Add scoped overlay hosts

src/android/view.rs

@@ -109,9 +109,9 @@ impl AndroidUiState {
     }
 }
 
-impl HasRoot for AndroidUiState {
-    fn set_root(&mut self, root: StrongWidget) {
-        self.root = Some(root);
+impl<State: 'static> HasRoot<AndroidRsc<State>> for AndroidUiState {
+    fn set_root(&mut self, rsc: &mut AndroidRsc<State>, root: StrongWidget) {
+        self.root = Some(crate::overlay::default_overlay_root(rsc, root));
     }
 }
 
@@ -463,12 +463,19 @@ impl<State: AndroidAppState> ViewPeer for IrisViewPeer<State> {
         // `android/insets.rs`'s doc comment for why insets could not take
         // the same shortcut.
         if key_code == Keycode::Back {
+            if self.rsc.run_command(Command::Escape) != CommandResult::Unused {
+                self.after_input(ctx);
+                return true;
+            }
             let handled = self.state.back_pressed(&mut self.rsc, &mut self.render);
             if handled {
                 self.after_input(ctx);
             }
             return handled;
         }
+        if self.rsc.events.controllers.command_target_blocks_input() {
+            return true;
+        }
         let handled = super::input::on_key(
             &mut self.rsc,
             &mut self.state,