WPF ListView 简单的拖拽实现(转)

首先设置ListView的AllowDrop=True；SelectionMode=Extended;并且ListView视图为GridVIew。

private void listView1_MouseMove(object sender, MouseEventArgs e)  
      {  
          ListView listview = sender as ListView;  
          if (e.LeftButton == MouseButtonState.Pressed)  
          {  
              System.Collections.IList list = listview.SelectedItems as System.Collections.IList;  
              DataObject data = new DataObject(typeof(System.Collections.IList), list);  
              if (list.Count > 0)  
              {  
                  DragDrop.DoDragDrop(listview, data, DragDropEffects.Move);  
              }  
          }  
      }  
  
      private void listView1_Drop(object sender, DragEventArgs e)  
      {  
          if (e.Data.GetDataPresent(typeof(System.Collections.IList)))  
          {  
              System.Collections.IList peopleList = e.Data.GetData(typeof(System.Collections.IList)) as System.Collections.IList;  
              //index为放置时鼠标下元素项的索引  
              int index = GetCurrentIndex(new GetPositionDelegate(e.GetPosition));  
              if (index > -1)  
              {  
                  LogMessage Logmess = peopleList[0] as LogMessage;  
                  //拖动元素集合的第一个元素索引  
                  int OldFirstIndex = StreamHelper.List.IndexOf(Logmess);  
                  //下边那个循环要求数据源必须为ObservableCollection<T>类型，T为对象  
                  for (int i = 0; i < peopleList.Count; i++)  
                  {  
                      StreamHelper.List.Move(OldFirstIndex, index);  
                  }  
                  listView1.SelectedItems.Clear();  
              }  
          }  
      }  
  
      private int GetCurrentIndex(GetPositionDelegate getPosition)  
      {  
          int index = -1;  
          for (int i = 0; i < listView1.Items.Count; ++i)  
          {  
              ListViewItem item = GetListViewItem(i);  
              if (item != null && this.IsMouseOverTarget(item, getPosition))  
              {  
                  index = i;  
                  break;  
              }  
          }  
          return index;  
      }  
  
      private bool IsMouseOverTarget(Visual target, GetPositionDelegate getPosition)  
      {  
          Rect bounds = VisualTreeHelper.GetDescendantBounds(target);  
          Point mousePos = getPosition((IInputElement)target);  
          return bounds.Contains(mousePos);  
      }  
  
      delegate Point GetPositionDelegate(IInputElement element);  
  
      ListViewItem GetListViewItem(int index)  
      {  
          if (listView1.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)  
              return null;  
          return listView1.ItemContainerGenerator.ContainerFromIndex(index) as ListViewItem;  
      }  

其中StreamHelper.List是StreamHelper类里边有一个静态的ObservableCollection<LogMessage>集合名字为List；

LogMessage就是集合里边的T对象了；