HorizontalRuler.java 文件源码

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

    mCurrentScale = scrollXtoScale(x);
    if (mRulerCallback != null) {
        mRulerCallback.onScaleChanging(Math.round(mCurrentScale));
    }

}