chore: simplified layer shell example

- The layer shell example now opens only one window instead of opening
multiple windows.

examples/simple_layer_shell_window.rs

@@ -28,12 +28,8 @@ fn main() {
                 }),
             WaylandPlugin,
         ))
-        .init_resource::<NewWindowInfo>()
         .add_systems(Startup, setup)
-        .add_systems(
-            Update,
-            (button_system, spawn_window, setup_new_window, exit_on_esc),
-        )
+        .add_systems(Update, (button_system, exit_on_esc))
         .run();
 }
 
@@ -72,18 +68,13 @@ fn button_system(
     }
 }
 
-#[derive(Component, Deref, DerefMut)]
-struct WindowTimer(Timer);
 fn setup(mut commands: Commands, assets: Res<AssetServer>, windows: Query<Entity, With<Window>>) {
     for entity in &windows {
-        commands.entity(entity).insert((
-            LayerShellSettings {
-                anchor: Anchor::TOP | Anchor::LEFT,
-                layer: Layer::Bottom,
-                ..Default::default()
-            },
-            InputRegion(Rect::new(0., 0., 200., 200.)),
-        ));
+        commands.entity(entity).insert((LayerShellSettings {
+            anchor: Anchor::TOP | Anchor::LEFT,
+            layer: Layer::Bottom,
+            ..Default::default()
+        },));
     }
     // ui camera
     commands.spawn(Camera2d);
@@ -96,69 +87,6 @@ fn exit_on_esc(keys: Res<ButtonInput<KeyCode>>) {
     }
 }
 
-fn spawn_window(
-    mut commands: Commands,
-    mut windows: Query<(Entity, &mut WindowTimer)>,
-    mut new_window_info: ResMut<NewWindowInfo>,
-    keys: Res<ButtonInput<KeyCode>>,
-    time: Res<Time>,
-) {
-    if keys.pressed(KeyCode::KeyN) {
-        println!("Pressed");
-        let new_window_entity = commands
-            .spawn((
-                Window {
-                    title: "UI Only Window".to_string(),
-                    resolution: (400., 50.).into(),
-                    ..default()
-                },
-                LayerShellSettings {
-                    layer: Layer::Top,
-                    anchor: Anchor::TOP | Anchor::LEFT,
-                    ..default()
-                },
-                WindowTimer(Timer::new(Duration::from_secs(5), TimerMode::Once)),
-            ))
-            .id();
-
-        new_window_info.entity = Some(new_window_entity);
-        new_window_info.is_setup_pending = true;
-    }
-}
-
-#[derive(Resource, Default)]
-struct NewWindowInfo {
-    entity: Option<Entity>,
-    is_setup_pending: bool,
-}
-fn setup_new_window(
-    mut commands: Commands,
-    mut window_created_events: EventReader<WindowCreated>,
-    mut new_window_info: ResMut<NewWindowInfo>,
-    asset_server: Res<AssetServer>, // For fonts
-) {
-    for event in window_created_events.read() {
-        if Some(event.window) == new_window_info.entity && new_window_info.is_setup_pending {
-            info!(
-                "New UI window created (ID: {:?}), setting up its camera and UI.",
-                event.window
-            );
-
-            commands.spawn((
-                Camera {
-                    target: bevy::render::camera::RenderTarget::Window(
-                        bevy::window::WindowRef::Entity(event.window),
-                    ),
-                    clear_color: ClearColorConfig::Custom(Color::default()),
-                    ..default()
-                },
-                Camera2d,
-            ));
-            new_window_info.is_setup_pending = false; // Mark as setup complete
-        }
-    }
-}
-
 fn button(asset_server: &AssetServer) -> impl Bundle + use<> {
     (
         Node {