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WPF Drag & drop from ListBox with SelectionMode Multiple

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后悔当初
后悔当初 2020-12-29 22:47

I\'ve almost got this working apart from one little annoying thing...

Because the ListBox selection happens on mouse down, if you start the drag with the mouse down

4条回答
  • 死守一世寂寞
    死守一世寂寞 (楼主)
    2020-12-29 23:04

    One option would be not to allow ListBox or ListView to remove selected items until MouseLeftButtonUp is triggered. Sample code:

        List removedItems = new List();

    private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (e.RemovedItems.Count > 0)
        {
            ListBox box = sender as ListBox;
            if (removedItems.Contains(e.RemovedItems[0]) == false)
            {
                foreach (object item in e.RemovedItems)
                {
                    box.SelectedItems.Add(item);
                    removedItems.Add(item);
                }
            }
        }
    }

    private void ListBox_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
    {
        if (removedItems.Count > 0)
        {
            ListBox box = sender as ListBox;
            foreach (object item in removedItems)
            {
                box.SelectedItems.Remove(item);
            }
            removedItems.Clear();
        }
    }

    
    
             
    
                                                        
    
            
            
    
              
                
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