Main Menu and context Menu differences.

Reza Razavipour -- biles.com!reza_r@jabberwock.biles.com
Wednesday, April 24, 1996

NT 3.5.1 Patch 3 and VC 4.1

I have an SDI app with obviously a menu bar. All is well so far, menu entries 
become enabled and disabled correctly. Then I started adding context menu 
popups, these menus do a subset of the main menu commands. I was thinking, I 
dont have to code any more if I use the main menu IDs for the corresponding 
context menu entries. But, the context menu entries are always enabled.

Am I missing something. Do I have to duplicate the code for the new menu 
entries?

Any hint is appreciated.

Reza

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Klaus Guetter -- 100031.1400@CompuServe.COM
Friday, April 26, 1996

[Mini-digest: 3 responses]

Reza,

The problem is that TrackPopupMenu does not send a WM_INITPOPUPMENU, so the
UPDATE_COMMAND_UI handlers are not invoked.
The simplest solutions would be to explicitly send the message befor calling
TrackPopupMenu. One caveat: MFC's WM_INITMENUPOUPMENU handler implicitly frees
the temporary handle maps (can be prevented by AfxLockTempMaps).

Code example:

	CMenu* pPopupMenu = ...;

	AfxLockTempMaps();

	AfxGetMainWnd()->SendMessage(WM_INITMENUPOPUP,
(WPARAM)pPopupMenu->m_hMenu, 0);

	pPopupMenu->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x,
point.y, AfxGetMainWnd());

	AfxUnlockTempMaps();


- Klaus

-----From: vpalani@harbinger.net (Venkat Palani)

Hi Reza,

You said that conext menu items are always enabled, but are these menu =
commands handled when selected from context menu?. Enabling or disabling =
menu items depends on which CWnd object handles these commands. Did you =
pass the correct CWnd object in TrackPopupMenu(...) something like this

void CMainFrame::OnContextMenu(CWnd* pWnd, CPoint point)=20
{
	if ( m_pContextMenu ) {
		CMenu *pSubMenu =3D m_pContextMenu->GetSubMenu(0);
		if ( pSubMenu ) {
pSubMenu->TrackPopupMenu(TPM_LEFTALIGN|TPM_RIGHTBUTTON,point.x, =
point.y,this);
		}
	}
}

It also depends on where you have put the handler for WM_CONTEXTMENU.
May be you can get some hint from this.

Venkat Palani
Software Engineer
Harbinger Net Services
Atlanta.
-----From: Ken Freeman 

Make sure the parent of the popup menu is the frame and not the view.

Ken

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Niels Ull Jacobsen -- nuj@kruger.dk
Wednesday, May 01, 1996

[Mini-digest: 3 responses]

I think you should be able to just send a WM_INITMENUPOPUP to your view=20
with the appropriate parameters. This should take care of enabling/disabling
items.

Haven't tried it myself, though.=20

Otherwise, you may consider duplicating the code from
CFrameWnd::OnInitMenuPopup.

Niels Ull Jacobsen, Kr=FCger A/S (nuj@kruger.dk)
Everything stated herein is THE OFFICIAL POLICY of the entire Kruger group
and should be taken as legally binding in every respect. Pigs will grow
wings and fly.

-----From: Simon Wilson 

Ensure that your TrackPopuopMenu call uses the AfxGetMainWnd call to
obtain the receiving window for commands from the popup menu. I
discovered this initially by accident, but after considering the facts
it makes sense. If you study the MFC message loop it originates in the
main frame window (be it SDI or MDI) and these class pass the messages
through the correct command handler classes for the application. (I've
had cause to modify this in order to include custom messages that need
to be passed to the document, normally only WM_COMMAND messages are
sent to the document).

Hope this helps
Simon Wilson
===========================================================
Technisoft Ltd.            Solutions for tommorrow, today!
Macclesfield	           Windows, OLE, OOA, OOD, OOP
England                    simon@techsoft.demon.co.uk
+44 1625 434533
===========================================================
-----From: pmoss@bbn.com (Peter Moss)

I'll add this tidbit to the issue of enabling/graying context menu items.  I 
had the luxury of knowing when I load the menu in response to the 
WM_CONTEXT_MENU msg which items should be enabled/grayed.  So this was my 
solution:

void CVarListBar::OnContextMenu(CWnd* pWnd, CPoint point) 
{
 // TODO: Add your message handler code here

 TRACE0("CVarListBar::OnContextMenu Pop up Var context menu now\n");

 CMenu menu;
 if (!menu.LoadMenu(IDR_VARPOPUP_MENU))
  return;
  
 CMenu* pPopup = menu.GetSubMenu(0);
 ASSERT(pPopup);

 // Determine what state to put the item "Add To Variable List"
 UINT nMenuState = (m_pVarPropSheet == NULL) ? MF_GRAYED : MF_ENABLED;
 pPopup->EnableMenuItem(ID_VARIABLEPOPUP_ADDTOVARIABLELIST, nMenuState);
 
 // Pop up the menu and process msgs
 // NB: this Cwnd will handle the message processing for the popup
 BOOL bStatus = pPopup->TrackPopupMenu(TPM_LEFTALIGN | TPM_LEFTBUTTON | 
TPM_RIGHTBUTTON, 
  point.x, point.y, this);  
 ASSERT(bStatus);

 return;
}

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