.right)
+        .pt(padding.top)
+        .pb(padding.bottom)
+    }
+}
+
+pub trait AxisExt {
+    fn is_horizontal(self) -> bool;
+    fn is_vertical(self) -> bool;
+}
+
+impl AxisExt for Axis {
+    fn is_horizontal(self) -> bool {
+        self == Axis::Horizontal
+    }
+
+    fn is_vertical(self) -> bool {
+        self == Axis::Vertical
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+pub enum Placement {
+    Top,
+    Bottom,
+    Left,
+    Right,
+}
+
+impl Display for Placement {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        match self {
+            Placement::Top => write!(f, "Top"),
+            Placement::Bottom => write!(f, "Bottom"),
+            Placement::Left => write!(f, "Left"),
+            Placement::Right => write!(f, "Right"),
+        }
+    }
+}
+
+impl Placement {
+    pub fn is_horizontal(&self) -> bool {
+        match self {
+            Placement::Left | Placement::Right => true,
+            _ => false,
+        }
+    }
+
+    pub fn is_vertical(&self) -> bool {
+        match self {
+            Placement::Top | Placement::Bottom => true,
+            _ => false,
+        }
+    }
+
+    pub fn axis(&self) -> Axis {
+        match self {
+            Placement::Top | Placement::Bottom => Axis::Vertical,
+            Placement::Left | Placement::Right => Axis::Horizontal,
+        }
+    }
+}
+
+/// A enum for defining the side of the element.
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+pub enum Side {
+    Left,
+    Right,
+}
+
+impl Side {
+    pub(crate) fn is_left(&self) -> bool {
+        matches!(self, Self::Left)
+    }
+}
+
+/// A trait for defining element that can be collapsed.
+pub trait Collapsible {
+    fn collapsed(self, collapsed: bool) -> Self;
+    fn is_collapsed(&self) -> bool;
+}

crates/ui/src/svg_img.rs

@@ -0,0 +1,295 @@
+use std::{
+    hash::Hash,
+    ops::Deref,
+    sync::{Arc, LazyLock},
+};
+
+use gpui::{
+    px, size, AppContext, Asset, Bounds, Element, Hitbox, ImageCacheError, InteractiveElement,
+    Interactivity, IntoElement, IsZero, Pixels, RenderImage, SharedString, Size, StyleRefinement,
+    Styled, WindowContext,
+};
+use image::Frame;
+use smallvec::SmallVec;
+
+use image::ImageBuffer;
+
+use crate::Assets;
+
+const SCALE: f32 = 2.;
+const FONT_PATH: &str = "fonts/NotoSans-Regular.ttf";
+static OPTIONS: LazyLock<usvg::Options> = LazyLock::new(|| {
+    let mut options = usvg::Options::default();
+    if let Some(font_data) = Assets::get(FONT_PATH).map(|f| f.data) {
+        options.fontdb_mut().load_font_data(font_data.into());
+    }
+    options
+});
+
+#[derive(Debug, Clone, Hash)]
+pub enum SvgSource {
+    /// A svg bytes
+    Data(Arc<[u8]>),
+    /// An asset path
+    Path(SharedString),
+}
+
+impl From<&[u8]> for SvgSource {
+    fn from(data: &[u8]) -> Self {
+        Self::Data(data.into())
+    }
+}
+
+impl From<Arc<[u8]>> for SvgSource {
+    fn from(data: Arc<[u8]>) -> Self {
+        Self::Data(data)
+    }
+}
+
+impl From<SharedString> for SvgSource {
+    fn from(path: SharedString) -> Self {
+        Self::Path(path)
+    }
+}
+
+impl From<&'static str> for SvgSource {
+    fn from(path: &'static str) -> Self {
+        Self::Path(path.into())
+    }
+}
+
+impl Clone for SvgImg {
+    fn clone(&self) -> Self {
+        Self {
+            interactivity: Interactivity::default(),
+            source: self.source.clone(),
+            size: self.size,
+        }
+    }
+}
+
+enum Image {}
+
+#[derive(Debug, Clone)]
+struct ImageSource {
+    source: SvgSource,
+    size: Size<Pixels>,
+}
+
+impl Hash for ImageSource {
+    /// Hash to to control the Asset cache
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.source.hash(state);
+    }
+}
+
+impl Asset for Image {
+    type Source = ImageSource;
+    type Output = Result<Arc<RenderImage>, ImageCacheError>;
+
+    fn load(
+        source: Self::Source,
+        cx: &mut AppContext,
+    ) -> impl std::future::Future<Output = Self::Output> + Send + 'static {
+        let asset_source = cx.asset_source().clone();
+
+        async move {
+            let size = source.size;
+            if size.width.is_zero() || size.height.is_zero() {
+                return Err(usvg::Error::InvalidSize.into());
+            }
+            let size = Size {
+                width: (size.width * SCALE).ceil(),
+                height: (size.height * SCALE).ceil(),
+            };
+
+            let bytes = match source.source {
+                SvgSource::Data(data) => data,
+                SvgSource::Path(path) => {
+                    if let Ok(Some(data)) = asset_source.load(&path) {
+                        data.deref().to_vec().into()
+                    } else {
+                        Err(std::io::Error::other(format!(
+                            "failed to load svg image from path: {}",
+                            path
+                        )))
+                        .map_err(|e| ImageCacheError::Io(Arc::new(e)))?
+                    }
+                }
+            };
+
+            let tree = usvg::Tree::from_data(&bytes, &OPTIONS)?;
+
+            let mut pixmap =
+                resvg::tiny_skia::Pixmap::new(size.width.0 as u32, size.height.0 as u32)
+                    .ok_or(usvg::Error::InvalidSize)?;
+
+            let transform = resvg::tiny_skia::Transform::from_scale(SCALE, SCALE);
+
+            resvg::render(&tree, transform, &mut pixmap.as_mut());
+
+            let mut buffer = ImageBuffer::from_raw(pixmap.width(), pixmap.height(), pixmap.take())
+                .expect("invalid svg image buffer");
+
+            // Convert from RGBA with premultiplied alpha to BGRA with straight alpha.
+            for pixel in buffer.chunks_exact_mut(4) {
+                pixel.swap(0, 2);
+                if pixel[3] > 0 {
+                    let a = pixel[3] as f32 / 255.;
+                    pixel[0] = (pixel[0] as f32 / a) as u8;
+                    pixel[1] = (pixel[1] as f32 / a) as u8;
+                    pixel[2] = (pixel[2] as f32 / a) as u8;
+                }
+            }
+
+            Ok(Arc::new(RenderImage::new(SmallVec::from_elem(
+                Frame::new(buffer),
+                1,
+            ))))
+        }
+    }
+}
+
+pub struct SvgImg {
+    interactivity: Interactivity,
+    source: Option<SvgSource>,
+    size: Size<Pixels>,
+}
+
+impl SvgImg {
+    /// Create a new svg image element.
+    ///
+    /// The `src_width` and `src_height` are the original width and height of the svg image.
+    pub fn new() -> Self {
+        Self {
+            interactivity: Interactivity::default(),
+            source: None,
+            size: Size::default(),
+        }
+    }
+
+    /// Set the path of the svg image from the asset.
+    ///
+    /// The `size` argument is the size of the original svg image.
+    #[must_use]
+    pub fn source(
+        mut self,
+        source: impl Into<SvgSource>,
+        width: impl Into<Pixels>,
+        height: impl Into<Pixels>,
+    ) -> Self {
+        self.source = Some(source.into());
+        self.size = size(width.into(), height.into());
+        self
+    }
+}
+
+impl IntoElement for SvgImg {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+impl Element for SvgImg {
+    type RequestLayoutState = ();
+    type PrepaintState = Option<Hitbox>;
+
+    fn id(&self) -> Option<gpui::ElementId> {
+        self.interactivity.element_id.clone()
+    }
+
+    fn request_layout(
+        &mut self,
+        global_id: Option<&gpui::GlobalElementId>,
+        cx: &mut WindowContext,
+    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
+        let layout_id = self
+            .interactivity
+            .request_layout(global_id, cx, |style, cx| cx.request_layout(style, None));
+
+        (layout_id, ())
+    }
+
+    fn prepaint(
+        &mut self,
+        global_id: Option<&gpui::GlobalElementId>,
+        bounds: gpui::Bounds<gpui::Pixels>,
+        _: &mut Self::RequestLayoutState,
+        cx: &mut WindowContext,
+    ) -> Self::PrepaintState {
+        self.interactivity
+            .prepaint(global_id, bounds, bounds.size, cx, |_, _, hitbox, _| hitbox)
+    }
+
+    fn paint(
+        &mut self,
+        global_id: Option<&gpui::GlobalElementId>,
+        bounds: gpui::Bounds<gpui::Pixels>,
+        _: &mut Self::RequestLayoutState,
+        hitbox: &mut Self::PrepaintState,
+        cx: &mut WindowContext,
+    ) {
+        let source = self.source.clone();
+
+        self.interactivity
+            .paint(global_id, bounds, hitbox.as_ref(), cx, |_style, cx| {
+                let size = self.size;
+
+                let data = if let Some(source) = source {
+                    match cx.use_asset::<Image>(&ImageSource { source, size }) {
+                        Some(Ok(data)) => Some(data),
+                        _ => None,
+                    }
+                } else {
+                    None
+                };
+
+                if let Some(data) = data {
+                    // To calculate the ratio of the original image size to the container bounds size.
+                    // Scale by shortest side (width or height) to get a fit image.
+                    // And center the image in the container bounds.
+                    let ratio = if bounds.size.width < bounds.size.height {
+                        bounds.size.width / size.width
+                    } else {
+                        bounds.size.height / size.height
+                    };
+
+                    let ratio = ratio.min(1.0);
+
+                    let new_size = gpui::Size {
+                        width: size.width * ratio,
+                        height: size.height * ratio,
+                    };
+                    let new_origin = gpui::Point {
+                        x: bounds.origin.x + px(((bounds.size.width - new_size.width) / 2.).into()),
+                        y: bounds.origin.y
+                            + px(((bounds.size.height - new_size.height) / 2.).into()),
+                    };
+
+                    let img_bounds = Bounds {
+                        origin: new_origin.map(|origin| origin.floor()),
+                        size: new_size.map(|size| size.ceil()),
+                    };
+
+                    match cx.paint_image(img_bounds, px(0.).into(), data, 0, false) {
+                        Ok(_) => {}
+                        Err(err) => eprintln!("failed to paint svg image: {:?}", err),
+                    }
+                }
+            })
+    }
+}
+
+impl Styled for SvgImg {
+    fn style(&mut self) -> &mut StyleRefinement {
+        &mut self.interactivity.base_style
+    }
+}
+
+impl InteractiveElement for SvgImg {
+    fn interactivity(&mut self) -> &mut Interactivity {
+        &mut self.interactivity
+    }
+}

