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How to disable mouse scrolling while ContextMenuStrip is open in vb .net?

What I have tried:

I have no idea how I can achieve this
Updated 1-Jan-22 9:42am

1 solution


ContextMenuStrip does not proved scroll event trapping, not tried this but you may be able to use IMessageFilter.PreFilterMessage and trap mouse wheel events when the ContextMenuStrip is active, there may be other conditions such as page up and page down you have to trap as well to completely block scrolling.

Private Const WM_MOUSEWHEEL As Integer = &H20A

Private ContextActiveFlag as Boolean = False

    Public Function PreFilterMessage(ByRef m As System.Windows.Forms.Message) As Boolean Implements IMessageFilter.PreFilterMessage
        ' Manage Time Value For Idle Timeout
        Select Case m.Msg
            Case WM_MOUSEWHEEL
            ' If Context Menu Flag True Return True on Mouse Wheel event to ignore
            If ContextActiveFlag = True Then
               Return True
            End If
        End Select
        ' not handling this event so return false
        Return False
    End Function

On the MenuStrip control trap the Opening or Opened to toggle the ContextActiveFlag to True and the Closing or Closed events to toggle the ContextActiveFlag to False.
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Member 12617947 2-Jan-22 3:54am    
HI,dear Michael_Davies Thank you for your help, this is exactly what I wanted

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