VerticalRuler.java 文件源码

@Override
public void scrollTo(@Px int x, @Px int y) {
    if (y < mMinPosition) {
        goStartEdgeEffect(y);
        y = mMinPosition;
    }
    if (y > mMaxPosition) {
        goEndEdgeEffect(y);
        y = mMaxPosition;
    }
    if (y != getScrollY()) {
        super.scrollTo(x, y);
    }

    mCurrentScale = scrollYtoScale(y);
    if (mRulerCallback != null) {
        mRulerCallback.onScaleChanging(Math.round(mCurrentScale));
    }

}