crates/ui/src/switch.rs

@@ -0,0 +1,234 @@
+use crate::{h_flex, theme::ActiveTheme, Disableable, Side, Sizable, Size};
+use gpui::{
+    div, prelude::FluentBuilder as _, px, Animation, AnimationExt as _, AnyElement, Element,
+    ElementId, GlobalElementId, InteractiveElement, IntoElement, LayoutId, ParentElement as _,
+    SharedString, Styled as _, WindowContext,
+};
+use std::{cell::RefCell, rc::Rc, time::Duration};
+
+pub struct Switch {
+    id: ElementId,
+    checked: bool,
+    disabled: bool,
+    label: Option<SharedString>,
+    label_side: Side,
+    on_click: Option<Rc<dyn Fn(&bool, &mut WindowContext)>>,
+    size: Size,
+}
+
+impl Switch {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        let id: ElementId = id.into();
+        Self {
+            id: id.clone(),
+            checked: false,
+            disabled: false,
+            label: None,
+            on_click: None,
+            label_side: Side::Right,
+            size: Size::Medium,
+        }
+    }
+
+    pub fn checked(mut self, checked: bool) -> Self {
+        self.checked = checked;
+        self
+    }
+
+    pub fn label(mut self, label: impl Into<SharedString>) -> Self {
+        self.label = Some(label.into());
+        self
+    }
+
+    pub fn on_click<F>(mut self, handler: F) -> Self
+    where
+        F: Fn(&bool, &mut WindowContext) + 'static,
+    {
+        self.on_click = Some(Rc::new(handler));
+        self
+    }
+
+    pub fn label_side(mut self, label_side: Side) -> Self {
+        self.label_side = label_side;
+        self
+    }
+}
+
+impl Sizable for Switch {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+
+impl Disableable for Switch {
+    fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+}
+
+impl IntoElement for Switch {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+#[derive(Default)]
+pub struct SwitchState {
+    prev_checked: Rc<RefCell<Option<bool>>>,
+}
+
+impl Element for Switch {
+    type RequestLayoutState = AnyElement;
+
+    type PrepaintState = ();
+
+    fn id(&self) -> Option<ElementId> {
+        Some(self.id.clone())
+    }
+
+    fn request_layout(
+        &mut self,
+        global_id: Option<&GlobalElementId>,
+        cx: &mut WindowContext,
+    ) -> (LayoutId, Self::RequestLayoutState) {
+        cx.with_element_state::<SwitchState, _>(global_id.unwrap(), move |state, cx| {
+            let state = state.unwrap_or_default();
+
+            let theme = cx.theme();
+            let checked = self.checked;
+            let on_click = self.on_click.clone();
+
+            let (bg, toggle_bg) = match self.checked {
+                true => (theme.primary, theme.background),
+                false => (theme.input, theme.background),
+            };
+
+            let (bg, toggle_bg) = match self.disabled {
+                true => (bg.opacity(0.3), toggle_bg.opacity(0.8)),
+                false => (bg, toggle_bg),
+            };
+
+            let (bg_width, bg_height) = match self.size {
+                Size::XSmall | Size::Small => (px(28.), px(16.)),
+                _ => (px(36.), px(20.)),
+            };
+            let bar_width = match self.size {
+                Size::XSmall | Size::Small => px(12.),
+                _ => px(16.),
+            };
+            let inset = px(2.);
+
+            let mut element = h_flex()
+                .id(self.id.clone())
+                .items_center()
+                .gap_2()
+                .when(self.label_side.is_left(), |this| this.flex_row_reverse())
+                .child(
+                    // Switch Bar
+                    div()
+                        .id(self.id.clone())
+                        .w(bg_width)
+                        .h(bg_height)
+                        .rounded(bg_height / 2.)
+                        .flex()
+                        .items_center()
+                        .border(inset)
+                        .border_color(theme.transparent)
+                        .bg(bg)
+                        .when(!self.disabled, |this| this.cursor_pointer())
+                        .child(
+                            // Switch Toggle
+                            div()
+                                .rounded_full()
+                                .bg(toggle_bg)
+                                .size(bar_width)
+                                .map(|this| {
+                                    let prev_checked = state.prev_checked.clone();
+                                    if !self.disabled
+                                        && prev_checked
+                                            .borrow()
+                                            .map_or(false, |prev| prev != checked)
+                                    {
+                                        let dur = Duration::from_secs_f64(0.15);
+                                        cx.spawn(|cx| async move {
+                                            cx.background_executor().timer(dur).await;
+
+                                            *prev_checked.borrow_mut() = Some(checked);
+                                        })
+                                        .detach();
+                                        this.with_animation(
+                                            ElementId::NamedInteger(
+                                                "move".into(),
+                                                checked as usize,
+                                            ),
+                                            Animation::new(dur),
+                                            move |this, delta| {
+                                                let max_x = bg_width - bar_width - inset * 2;
+                                                let x = if checked {
+                                                    max_x * delta
+                                                } else {
+                                                    max_x - max_x * delta
+                                                };
+                                                this.left(x)
+                                            },
+                                        )
+                                        .into_any_element()
+                                    } else {
+                                        let max_x = bg_width - bar_width - inset * 2;
+                                        let x = if checked { max_x } else { px(0.) };
+                                        this.left(x).into_any_element()
+                                    }
+                                }),
+                        ),
+                )
+                .when_some(self.label.clone(), |this, label| {
+                    this.child(div().child(label).map(|this| match self.size {
+                        Size::XSmall | Size::Small => this.text_sm(),
+                        _ => this.text_base(),
+                    }))
+                })
+                .when_some(
+                    on_click
+                        .as_ref()
+                        .map(|c| c.clone())
+                        .filter(|_| !self.disabled),
+                    |this, on_click| {
+                        let prev_checked = state.prev_checked.clone();
+                        this.on_mouse_down(gpui::MouseButton::Left, move |_, cx| {
+                            cx.stop_propagation();
+                            *prev_checked.borrow_mut() = Some(checked);
+                            on_click(&!checked, cx);
+                        })
+                    },
+                )
+                .into_any_element();
+
+            ((element.request_layout(cx), element), state)
+        })
+    }
+
+    fn prepaint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<gpui::Pixels>,
+        element: &mut Self::RequestLayoutState,
+        cx: &mut WindowContext,
+    ) {
+        element.prepaint(cx);
+    }
+
+    fn paint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<gpui::Pixels>,
+        element: &mut Self::RequestLayoutState,
+        _: &mut Self::PrepaintState,
+        cx: &mut WindowContext,
+    ) {
+        element.paint(cx)
+    }
+}

