PRB: Arrow Key Doesn't Fire Keypress Tree/Listview Controls

ID: Q143405

The information in this article applies to:

- Standard, Professional and Enterprise Editions of Microsoft

  Visual Basic, 32-bit only, for Windows, version 4.0

SUMMARY

Pressing an arrow key does not fire the keypress event for the Treeview and Listview controls because they have built-in functionality for these keys. It is not obvious which event is available to determine that the selected node has changed because of this behavior.

MORE INFORMATION

The ItemClick event for the Listview control and the NodeClick for the Treeview control get fired whenever an item's selection changes, even if it changes as a result of a keystroke.

Steps to Reproduce Behavior

1. Start Visual Basic and click New Project (ALT, F, N) on the File menu.

2. Click Custom controls on the Tools menu.

3. Inside of the Custom controls dialog box, check the "Microsoft Windows

   Common Controls."  Then click the OK button.

4. Place a TreeView control on the form.

5. Insert the following code in the Form_Load event:

      Private Sub Form_Load()
   
      Dim nodX As Node
      Set nodX = TreeView1.Nodes.Add(, , "Root", "Root")
      Set nodX = TreeView1.Nodes.Add("Root", 4, "Node1", "Node1")
      Set nodX = TreeView1.Nodes.Add("Node1", 4, "Node2", "Node2")
      Set nodX = TreeView1.Nodes.Add("Node2", 4, "Node3", "Node3")
   
      End Sub

6. Add the following line to the TreeView1_Keydown event:

     Debug.Print  "TreeView Keydown "; KeyCode

7. Add the following line to the Form_Keydown event:

     Debug.Print  "Form Keydown "; KeyCode

8. Set the Form's KeyPreview property to True.

9. Run the program. The TreeView control should have the focus. Use the

   arrow keys to move around the tree. Note that the keydown events are not
   triggered and no text appears in the debug window.

10. Press the letter "N." Note that the node having the focus changes and

    you can monitor the keys in the debug window. This works correctly.

Keywords          : kbcode kbVBp400 PrgOther VB4WIN kb32bitOnly 
Version           : 4.0
Platform          : NT WINDOWS
Issue type        : kbprb

Last Reviewed: August 15, 1997