LibGDX：如何从主游戏屏幕重复显示/隐藏覆盖弹出菜单
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【中文标题】LibGDX：如何从主游戏屏幕重复显示/隐藏覆盖弹出菜单【英文标题】：LibGDX: How to show/hide an overlay popup menu from the main game screen repetitively 【发布时间】：2020-05-02 07:30:52 【问题描述】：我正在做一个名为 Fuego Peligro 的游戏（基于 nfantone 的另一个名为 Ninja Rabbit 的 LibGDX“教程”项目，https://github.com/nfantone/ninja-rabbit）作为我大学 BIT 课程的论文，我想要一个叠加菜单以某种方式显示/隐藏在主游戏屏幕上。
弹出菜单就像一个检查点，显示来自主要平台游戏的简单琐事型小游戏。它通过 Telegraph (handleMessage) 方法调用。唯一的问题是当消息重复时，如果弹出窗口之前已经显示过，它不想再次重新显示。
所有文件和其他详细信息都在此链接中：https://github.com/NinjaSiren/FuegoPeligro
所有 .java 文件都在这里：https://github.com/NinjaSiren/FuegoPeligro/tree/master/core/src/com/mygdx/fuegopeligro
这是调用所有游戏内叠加层进行渲染的java类：LevelGraphicsProcessor.java
public class LevelGraphicsProcessor implements GraphicsProcessor, Telegraph
private final LevelRenderer mapRenderer;
private final GameOverOverlay gameOver;
private final LevelEndOverlay levelEnd;
private MultipleChoice multipleChoice;
private FourPicsOneWord fourPicsOneWord;
private LetterPuzzle letterPuzzle;
private Wordscapes wordscapes;
private boolean renderGameOver;
private boolean renderLevelEnd;
private boolean minicamSelection;
private final CurrentPlayerStatus status;
private final NinjaRabbit ninja;
private final Entity entity;
public LevelGraphicsProcessor(final AssetManager assets, final LevelRenderer mapRenderer,
final FuegoPeligro game, final NinjaRabbit ninjaRabbit,
final CurrentPlayerStatus player)
status = player;
ninja = ninjaRabbit;
if (ninjaRabbit == null)
throw new IllegalArgumentException("'character' cannot be null");
this.entity = ninjaRabbit;
gameOver = new GameOverOverlay(game.getBatch(), assets, game);
levelEnd = new LevelEndOverlay(game.getBatch(), assets, game);
multipleChoice = new MultipleChoice(assets, game, ninjaRabbit);
fourPicsOneWord = new FourPicsOneWord(assets, game, ninjaRabbit);
letterPuzzle = new LetterPuzzle(assets, game, ninjaRabbit);
wordscapes = new Wordscapes(assets, game, ninjaRabbit);
this.mapRenderer = mapRenderer;
MessageManager.getInstance().addListeners(this, MessageType.GAME_OVER.code());
MessageManager.getInstance().addListeners(this, MessageType.FINISH_LEVEL.code());
MessageManager.getInstance().addListeners(this, MessageType.COLLECTED.code());
@Override
public void update(final Entity character, final Camera camera)
mapRenderer.render((OrthographicCamera) camera);
/*
* (non-Javadoc)
*
* @see com.mygdx.fuegopeligro.graphics.GraphicsProcessor#draw(com.mygdx.fuegopeligro.entity.Entity,
* com.badlogic.gdx.graphics.g2d.Batch)
*/
@Override
public void draw(final Entity entity, final Batch batch)
mapRenderer.update();
if (renderGameOver)
gameOver.render(Gdx.graphics.getDeltaTime());
else if (renderLevelEnd)
levelEnd.render(Gdx.graphics.getDeltaTime());
else if (minicamSelection)
multipleChoice.render(Gdx.graphics.getDeltaTime());
wordscapes.render(Gdx.graphics.getDeltaTime());
letterPuzzle.render(Gdx.graphics.getDeltaTime());
fourPicsOneWord.render(Gdx.graphics.getDeltaTime());
entity.changeState(NinjaRabbitState.IDLE);
byte worldValue = status.getCurrentWorld();
//short levelValue = status.getCurrentLevel();
short mgValue = status.getMGValue();
if (worldValue == 1)
//short easyValue = status.getEqaValue();
if (mgValue == 1)
multipleChoice.setVisible(true);
Gdx.input.setInputProcessor(multipleChoice.stage);
if (multipleChoice.enterAnswer.isPressed())
multipleChoice.setVisible(false);
Gdx.input.setInputProcessor(new NinjaRabbitInputProcessor(ninja));
else if (mgValue == 2)
wordscapes.setVisible(true);
Gdx.input.setInputProcessor(wordscapes.stage);
if (wordscapes.enterAnswer.isPressed())
wordscapes.setVisible(false);
Gdx.input.setInputProcessor(new NinjaRabbitInputProcessor(ninja));
else if (mgValue == 3)