crates/ui/src/tab.rs

@@ -0,0 +1,5 @@
+mod tab;
+mod tab_bar;
+
+pub use tab::*;
+pub use tab_bar::*;

crates/ui/src/tab/tab.rs

@@ -0,0 +1,99 @@
+use crate::theme::ActiveTheme;
+use crate::Selectable;
+use gpui::prelude::FluentBuilder as _;
+use gpui::{
+    div, px, AnyElement, Div, ElementId, InteractiveElement, IntoElement, ParentElement as _,
+    RenderOnce, Stateful, StatefulInteractiveElement, Styled, WindowContext,
+};
+
+#[derive(IntoElement)]
+pub struct Tab {
+    id: ElementId,
+    base: Stateful<Div>,
+    label: AnyElement,
+    prefix: Option<AnyElement>,
+    suffix: Option<AnyElement>,
+    disabled: bool,
+    selected: bool,
+}
+
+impl Tab {
+    pub fn new(id: impl Into<ElementId>, label: impl IntoElement) -> Self {
+        let id: ElementId = id.into();
+        Self {
+            id: id.clone(),
+            base: div().id(id).gap_1().py_1p5().px_3().h(px(30.)),
+            label: label.into_any_element(),
+            disabled: false,
+            selected: false,
+            prefix: None,
+            suffix: None,
+        }
+    }
+
+    /// Set the left side of the tab
+    pub fn prefix(mut self, prefix: impl Into<AnyElement>) -> Self {
+        self.prefix = Some(prefix.into());
+        self
+    }
+
+    /// Set the right side of the tab
+    pub fn suffix(mut self, suffix: impl Into<AnyElement>) -> Self {
+        self.suffix = Some(suffix.into());
+        self
+    }
+}
+
+impl Selectable for Tab {
+    fn element_id(&self) -> &ElementId {
+        &self.id
+    }
+
+    fn selected(mut self, selected: bool) -> Self {
+        self.selected = selected;
+        self
+    }
+}
+
+impl InteractiveElement for Tab {
+    fn interactivity(&mut self) -> &mut gpui::Interactivity {
+        self.base.interactivity()
+    }
+}
+
+impl StatefulInteractiveElement for Tab {}
+
+impl Styled for Tab {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl RenderOnce for Tab {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let (text_color, bg_color) = match (self.selected, self.disabled) {
+            (true, _) => (cx.theme().tab_active_foreground, cx.theme().tab_active),
+            (false, true) => (cx.theme().tab_foreground.opacity(0.5), cx.theme().tab),
+            (false, false) => (cx.theme().muted_foreground, cx.theme().tab),
+        };
+
+        self.base
+            .flex()
+            .items_center()
+            .flex_shrink_0()
+            .cursor_pointer()
+            .overflow_hidden()
+            .text_color(text_color)
+            .bg(bg_color)
+            .border_x_1()
+            .border_color(cx.theme().transparent)
+            .when(self.selected, |this| this.border_color(cx.theme().border))
+            .text_sm()
+            .when(self.disabled, |this| this)
+            .when_some(self.prefix, |this, prefix| {
+                this.child(prefix).text_color(text_color)
+            })
+            .child(div().text_ellipsis().child(self.label))
+            .when_some(self.suffix, |this, suffix| this.child(suffix))
+    }
+}

