Home / Community & Support / Developer Productivity Tools Forums / WinForms > Treeview > Disable Right Click Selection Change

• John

  Posted on Oct 5, 2011 (permalink)

  By default the tree view will change selection by clicking on a item with left or right mouse, I need to prevent the selected item from changing when a item is clicked with the right mouse, instead i need to hilight the item and pop a context menu.
  Also where do you change the color of the selected background?
  Thanks
  
  

  Reply

• Ivan Petrov Ivan Petrov

  Posted on Oct 11, 2011 (permalink)

  Hi John,

  Thank you for writing.
  
  You can cancel the selection with right mouse button in the RadTreeView SelectedNodeChanging event using the following code:

  void radTreeView1_SelectedNodeChanging(object sender, RadTreeViewCancelEventArgs e)

  {

    if (Control.MouseButtons == MouseButtons.Right)

    {

      e.Cancel = true;

    }

  }

  In the MouseDown event you can highlight the node you click and show your context menu. Here is a code snippet on how to do that:
  

  void radTreeView1_MouseDown(object sender, MouseEventArgs e)

  {

    if (e.Button == MouseButtons.Right)

    {

      RadElement element = this.radTreeView1.ElementTree.GetElementAtPoint(e.Location);

      if (!(element is TreeNodeElement))

      {

        element = element.FindAncestor<TreeNodeElement>();

      }

   

      if (element  as TreeNodeElement != null)

      {

        ((TreeNodeElement)element).DrawFill = true;

        ((TreeNodeElement)element).BackColor = Color.Red;

      }

    }

  }

   

  void radTreeView1_NodeFormatting(object sender, TreeNodeFormattingEventArgs e)

  {

    e.NodeElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);

    e.NodeElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);

  }

  You need the code in the ItemFormatting event to remove the highlighting of the item.
  
  I hope this will be useful for you. If you need further assistance, I would be glad to help. All the best,
  Ivan Petrov
  the Telerik team

  Q2’11 SP1 of RadControls for WinForms is available for download (see what's new); also available is the Q3'11 Roadmap for Telerik Windows Forms controls.

  Reply

• Marcus

  Posted on Nov 3, 2011 (permalink)

  I did solve this in a different way:
  

  Private m_lstSelectedNodes As New List(Of RadTreeNode)

Private Sub rtvTest_SelectedNodeChanged(sender As Object, e As Telerik.WinControls.UI.RadTreeViewEventArgs) Handles rtvTask.SelectedNodeChanged

   

      If Control.MouseButtons <> Windows.Forms.MouseButtons.Left Then

          For Each rtvnNode As RadTreeNode In m_lstSelectedNodes

              rtvnNode.Selected = True

          Next

   

          m_lstSelectedNodes.Clear()

      End If

   

  End Sub

   

  Private Sub rtvTest_SelectedNodeChanging(sender As Object, e As Telerik.WinControls.UI.RadTreeViewCancelEventArgs) Handles rtvTest.SelectedNodeChanging 

      If Control.MouseButtons = Windows.Forms.MouseButtons.Right Then

          m_lstSelectedNodes.Clear()

          For Each rtvnNode As RadTreeNode In rtvTask.SelectedNodes

              m_lstSelectedNodes.Add(rtvnNode)

          Next

   

          e.Cancel = True

      End If

  End Sub

  
  

  Reply

• Ivan Petrov Ivan Petrov

  Posted on Nov 7, 2011 (permalink)

  Hi Marcus,

  Thank you for sharing your solution.
  
  The solution you have came up with is perfectly legal with only one minor draw back - the memory you need for the selected nodes collection you have to keep and the triggering of the selection events again. When you set the Selected property of a node, you trigger all the events that follow a selection, involving the events in which you trigger it.
  
  I hope this will be useful for you. Should you need further assistance, feel free to write back.

  Best wishes,
  Ivan Petrov
  the Telerik team

  Q2’11 SP1 of RadControls for WinForms is available for download (see what's new); also available is the Q3'11 Roadmap for Telerik Windows Forms controls.

  Reply

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