How to detect a mouse click on a Winform titlebar

[TheAphextwin]

I assume this needs to be an Win API call but I can't for the life of me find this anywhere, I am developing in VB.NET 2003.

 

I appreciate an advice or pointers you can offer, thanks.

[pelikan]

you need to intercept one of the WM_NC.. windows messages sent to the form window.

 

eg. WM_NCLBUTTONDOWN

the 'hit-test' code for the message is HTCAPTION

 

to get the values for these constants (API-Viewer? windows.h? if you ever had VS 6)

 

I'm new to C# so not sure how to hook the WindowProc of the form -

maybe use the NativeWindow class. :cool:

[PlausiblyDamp]

Paste this into the form in question - should give you a good idea of what you need to do.

Private Const WM_NCLBUTTONDOWN As Integer = &HA1
Private Const HTCAPTION As Integer = 2
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)

	If m.Msg = WM_NCLBUTTONDOWN AndAlso m.WParam.ToInt32() = HTCAPTION Then
		MessageBox.Show("hit")
		Return
	End If

	MyBase.WndProc(m)
End Sub