boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)方法详解

最新推荐文章于 2023-01-16 16:01:23 发布

胜天半子_王二_王半仙

最新推荐文章于 2023-01-16 16:01:23 发布

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分类专栏： android

本文链接：https://blog.youkuaiyun.com/qq_40666620/article/details/90714225

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博客提及在某方法中，distanceX和distanceY代表两次时间在X、Y轴上的距离，还提到了相关设置情况。

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* @param e1 The first down motion event that started the scrolling.
* @param e2 The move motion event that triggered the current onScroll.

* @param distanceX The distance along the X axis that has been scrolled since the last
*              call to onScroll. This is NOT the distance between {@code e1}
*              and {@code e2}.
* @param distanceY The distance along the Y axis that has been scrolled since the last
*              call to onScroll. This is NOT the distance between {@code e1}
*              and {@code e2}.

可以看出，在

boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY);

方法中，distanceX，和distanceY就是两次时间X，Y轴上的距离

设置是可以为：

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
    //从之前的基础上开始
    currentMaxtrix.set(imageView.getImageMatrix());
    matrix.set(currentMaxtrix);
    //进行移动
    matrix.preTranslate((int)(-1)*distanceX,(int)(-1)*distanceY);
    //重新设置图片位置
    imageView.setImageMatrix(matrix);
    return true;
}