rewind button

src/bin/flappy/main.rs

@@ -206,6 +206,27 @@ fn init_ui(
             Text::new("Go!"),
         ],
     )).observe(start_game);
+
+    fn start_rewind(trigger: Trigger<Pointer<Pressed>>, mut next: ResMut<NextState<PlayerState>>) {
+        next.set(PlayerState::Rewind);
+    }
+
+    fn end_rewind(trigger: Trigger<Pointer<Released>>, mut next: ResMut<NextState<PlayerState>>) {
+        next.set(PlayerState::Alive);
+    }
+
+    commands.spawn((
+        Node {
+            align_self: AlignSelf::End,
+            justify_self: JustifySelf::Center,
+            flex_direction: FlexDirection::Column,
+            ..default()
+        },
+        Button,
+        children![
+            Text::new("Rewind!"),
+        ],
+    )).observe(start_rewind).observe(end_rewind);
 }
 
 /// Pause the game when the player presses "Escape"