KB145681 - FIX: TreeView Nodeclick Differences with Mouse and Keyboard

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When the current node of a TreeView control is touched using the mouse, the SelectedItem property is updated after the NodeClick event. When the node is modified by using the keyboard, SelectedItem is updated before the NodeClick. This makes it difficult to execute code based on the Node object because a different object will be passed to the NodeClick event depending on whether the mouse or keyboard was used to generate the NodeClick. For example, if the intent of the code in the NodeClick event should be fired only when a new node is clicked upon, the following line of code will work fine if the mouse is used, but will not work if a user changes the selected node with the keyboard:

   If Node = TreeView1.SelectedItem Then Exit Sub

Steps to Reproduce

Start Visual Basic 4.0, or, if it is already running, start a new project.
Add a single TreeView control to the form.

Add this code to the Form_Load event of Form1:

   Private Sub Form_Load()
      Dim nodX as Node
      Dim i As Integer

      For i = 1 To 10
         Set nodX = TreeView1.Nodes.Add(, , , "Node " & i)
      Next i
   End Sub

Add this code to the TreeView1_NodeClick event of the TreeView control:

   Private Sub TreeView1_NodeClick(ByVal Node As Node)
       If Node = TreeView1.SelectedItem Then
           Debug.Print "Clicked on same node"
       Else
           Debug.Print "Clicked on other node"
       End If
   End Sub

Press F5 to start the application. Click on Node 1 and see the string "Clicked on same node" in the debug window (as expected). Click on Node 2 and see "Clicked on other node" in the debug window (also as expected). Now use the down arrow key to move from Node 2 to Node 3. The output string seen in the debug window is "Clicked on same node."

FIX: TreeView Nodeclick Differences with Mouse and Keyboard

SYMPTOMS

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Steps to Reproduce