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Intercept mouse_down event over DataGridView?

Posted on 2006-10-24
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Last Modified: 2007-12-19
I've drawn a square (in the DGV_Paint sub) on top of a DataGridView control and when I click on it I don't want the underlying DataGridView to see the click event. Ideally there would be an e.handled property for mouse_down but there isn't. What I get is a cell_changed event in the DataGridView control which is causing me problems. There are some rather ugly ways around this but I am looking for something prettier.
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Question by:tmostad
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Mike Tomlinson earned 500 total points
ID: 17799727
Try either Inheriting from DataGridView or using the NativeWindow() class:

Public Class TestForm

    Private mdgv As MyDataGridView

    Private Sub TestForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        mdgv = New MyDataGridView(Me.DataGridView1)
    End Sub

    Private Class MyDataGridView
        Inherits NativeWindow

        Private dgv As DataGridView
        Private Const WM_LBUTTONDOWN As Integer = &H201

        Public Sub New(ByVal dgv As DataGridView)
            If Not (dgv Is Nothing) Then
                Me.dgv = dgv
                Me.AssignHandle(dgv.Handle)
            End If
        End Sub

        Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
            Select Case m.Msg
                Case WM_LBUTTONDOWN
                    Debug.Print("WM_LBUTTONDOWN")
                    ' do something in here and call "exit sub" to suppress the msg if necessary...
                    Exit Sub

            End Select

            MyBase.WndProc(m)
        End Sub

    End Class

End Class
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Expert Comment

by:newyuppie
ID: 17799752
there is no cellchanged event in datagridview, what do you mean?

in case this helps,
Mouse events occur in the following order:

MouseEnter

MouseMove

MouseHover / MouseDown / MouseWheel

MouseUp

MouseLeave

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Author Comment

by:tmostad
ID: 17799819
Sorry, I meant CurrentCellChanged event. I used that event to do stuff when the user actually wants to change cells not when the square above the DGV is clicked.
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Expert Comment

by:almondmitchell
ID: 17826065
Private Sub DataGrid1_CurrentCellChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DataGrid1.CurrentCellChanged
        If DataGrid1.MouseButtons = MouseButtons.Left Then
            MsgBox("left mouse button pressed")
        End If
End sub
       
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