crates/ui/src/tab/tab_bar.rs

@@ -0,0 +1,95 @@
+use crate::h_flex;
+use crate::theme::ActiveTheme;
+use gpui::prelude::FluentBuilder as _;
+use gpui::{
+    div, AnyElement, Div, ElementId, IntoElement, ParentElement, RenderOnce, ScrollHandle,
+    StatefulInteractiveElement as _, Styled, WindowContext,
+};
+use gpui::{px, InteractiveElement};
+use smallvec::SmallVec;
+
+#[derive(IntoElement)]
+pub struct TabBar {
+    base: Div,
+    id: ElementId,
+    scroll_handle: ScrollHandle,
+    prefix: Option<AnyElement>,
+    suffix: Option<AnyElement>,
+    children: SmallVec<[AnyElement; 2]>,
+}
+
+impl TabBar {
+    pub fn new(id: impl Into<ElementId>) -> Self {
+        Self {
+            base: div().px(px(-1.)),
+            id: id.into(),
+            children: SmallVec::new(),
+            scroll_handle: ScrollHandle::new(),
+            prefix: None,
+            suffix: None,
+        }
+    }
+
+    /// Track the scroll of the TabBar
+    pub fn track_scroll(mut self, scroll_handle: ScrollHandle) -> Self {
+        self.scroll_handle = scroll_handle;
+        self
+    }
+
+    /// Set the prefix element of the TabBar
+    pub fn prefix(mut self, prefix: impl IntoElement) -> Self {
+        self.prefix = Some(prefix.into_any_element());
+        self
+    }
+
+    /// Set the suffix element of the TabBar
+    pub fn suffix(mut self, suffix: impl IntoElement) -> Self {
+        self.suffix = Some(suffix.into_any_element());
+        self
+    }
+}
+
+impl ParentElement for TabBar {
+    fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
+        self.children.extend(elements)
+    }
+}
+
+impl Styled for TabBar {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl RenderOnce for TabBar {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        self.base
+            .id(self.id)
+            .group("tab-bar")
+            .relative()
+            .flex()
+            .flex_none()
+            .items_center()
+            .bg(cx.theme().tab_bar)
+            .text_color(cx.theme().tab_foreground)
+            .child(
+                div()
+                    .id("border-b")
+                    .absolute()
+                    .bottom_0()
+                    .size_full()
+                    .border_b_1()
+                    .border_color(cx.theme().border),
+            )
+            .when_some(self.prefix, |this, prefix| this.child(prefix))
+            .child(
+                h_flex()
+                    .id("tabs")
+                    .flex_grow()
+                    .overflow_x_scroll()
+                    .track_scroll(&self.scroll_handle)
+                    .children(self.children),
+            )
+            .when_some(self.suffix, |this, suffix| this.child(suffix))
+    }
+}

