From 592cc685067c36cbba87e4db14f4ebc71d65b951 Mon Sep 17 00:00:00 2001
From: Héctor Ramón Jiménez <hector0193@gmail.com>
Date: Sun, 19 Apr 2020 21:55:23 +0200
Subject: Remove `Layer` trait and simplify `Canvas`

---
 wgpu/src/widget/canvas/state.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 wgpu/src/widget/canvas/state.rs

(limited to 'wgpu/src/widget/canvas/state.rs')

diff --git a/wgpu/src/widget/canvas/state.rs b/wgpu/src/widget/canvas/state.rs
new file mode 100644
index 00000000..8388f94d
--- /dev/null
+++ b/wgpu/src/widget/canvas/state.rs
@@ -0,0 +1,20 @@
+use crate::canvas::{Event, Geometry, Size};
+
+pub trait State {
+    fn update(&mut self, _event: Event, _bounds: Size) {}
+
+    fn draw(&self, bounds: Size) -> Vec<Geometry>;
+}
+
+impl<T> State for &mut T
+where
+    T: State,
+{
+    fn update(&mut self, event: Event, bounds: Size) {
+        T::update(self, event, bounds);
+    }
+
+    fn draw(&self, bounds: Size) -> Vec<Geometry> {
+        T::draw(self, bounds)
+    }
+}
-- 
cgit