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API: Change the ForeColor and Bold properties of a selected node  in Treeview

Author(s)
Dev Ashish

  Microsoft's Treeview control does not support highlighting the currently selected Node's text.  While you can highlight a node by running code in the Node's Click event, the previously highlighted Node will not clear.

  Using the SendMessage API, it's possible to retrieve the current settings of a Node, and by iterating over all the nodes, if the Bold property is set to be true for a Node, we can force the Node to reset and repaint normally.

  To view this sample, place a Treeview (Version 6) on a form, and name it tvwTest.  Copy the following code in the form's class module.

' ******** Code Start ********
'This code was originally written by Dev Ashish.
'It is not to be altered or distributed,
'except as part of an application.
'You are free to use it in any application,
'provided the copyright notice is left unchanged.
'
'Code Courtesy of
'Dev Ashish
'
Private Type TV_ITEM
    mask As Long
    hItem As Long
    state As Long
    stateMask As Long
    pszText As String
    cchTextMax As Long
    iImage As Long
    iSelectedImage As Long
    cChildren As Long
    lParam As Long
End Type
 
Private Declare Function apiSendMessage _
    Lib "user32" Alias "SendMessageA" _
  (ByVal hWnd As Long, _
  ByVal wMsg As Long, _
  ByVal wParam As Long, _
  lParam As Any) _
  As Long
 
Private Const TVIS_BOLD  As Long = &H10
Private Const TV_FIRST As Long = &H1100
Private Const TVM_GETITEM As Long = (TV_FIRST + 12)
Private Const TVIF_HANDLE = &H10
Private Const TVGN_ROOT = &H0
Private Const TVIF_CHILDREN = &H40
Private Const TVM_GETNEXTITEM = (TV_FIRST + 10)
Private Const TVGN_CHILD = &H4
Private Const TVIF_STATE = &H8
Private Const TVM_SETITEM = (TV_FIRST + 13)
Private Const TVGN_NEXT = &H1
Private Const TVGN_CARET = &H9
Private mobjLastNode As Node
Private mlngBackColor As Long
 
Private Sub Form_Load()
Dim objNode As Node
Dim i As Integer
    For i = 1 To 10
        Set objNode = tvwTest.Nodes.Add(, , "r" & i, "ANode" & i)
    Next
End Sub
 
Private Sub sResetItems(hWnd As Long, hItem As Long)
Dim tvi As TV_ITEM
Dim hItemChild As Long
Dim objNode As Node
 
    If hItem = 0 Then
        hItem = apiSendMessage(hWnd, _
                            TVM_GETNEXTITEM, _
                            TVGN_ROOT, _
                            ByVal 0&)
    End If
    If Not mobjLastNode Is Nothing Then
        With mobjLastNode
            .ForeColor = vbBlack
            .BackColor = mlngBackColor
        End With
    End If
    Do While Not hItem = 0
        tvi.hItem = hItem
        tvi.mask = TVIF_CHILDREN Or TVIF_STATE
        tvi.stateMask = TVIS_BOLD
        Call apiSendMessage(hWnd, _
                    TVM_GETITEM, _
                    0, _
                    tvi)
        If tvi.state And TVIS_BOLD = TVIS_BOLD Then
            tvi.state = tvi.state And Not TVIS_BOLD
            Call apiSendMessage( _
                hWnd, _
                TVM_SETITEM, _
                0, _
                tvi)
        End If
 
        If (tvi.cChildren) Then
            hItemChild = apiSendMessage( _
                        hWnd, _
                        TVM_GETNEXTITEM, _
                        TVGN_CHILD, _
                        ByVal hItem)
            Call sResetItems(hWnd, hItemChild)
        End If
        hItem = apiSendMessage(hWnd, _
                                    TVM_GETNEXTITEM, _
                                    TVGN_NEXT, _
                                    ByVal hItem)
    Loop
End Sub
 
Private Sub tvwTest_NodeClick(ByVal Node As Object)
    Call sResetItems(Me.tvwTest.hWnd, 0)
    With Node
        .Bold = True
        .ForeColor = vbBlue
        mlngBackColor = .BackColor
        .BackColor = vbYellow
    End With
    Set mobjLastNode = Node
End Sub
' ******** Code End *********

1998-2010, Dev Ashish & Arvin Meyer, All rights reserved. Optimized for Microsoft Internet Explorer