Merge pull request #2146 from zed-industries/feedback-editor-polish

Feedback editor polish

crates/gpui/src/elements.rs

@@ -1,5 +1,6 @@
 mod align;
 mod canvas;
+mod clipped;
 mod constrained_box;
 mod container;
 mod empty;
@@ -19,12 +20,12 @@ mod text;
 mod tooltip;
 mod uniform_list;
 
-use self::expanded::Expanded;
 pub use self::{
     align::*, canvas::*, constrained_box::*, container::*, empty::*, flex::*, hook::*, image::*,
     keystroke_label::*, label::*, list::*, mouse_event_handler::*, overlay::*, resizable::*,
     stack::*, svg::*, text::*, tooltip::*, uniform_list::*,
 };
+use self::{clipped::Clipped, expanded::Expanded};
 pub use crate::presenter::ChildView;
 use crate::{
     geometry::{
@@ -135,6 +136,13 @@ pub trait Element {
         Align::new(self.boxed())
     }
 
+    fn clipped(self) -> Clipped
+    where
+        Self: 'static + Sized,
+    {
+        Clipped::new(self.boxed())
+    }
+
     fn contained(self) -> Container
     where
         Self: 'static + Sized,

crates/gpui/src/elements/clipped.rs

@@ -0,0 +1,69 @@
+use std::ops::Range;
+
+use pathfinder_geometry::{rect::RectF, vector::Vector2F};
+use serde_json::json;
+
+use crate::{
+    json, DebugContext, Element, ElementBox, LayoutContext, MeasurementContext, PaintContext,
+    SizeConstraint,
+};
+
+pub struct Clipped {
+    child: ElementBox,
+}
+
+impl Clipped {
+    pub fn new(child: ElementBox) -> Self {
+        Self { child }
+    }
+}
+
+impl Element for Clipped {
+    type LayoutState = ();
+    type PaintState = ();
+
+    fn layout(
+        &mut self,
+        constraint: SizeConstraint,
+        cx: &mut LayoutContext,
+    ) -> (Vector2F, Self::LayoutState) {
+        (self.child.layout(constraint, cx), ())
+    }
+
+    fn paint(
+        &mut self,
+        bounds: RectF,
+        visible_bounds: RectF,
+        _: &mut Self::LayoutState,
+        cx: &mut PaintContext,
+    ) -> Self::PaintState {
+        cx.scene.push_layer(Some(bounds));
+        self.child.paint(bounds.origin(), visible_bounds, cx);
+        cx.scene.pop_layer();
+    }
+
+    fn rect_for_text_range(
+        &self,
+        range_utf16: Range<usize>,
+        _: RectF,
+        _: RectF,
+        _: &Self::LayoutState,
+        _: &Self::PaintState,
+        cx: &MeasurementContext,
+    ) -> Option<RectF> {
+        self.child.rect_for_text_range(range_utf16, cx)
+    }
+
+    fn debug(
+        &self,
+        _: RectF,
+        _: &Self::LayoutState,
+        _: &Self::PaintState,
+        cx: &DebugContext,
+    ) -> json::Value {
+        json!({
+            "type": "Clipped",
+            "child": self.child.debug(cx)
+        })
+    }
+}