feat: refactor to use gpui event instead of local state (#18)

Reviewed-on: #18
Co-authored-by: Ren Amamiya <reya@lume.nu>
Co-committed-by: Ren Amamiya <reya@lume.nu>

crates/theme/src/geometry.rs

@@ -0,0 +1,294 @@
+use std::fmt::{self, Debug, Display, Formatter};
+
+use gpui::{AbsoluteLength, Axis, Corner, Length, Pixels};
+use serde::{Deserialize, Serialize};
+
+/// A enum for defining the placement of the element.
+///
+/// See also: [`Side`] if you need to define the left, right side.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum Placement {
+    #[serde(rename = "top")]
+    Top,
+    #[serde(rename = "bottom")]
+    Bottom,
+    #[serde(rename = "left")]
+    Left,
+    #[serde(rename = "right")]
+    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 {
+    #[inline]
+    pub fn is_horizontal(&self) -> bool {
+        matches!(self, Placement::Left | Placement::Right)
+    }
+
+    #[inline]
+    pub fn is_vertical(&self) -> bool {
+        matches!(self, Placement::Top | Placement::Bottom)
+    }
+
+    #[inline]
+    pub fn axis(&self) -> Axis {
+        match self {
+            Placement::Top | Placement::Bottom => Axis::Vertical,
+            Placement::Left | Placement::Right => Axis::Horizontal,
+        }
+    }
+}
+
+/// The anchor position of an element.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
+pub enum Anchor {
+    #[default]
+    #[serde(rename = "top-left")]
+    TopLeft,
+    #[serde(rename = "top-center")]
+    TopCenter,
+    #[serde(rename = "top-right")]
+    TopRight,
+    #[serde(rename = "bottom-left")]
+    BottomLeft,
+    #[serde(rename = "bottom-center")]
+    BottomCenter,
+    #[serde(rename = "bottom-right")]
+    BottomRight,
+}
+
+impl Display for Anchor {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        match self {
+            Anchor::TopLeft => write!(f, "TopLeft"),
+            Anchor::TopCenter => write!(f, "TopCenter"),
+            Anchor::TopRight => write!(f, "TopRight"),
+            Anchor::BottomLeft => write!(f, "BottomLeft"),
+            Anchor::BottomCenter => write!(f, "BottomCenter"),
+            Anchor::BottomRight => write!(f, "BottomRight"),
+        }
+    }
+}
+
+impl Anchor {
+    /// Returns true if the anchor is at the top.
+    #[inline]
+    pub fn is_top(&self) -> bool {
+        matches!(self, Self::TopLeft | Self::TopCenter | Self::TopRight)
+    }
+
+    /// Returns true if the anchor is at the bottom.
+    #[inline]
+    pub fn is_bottom(&self) -> bool {
+        matches!(
+            self,
+            Self::BottomLeft | Self::BottomCenter | Self::BottomRight
+        )
+    }
+
+    /// Returns true if the anchor is at the left.
+    #[inline]
+    pub fn is_left(&self) -> bool {
+        matches!(self, Self::TopLeft | Self::BottomLeft)
+    }
+
+    /// Returns true if the anchor is at the right.
+    #[inline]
+    pub fn is_right(&self) -> bool {
+        matches!(self, Self::TopRight | Self::BottomRight)
+    }
+
+    /// Returns true if the anchor is at the center.
+    #[inline]
+    pub fn is_center(&self) -> bool {
+        matches!(self, Self::TopCenter | Self::BottomCenter)
+    }
+
+    /// Swaps the vertical position of the anchor.
+    pub fn swap_vertical(&self) -> Self {
+        match self {
+            Anchor::TopLeft => Anchor::BottomLeft,
+            Anchor::TopCenter => Anchor::BottomCenter,
+            Anchor::TopRight => Anchor::BottomRight,
+            Anchor::BottomLeft => Anchor::TopLeft,
+            Anchor::BottomCenter => Anchor::TopCenter,
+            Anchor::BottomRight => Anchor::TopRight,
+        }
+    }
+
+    /// Swaps the horizontal position of the anchor.
+    pub fn swap_horizontal(&self) -> Self {
+        match self {
+            Anchor::TopLeft => Anchor::TopRight,
+            Anchor::TopCenter => Anchor::TopCenter,
+            Anchor::TopRight => Anchor::TopLeft,
+            Anchor::BottomLeft => Anchor::BottomRight,
+            Anchor::BottomCenter => Anchor::BottomCenter,
+            Anchor::BottomRight => Anchor::BottomLeft,
+        }
+    }
+
+    pub fn other_side_corner_along(&self, axis: Axis) -> Anchor {
+        match axis {
+            Axis::Vertical => match self {
+                Self::TopLeft => Self::BottomLeft,
+                Self::TopCenter => Self::BottomCenter,
