prototypes/life: ui buttons: play, pause, step, quit

prototypes/src/bin/life.rs

@@ -1,5 +1,6 @@
 // TODO: Rearchitected so it's Cell and Coordiantes not Cell { position { coordiantes } }
 
+use bevy::picking::hover::Hovered;
 use engine::*;
 
 const GREY_TILE: &str = "tileGrey_01.png";
@@ -25,6 +26,7 @@ fn main() {
         .init_resource::<Coordinates>()
         .init_state::<SimulationState>()
         .add_message::<Lifecycle>()
+        .add_message::<SimulationState>()
         .add_systems(Startup, setup)
         .add_systems(
             Update,
@@ -43,6 +45,14 @@ fn main() {
             Update,
             simulation_step.run_if(input_just_pressed(KeyCode::Space)),
         )
+        .add_systems(
+            Update,
+            simulation_step.run_if(in_state(SimulationState::Run)).run_if(cooldown_secs(1.0)),
+        )
+        .add_systems(
+            Update,
+            simulation_step.run_if(on_message::<SimulationState>),
+        )
         .add_systems(Update, cell_lifecycle.run_if(on_message::<Lifecycle>))
         .add_observer(on_add_ui_button)
         .add_observer(on_add_coordinates)
@@ -86,6 +96,7 @@ fn on_add_ui_button(
         .entity(trigger.entity)
         .insert((
             Button,
+            Hovered::default(),
             BackgroundColor(GRAY.into()),
             ImageNode {
                 image: server.load(GREY_TILE),
@@ -130,14 +141,33 @@ fn setup(mut commands: Commands) {
             Transform::default(),
         ))
         .with_children(|parent| {
-            parent.spawn(UiButton::Power);
-            parent.spawn(UiButton::Pause);
-            parent.spawn(UiButton::Step);
-            parent.spawn(UiButton::Play);
-            parent.spawn(UiButton::ZoomOut);
-            parent.spawn(UiButton::ZoomIn);
+            parent.spawn(UiButton::Power).observe(shutdown);
+            parent.spawn(UiButton::Pause).observe(pause_sim);
+            parent.spawn(UiButton::Step).observe(step_sim);
+            parent.spawn(UiButton::Play).observe(play_sim);
+            parent.spawn(UiButton::ZoomOut).observe(zoom_out);
+            parent.spawn(UiButton::ZoomIn).observe(zoom_in);
         });
 
+    fn shutdown(_trigger: On<Pointer<Press>>, mut writer: MessageWriter<AppExit>) {
+        writer.write(AppExit::Success);
+    }
+    fn pause_sim(_trigger: On<Pointer<Press>>, mut next: ResMut<NextState<SimulationState>>) {
+        next.set(SimulationState::Pause);
+    }
+    fn step_sim(_trigger: On<Pointer<Press>>, mut writer: MessageWriter<SimulationState>) {
+        writer.write(SimulationState::Step);
+    }
+    fn play_sim(_trigger: On<Pointer<Press>>, mut next: ResMut<NextState<SimulationState>>) {
+        next.set(SimulationState::Run);
+    }
+    fn zoom_out(trigger: On<Pointer<Press>>) {
+        todo!()
+    }
+    fn zoom_in(trigger: On<Pointer<Press>>) {
+        todo!()
+    }
+
     // Spawn Coordiantes
     commands
         .spawn((Transform::default(), Visibility::Visible))
@@ -268,17 +298,20 @@ struct Cell;
 
 // When left mouse clicked, spawn a cell at GridPosition
 fn de_spawn_cells(
-    mut commands: Commands,
     coordinates: Res<Coordinates>,
     cells: Query<(Entity, &Coordinates), With<Cell>>,
+    mut lifecycle: MessageWriter<Lifecycle>,
+    hovered: Query<&Hovered>,
 ) {
-    if let Some(e) = cells
-        .iter()
-        .find_map(|(e, c)| (*coordinates == *c).then_some(e))
-    {
-        commands.entity(e).despawn();
-    } else {
-        commands.spawn((coordinates.clone(), Cell));
+    if hovered.iter().all(|Hovered(h)| !h) {
+        if let Some(e) = cells
+            .iter()
+            .find_map(|(e, c)| (*coordinates == *c).then_some(e))
+        {
+            lifecycle.write(Lifecycle::Dead(e));
+        } else {
+            lifecycle.write(Lifecycle::Alive(coordinates.clone()));
+        }
     }
 }
 
@@ -292,12 +325,12 @@ fn assert_cell_uniqueness(q: Query<(Entity, &Coordinates), With<Cell>>) {
     })
 }
 
-#[derive(States, Debug, Default, Hash, PartialEq, Eq, Clone)]
+#[derive(States, Debug, Default, Hash, PartialEq, Eq, Clone, Message)]
 enum SimulationState {
     #[default]
-    Off,
-    Step,
+    Pause,
     Run,
+    Step,
 }
 
 /// Simulate the Game of Life Rules:
@@ -407,8 +440,21 @@ fn cell_lifecycle(
             commands.spawn((c.clone(), Cell));
         }
         Lifecycle::Dead(e) => {
-            // TODO: Maybe include the entity instead of the coordinates for Dead
             commands.entity(*e).despawn();
         }
     })
 }
+
+// Run condition for running a system every `input` seconds
+fn cooldown_secs(input: f32) -> impl FnMut(Local<Timer>, Res<Time>) -> bool + Clone
+{
+    move |mut timer: Local<Timer>, time: Res<Time>| {
+        if *timer == Timer::default() {
+            *timer = Timer::from_seconds(input, TimerMode::Repeating);
+        } else {
+            timer.tick(time.delta());
+        }
+        timer.is_finished()
+
+    }
+}