crates/ui/src/theme.rs

@@ -0,0 +1,537 @@
+use std::ops::{Deref, DerefMut};
+
+use gpui::{
+    hsla, point, AppContext, BoxShadow, Global, Hsla, ModelContext, Pixels, SharedString,
+    ViewContext, WindowAppearance, WindowContext,
+};
+
+pub fn init(cx: &mut AppContext) {
+    Theme::sync_system_appearance(cx)
+}
+
+pub trait ActiveTheme {
+    fn theme(&self) -> &Theme;
+}
+
+impl ActiveTheme for AppContext {
+    fn theme(&self) -> &Theme {
+        Theme::global(self)
+    }
+}
+
+impl<V> ActiveTheme for ViewContext<'_, V> {
+    fn theme(&self) -> &Theme {
+        self.deref().theme()
+    }
+}
+
+impl<V> ActiveTheme for ModelContext<'_, V> {
+    fn theme(&self) -> &Theme {
+        self.deref().theme()
+    }
+}
+
+impl ActiveTheme for WindowContext<'_> {
+    fn theme(&self) -> &Theme {
+        self.deref().theme()
+    }
+}
+
+/// Make a [gpui::Hsla] color.
+///
+/// - h: 0..360.0
+/// - s: 0.0..100.0
+/// - l: 0.0..100.0
+pub fn hsl(h: f32, s: f32, l: f32) -> Hsla {
+    hsla(h / 360., s / 100.0, l / 100.0, 1.0)
+}
+
+/// Make a BoxShadow like CSS
+///
+/// e.g:
+///
+/// If CSS is `box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.1);`
+///
+/// Then the equivalent in Rust is `box_shadow(0., 0., 10., 0., hsla(0., 0., 0., 0.1))`
+pub fn box_shadow(
+    x: impl Into<Pixels>,
+    y: impl Into<Pixels>,
+    blur: impl Into<Pixels>,
+    spread: impl Into<Pixels>,
+    color: Hsla,
+) -> BoxShadow {
+    BoxShadow {
+        offset: point(x.into(), y.into()),
+        blur_radius: blur.into(),
+        spread_radius: spread.into(),
+        color,
+    }
+}
+pub trait Colorize {
+    fn opacity(&self, opacity: f32) -> Hsla;
+    fn divide(&self, divisor: f32) -> Hsla;
+    fn invert(&self) -> Hsla;
+    fn invert_l(&self) -> Hsla;
+    fn lighten(&self, amount: f32) -> Hsla;
+    fn darken(&self, amount: f32) -> Hsla;
+    fn apply(&self, base_color: Hsla) -> Hsla;
+}
+
+impl Colorize for Hsla {
+    /// Returns a new color with the given opacity.
+    ///
+    /// The opacity is a value between 0.0 and 1.0, where 0.0 is fully transparent and 1.0 is fully opaque.
+    fn opacity(&self, factor: f32) -> Hsla {
+        Hsla {
+            a: self.a * factor.clamp(0.0, 1.0),
+            ..*self
+        }
+    }
+
+    /// Returns a new color with each channel divided by the given divisor.
+    ///
+    /// The divisor in range of 0.0 .. 1.0
+    fn divide(&self, divisor: f32) -> Hsla {
+        Hsla {
+            a: divisor,
+            ..*self
+        }
+    }
+
+    /// Return inverted color
+    fn invert(&self) -> Hsla {
+        Hsla {
+            h: (self.h + 1.8) % 3.6,
+            s: 1.0 - self.s,
+            l: 1.0 - self.l,
+            a: self.a,
+        }
+    }
+
+    /// Return inverted lightness
+    fn invert_l(&self) -> Hsla {
+        Hsla {
+            l: 1.0 - self.l,
+            ..*self
+        }
+    }
+
+    /// Return a new color with the lightness increased by the given factor.
+    fn lighten(&self, factor: f32) -> Hsla {
+        let l = self.l + (1.0 - self.l) * factor.clamp(0.0, 1.0).min(1.0);
+
+        Hsla { l, ..*self }
+    }
+
+    /// Return a new color with the darkness increased by the given factor.
+    fn darken(&self, factor: f32) -> Hsla {
+        let l = self.l * (1.0 - factor.clamp(0.0, 1.0).min(1.0));
+
+        Hsla { l, ..*self }
+    }
+
+    /// Return a new color with the same lightness and alpha but different hue and saturation.
+    fn apply(&self, new_color: Hsla) -> Hsla {
+        Hsla {
+            h: new_color.h,
+            s: new_color.s,
+            l: self.l,
+            a: self.a,
+        }
+    }
+}
+#[derive(Debug, Clone, Copy, Default)]
+pub struct ThemeColor {
+    pub accent: Hsla,
+    pub accent_foreground: Hsla,
+    pub accordion: Hsla,
+    pub accordion_active: Hsla,
+    pub accordion_hover: Hsla,
+    pub background: Hsla,
+    pub border: Hsla,
+    pub card: Hsla,
+    pub card_foreground: Hsla,
+    pub destructive: Hsla,
+    pub destructive_active: Hsla,
+    pub destructive_foreground: Hsla,
+    pub destructive_hover: Hsla,
+    pub drag_border: Hsla,
+    pub drop_target: Hsla,
+    pub foreground: Hsla,
+    pub input: Hsla,
+    pub link: Hsla,
+    pub link_active: Hsla,
+    pub link_hover: Hsla,
+    pub list: Hsla,
+    pub list_active: Hsla,
+    pub list_active_border: Hsla,
+    pub list_even: Hsla,
+    pub list_head: Hsla,
+    pub list_hover: Hsla,
+    pub muted: Hsla,
+    pub muted_foreground: Hsla,
+    pub panel: Hsla,
+    pub popover: Hsla,
+    pub popover_foreground: Hsla,
+    pub primary: Hsla,
+    pub primary_active: Hsla,
+    pub primary_foreground: Hsla,
+    pub primary_hover: Hsla,
+    pub progress_bar: Hsla,
+    pub ring: Hsla,
+    pub scrollbar: Hsla,
+    pub scrollbar_thumb: Hsla,
+    pub secondary: Hsla,
+    pub secondary_active: Hsla,
+    pub secondary_foreground: Hsla,
+    pub secondary_hover: Hsla,
+    pub selection: Hsla,
+    pub skeleton: Hsla,
+    pub slider_bar: Hsla,
+    pub slider_thumb: Hsla,
+    pub tab: Hsla,
+    pub tab_active: Hsla,
+    pub tab_active_foreground: Hsla,
+    pub tab_bar: Hsla,
+    pub tab_foreground: Hsla,
+    pub table: Hsla,
+    pub table_active: Hsla,
+    pub table_active_border: Hsla,
+    pub table_even: Hsla,
+    pub table_head: Hsla,
+    pub table_head_foreground: Hsla,
+    pub table_hover: Hsla,
+    pub table_row_border: Hsla,
+    pub title_bar: Hsla,
+    pub title_bar_border: Hsla,
+    pub sidebar: Hsla,
+    pub sidebar_accent: Hsla,
+    pub sidebar_accent_foreground: Hsla,
+    pub sidebar_border: Hsla,
+    pub sidebar_foreground: Hsla,
+    pub sidebar_primary: Hsla,
+    pub sidebar_primary_foreground: Hsla,
+}
+
+impl ThemeColor {
+    pub fn light() -> Self {
+        Self {
+            accent: hsl(240.0, 5.0, 96.0),
+            accent_foreground: hsl(240.0, 5.9, 10.0),
+            accordion: hsl(0.0, 0.0, 100.0),
+            accordion_active: hsl(240.0, 5.9, 90.0),
+            accordion_hover: hsl(240.0, 4.8, 95.9).opacity(0.7),
+            background: hsl(0.0, 0.0, 100.),
+            border: hsl(240.0, 5.9, 90.0),
+            card: hsl(0.0, 0.0, 100.0),
+            card_foreground: hsl(240.0, 10.0, 3.9),
+            destructive: hsl(0.0, 84.2, 60.2),
+            destructive_active: hsl(0.0, 84.2, 47.0),
+            destructive_foreground: hsl(0.0, 0.0, 98.0),
+            destructive_hover: hsl(0.0, 84.2, 65.0),
+            drag_border: crate::blue_500(),
+            drop_target: hsl(235.0, 30., 44.0).opacity(0.25),
+            foreground: hsl(240.0, 10., 3.9),
+            input: hsl(240.0, 5.9, 90.0),
+            link: hsl(221.0, 83.0, 53.0),
