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How do I subclass in VB6 to capture user left mouse event on the title bar?

Posted on 2010-08-25
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Last Modified: 2012-08-13
I want to capture the event when the user left-clicks on the title bar of a form in VB6....mouse down, mouse click etc. Thanks.....
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Question by:jazjef
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6 Comments
 
LVL 29

Expert Comment

by:nffvrxqgrcfqvvc
ID: 33521441
Begin with your normal subclassing routine but detect the non client area messages these are prefixed with (WM_NC) for example:

Mouse Input Notifications
http://msdn.microsoft.com/en-us/library/ff468877(v=VS.85).aspx 

WM_NCHITTEST
WM_NCLBUTTONDBLCLK
WM_NCLBUTTONDOWN
WM_NCLBUTTONUP
WM_NCMBUTTONDBLCLK
WM_NCMBUTTONDOWN
WM_NCMBUTTONUP
WM_NCMOUSEHOVER
WM_NCMOUSELEAVE
WM_NCMOUSEMOVE
WM_NCRBUTTONDBLCLK
WM_NCRBUTTONDOWN
WM_NCRBUTTONUP
WM_NCXBUTTONDBLCLK
WM_NCXBUTTONDOWN
WM_NCXBUTTONUP
In your WindowProc() method for example it would look something like this:
 

' Inside your WindowProc
Public Function WndProc(ByVal hWnd As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If uMsg = WM_NCLBUTTONDBLCLK Then
 If wParam = HTCAPTION Then
  ' TODO:// Something when double clicked.
 End If
 WndProc = CallWindowProcA(func, hWnd, uMsg, wParam, lParam)
End If
End Function

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Accepted Solution

by:
nffvrxqgrcfqvvc earned 2000 total points
ID: 33521611
There is typo in previous example where the last line should be outside the If block statement. Below you can find a working example for detecting left double click, that will get you started then you can add the other events from the link above.

' Module1.bas

Option Explicit

Private Const WM_NCLBUTTONDBLCLK    As Long = &HA3&
Private Const HTCAPTION             As Long = &H2&
Private Const GWL_WNDPROC           As Long = (-4)

Private Declare Function SetWindowLongA Lib "User32.dll" (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function CallWindowProcA Lib "User32.dll" (ByVal lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

Private hWindow     As Long
Private func        As Long

Public Sub Attatch(ByVal hWnd As Long)
  If hWindow = 0 Then
    hWindow = hWnd
    func = SetWindowLongA(hWindow, GWL_WNDPROC, AddressOf WndProc)
  End If
End Sub

Public Sub Detatch()
  If hWindow <> 0 Then
    Call SetWindowLongA(hWindow, GWL_WNDPROC, func)
    hWindow = 0
  End If
End Sub
 
Public Function WndProc(ByVal hWnd As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If uMsg = WM_NCLBUTTONDBLCLK Then
  If wParam = HTCAPTION Then
  ' TODO:// Something when double clicked.
    Debug.Print "Double Clicked: "; Time
  End If
End If
WndProc = CallWindowProcA(func, hWnd, uMsg, wParam, lParam)
End Function



' Form1
Option Explicit

Private Sub Form_Load()
  Attatch Me.hWnd
End Sub
 
Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
  Detatch
End Sub

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Author Comment

by:jazjef
ID: 33526571
Works great eql44. Thanks for teaching me how to do this. One small question.... is there a specific reason why it closes my development environment when I close the form? It shuts the form and my VB6 down when I click the X on the control box to exit.
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LVL 29

Expert Comment

by:nffvrxqgrcfqvvc
ID: 33526592
Well it shouldn't but if you have an error in the WindowProc(WndProc) it will cause all kinds of problems so I have to ask you did you add/modify the example with some extra code?
 
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LVL 4

Author Comment

by:jazjef
ID: 33526932
:) Yes. I did. But it's working now. Thanks for showing me how this is done eql1044---really helpful and very informative. And thanks for adding in the mouse input notifications.....
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LVL 4

Author Closing Comment

by:jazjef
ID: 33526950
Top-notch solution. Thanks eql1044.
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