Restore a bunch of random workspace stuff

crates/gpui2/src/app/async_context.rs

@@ -182,6 +182,10 @@ pub struct AsyncWindowContext {
 }
 
 impl AsyncWindowContext {
+    pub fn window_handle(&self) -> AnyWindowHandle {
+        self.window
+    }
+
     pub(crate) fn new(app: AsyncAppContext, window: AnyWindowHandle) -> Self {
         Self { app, window }
     }

crates/gpui2/src/geometry.rs

@@ -343,7 +343,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + PartialOrd + Add<T, Output = T> + Sub<Output = T> + Default,
+    T: Clone + Debug + PartialOrd + Add<T, Output = T> + Sub<Output = T> + Default + Half,
 {
     pub fn intersects(&self, other: &Bounds<T>) -> bool {
         let my_lower_right = self.lower_right();
@@ -362,6 +362,13 @@ where
         self.size.width = self.size.width.clone() + double_amount.clone();
         self.size.height = self.size.height.clone() + double_amount;
     }
+
+    pub fn center(&self) -> Point<T> {
+        Point {
+            x: self.origin.x.clone() + self.size.width.clone().half(),
+            y: self.origin.y.clone() + self.size.height.clone().half(),
+        }
+    }
 }
 
 impl<T: Clone + Default + Debug + PartialOrd + Add<T, Output = T> + Sub<Output = T>> Bounds<T> {
@@ -1211,6 +1218,46 @@ impl From<()> for Length {
     }
 }
 
+pub trait Half {
+    fn half(&self) -> Self;
+}
+
+impl Half for f32 {
+    fn half(&self) -> Self {
+        self / 2.
+    }
+}
+
+impl Half for DevicePixels {
+    fn half(&self) -> Self {
+        Self(self.0 / 2)
+    }
+}
+
+impl Half for ScaledPixels {
+    fn half(&self) -> Self {
+        Self(self.0 / 2.)
+    }
+}
+
+impl Half for Pixels {
+    fn half(&self) -> Self {
+        Self(self.0 / 2.)
+    }
+}
+
+impl Half for Rems {
+    fn half(&self) -> Self {
+        Self(self.0 / 2.)
+    }
+}
+
+impl Half for GlobalPixels {
+    fn half(&self) -> Self {
+        Self(self.0 / 2.)
+    }
+}
+
 pub trait IsZero {
     fn is_zero(&self) -> bool;
 }