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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Jan 29, 2000

Show a custom popup menu for a TextBox without subclassing

Elsewhere in the TipBank we show how you can display a custom popup menu on a TextBox control by subclassing the WM_CONTEXTMENU message that Windows sends the control when the user right-clicks on it. If you don't like to resort to subclassing for such an easy job, you can use the following tip, taken from Microsoft Knowledge Base:

Private Declare Function LockWindowUpdate Lib "user32" (ByVal hwndLock As Long) _
    As Long

Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, _
    Y As Single)
    If Button = vbRightButton Then
        ' don't let the control display as "grayed"
        LockWindowUpdate Text1.hWnd
        ' disable the textbox, so that it can't react to mouse click
        Text1.Enabled = False
        ' show your custom menu       
        PopupMenu mnuFile
        ' re-enable the control
        Text1.Enabled = True
        ' stop freezing the update
        LockWindowUpdate 0&
    End If
End Sub
Even better, it turns out that you don't even need the LockWindowUpdate API function to avoid the TextBox control enter the "grayed" state, provided that you re-arrange the above statements and ensure that the TextBox control misses the opportunity to display the default Edit menu:

Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, _
    Y As Single)
    If Button = vbRightButton Then
        ' disable the textbox
        Text1.Enabled = False
        ' (this DoEvents seems to be optional)
        DoEvents
        ' re-enable the control, so that it doesn't appear as grayed
        Text1.Enabled = True
        ' show your custom menu       
        PopupMenu mnuFile
    End If
End Sub
Francesco Balena
 
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