letterPuzzle.setVisible(true);
Gdx.input.setInputProcessor(letterPuzzle.stage);
if (letterPuzzle.enterAnswer.isPressed())
letterPuzzle.setVisible(false);
Gdx.input.setInputProcessor(new NinjaRabbitInputProcessor(ninja));
else if (mgValue == 4)
fourPicsOneWord.setVisible(true);
Gdx.input.setInputProcessor(fourPicsOneWord.stage);
if (fourPicsOneWord.enterAnswer.isPressed())
fourPicsOneWord.setVisible(false);
Gdx.input.setInputProcessor(new NinjaRabbitInputProcessor(ninja));
else if (worldValue == 2)
//short hardValue = status.getHqaValue();
if (mgValue == 1)
multipleChoice.setVisible(true);
Gdx.input.setInputProcessor(multipleChoice.stage);
if (multipleChoice.enterAnswer.isPressed())
multipleChoice.setVisible(false);
Gdx.input.setInputProcessor(new NinjaRabbitInputProcessor(ninja));
else if (mgValue == 2)
wordscapes.setVisible(true);
Gdx.input.setInputProcessor(wordscapes.stage);
if (wordscapes.enterAnswer.isPressed())
wordscapes.setVisible(false);
Gdx.input.setInputProcessor(new NinjaRabbitInputProcessor(ninja));
else if (mgValue == 3)
letterPuzzle.setVisible(true);
Gdx.input.setInputProcessor(letterPuzzle.stage);
if (letterPuzzle.enterAnswer.isPressed())
letterPuzzle.setVisible(false);
Gdx.input.setInputProcessor(new NinjaRabbitInputProcessor(ninja));
else if (mgValue == 4)
fourPicsOneWord.setVisible(true);
Gdx.input.setInputProcessor(fourPicsOneWord.stage);
if (fourPicsOneWord.enterAnswer.isPressed())
fourPicsOneWord.setVisible(false);
Gdx.input.setInputProcessor(new NinjaRabbitInputProcessor(ninja));
@Override
public boolean handleMessage(final Telegram msg)
renderGameOver = msg.message == MessageType.GAME_OVER.code();
renderLevelEnd = msg.message == MessageType.FINISH_LEVEL.code();
minicamSelection = msg.message == MessageType.COLLECTED.code();
return true;
@Override
public void resize(final int width, final int height)
gameOver.resize(width, height);
levelEnd.resize(width, height);
multipleChoice.resize(width, height);
wordscapes.resize(width, height);
letterPuzzle.resize(width, height);
fourPicsOneWord.resize(width, height);
@Override
public void dispose()
gameOver.dispose();
levelEnd.dispose();
multipleChoice.dispose();
wordscapes.dispose();
letterPuzzle.dispose();
fourPicsOneWord.dispose();
这是我想在收到消息时显示的弹出小游戏之一，并在单击按钮时隐藏。：MultipleChoice.java
public class MultipleChoice implements Disposable
private static final String QUESTION_LABEL = "CHECKPOINT: MULTIPLE CHOICE";
private static final String ENTER_ANSWER = "ENTER";
private static final String HINT_ANSWER = "HINT";
public final Stage stage;
private final NinjaRabbit ninja;
private final Label QuestionLabel;
private final Label QuestionText;
private final TextButton answer1;
private final TextButton answer2;
private final TextButton answer3;
private final TextButton answer4;
public final TextButton enterAnswer;
private final TextButton enterHints;
private final Table table;
public MultipleChoice(final AssetManager assets, final FuegoPeligro game,
final NinjaRabbit ninjaRabbit)
stage = new Stage(new ScreenViewport(), game.getBatch());
ninja = ninjaRabbit;
Label.LabelStyle style = new Label.LabelStyle();
AssetManager assetManager = new AssetManager();
assetManager.load(Assets.GAME_UI_SKIN);
assetManager.finishLoading();
Skin skin = assetManager.get(Assets.GAME_UI_SKIN);
style.fontColor = Color.WHITE;
style.font = assets.get(Assets.HUD_FONT);
QuestionLabel = new Label(QUESTION_LABEL, style);
style.fontColor = Color.WHITE;
style.font = assets.get(Assets.HUD_FONT);
QuestionText = new Label("", style);
answer1 = new TextButton("", skin);
answer1.addListener(new ClickListener()
@Override
public void clicked(final InputEvent event, final float x, final float y)
);
answer2 = new TextButton("", skin);
answer2.addListener(new ClickListener()
