use gamestates and assetloader

src/backpack/backpack_ui.rs

@@ -1,5 +1,5 @@
 use super::{BackbackSwapEvent, Backpack, BackpackHead};
-use crate::heads_ui::HeadsImages;
+use crate::{GameState, heads_ui::HeadsImages, loading_assets::UIAssets};
 use bevy::prelude::*;
 
 static HEAD_SLOTS: usize = 5;
@@ -44,20 +44,17 @@ impl BackpackUiState {
 
 pub fn plugin(app: &mut App) {
     app.init_resource::<BackpackUiState>();
-    app.add_systems(Startup, setup);
+    app.add_systems(OnEnter(GameState::Playing), setup);
     app.add_systems(
         Update,
-        (update, sync_on_change, update_visibility, update_count),
+        (update, sync_on_change, update_visibility, update_count)
+            .run_if(in_state(GameState::Playing)),
     );
+
     app.add_observer(swap_head_inputs);
 }
 
-fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
-    let bg = asset_server.load("ui/head_bg.png");
-    let regular = asset_server.load("ui/head_regular.png");
-    let damage = asset_server.load("ui/head_damage.png");
-    let selector = asset_server.load("ui/selector.png");
-
+fn setup(mut commands: Commands, assets: Res<UIAssets>) {
     commands
         .spawn((
             Name::new("backpack"),
@@ -75,10 +72,10 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
             for i in 0..HEAD_SLOTS {
                 spawn_head_ui(
                     parent,
-                    bg.clone(),
-                    regular.clone(),
-                    selector.clone(),
-                    damage.clone(),
+                    assets.head_bg.clone(),
+                    assets.head_regular.clone(),
+                    assets.head_selector.clone(),
+                    assets.head_damage.clone(),
                     i,
                 );
             }
@@ -88,7 +85,7 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
         Text::new("0"),
         BackpackCountText,
         TextFont {
-            font: asset_server.load("font.ttf"),
+            font: assets.font.clone(),
             font_size: 34.0,
             ..default()
         },