+            link_active: hsl(221.0, 83.0, 53.0).darken(0.2),
+            link_hover: hsl(221.0, 83.0, 53.0).lighten(0.2),
+            list: hsl(0.0, 0.0, 100.),
+            list_active: hsl(211.0, 97.0, 85.0).opacity(0.2),
+            list_active_border: hsl(211.0, 97.0, 85.0),
+            list_even: hsl(240.0, 5.0, 96.0),
+            list_head: hsl(0.0, 0.0, 100.),
+            list_hover: hsl(240.0, 4.8, 95.0),
+            muted: hsl(240.0, 4.8, 95.9),
+            muted_foreground: hsl(240.0, 3.8, 46.1),
+            panel: hsl(0.0, 0.0, 100.0),
+            popover: hsl(0.0, 0.0, 100.0),
+            popover_foreground: hsl(240.0, 10.0, 3.9),
+            primary: hsl(223.0, 5.9, 10.0),
+            primary_active: hsl(223.0, 1.9, 25.0),
+            primary_foreground: hsl(223.0, 0.0, 98.0),
+            primary_hover: hsl(223.0, 5.9, 15.0),
+            progress_bar: hsl(223.0, 5.9, 10.0),
+            ring: hsl(240.0, 5.9, 65.0),
+            scrollbar: hsl(0., 0., 97.).opacity(0.3),
+            scrollbar_thumb: hsl(0., 0., 69.),
+            secondary: hsl(240.0, 5.9, 96.9),
+            secondary_active: hsl(240.0, 5.9, 93.),
+            secondary_foreground: hsl(240.0, 59.0, 10.),
+            secondary_hover: hsl(240.0, 5.9, 98.),
+            selection: hsl(211.0, 97.0, 85.0),
+            skeleton: hsl(223.0, 5.9, 10.0).opacity(0.1),
+            slider_bar: hsl(223.0, 5.9, 10.0),
+            slider_thumb: hsl(0.0, 0.0, 100.0),
+            tab: gpui::transparent_black(),
+            tab_active: hsl(0.0, 0.0, 100.0),
+            tab_active_foreground: hsl(240.0, 10., 3.9),
+            tab_bar: hsl(240.0, 4.8, 95.9),
+            tab_foreground: hsl(240.0, 10., 3.9),
+            table: hsl(0.0, 0.0, 100.),
+            table_active: hsl(211.0, 97.0, 85.0).opacity(0.2),
+            table_active_border: hsl(211.0, 97.0, 85.0),
+            table_even: hsl(240.0, 5.0, 96.0),
+            table_head: hsl(0.0, 0.0, 100.),
+            table_head_foreground: hsl(240.0, 10., 3.9).opacity(0.7),
+            table_hover: hsl(240.0, 4.8, 95.0),
+            table_row_border: hsl(240.0, 7.7, 94.5),
+            title_bar: hsl(0.0, 0.0, 100.),
+            title_bar_border: hsl(240.0, 5.9, 90.0),
+            sidebar: hsl(0.0, 0.0, 98.0),
+            sidebar_accent: hsl(240.0, 4.8, 92.),
+            sidebar_accent_foreground: hsl(240.0, 5.9, 10.0),
+            sidebar_border: hsl(220.0, 13.0, 91.0),
+            sidebar_foreground: hsl(240.0, 5.3, 26.1),
+            sidebar_primary: hsl(240.0, 5.9, 10.0),
+            sidebar_primary_foreground: hsl(0.0, 0.0, 98.0),
+        }
+    }
+
+    pub fn dark() -> Self {
+        Self {
+            accent: hsl(240.0, 3.7, 15.9),
+            accent_foreground: hsl(0.0, 0.0, 78.0),
+            accordion: hsl(299.0, 2., 11.),
+            accordion_active: hsl(240.0, 3.7, 16.9),
+            accordion_hover: hsl(240.0, 3.7, 15.9).opacity(0.7),
+            background: hsl(0.0, 0.0, 8.0),
+            border: hsl(240.0, 3.7, 16.9),
+            card: hsl(0.0, 0.0, 8.0),
+            card_foreground: hsl(0.0, 0.0, 78.0),
+            destructive: hsl(0.0, 62.8, 30.6),
+            destructive_active: hsl(0.0, 62.8, 20.6),
+            destructive_foreground: hsl(0.0, 0.0, 78.0),
+            destructive_hover: hsl(0.0, 62.8, 35.6),
+            drag_border: crate::blue_500(),
+            drop_target: hsl(235.0, 30., 44.0).opacity(0.1),
+            foreground: hsl(0., 0., 78.),
+            input: hsl(240.0, 3.7, 15.9),
+            link: hsl(221.0, 83.0, 53.0),
+            link_active: hsl(221.0, 83.0, 53.0).darken(0.2),
+            link_hover: hsl(221.0, 83.0, 53.0).lighten(0.2),
+            list: hsl(0.0, 0.0, 8.0),
+            list_active: hsl(240.0, 3.7, 15.0).opacity(0.2),
+            list_active_border: hsl(240.0, 5.9, 35.5),
+            list_even: hsl(240.0, 3.7, 10.0),
+            list_head: hsl(0.0, 0.0, 8.0),
+            list_hover: hsl(240.0, 3.7, 15.9),
+            muted: hsl(240.0, 3.7, 15.9),
+            muted_foreground: hsl(240.0, 5.0, 64.9),
+            panel: hsl(299.0, 2., 11.),
+            popover: hsl(0.0, 0.0, 10.),
+            popover_foreground: hsl(0.0, 0.0, 78.0),
+            primary: hsl(223.0, 0.0, 98.0),
+            primary_active: hsl(223.0, 0.0, 80.0),
+            primary_foreground: hsl(223.0, 5.9, 10.0),
+            primary_hover: hsl(223.0, 0.0, 90.0),
+            progress_bar: hsl(223.0, 0.0, 98.0),
+            ring: hsl(240.0, 4.9, 83.9),
+            scrollbar: hsl(240., 1., 15.).opacity(0.3),
+            scrollbar_thumb: hsl(0., 0., 68.),
+            secondary: hsl(240.0, 0., 13.0),
+            secondary_active: hsl(240.0, 0., 10.),
+            secondary_foreground: hsl(0.0, 0.0, 78.0),
+            secondary_hover: hsl(240.0, 0., 15.),
+            selection: hsl(211.0, 97.0, 22.0),
+            skeleton: hsla(223.0, 0.0, 98.0, 0.1),
+            slider_bar: hsl(223.0, 0.0, 98.0),
+            slider_thumb: hsl(0.0, 0.0, 8.0),
+            tab: gpui::transparent_black(),
+            tab_active: hsl(0.0, 0.0, 8.0),
+            tab_active_foreground: hsl(0., 0., 78.),
+            tab_bar: hsl(299.0, 0., 5.5),
+            tab_foreground: hsl(0., 0., 78.),
+            table: hsl(0.0, 0.0, 8.0),
+            table_active: hsl(240.0, 3.7, 15.0).opacity(0.2),
+            table_active_border: hsl(240.0, 5.9, 35.5),
+            table_even: hsl(240.0, 3.7, 10.0),
+            table_head: hsl(0.0, 0.0, 8.0),
+            table_head_foreground: hsl(0., 0., 78.).opacity(0.7),
+            table_hover: hsl(240.0, 3.7, 15.9).opacity(0.5),
+            table_row_border: hsl(240.0, 3.7, 16.9).opacity(0.5),
+            title_bar: hsl(0., 0., 9.7),
+            title_bar_border: hsl(240.0, 3.7, 15.9),
+            sidebar: hsl(240.0, 0.0, 10.0),
+            sidebar_accent: hsl(240.0, 3.7, 15.9),
+            sidebar_accent_foreground: hsl(240.0, 4.8, 95.9),
+            sidebar_border: hsl(240.0, 3.7, 15.9),
+            sidebar_foreground: hsl(240.0, 4.8, 95.9),
+            sidebar_primary: hsl(0.0, 0.0, 98.0),
+            sidebar_primary_foreground: hsl(240.0, 5.9, 10.0),
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct Theme {
+    colors: ThemeColor,
+
+    pub mode: ThemeMode,
+    pub font_family: SharedString,
+    pub font_size: f32,
+    pub radius: f32,
+    pub shadow: bool,
+    pub transparent: Hsla,
+}
+
+impl Deref for Theme {
+    type Target = ThemeColor;
+
+    fn deref(&self) -> &Self::Target {
+        &self.colors
+    }
+}
+
+impl DerefMut for Theme {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.colors
+    }
+}
+
+impl Global for Theme {}
+
+impl Theme {
