private void _scrollViewer_LayoutUpdated(object sender, object e) //TODO:还需要设置好PullUpLoadMore 怎么控制反向更新
{
//当上滑动加载更多数据 提前400像素 且当前非加载更多状态
if (ScrollViewer.ScrollableHeight != 0 && (ScrollViewer.ScrollableHeight - ScrollViewer.VerticalOffset) < 400)
{
var time = DateTime.Now;
if (((time - _loadMoreTime).TotalSeconds > 1.5) && ListViewRequestDataContext != null && ListViewRequestDataContext.IsShowPullUpLoadMore && !ListViewRequestDataContext.IsPullUpLoadMoreStatus && null != PullUpLoadMore && !ListViewRequestDataContext.IsPullDownRefreshStatus)
{
_loadMoreTime = time;
ListViewRequestDataContext.IsPullUpLoadMoreStatus = true;
PullUpLoadMore.Invoke(this, null);
//Debug.WriteLine("MoreDateCommand");
}
}
//Debug.WriteLine("_scrollViewer_LayoutUpdated:" + " VerticalOffset" + _scrollViewer.VerticalOffset + " ViewportTop=" + PullDownOffset + " Height:" + _scrollViewer.ScrollableHeight);
}
private void SetTappedCommand()
{
_pullUpLoadMoreControl.Tapped += (s, e) =>
{
if (IsShowPullUpLoadMore && !ListViewRequestDataContext.IsPullUpLoadMoreStatus && null != PullUpLoadMore)
{
ListViewRequestDataContext.IsPullUpLoadMoreStatus = true;
PullUpLoadMore.Invoke(this, null);
}
};
_emptyControl.Tapped += (s, e) =>
{
if (IsShowEmpty && null != EmptyClick)
{
EmptyClick.Invoke(this, null);
}
};
}
