Home / Community & Support / Developer Productivity Tools Forums / WPF > TreeView > Handling click not on items?

• Anders

  Posted on Oct 10, 2011 (permalink)

  Hi telerik,
  
  I wish to handle the event that the user clicks somewhere in the tree where there are no items.
  
  I would have thought that the MouseDown fired but apparently it doesn't.
  
  Do you have any advice on what to do?
  
  Thanks,
  
  Anders, Denmark

  Reply

• Petar Mladenov Petar Mladenov

  Posted on Oct 13, 2011 (permalink)

  Hello Anders,

   The MouseLeftButton down event is handled by other RadTreeView's events. So you have to attach to it by the UIElement.AddHandler() method providing ability to use handled events:

  this.ExplorerTree.AddHandler(RadTreeView.MouseLeftButtonDownEvent, new MouseButtonEventHandler(ExplorerTree_MouseLeftButtonDown), true);

  You can also find this realized in the attached solution. Please let us know if this is what you expect. Best wishes,
  Petar Mladenov
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Attached files

  • WPF-TreeViewTest.zip

  Reply

• Anders

  Posted on Oct 13, 2011 (permalink)

  Hi Petar,
  
  Yes, this way the event fires just fine!
  
  However, I need to react only to clicks outside the tree items.
  
  Can I translate the position of the click to an item somehow? I've looked at the methods on the treeview without finding any obvious candidates.
  
  (Furthermore this event fires before the 'ordinary' treeview events making it hard to 'hack' it throgh e.g. registering time stamp om last click on items and then checking in the 'raw' click event).
  
  Thanks,
  
  Anders

  Reply

• Answer Tina Stancheva Tina Stancheva

  Posted on Oct 18, 2011 (permalink)

  Hello Anders,
  
  In your case it is best to use the MouseLeftButtonDownEvent but check the OriginalSource of the event. If it has a parent of type RadTreeViewItem then the event is fired after clicking an item, but if the original source of the event isn't a RadTreeViewItem element, then the click is somewhere in the RadTreeView but outside an item.
  
  I modified the solution to illustrate this approach. Please have a look at it and let em know if it works for you.
  
  All the best,
  Tina Stancheva
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Attached files

  • 306489-WPF-TreeViewTest.zip

  Reply

• Anders

  Posted on Nov 30, 2011 (permalink)

  It took me some time before the task crawled back up the list of backlog items ;)
  Bu the solution works just fine! Thanks for helping out...
  
  Regrads, Anders, Denmark...

  Reply

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