+    /// Returns the global theme reference
+    pub fn global(cx: &AppContext) -> &Theme {
+        cx.global::<Theme>()
+    }
+
+    /// Returns the global theme mutable reference
+    pub fn global_mut(cx: &mut AppContext) -> &mut Theme {
+        cx.global_mut::<Theme>()
+    }
+
+    /// Apply a mask color to the theme.
+    pub fn apply_color(&mut self, mask_color: Hsla) {
+        self.title_bar = self.title_bar.apply(mask_color);
+        self.title_bar_border = self.title_bar_border.apply(mask_color);
+        self.background = self.background.apply(mask_color);
+        self.foreground = self.foreground.apply(mask_color);
+        self.card = self.card.apply(mask_color);
+        self.card_foreground = self.card_foreground.apply(mask_color);
+        self.popover = self.popover.apply(mask_color);
+        self.popover_foreground = self.popover_foreground.apply(mask_color);
+        self.primary = self.primary.apply(mask_color);
+        self.primary_hover = self.primary_hover.apply(mask_color);
+        self.primary_active = self.primary_active.apply(mask_color);
+        self.primary_foreground = self.primary_foreground.apply(mask_color);
+        self.secondary = self.secondary.apply(mask_color);
+        self.secondary_hover = self.secondary_hover.apply(mask_color);
+        self.secondary_active = self.secondary_active.apply(mask_color);
+        self.secondary_foreground = self.secondary_foreground.apply(mask_color);
+        // self.destructive = self.destructive.apply(mask_color);
+        // self.destructive_hover = self.destructive_hover.apply(mask_color);
+        // self.destructive_active = self.destructive_active.apply(mask_color);
+        // self.destructive_foreground = self.destructive_foreground.apply(mask_color);
+        self.muted = self.muted.apply(mask_color);
+        self.muted_foreground = self.muted_foreground.apply(mask_color);
+        self.accent = self.accent.apply(mask_color);
+        self.accent_foreground = self.accent_foreground.apply(mask_color);
+        self.border = self.border.apply(mask_color);
+        self.input = self.input.apply(mask_color);
+        self.ring = self.ring.apply(mask_color);
+        // self.selection = self.selection.apply(mask_color);
+        self.scrollbar = self.scrollbar.apply(mask_color);
+        self.scrollbar_thumb = self.scrollbar_thumb.apply(mask_color);
+        self.panel = self.panel.apply(mask_color);
+        self.drag_border = self.drag_border.apply(mask_color);
+        self.drop_target = self.drop_target.apply(mask_color);
+        self.tab_bar = self.tab_bar.apply(mask_color);
+        self.tab = self.tab.apply(mask_color);
+        self.tab_active = self.tab_active.apply(mask_color);
+        self.tab_foreground = self.tab_foreground.apply(mask_color);
+        self.tab_active_foreground = self.tab_active_foreground.apply(mask_color);
+        self.progress_bar = self.progress_bar.apply(mask_color);
+        self.slider_bar = self.slider_bar.apply(mask_color);
+        self.slider_thumb = self.slider_thumb.apply(mask_color);
+        self.list = self.list.apply(mask_color);
+        self.list_even = self.list_even.apply(mask_color);
+        self.list_head = self.list_head.apply(mask_color);
+        self.list_active = self.list_active.apply(mask_color);
+        self.list_active_border = self.list_active_border.apply(mask_color);
+        self.list_hover = self.list_hover.apply(mask_color);
+        self.table = self.table.apply(mask_color);
+        self.table_even = self.table_even.apply(mask_color);
+        self.table_active = self.table_active.apply(mask_color);
+        self.table_active_border = self.table_active_border.apply(mask_color);
+        self.table_hover = self.table_hover.apply(mask_color);
+        self.table_row_border = self.table_row_border.apply(mask_color);
+        self.table_head = self.table_head.apply(mask_color);
+        self.table_head_foreground = self.table_head_foreground.apply(mask_color);
+        self.link = self.link.apply(mask_color);
+        self.link_hover = self.link_hover.apply(mask_color);
+        self.link_active = self.link_active.apply(mask_color);
+        self.skeleton = self.skeleton.apply(mask_color);
+        self.accordion = self.accordion.apply(mask_color);
+        self.accordion_hover = self.accordion_hover.apply(mask_color);
+        self.accordion_active = self.accordion_active.apply(mask_color);
+        self.title_bar = self.title_bar.apply(mask_color);
+        self.title_bar_border = self.title_bar_border.apply(mask_color);
+        self.sidebar = self.sidebar.apply(mask_color);
+        self.sidebar_accent = self.sidebar_accent.apply(mask_color);
+        self.sidebar_accent_foreground = self.sidebar_accent_foreground.apply(mask_color);
+        self.sidebar_border = self.sidebar_border.apply(mask_color);
+        self.sidebar_foreground = self.sidebar_foreground.apply(mask_color);
+        self.sidebar_primary = self.sidebar_primary.apply(mask_color);
+        self.sidebar_primary_foreground = self.sidebar_primary_foreground.apply(mask_color);
+    }
+
+    /// Sync the theme with the system appearance
+    pub fn sync_system_appearance(cx: &mut AppContext) {
+        match cx.window_appearance() {
+            WindowAppearance::Dark | WindowAppearance::VibrantDark => {
+                Self::change(ThemeMode::Dark, cx)
+            }
+            WindowAppearance::Light | WindowAppearance::VibrantLight => {
+                Self::change(ThemeMode::Light, cx)
+            }
+        }
+    }
+
+    pub fn change(mode: ThemeMode, cx: &mut AppContext) {
+        let colors = match mode {
+            ThemeMode::Light => ThemeColor::light(),
+            ThemeMode::Dark => ThemeColor::dark(),
+        };
+
+        let mut theme = Theme::from(colors);
+        theme.mode = mode;
+
+        cx.set_global(theme);
+        cx.refresh();
+    }
+}
+
+impl From<ThemeColor> for Theme {
+    fn from(colors: ThemeColor) -> Self {
+        Theme {
+            mode: ThemeMode::default(),
+            transparent: Hsla::transparent_black(),
+            font_size: 16.0,
+            font_family: if cfg!(target_os = "macos") {
+                ".SystemUIFont".into()
+            } else if cfg!(target_os = "windows") {
+                "Segoe UI".into()
+            } else {
+                "FreeMono".into()
+            },
+            radius: 4.0,
+            shadow: true,
+            colors,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, Default, PartialEq, PartialOrd, Eq)]
+pub enum ThemeMode {
+    Light,
+    #[default]
+    Dark,
+}
+
+impl ThemeMode {
+    pub fn is_dark(&self) -> bool {
+        matches!(self, Self::Dark)
+    }
+}

