java - 如何为 libgdx 中的按钮添加绘图功能？

Question

我正在使用 Screen-2D 构建一个按钮。我想给按钮一个功能，当单击时将绘制一个 Sprite ，我该怎么做。这不是我的全部代码，但足以展示我正在谈论的内容。

public void create () {
    buttonStyle = new TextButtonStyle();
    buttonStyle.up = skin.getDrawable("button");
    buttonStyle.over = skin.getDrawable("buttonpressed");
    buttonStyle.down = skin.getDrawable("buttonpressed");
    buttonStyle.font = font;
    button = new TextButton("START", buttonStyle);

    stage.addActor(button);
    Gdx.input.setInputProcessor(stage);
    button.addListener(new InputListener() {    
        @Override
        public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
            drawTile(200,50);
            return true;
        }
    });
}

// method used to draw a sprite when passing certain coordinates 
public void drawTile(int x , int y) {    
    spriteBatch.draw(sprite, x  , y   );
}

public void render () {
    Gdx.gl.glClearColor(1f, 0f, 0f, 1f);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    camera.update();
    spriteBatch.begin();
    spriteBatch.draw(background, 0, 0);
    drawGrid();
    spriteBatch.draw(startButton, 0, 0);
    stage.draw();
    spriteBatch.end()
}

Answer 1

你的想法是对的。请参阅此示例:

button.addListener(new ChangeListener() {
    @Override
    public void changed (ChangeEvent event, Actor actor) {
        drawTile(200,50);
    }
}); 

https://github.com/libgdx/libgdx/wiki/Scene2d.ui#changeevents