Question

I have a TreeView in VB6, when a Node’s Image (+ or -) is clicked the Node expands then immediately collapses, or vice versa. I have a TreeView Click method which expands/collapses a Node when it is clicked (simplified version shown below)

Private Sub MyTreeView_Click()

    Dim selectedNode As Node
    Dim nodeType As String

    Set selectedNode = MList2.SelectedItem
    If selectedNode Is Nothing Then
        Exit Sub
    End If

    nodeType = selectedNode.Key

    If nodeType = "MyNodeType" Then

        'Collapse Node if it's already expanded, otherwise expand it.
        If selectedNode .Expanded Then
            selectedNode .Expanded = False
        Else
            'Do some processing

            selectedNode .Expanded = True
        End If
    End If
End Sub

This works fine if the text part of the Node is clicked. However if the Image part of the Node is clicked the Node is expanded/collapsed before this EventHandler is reached, resulting in the Node immediately returning to its original state when it does hit this EventHandler. The first expand/collapse of the Node seems to occur on MouseDown on the Node Image.

Does anyone know how I can prevent the Node from been expanded/collapsed before hitting this EventHandler when the Node Image is clicked?

Any help would be greatly appreciated, thanks in advance.

Answer 1

You could use the TreeView’s Collapse and Expand events to set a Boolean variable that indicates your procedure shouldn’t run. EG:

Dim bNodeImageClicked As Boolean

Private Sub MyTreeView_Collapse(ByVal Node As MSComctlLib.Node)
    bNodeImageClicked = True
End Sub

Private Sub MyTreeView_Expand(ByVal Node As MSComctlLib.Node)
    bNodeImageClicked = True
End Sub

Private Sub MyTreeView_Click()
    If bNodeImageClicked Then
        bNodeImageClicked = False
        Exit Sub
    End If

    'Your code...
End Sub