crates/ui/src/title_bar.rs

@@ -0,0 +1,330 @@
+use std::rc::Rc;
+
+use crate::{h_flex, theme::ActiveTheme, Icon, IconName, InteractiveElementExt as _, Sizable as _};
+use gpui::{
+    div, prelude::FluentBuilder as _, px, relative, AnyElement, ClickEvent, Div, Element, Hsla,
+    InteractiveElement as _, IntoElement, ParentElement, Pixels, RenderOnce, Stateful,
+    StatefulInteractiveElement as _, Style, Styled, WindowContext,
+};
+
+pub const TITLE_BAR_HEIGHT: Pixels = px(35.);
+#[cfg(target_os = "macos")]
+const TITLE_BAR_LEFT_PADDING: Pixels = px(80.);
+#[cfg(not(target_os = "macos"))]
+const TITLE_BAR_LEFT_PADDING: Pixels = px(12.);
+
+/// TitleBar used to customize the appearance of the title bar.
+///
+/// We can put some elements inside the title bar.
+#[derive(IntoElement)]
+pub struct TitleBar {
+    base: Stateful<Div>,
+    children: Vec<AnyElement>,
+    on_close_window: Option<Rc<Box<dyn Fn(&ClickEvent, &mut WindowContext)>>>,
+}
+
+impl TitleBar {
+    pub fn new() -> Self {
+        Self {
+            base: div().id("title-bar").pl(TITLE_BAR_LEFT_PADDING),
+            children: Vec::new(),
+            on_close_window: None,
+        }
+    }
+
+    /// Add custom for close window event, default is None, then click X button will call `cx.remove_window()`.
+    /// Linux only, this will do nothing on other platforms.
+    pub fn on_close_window(
+        mut self,
+        f: impl Fn(&ClickEvent, &mut WindowContext) + 'static,
+    ) -> Self {
+        if cfg!(target_os = "linux") {
+            self.on_close_window = Some(Rc::new(Box::new(f)));
+        }
+        self
+    }
+}
+
+// The Windows control buttons have a fixed width of 35px.
+//
+// We don't need implementation the click event for the control buttons.
+// If user clicked in the bounds, the window event will be triggered.
+#[derive(IntoElement, Clone)]
+enum ControlIcon {
+    Minimize,
+    Restore,
+    Maximize,
+    Close {
+        on_close_window: Option<Rc<Box<dyn Fn(&ClickEvent, &mut WindowContext)>>>,
+    },
+}
+
+impl ControlIcon {
+    fn minimize() -> Self {
+        Self::Minimize
+    }
+
+    fn restore() -> Self {
+        Self::Restore
+    }
+
+    fn maximize() -> Self {
+        Self::Maximize
+    }
+
+    fn close(on_close_window: Option<Rc<Box<dyn Fn(&ClickEvent, &mut WindowContext)>>>) -> Self {
+        Self::Close { on_close_window }
+    }
+
+    fn id(&self) -> &'static str {
+        match self {
+            Self::Minimize => "minimize",
+            Self::Restore => "restore",
+            Self::Maximize => "maximize",
+            Self::Close { .. } => "close",
+        }
+    }
+
+    fn icon(&self) -> IconName {
+        match self {
+            Self::Minimize => IconName::WindowMinimize,
+            Self::Restore => IconName::WindowRestore,
+            Self::Maximize => IconName::WindowMaximize,
+            Self::Close { .. } => IconName::WindowClose,
+        }
+    }
+
+    fn is_close(&self) -> bool {
+        matches!(self, Self::Close { .. })
+    }
+
+    fn fg(&self, cx: &WindowContext) -> Hsla {
+        if cx.theme().mode.is_dark() {
+            crate::white()
+        } else {
+            crate::black()
+        }
+    }
+
+    fn hover_fg(&self, cx: &WindowContext) -> Hsla {
+        if self.is_close() || cx.theme().mode.is_dark() {
+            crate::white()
+        } else {
+            crate::black()
+        }
+    }
+
+    fn hover_bg(&self, cx: &WindowContext) -> Hsla {
+        if self.is_close() {
+            if cx.theme().mode.is_dark() {
+                crate::red_800()
+            } else {
+                crate::red_600()
+            }
+        } else if cx.theme().mode.is_dark() {
+            crate::stone_700()
+        } else {
+            crate::stone_200()
+        }
+    }
+}
+
+impl RenderOnce for ControlIcon {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let fg = self.fg(cx);
+        let hover_fg = self.hover_fg(cx);
+        let hover_bg = self.hover_bg(cx);
+        let icon = self.clone();
+        let is_linux = cfg!(target_os = "linux");
+        let on_close_window = match &icon {
+            ControlIcon::Close { on_close_window } => on_close_window.clone(),
+            _ => None,
+        };
+
+        div()
+            .id(self.id())
+            .flex()
+            .cursor_pointer()
+            .w(TITLE_BAR_HEIGHT)
+            .h_full()
+            .justify_center()
+            .content_center()
+            .items_center()
+            .text_color(fg)
+            .when(is_linux, |this| {
+                this.on_click(move |_, cx| match icon {
+                    Self::Minimize => cx.minimize_window(),
+                    Self::Restore => cx.zoom_window(),
+                    Self::Maximize => cx.zoom_window(),
+                    Self::Close { .. } => {
+                        if let Some(f) = on_close_window.clone() {
+                            f(&ClickEvent::default(), cx);
+                        } else {
+                            cx.remove_window();
+                        }
+                    }
+                })
+            })
+            .hover(|style| style.bg(hover_bg).text_color(hover_fg))
+            .active(|style| style.bg(hover_bg.opacity(0.7)))
+            .child(Icon::new(self.icon()).small())
+    }
+}
+
+#[derive(IntoElement)]
+struct WindowControls {
+    on_close_window: Option<Rc<Box<dyn Fn(&ClickEvent, &mut WindowContext)>>>,
+}
+
+impl RenderOnce for WindowControls {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        if cfg!(target_os = "macos") {
+            return div().id("window-controls");
+        }
+
+        h_flex()
+            .id("window-controls")
+            .items_center()
+            .flex_shrink_0()
+            .h_full()
+            .child(
+                h_flex()
+                    .justify_center()
+                    .content_stretch()
+                    .h_full()
+                    .child(ControlIcon::minimize())
+                    .child(if cx.is_maximized() {
+                        ControlIcon::restore()
+                    } else {
+                        ControlIcon::maximize()
+                    }),
+            )
+            .child(ControlIcon::close(self.on_close_window))
+    }
+}
+
+impl Styled for TitleBar {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl ParentElement for TitleBar {
+    fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
+        self.children.extend(elements);
+    }
+}
+
+impl RenderOnce for TitleBar {
+    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+        let is_linux = cfg!(target_os = "linux");
+
+        const HEIGHT: Pixels = px(34.);
+
+        div()
+            .flex_shrink_0()
+            .child(
+                self.base
+                    .flex()
+                    .flex_row()
+                    .items_center()
+                    .justify_between()
+                    .h(HEIGHT)
+                    .border_b_1()
+                    .border_color(cx.theme().title_bar_border)
+                    .bg(cx.theme().title_bar)
+                    .when(cx.is_fullscreen(), |this| this.pl(px(12.)))
+                    .on_double_click(|_, cx| cx.zoom_window())
+                    .child(
+                        h_flex()
+                            .h_full()
+                            .justify_between()
+                            .flex_shrink_0()
+                            .flex_1()
+                            .children(self.children),
+                    )
+                    .child(WindowControls {
+                        on_close_window: self.on_close_window,
+                    }),
+            )
+            .when(is_linux, |this| {
+                this.child(
+                    div()
+                        .top_0()
+                        .left_0()
+                        .absolute()
+                        .size_full()
+                        .h_full()
+                        .child(TitleBarElement {}),
+                )
+            })
+    }
+}
+
+/// A TitleBar Element that can be move the window.
+pub struct TitleBarElement {}
+
+impl IntoElement for TitleBarElement {
+    type Element = Self;
+
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+impl Element for TitleBarElement {
+    type RequestLayoutState = ();
+
+    type PrepaintState = ();
+
+    fn id(&self) -> Option<gpui::ElementId> {
+        None
+    }
+
+    fn request_layout(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        cx: &mut WindowContext,
+    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
+        let mut style = Style::default();
+        style.flex_grow = 1.0;
+        style.flex_shrink = 1.0;
+        style.size.width = relative(1.).into();
+        style.size.height = relative(1.).into();
+
+        let id = cx.request_layout(style, []);
+        (id, ())
+    }
+
+    fn prepaint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        _: gpui::Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        _: &mut WindowContext,
+    ) -> Self::PrepaintState {
+    }
+
+    #[allow(unused_variables)]
+    fn paint(
+        &mut self,
+        _: Option<&gpui::GlobalElementId>,
+        bounds: gpui::Bounds<Pixels>,
+        _: &mut Self::RequestLayoutState,
+        _: &mut Self::PrepaintState,
+        cx: &mut WindowContext,
+    ) {
+        use gpui::{MouseButton, MouseMoveEvent, MouseUpEvent};
+        cx.on_mouse_event(move |ev: &MouseMoveEvent, _, cx: &mut WindowContext| {
+            if bounds.contains(&ev.position) && ev.pressed_button == Some(MouseButton::Left) {
+                cx.start_window_move();
+            }
+        });
+
+        cx.on_mouse_event(move |ev: &MouseUpEvent, _, cx: &mut WindowContext| {
+            if ev.button == MouseButton::Left {
+                cx.show_window_menu(ev.position);
+            }
+        });
+    }
+}

crates/ui/src/tooltip.rs

@@ -0,0 +1,38 @@
+use gpui::{
+    div, px, AnyView, IntoElement, ParentElement, Render, SharedString, Styled, ViewContext,
+    VisualContext, WindowContext,
+};
+
+use crate::theme::ActiveTheme;
+
+pub struct Tooltip {
+    text: SharedString,
+}
+
+impl Tooltip {
+    pub fn new(text: impl Into<SharedString>, cx: &mut WindowContext) -> AnyView {
+        cx.new_view(|_| Self { text: text.into() }).into()
+    }
+}
+
+impl Render for Tooltip {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        div().child(
+            // Wrap in a child, to ensure the left margin is applied to the tooltip
+            div()
+                .font_family(".SystemUIFont")
+                .m_3()
+                .bg(cx.theme().popover)
+                .text_color(cx.theme().popover_foreground)
+                .bg(cx.theme().popover)
+                .border_1()
+                .border_color(cx.theme().border)
+                .shadow_md()
+                .rounded(px(6.))
+                .py_0p5()
+                .px_2()
+                .text_sm()
+                .child(self.text.clone()),
+        )
+    }
+}