add basic MVVM setup

core/src/main/java/io/github/com/quillraven/audio/AudioService.java

@@ -2,6 +2,7 @@ package io.github.com.quillraven.audio;
 
 import com.badlogic.gdx.audio.Music;
 import com.badlogic.gdx.maps.tiled.TiledMap;
+import com.badlogic.gdx.math.MathUtils;
 import io.github.com.quillraven.asset.AssetService;
 import io.github.com.quillraven.asset.MusicAsset;
 
@@ -10,11 +11,34 @@ public class AudioService {
     private final AssetService assetService;
     private Music currentMusic;
     private MusicAsset currentMusicAsset;
+    private float musicVolume;
+    private float soundVolume;
 
     public AudioService(AssetService assetService) {
         this.assetService = assetService;
         this.currentMusic = null;
         this.currentMusicAsset = null;
+        this.musicVolume = 0.5f;
+        this.soundVolume = 0.33f;
+    }
+
+    public void setMusicVolume(float volume) {
+        this.musicVolume = MathUtils.clamp(volume, 0f, 1f);
+        if (this.currentMusic != null) {
+            this.currentMusic.setVolume(volume);
+        }
+    }
+
+    public float getMusicVolume() {
+        return musicVolume;
+    }
+
+    public void setSoundVolume(float soundVolume) {
+        this.soundVolume = MathUtils.clamp(soundVolume, 0f, 1f);
+    }
+
+    public float getSoundVolume() {
+        return soundVolume;
     }
 
     public void playMusic(MusicAsset musicAsset) {

core/src/main/java/io/github/com/quillraven/screen/GameScreen.java

@@ -47,7 +47,7 @@ public class GameScreen extends ScreenAdapter {
         this.physicWorld = new World(Vector2.Zero, true);
         this.physicWorld.setAutoClearForces(false);
         this.engine = new Engine();
-        this.tiledAshleySpawner = new TiledAshleySpawner(this.engine, this.physicWorld);
+        this.tiledAshleySpawner = new TiledAshleySpawner(this.engine, this.physicWorld, this.game.getAssetService());
         ImmutableArray<Entity> controllerEntities = this.engine.getEntitiesFor(Family.all(Controller.class).get());
         this.keyboardController = new KeyboardController(GameControllerState.class, controllerEntities);
 

core/src/main/java/io/github/com/quillraven/screen/MenuScreen.java

@@ -1,22 +1,15 @@
 package io.github.com.quillraven.screen;
 
-import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.InputMultiplexer;
 import com.badlogic.gdx.ScreenAdapter;
-import com.badlogic.gdx.scenes.scene2d.InputEvent;
 import com.badlogic.gdx.scenes.scene2d.Stage;
-import com.badlogic.gdx.scenes.scene2d.ui.Image;
-import com.badlogic.gdx.scenes.scene2d.ui.Label;
-import com.badlogic.gdx.scenes.scene2d.ui.ProgressBar;
 import com.badlogic.gdx.scenes.scene2d.ui.Skin;
-import com.badlogic.gdx.scenes.scene2d.ui.Table;
-import com.badlogic.gdx.scenes.scene2d.ui.TextButton;
-import com.badlogic.gdx.scenes.scene2d.utils.ClickListener;
-import com.badlogic.gdx.utils.Align;
 import com.badlogic.gdx.utils.viewport.FitViewport;
 import com.badlogic.gdx.utils.viewport.Viewport;
 import io.github.com.quillraven.GdxGame;
 import io.github.com.quillraven.asset.SkinAsset;
+import io.github.com.quillraven.ui.model.MenuViewModel;
+import io.github.com.quillraven.ui.view.MenuView;
 
 public class MenuScreen extends ScreenAdapter {
 
@@ -44,7 +37,7 @@ public class MenuScreen extends ScreenAdapter {
         this.inputMultiplexer.clear();
         this.inputMultiplexer.addProcessor(stage);
 
-        menuUI();
+        this.stage.addActor(new MenuView(stage, skin, new MenuViewModel(game)));
     }
 
     @Override
@@ -52,72 +45,6 @@ public class MenuScreen extends ScreenAdapter {
         this.stage.clear();
     }
 
