feat(sceen): add pause screen

src/screens/gameplay.rs

@@ -21,11 +21,10 @@ pub(super) fn plugin(app: &mut App) {
 
     app.add_systems(
         Update,
-        return_to_title_screen
+        pause_game.run_if(in_state(Screen::Gameplay).and(input_just_pressed(KeyCode::Escape))),
-            .run_if(in_state(Screen::Gameplay).and(input_just_pressed(KeyCode::Escape))),
     );
 }
 
-fn return_to_title_screen(mut next_screen: ResMut<NextState<Screen>>) {
+fn pause_game(mut next_screen: ResMut<NextState<Screen>>) {
-    next_screen.set(Screen::Title);
+    next_screen.set(Screen::Pause);
 }

src/screens/mod.rs

@@ -2,6 +2,7 @@
 
 mod gameplay;
 mod loading;
+mod pause;
 mod splash;
 mod title;
 
@@ -16,6 +17,7 @@ pub(super) fn plugin(app: &mut App) {
         loading::plugin,
         splash::plugin,
         title::plugin,
+        pause::plugin,
     ));
 }
 
@@ -28,4 +30,5 @@ pub enum Screen {
     Loading,
     Title,
     Gameplay,
+    Pause,
 }

src/screens/pause.rs

@@ -0,0 +1,43 @@
+use bevy::{input::common_conditions::input_just_pressed, prelude::*};
+
+use crate::theme::{
+    events::OnPress,
+    widgets::{Containers, Widgets},
+};
+
+use super::Screen;
+
+pub(super) fn plugin(app: &mut App) {
+    app.add_systems(OnEnter(Screen::Pause), spawn_title_screen);
+    app.add_systems(
+        Update,
+        return_to_game.run_if(in_state(Screen::Pause).and(input_just_pressed(KeyCode::Escape))),
+    );
+}
+
+fn spawn_title_screen(mut commands: Commands) {
+    commands
+        .ui_root()
+        .insert(StateScoped(Screen::Pause))
+        .with_children(|parent| {
+            parent.button("Continue").observe(return_to_game_trigger);
+            parent
+                .button("Exit")
+                .observe(return_to_title_screen_trigger);
+        });
+}
+
+fn return_to_game_trigger(_trigger: Trigger<OnPress>, mut next_screen: ResMut<NextState<Screen>>) {
+    next_screen.set(Screen::Gameplay);
+}
+
+fn return_to_title_screen_trigger(
+    _trigger: Trigger<OnPress>,
+    mut next_screen: ResMut<NextState<Screen>>,
+) {
+    next_screen.set(Screen::Title);
+}
+
+fn return_to_game(mut next_screen: ResMut<NextState<Screen>>) {
+    next_screen.set(Screen::Gameplay);
+}