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CancelDrag Problems

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DragAndDrop
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Stephen
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Stephen asked on 20 May 2011, 01:35 AM
I am attempting to drag items from the RadTreeView to the RadScheduler. I do not want users to be able to drag items at the first level of the tree, so I attached a handler to the DragStarted event of the RadTreeView. Within that handler, I am checking the item being dragged, and if I don't want to allow dragging, I call RadDragAndDropManager.CancelDrag(). This is the same method used in the Scheduler drag and drop example. However, whenever CancelDrag gets called, it is causing the entire application to freeze. This appears to be the case in the example as well. You can drag items that are below the first level, but if you try to drag items at the first level, the application freezes. Please help me find a solution to this problem.

Thanks

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Tsvyatko
Telerik team
answered on 20 May 2011, 12:22 PM
Hello Stephen,

 Thank you for reporting this issue. We will fix this in one of our next internal builds. Meanwhile, you can use PreviewDragStarted event instead:

private void RadTreeView_PreviewDragStarted(object sender, Telerik.Windows.Controls.RadTreeViewDragEventArgs e)
{
       ....
   if([your condition])
  {
    RadDragAndDropManager.CancelDrag();
    e.Handled = true;
    return;
    }
    .....
}

Please, excuse us for the inconvenience caused.


Regards,
Tsvyatko
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Stephen
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answered on 23 May 2011, 09:09 PM
That works beautifully. Thank you!
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Stephen
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