PullToRefreshBase.java 文件源码

private final void smoothScrollTo(int newScrollValue, long duration, long delayMillis, OnSmoothScrollFinishedListener listener) {
    int oldScrollValue;
    if (this.mCurrentSmoothScrollRunnable != null) {
        this.mCurrentSmoothScrollRunnable.stop();
    }
    switch (getPullToRefreshScrollDirection()) {
        case HORIZONTAL:
            oldScrollValue = getScrollX();
            break;
        default:
            oldScrollValue = getScrollY();
            break;
    }
    if (oldScrollValue != newScrollValue) {
        if (this.mScrollAnimationInterpolator == null) {
            this.mScrollAnimationInterpolator = new DecelerateInterpolator();
        }
        this.mCurrentSmoothScrollRunnable = new SmoothScrollRunnable(oldScrollValue, newScrollValue, duration, listener);
        if (delayMillis > 0) {
            postDelayed(this.mCurrentSmoothScrollRunnable, delayMillis);
        } else {
            post(this.mCurrentSmoothScrollRunnable);
        }
    }
}