widget view

core/src/widget/view.rs

@@ -0,0 +1,16 @@
+use std::marker::Unsize;
+
+use crate::{Widget, WidgetRef};
+
+pub trait WidgetView {
+    type Widget: Widget + ?Sized + Unsize<dyn Widget>;
+    fn root(&self) -> WidgetRef<Self::Widget>;
+}
+
+pub trait HasWidget {
+    type Widget: Widget + ?Sized + Unsize<dyn Widget>;
+}
+
+impl<W: Widget + Unsize<dyn Widget>> HasWidget for WidgetRef<W> {
+    type Widget = W;
+}