+                Self::TopRight => Self::BottomRight,
+                Self::BottomLeft => Self::TopLeft,
+                Self::BottomCenter => Self::TopCenter,
+                Self::BottomRight => Self::TopRight,
+            },
+            Axis::Horizontal => match self {
+                Self::TopLeft => Self::TopRight,
+                Self::TopCenter => Self::TopCenter,
+                Self::TopRight => Self::TopLeft,
+                Self::BottomLeft => Self::BottomRight,
+                Self::BottomCenter => Self::BottomCenter,
+                Self::BottomRight => Self::BottomLeft,
+            },
+        }
+    }
+}
+
+impl From<Corner> for Anchor {
+    fn from(corner: Corner) -> Self {
+        match corner {
+            Corner::TopLeft => Anchor::TopLeft,
+            Corner::TopRight => Anchor::TopRight,
+            Corner::BottomLeft => Anchor::BottomLeft,
+            Corner::BottomRight => Anchor::BottomRight,
+        }
+    }
+}
+
+impl From<Anchor> for Corner {
+    fn from(anchor: Anchor) -> Self {
+        match anchor {
+            Anchor::TopLeft => Corner::TopLeft,
+            Anchor::TopRight => Corner::TopRight,
+            Anchor::BottomLeft => Corner::BottomLeft,
+            Anchor::BottomRight => Corner::BottomRight,
+            Anchor::TopCenter => Corner::TopLeft,
+            Anchor::BottomCenter => Corner::BottomLeft,
+        }
+    }
+}
+
+/// A enum for defining the side of the element.
+///
+/// See also: [`Placement`] if you need to define the 4 edges.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum Side {
+    #[serde(rename = "left")]
+    Left,
+    #[serde(rename = "right")]
+    Right,
+}
+
+impl Side {
+    /// Returns true if the side is left.
+    #[inline]
+    pub fn is_left(&self) -> bool {
+        matches!(self, Self::Left)
+    }
+
+    /// Returns true if the side is right.
+    #[inline]
+    pub fn is_right(&self) -> bool {
+        matches!(self, Self::Right)
+    }
+}
+
+/// A trait to extend the [`Axis`] enum with utility methods.
+pub trait AxisExt {
+    #[allow(clippy::wrong_self_convention)]
+    fn is_horizontal(self) -> bool;
+    #[allow(clippy::wrong_self_convention)]
+    fn is_vertical(self) -> bool;
+}
+
+impl AxisExt for Axis {
+    #[inline]
+    fn is_horizontal(self) -> bool {
+        self == Axis::Horizontal
+    }
+
+    #[inline]
+    fn is_vertical(self) -> bool {
+        self == Axis::Vertical
+    }
+}
+
+/// A trait for converting [`Pixels`] to `f32` and `f64`.
+pub trait PixelsExt {
+    fn as_f32(&self) -> f32;
+    #[allow(clippy::wrong_self_convention)]
+    fn as_f64(self) -> f64;
+}
+impl PixelsExt for Pixels {
+    fn as_f32(&self) -> f32 {
+        f32::from(self)
+    }
+
+    fn as_f64(self) -> f64 {
+        f64::from(self)
+    }
+}
+
+/// A trait to extend the [`Length`] enum with utility methods.
+pub trait LengthExt {
+    /// Converts the [`Length`] to [`Pixels`] based on a given `base_size` and `rem_size`.
+    ///
+    /// If the [`Length`] is [`Length::Auto`], it returns `None`.
+    fn to_pixels(&self, base_size: AbsoluteLength, rem_size: Pixels) -> Option<Pixels>;
+}
+
+impl LengthExt for Length {
+    fn to_pixels(&self, base_size: AbsoluteLength, rem_size: Pixels) -> Option<Pixels> {
+        match self {
+            Length::Auto => None,
+            Length::Definite(len) => Some(len.to_pixels(base_size, rem_size)),
+        }
+    }
+}
+
+/// A struct for defining the edges of an element.
+///
+/// A extend version of [`gpui::Edges`] to serialize/deserialize.
+#[derive(Debug, Clone, Default, Serialize, Deserialize, Eq, PartialEq)]
+#[repr(C)]
+pub struct Edges<T: Clone + Debug + Default + PartialEq> {
+    /// The size of the top edge.
+    pub top: T,
+    /// The size of the right edge.
+    pub right: T,
+    /// The size of the bottom edge.
+    pub bottom: T,
+    /// The size of the left edge.
+    pub left: T,
+}
+
+impl<T> Edges<T>
+where
+    T: Clone + Debug + Default + PartialEq,
+{
+    /// Creates a new `Edges` instance with all edges set to the same value.
+    pub fn all(value: T) -> Self {
+        Self {
+            top: value.clone(),
+            right: value.clone(),
+            bottom: value.clone(),
+            left: value,
+        }
+    }
+}