@Override
public void clicked(final InputEvent event, final float x, final float y)
);
answer3 = new TextButton("", skin);
answer3.addListener(new ClickListener()
@Override
public void clicked(final InputEvent event, final float x, final float y)
);
answer4 = new TextButton("", skin);
answer4.addListener(new ClickListener()
@Override
public void clicked(final InputEvent event, final float x, final float y)
);
// enter answer
enterAnswer = new TextButton(ENTER_ANSWER, skin);
enterAnswer.addListener(new ClickListener()
@Override
public void clicked(final InputEvent event, final float x, final float y)
);
// enter hints
enterHints = new TextButton(HINT_ANSWER, skin);
enterHints.addListener(new ClickListener()
@Override
public void clicked(final InputEvent event, final float x, final float y)
);
table = new Table();
table.setFillParent(true);
table.setDebug(true);
table.add(QuestionLabel).expand(true, false).center();
table.row().pad(20, 0, 0, 10);
table.add(QuestionText).expand(true, false);
table.row().pad(10, 0, 0, 20);
table.add(answer1).expand(true, false);
table.add(answer2).expand(true, false);
table.row().pad(10, 0, 0, 20);
table.add(answer3).expand(true, false);
table.add(answer4).expand(true, false);
table.row().pad(10, 0, 0, 20);
table.add(enterAnswer).expand(true, false);
table.add(enterHints).expand(true, false);
table.setVisible(false);
stage.addActor(table);
stage.setKeyboardFocus(table);
public void render(final float delta)
Gdx.gl20.glEnable(GL20.GL_BLEND);
Gdx.gl.glBlendFunc(GL20.GL_SRC_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA);
Gdx.gl20.glDisable(GL20.GL_BLEND);
stage.getBatch().end();
stage.act(delta);
stage.draw();
stage.getBatch().begin();
public void resize(final int width, final int height) stage.getViewport().update(width, height);
@Override
public void dispose()
stage.dispose();
public void setVisible(boolean value)
table.setVisible(value);
【问题讨论】：
【参考方案1】：在使用 LibGDX 时，UI 的标准约定是使用 Scene2D，并且 Scene2D 对象必须包含在 Stage 中 - 要使用类似覆盖的窗口，可以使用特殊的 Table 派生词：Window类。
您希望在叠加层中的任何Actors 都可以添加到Window 实例中，并像它自己的Stage 或Table 一样定位，并且Window 可以添加到场景中并从场景中移除 - 甚至使用 fade(In/Out) 操作淡入和淡出（而不是像以下示例中那样直接添加和移除）：
public class ExampleClass
...
private Stage stage = new Stage(...);
private Window popUp = new Window("...");
private TextButton windowButton1 = ..., windowButton2 = ...;
...
public ExampleClass()
...
Gdx.setInputProcessor(stage); //Allows input to Scene2D components - important!
//Register click listeners to buttons to close window when clicked
windowButton1.addListener(new CloseButtonListener(this));
windowButton2.addListener(new CloseButtonListener(this));
...
//Add buttons to window
popUp.add(windowButton1);
popUp.add(windowButton2);
...
//Run when message is received
public void messageReceived()
...
stage.add(popUp); //Add window to stage you want to overlay
...
...
public Stage getStage()
return stage;
public Window getPopUp()
return popUp;
...
class CloseButtonListener implements ClickListener //Inner class for handling button clicks, multiple can be created for different button types with different logic when window is closed.
private ExampleClass exampleInstance;
public CloseButtonListener(ExampleClass exampleInstance)
this.exampleInstance = exampleInstance;
//Remove the window from the stage when the button is clicked, handles any other logic too depending on button.
@Override
public void clicked(InputEvent event, float x, float y)
...
exampleInstance.addAction(Actions.removeActor());
...
【讨论】：
我正在使用 LibGDX 1.9.6 beta 5 的修改版本。我在舞台上找不到 .removeActor。仅 removeCaptureListener、removeListener 和 removeTouchFocus。 @JohnDanielEsguerra 修正了我的答案，抱歉！以上是关于LibGDX：如何从主游戏屏幕重复显示/隐藏覆盖弹出菜单的主要内容，如果未能解决你的问题，请参考以下文章
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