作为按钮的多个行为体-检测哪个被触摸/点击

Question

我有一个屏幕上有8个不同的静态按钮。我写了一个课程让这件事变得简单：

public class TouchButton extends Actor{
    Texture texture;
    float actorX, actorY;
    int actorWidth, actorHeight;
    public boolean started = false;

    public TouchButton(String argButtonID, float argActorX, float argActorY, int argWidth, int argHeight){

        String file = argButtonID;
        texture = new Texture(Gdx.files.internal(file));
        this.actorX = argActorX;
        this.actorY = argActorY;
        this.actorWidth = argWidth;
        this.actorHeight = argHeight;

        setBounds(actorX, actorY, argWidth, argHeight);
        addListener(new InputListener(){
            public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
                ((TouchButton)event.getTarget()).started = true;

                Gdx.app.debug("BUTTON", "pressed" );

                Gdx.input.vibrate(100);
                return true;
            }
        });
    }

    @Override
    public void draw(Batch batch, float alpha){
         batch.draw(texture,actorX,actorY,this.actorWidth, this.actorHeight);
    }

    @Override
    public void act(float delta){
        if(started){
            actorX+=5;
        }
    }
}

正如您在上面的代码中所看到的，我正在给LogCat写一条消息，但我一直无法确定如何确定按下了哪个按钮。

在我的游戏中，有点像“西蒙”，我希望显示一个颜色或形状，然后让玩家点击正确的颜色匹配按钮-所以我需要知道他们按了哪个按钮。

我的按钮实例化如下，我的主游戏屏幕实现屏幕。

    purpleButton = new TouchButton("shapes/purple.jpg", 0.0f, stage.getHeight() - 256, 256, 256);
    purpleButton.setTouchable(Touchable.enabled);
    stage.addActor(purpleButton);

    pinkButton = new TouchButton("shapes/pink.jpg", stage.getWidth() - 256, 0.0f, 256, 256);
    pinkButton.setTouchable(Touchable.enabled);
    stage.addActor(pinkButton);

如果能提供任何帮助，我们将不胜感激。

我如何在我的主要游戏课上听这些按钮触摸事件，并确定哪个是按下的？

非常感谢

詹姆斯

Answer 1

在创建TouchButton对象时，可以将标识符索引作为参数传递。

然后，当按下按钮时，只需将静态int lastPressIndex设置为正在按下的按钮的索引。

public TouchButton(String argButtonID, float argActorX, float argActorY, int argWidth, int argHeight, int buttonIndex)

定义一个静态变量，表示按下的按钮：

public static int lastPressIndex = 0;

然后，在游戏循环(呈现方法)中，您可以检查lastButtonPressIndex的值，并查看按下它的索引的哪个按钮传递。

您的TouchButton类应该如下所示：

public class TouchButton extends Actor{
    Texture texture;
    float actorX, actorY;
    int actorWidth, actorHeight;
    public boolean started = false;
    private int buttonIndex = 0; // New stuff

    public static int lastPressIndex = 0; // New stuff/

    public TouchButton(String argButtonID, float argActorX, float argActorY, int argWidth, int argHeight, int buttonIndex){ // new parameter

        String file = argButtonID;
        texture = new Texture(Gdx.files.internal(file));
        this.actorX = argActorX;
        this.actorY = argActorY;
        this.actorWidth = argWidth;
        this.actorHeight = argHeight;
        this.buttonIndex = buttonIndex; // new stuff

        setBounds(actorX, actorY, argWidth, argHeight);
        addListener(new InputListener(){
            public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
                ((TouchButton)event.getTarget()).started = true;

                Gdx.app.debug("BUTTON", "pressed" );
                TouchButton.lastPressIndex = this.buttonIndex; // new stuff
                Gdx.input.vibrate(100);
                return true;
            }
        });
    }

    @Override
    public void draw(Batch batch, float alpha){
         batch.draw(texture,actorX,actorY,this.actorWidth, this.actorHeight);
    }

    @Override
    public void act(float delta){
        if(started){
            actorX+=5;
        }
    }
}

在创建TouchButton实例时，只需跟踪哪个按钮属于哪个索引。HashMap应该是最好的选择。

HashMap<Integer, TouchButton) holdsButtons = new HashMap<Integer, TouchButton>();

holdsButtons.put(1, new TouchButton("shapes/purple.jpg", 0.0f, stage.getHeight() - 256, 256, 256, 1)); // Created the TouchButton and made a relation between the object and an Integer value, in this case 1.

在您的渲染方法中：

public void render() {
   if(TouchButton.lastPressIndex > 0) { // Making sure a button is actually pressed.
        TouchButton pressedButton = holdsButtons.get(TouchButton.lastPressIndex);
        // Now you know which button was pressed.
        TouchButton.lastPressIndex = 0; // Reset the value.
    }
}