Problems catching WM_NOTIFY

Jonas Yngvesson -- jonas-y@sectra.se
Monday, August 26, 1996


Environment: VC++ 4.0, NT 3.51

Hi!
=20
I am building an application using a small part of the MFC framework. I
have an application class (derived from CWinApp) but no document
templates, documents or views. Instead I have my own top level window
derived directly from CWnd, this window is built and installed as the
m_pMainWnd member by my own code. (I wont go into the reasons for this
architecture, but it has to do with configurability and compatibility
over to UNIX/X).
=20
Anyway, I have built a toolbar in this main window using a CToolBarCtrl
directly and everything works find except for one thing: I cant seem to
catch any WM_NOTIFY messages sent from the toolbar. The result is that I
can't get neither tooltips (need to catch TTN_NEEDTEXT) nor toolbar
configuration (needs TBN_BEGINADJUST etc.) working.
=20
I try to declare the message handlers in my message map of the main
window, for instance like:
=20
BEGIN_MESSAGE_MAP(My_Main_window, CWnd)
  ...
  ON_NOTIFY_RANGE(TTN_NEEDTEXT, TB_BTN_FIRST, TB_BTN_LAST, get_tooltips_t=
ext)
  ON_NOTIFY(TBN_BEGINDRAG, TOOLBAR_ID, tb_button_drag)
  ...
END_MESSAGE_MAP()
=20
(TB_BTN_* are id's assigned by me when adding buttons to the toolbar)
=20
None of these message handlers ever gets called.
=20
If I override CWnd::OnNotify() in my own class I can see that this
function is called as supposed to but the messages are never routed any
further through the message map.=20
=20
I can of course call the message handlers direcly from my own OnNotify()
but it seems to me CWnd::OnNotify should handle it for me.
=20
Am I missing something obvious here, or what's the story?


--Jonas

----
Jonas Yngvesson         SECTRA AB, Teknikringen 1
Phone: +46-13-235222                       S-583 30 Link=F6ping, Sweden
Fax: +46-13-212185                         "The Internet is full - Go Awa=
y!"

---

ppbillc@srv2.sj.ablecom.net
Tuesday, August 27, 1996

[Mini-digest: 3 responses]

Jonas,

You can Try 3  things :

 1) Create a messageMap for the ToolBar and forward to the MainWnd
 2) Implement the virtual function OnUpdateCmdUI for the Toolbar Class
     and Call UpdateDialogContols(..., FALSE); This may be the cause 
     of the messages not getting through.
 3) Get very drunk and forget about the whole thing :)

Bill



    
-----From: "Rommel Songco" 

	The MFC documentation says that when handling the WM_NOTIFY message, an
override will not process the message map unless you call the base class
OnNotify.  

>BEGIN_MESSAGE_MAP(My_Main_window, CWnd)
>  ...
>  ON_NOTIFY_RANGE(TTN_NEEDTEXT, TB_BTN_FIRST, >TB_BTN_LAST,
get_tooltips_text)
>  ON_NOTIFY(TBN_BEGINDRAG, TOOLBAR_ID, tb_button_drag)
>  ...
>END_MESSAGE_MAP()

	What you've done here is trap WM_NOTIFY messages.  
Have you actually provided handler functions and message-map entries for
each of the messages you're interested in?  

Regards,

Rommel Songco
rsongco@spectrasoft.com

-----From: Serge Lalonde 

Hi there!

I think that the parent window is intercepting the command and not passing
it to its children. Try overriding the window's OnCmdMsg() method and call
the OnCmdMsg() method for the toolbar. This should reroute the command to
the toolbar. Example,

BOOL myWindowClass::OnCmdMsg
  (UINT               nID,
   int                nCode,
   void               *pExtra,
   AFX_CMDHANDLERINFO *pHandlerInfo)
{
   if (baseWindowClass::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
      return(TRUE);

   if (m_toolbar.OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
      return(TRUE);

   return(FALSE);
}

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