-    private void menuUI() {
-        Table table = new Table();
-        table.setFillParent(true);
-
-        Image image = new Image(skin, "banner");
-        table.add(image);
-
-        table.row();
-        Table table1 = new Table();
-        table1.setBackground(skin.getDrawable("frame"));
-        table1.padLeft(40.0f);
-        table1.padRight(40.0f);
-        table1.padTop(25.0f);
-        table1.padBottom(20.0f);
-
-        TextButton textButton = new TextButton("Start Game", skin);
-        textButton.addListener(new ClickListener() {
-            @Override
-            public void clicked(InputEvent event, float x, float y) {
-                game.setScreen(GameScreen.class);
-            }
-        });
-        table1.add(textButton);
-
-        table1.row();
-        Table table2 = new Table();
-
-        Label label = new Label("Music Volume", skin);
-        label.setColor(skin.getColor("sand"));
-        table2.add(label);
-
-        table2.row();
-        ProgressBar progressBar = new ProgressBar(0.0f, 100.0f, 1.0f, false, skin);
-        table2.add(progressBar);
-        table1.add(table2).padTop(10.0f);
-
-        table1.row();
-        table2 = new Table();
-
-        label = new Label("Sound Volume", skin);
-        label.setColor(skin.getColor("sand"));
-        table2.add(label);
-
-        table2.row();
-        progressBar = new ProgressBar(0.0f, 100.0f, 1.0f, false, skin);
-        table2.add(progressBar);
-        table1.add(table2).padTop(10.0f);
-
-        table1.row();
-        textButton = new TextButton("Quit Game", skin);
-        textButton.addListener(new ClickListener() {
-            @Override
-            public void clicked(InputEvent event, float x, float y) {
-                Gdx.app.exit();
-            }
-        });
-        table1.add(textButton).padTop(10.0f);
-        table.add(table1).align(Align.top).expandY().padTop(20f);
-
-        table.row();
-        label = new Label("by Quillraven 2025", skin, "small");
-        label.setColor(skin.getColor("white"));
-        table.add(label).padRight(5.0f).padBottom(5f).expand().align(Align.bottomRight);
-        stage.addActor(table);
-    }
-
     @Override
     public void render(float delta) {
         stage.act(delta);

core/src/main/java/io/github/com/quillraven/ui/model/MenuViewModel.java

@@ -0,0 +1,38 @@
+package io.github.com.quillraven.ui.model;
+
+import com.badlogic.gdx.Gdx;
+import io.github.com.quillraven.GdxGame;
+import io.github.com.quillraven.audio.AudioService;
+import io.github.com.quillraven.screen.GameScreen;
+
+public class MenuViewModel extends ViewModel {
+    public static final String MUSIC_VOLUME_PROPERTY = "musicVolume";
+
+    private final AudioService audioService;
+
+    public MenuViewModel(GdxGame game) {
+        super(game);
+        this.audioService = game.getAudioService();
+    }
+
+    public float getMusicVolume() {
+        return audioService.getMusicVolume();
+    }
+
+    public void setMusicVolume(float volume) {
+        this.propertyChangeSupport.firePropertyChange(MUSIC_VOLUME_PROPERTY, getMusicVolume(), volume);
+        this.audioService.setMusicVolume(volume);
+    }
+
+    public float getSoundVolume() {
+        return audioService.getSoundVolume();
+    }
+
+    public void startGame() {
+        game.setScreen(GameScreen.class);
+    }
+
+    public void quitGame() {
+        Gdx.app.exit();
+    }
+}

core/src/main/java/io/github/com/quillraven/ui/model/ViewModel.java

@@ -0,0 +1,20 @@
+package io.github.com.quillraven.ui.model;
+
+import io.github.com.quillraven.GdxGame;
+
+import java.beans.PropertyChangeListener;
+import java.beans.PropertyChangeSupport;
+
+public abstract class ViewModel {
+    protected final GdxGame game;
+    protected final PropertyChangeSupport propertyChangeSupport;
+
+    public ViewModel(GdxGame game) {
+        this.game = game;
+        this.propertyChangeSupport = new PropertyChangeSupport(this);
+    }
+
+    public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
+        this.propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
+    }
+}

