在Windows Phone 8.1中爲分組ListView實現LoadMore分頁？

Question

是否有可能在分組列表視圖（CollectionViewSource）中應用ListViewBase.LoadMoreItemsAsync分頁方法。或者，也許你知道另一種方式，請讓我知道。

Answer 1

你可以做到這一點是這樣的： 在您的ListView添加「裝」事件與此代碼：

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; 
     } 

，現在在ViewChangeEvent您可以指定要裝入多個項目，並真正做到這一點：

 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; 
     }