/**
* 处理手指抬起事件
*
* @return true表示自己消耗掉该事件，false表示不消耗该事件
*/
private boolean handleActionUpOrCancel(MotionEvent event) {
boolean isReturnTrue = false;
// 如果当前头部刷新控件没有完全隐藏，则需要返回true，自己消耗ACTION_UP事件
if ((mCustomHeaderView == null || (mCustomHeaderView != null && !mIsCustomHeaderViewScrollable))
&& mWholeHeaderView.getPaddingTop() != mMinWholeHeaderViewPaddingTop) {
isReturnTrue = true;
}
if (mCurrentRefreshStatus == RefreshStatus.PULL_DOWN
|| mCurrentRefreshStatus == RefreshStatus.IDLE) {
// 处于下拉刷新状态，松手时隐藏下拉刷新控件
if (mCustomHeaderView == null
|| (mCustomHeaderView != null
&& mWholeHeaderView.getPaddingTop() < 0
&& mWholeHeaderView.getPaddingTop() > mMinWholeHeaderViewPaddingTop)) {
hiddenRefreshHeaderView();
}
mCurrentRefreshStatus = RefreshStatus.IDLE;
handleRefreshStatusChanged();
} else if (mCurrentRefreshStatus == RefreshStatus.RELEASE_REFRESH) {
// 处于松开进入刷新状态，松手时完全显示下拉刷新控件，进入正在刷新状态
beginRefreshing();
}
if (mRefreshDownY == -1) {
mRefreshDownY = (int) event.getY();
}
int diffY = (int) event.getY() - mRefreshDownY;
if (shouldHandleLoadingMore() && diffY <= 0) {
// 处理上拉加载更多，需要返回true，自己消耗ACTION_UP事件
isReturnTrue = true;
beginLoadingMore();
}
mWholeHeaderDownY = -1;
mRefreshDownY = -1;
return isReturnTrue;
}
/**
* 处理手指滑动事件
*
* @param event
* @return true表示自己消耗掉该事件，false表示不消耗该事件
*/
private boolean handleActionMove(MotionEvent event) {
if (mCurrentRefreshStatus == RefreshStatus.REFRESHING || mIsLoadingMore) {
return false;
}
if ((mCustomHeaderView == null || !mIsCustomHeaderViewScrollable) && mRefreshDownY == -1) {
mRefreshDownY = (int) event.getY();
}
if (mCustomHeaderView != null
&& mIsCustomHeaderViewScrollable
&& isCustomHeaderViewCompleteVisible()
&& mRefreshDownY == -1) {
mRefreshDownY = (int) event.getY();
}
int refreshDiffY = (int) event.getY() - mRefreshDownY;
refreshDiffY = (int) (refreshDiffY / mRefreshViewHolder.getPaddingTopScale());
// 如果是向下拉，并且当前可见的第一个条目的索引等于0，才处理整个头部控件的padding
if (refreshDiffY > 0 && shouldHandleRefresh() && isCustomHeaderViewCompleteVisible()) {
int paddingTop = mMinWholeHeaderViewPaddingTop + refreshDiffY;
if (paddingTop > 0 && mCurrentRefreshStatus != RefreshStatus.RELEASE_REFRESH) {
// 下拉刷新控件完全显示，并且当前状态没有处于释放开始刷新状态
mCurrentRefreshStatus = RefreshStatus.RELEASE_REFRESH;
handleRefreshStatusChanged();
mRefreshViewHolder.handleScale(1.0f, refreshDiffY);
} else if (paddingTop < 0) {
// 下拉刷新控件没有完全显示，并且当前状态没有处于下拉刷新状态
if (mCurrentRefreshStatus != RefreshStatus.PULL_DOWN) {
boolean isPreRefreshStatusNotIdle = mCurrentRefreshStatus != RefreshStatus.IDLE;
mCurrentRefreshStatus = RefreshStatus.PULL_DOWN;
if (isPreRefreshStatusNotIdle) {
handleRefreshStatusChanged();
}
}
float scale = 1 - paddingTop * 1.0f / mMinWholeHeaderViewPaddingTop;
/**
* 往下滑 paddingTop mMinWholeHeaderViewPaddingTop 到 0 scale 0 到 1 往上滑 paddingTop 0 到
* mMinWholeHeaderViewPaddingTop scale 1 到 0
*/
mRefreshViewHolder.handleScale(scale, refreshDiffY);
}
paddingTop = Math.min(paddingTop, mMaxWholeHeaderViewPaddingTop);
mWholeHeaderView.setPadding(0, paddingTop, 0, 0);
if (mRefreshViewHolder.canChangeToRefreshingStatus()) {
mWholeHeaderDownY = -1;
mRefreshDownY = -1;
beginRefreshing();
}
return true;
}
if (mCustomHeaderView != null && mIsCustomHeaderViewScrollable) {
if (mWholeHeaderDownY == -1) {
mWholeHeaderDownY = (int) event.getY();
if (mCustomHeaderView != null) {
mWholeHeaderViewDownPaddingTop = mWholeHeaderView.getPaddingTop();
}
}
int wholeHeaderDiffY = (int) event.getY() - mWholeHeaderDownY;
if ((mPullDownRefreshEnable && !isWholeHeaderViewCompleteInvisible())
|| (wholeHeaderDiffY > 0 && shouldInterceptToMoveCustomHeaderViewDown())
|| (wholeHeaderDiffY < 0 && shouldInterceptToMoveCustomHeaderViewUp())) {
int paddingTop = mWholeHeaderViewDownPaddingTop + wholeHeaderDiffY;
if (paddingTop < mMinWholeHeaderViewPaddingTop - mCustomHeaderView.getMeasuredHeight()) {
paddingTop = mMinWholeHeaderViewPaddingTop - mCustomHeaderView.getMeasuredHeight();
}
mWholeHeaderView.setPadding(0, paddingTop, 0, 0);
return true;
}
}
return false;
}