在WindowsPhone8.1中实现分组ListView的LoadMore分页

本文关键字：ListView LoadMore 分页 WindowsPhone8 实现 | 更新日期: 2023-09-27 18:22:29

是否可以在分组的ListView（CollectionViewSource）中应用ListViewBase.LoadMoreItemsSync方法进行分页。或者你知道另一种方式，请告诉我。

在WindowsPhone8.1中实现分组ListView的LoadMore分页

您可以这样做：在您的ListView上添加"Loaded"事件，代码为：

 private void LvPictures_OnLoaded(object sender, RoutedEventArgs e)
 {
     ScrollViewer viewer = GetScrollViewer(this.LvPictures);
     viewer.ViewChanged += LvPictures_ViewChanged;
 }

public static ScrollViewer GetScrollViewer(DependencyObject depObj)
      {
          if (depObj is ScrollViewer) return depObj as ScrollViewer;
          for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
          {
              var child = VisualTreeHelper.GetChild(depObj, i);
              var result = GetScrollViewer(child);
              if (result != null) return result;
          }
          return null;
      }

现在，在ViewChangeEvent中，您可以指定何时加载更多项目，并实际执行以下操作：

     private async void LvPictures_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
      {
          ScrollViewer view = (ScrollViewer)sender;
          double progress = view.VerticalOffset / view.ScrollableHeight;
          if (progress > 0.8 & !_incallFilesList && NextPagePicturesAvailable)
          {
              _incallFilesList = true;
              GetNextPicturesPageAsync();
          }
          _incallFilesList = false;
      }
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