Redesign for the v1 stable release (#3)

Only half done. Will continue in another PR.

Reviewed-on: #3

crates/dock/src/tab/mod.rs

@@ -0,0 +1,165 @@
+use gpui::prelude::FluentBuilder;
+use gpui::{
+    div, px, AnyElement, App, Div, InteractiveElement, IntoElement, MouseButton, ParentElement,
+    RenderOnce, StatefulInteractiveElement, Styled, Window,
+};
+use theme::{ActiveTheme, TABBAR_HEIGHT};
+use ui::{Selectable, Sizable, Size};
+
+pub mod tab_bar;
+
+#[derive(IntoElement)]
+pub struct Tab {
+    ix: usize,
+    base: Div,
+    label: Option<AnyElement>,
+    prefix: Option<AnyElement>,
+    suffix: Option<AnyElement>,
+    disabled: bool,
+    selected: bool,
+    size: Size,
+}
+
+impl Tab {
+    pub fn new() -> Self {
+        Self {
+            ix: 0,
+            base: div(),
+            label: None,
+            disabled: false,
+            selected: false,
+            prefix: None,
+            suffix: None,
+            size: Size::default(),
+        }
+    }
+
+    /// Set label for the tab.
+    pub fn label(mut self, label: impl Into<AnyElement>) -> Self {
+        self.label = Some(label.into());
+        self
+    }
+
+    /// 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
+    }
+
+    /// Set disabled state to the tab
+    pub fn disabled(mut self, disabled: bool) -> Self {
+        self.disabled = disabled;
+        self
+    }
+
+    /// Set index to the tab.
+    pub fn ix(mut self, ix: usize) -> Self {
+        self.ix = ix;
+        self
+    }
+}
+
+impl Default for Tab {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Selectable for Tab {
+    fn selected(mut self, selected: bool) -> Self {
+        self.selected = selected;
+        self
+    }
+
+    fn is_selected(&self) -> bool {
+        self.selected
+    }
+}
+
+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 Sizable for Tab {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+
+impl RenderOnce for Tab {
+    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
+        let (text_color, hover_text_color, bg_color, border_color) =
+            match (self.selected, self.disabled) {
+                (true, false) => (
+                    cx.theme().tab_active_foreground,
+                    cx.theme().tab_hover_foreground,
+                    cx.theme().tab_active_background,
+                    cx.theme().border,
+                ),
+                (false, false) => (
+                    cx.theme().tab_inactive_foreground,
+                    cx.theme().tab_hover_foreground,
+                    cx.theme().ghost_element_background,
+                    cx.theme().border_transparent,
+                ),
+                (true, true) => (
+                    cx.theme().tab_inactive_foreground,
+                    cx.theme().tab_hover_foreground,
+                    cx.theme().ghost_element_background,
+                    cx.theme().border_disabled,
+                ),
+                (false, true) => (
+                    cx.theme().tab_inactive_foreground,
+                    cx.theme().tab_hover_foreground,
+                    cx.theme().ghost_element_background,
+                    cx.theme().border_disabled,
+                ),
+            };
+
+        self.base
+            .id(self.ix)
+            .h(TABBAR_HEIGHT)
+            .px_4()
+            .relative()
+            .flex()
+            .items_center()
+            .flex_shrink_0()
+            .cursor_pointer()
+            .overflow_hidden()
+            .text_xs()
+            .text_ellipsis()
+            .text_color(text_color)
+            .bg(bg_color)
+            .border_l(px(1.))
+            .border_r(px(1.))
+            .border_color(border_color)
+            .when(!self.selected && !self.disabled, |this| {
+                this.hover(|this| this.text_color(hover_text_color))
+            })
+            .when_some(self.prefix, |this, prefix| {
+                this.child(prefix).text_color(text_color)
+            })
+            .when_some(self.label, |this, label| this.child(label))
+            .when_some(self.suffix, |this, suffix| this.child(suffix))
+            .on_mouse_down(MouseButton::Left, |_ev, _window, cx| {
+                cx.stop_propagation();
+            })
+    }
+}