Draft `Canvas` types and `clock` example

1 files changed, 20 insertions, 0 deletions

diff --git a/wgpu/src/widget/canvas/data.rs b/wgpu/src/widget/canvas/data.rs
new file mode 100644
index 00000000..25d94f4c
--- /dev/null
+++ b/wgpu/src/widget/canvas/data.rs
@@ -0,0 +1,20 @@
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
+pub struct Data<T> {
+    raw: T,
+    version: usize,
+}
+
+impl<T> Data<T> {
+    pub fn new(data: T) -> Self {
+        Data {
+            raw: data,
+            version: 0,
+        }
+    }
+
+    pub fn update(&mut self, f: impl FnOnce(&mut T)) {
+        f(&mut self.raw);
+
+        self.version += 1;
+    }
+}