SwipeClearLayout.java 文件源码

private void setTargetOffsetTopAndBottom(int offset) {
    circle.offsetTopAndBottom(offset);
    currentTargetOffsetTop = circle.getTop();
    int percent = (int) ((currentTargetOffsetTop / distanceToTriggerSync) * 100);
    if (onSwipeListener != null) {
        onSwipeListener.onSwipe(percent, currentTargetOffsetTop);
    }
    ViewCompat.setElevation(circle, percent);
    ImageView imageView = (ImageView) circle;
    ClipDrawable clipDrawable = (ClipDrawable) imageView.getDrawable();

    if (percent < 50) {
        clipDrawable.setLevel(0);
    } else {
        clipDrawable.setLevel((percent - 50) * 2 * 100);
    }
}