ImageButton 的边界

Question

我有一个按钮 (reloadButton)，它是一个 ImageButton

我想给它setBounds()，但问题是它的ImageButtonStyle.imageUp 和ImageButtonStyle.imageDown 是圆形图像，我不想让边界变成矩形，因为这个按钮可以被触摸

我怎样才能setBounds这个按钮？

这是我的代码

TextureRegion buttonUp = Assets.getTextureRegion(Assets.getTextureAtlas(Assets.reloadButton), "up"); 

TextureRegion buttonDown = Assets.getTextureRegion(Assets.getTextureAtlas(Assets.reloadButton), "down"); 

ImageButton.ImageButtonStyle buttonStyle = new ImageButton.ImageButtonStyle(); 

buttonStyle.imageUp = new TextureRegionDrawable(buttonUp); 

buttonStyle.imageDown = new TextureRegionDrawable(buttonDown); 

reloadButton = new ImageButton(buttonStyle);

 // reloadButton.addListener()

Answer 1

Actor 边界总是一个矩形。如果您想测试不同的形状，请覆盖 Actor 的 hit 方法。例如，对于圆角矩形，子类化 ImageButton 并执行此操作（其中rad 是圆角半径）：

@Override
public Actor hit (float x, float y, boolean touchable) {
    Actor hit = super.hit(x, y, touchable); //is in rectangle

    if (hit != null){ //reject corners if necessary
        boolean keep = true;
        if (x < rad){
            if (y < rad) keep = inCircle(x, y, rad, rad, rad);
            else if (y > getHeight() - rad) keep = inCircle(x, y, rad, getHeight() - rad, rad);
        } else if (x > getWidth() - rad){
            if (y < rad) keep = inCircle(x, y, getWidth() - rad, rad, rad);
            else if (y > getHeight() - rad) keep = inCircle(x, y, getWidth() - rad, getHeight() - rad, rad);
        }
        if (!keep) hit = null;
    }
    return hit;
}

private boolean inCircle(float x, float y, float centerX, float centerY, float radius) {
    float dx = x - centerX;
    float dy = y - centerY;
    return dx * dx + dy * dy <= radius * radius;
}