core/src/main/java/io/github/com/quillraven/ui/view/MenuView.java

@@ -0,0 +1,70 @@
+package io.github.com.quillraven.ui.view;
+
+import com.badlogic.gdx.scenes.scene2d.Stage;
+import com.badlogic.gdx.scenes.scene2d.ui.Image;
+import com.badlogic.gdx.scenes.scene2d.ui.Label;
+import com.badlogic.gdx.scenes.scene2d.ui.ProgressBar;
+import com.badlogic.gdx.scenes.scene2d.ui.Skin;
+import com.badlogic.gdx.scenes.scene2d.ui.Table;
+import com.badlogic.gdx.scenes.scene2d.ui.TextButton;
+import com.badlogic.gdx.utils.Align;
+import io.github.com.quillraven.ui.model.MenuViewModel;
+
+public class MenuView extends View<MenuViewModel> {
+
+    public MenuView(Stage stage, Skin skin, MenuViewModel viewModel) {
+        super(stage, skin, viewModel);
+    }
+
+    @Override
+    protected void setupUI() {
+        setFillParent(true);
+
+        Image image = new Image(skin, "banner");
+        add(image).row();
+
+        setupMenuContent();
+
+        Label label = new Label("by Quillraven 2025", skin, "small");
+        label.setColor(skin.getColor("white"));
+        add(label).padRight(5.0f).padBottom(5f).expand().align(Align.bottomRight);
+    }
+
+    private void setupMenuContent() {
+        Table contentTable = new Table();
+        contentTable.setBackground(skin.getDrawable("frame"));
+        contentTable.padLeft(40.0f);
+        contentTable.padRight(40.0f);
+        contentTable.padTop(25.0f);
+        contentTable.padBottom(20.0f);
+
+        TextButton textButton = new TextButton("Start Game", skin);
+        onClick(textButton, ((event, x, y) -> viewModel.startGame()));
+        contentTable.add(textButton).row();
+
+        ProgressBar musicBar = setupVolumeBar(contentTable, "Music Volume", viewModel.getMusicVolume());
+        viewModel.addPropertyChangeListener(MenuViewModel.MUSIC_VOLUME_PROPERTY, (event) ->
+            musicBar.setValue((Float) event.getNewValue())
+        );
+        setupVolumeBar(contentTable, "Sound Volume", viewModel.getSoundVolume());
+
+        textButton = new TextButton("Quit Game", skin);
+        onClick(textButton, ((event, x, y) -> viewModel.quitGame()));
+        contentTable.add(textButton).padTop(10.0f);
+
+        add(contentTable).align(Align.top).expandY().padTop(20f).row();
+    }
+
+    private ProgressBar setupVolumeBar(Table contentTable, String title, float initialValue) {
+        Table table = new Table();
+        Label label = new Label(title, skin);
+        label.setColor(skin.getColor("sand"));
+        table.add(label).row();
+
+        ProgressBar progressBar = new ProgressBar(0.0f, 1f, 0.05f, false, skin);
+        progressBar.setValue(initialValue);
+        table.add(progressBar).fill();
+        contentTable.add(table).padTop(10.0f).row();
+        return progressBar;
+    }
+}

core/src/main/java/io/github/com/quillraven/ui/view/View.java

@@ -0,0 +1,40 @@
+package io.github.com.quillraven.ui.view;
+
+import com.badlogic.gdx.scenes.scene2d.Actor;
+import com.badlogic.gdx.scenes.scene2d.InputEvent;
+import com.badlogic.gdx.scenes.scene2d.Stage;
+import com.badlogic.gdx.scenes.scene2d.ui.Skin;
+import com.badlogic.gdx.scenes.scene2d.ui.Table;
+import com.badlogic.gdx.scenes.scene2d.utils.ClickListener;
+import io.github.com.quillraven.ui.model.ViewModel;
+
+public abstract class View<T extends ViewModel> extends Table {
+
+    protected final Stage stage;
+    protected final Skin skin;
+    protected final T viewModel;
+
+    public View(Stage stage, Skin skin, T viewModel) {
+        super(skin);
+        this.stage = stage;
+        this.skin = skin;
+        this.viewModel = viewModel;
+        setupUI();
+    }
+
+    protected abstract void setupUI();
+
+    public static void onClick(Actor actor, OnClickConsumer consumer) {
+        actor.addListener(new ClickListener() {
+            @Override
+            public void clicked(InputEvent event, float x, float y) {
+                consumer.onClick(event, x, y);
+            }
+        });
+    }
+
+    @FunctionalInterface
+    public interface OnClickConsumer {
+        void onClick(InputEvent event, float x, float y);
+    }
+}