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How to disable the sub menuitem of the main menu  in an SDI application?

Posted on 2002-05-06
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Last Modified: 2013-11-20
How to disable the sub menuitem of the main menu  in an SDI application? I tried with the following code its not working.

     CMenu* mmenu = GetMenu();
     CMenu* submenu = mmenu->GetSubMenu(0);
     submenu->EnableMenuItem(ID_VIEW_ITEM2, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);

Can anyone help me with some explanation.
Thanks in Advance.
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Question by:bkkabi
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7 Comments
 
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Accepted Solution

by:
VinExpert earned 25 total points
ID: 6991156
Hi,

Instead try the same code with MF_BYPOSITION. It should work. I had faced this problem and fixed it in that way.

Like :

CMenu* mmenu = AfxGetMainWnd()->GetMenu();
CMenu* submenu = mmenu->GetSubMenu(0);
submenu->EnableMenuItem(1, MF_BYPOSITION | MF_DISABLED);

Here, the sub menu item whoes position is 1 will be disabled.

Try it out.
VinExpert
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Assisted Solution

by:Crius
Crius earned 25 total points
ID: 6991217
You have to make sure you are referencing the proper submenu. In your example:

    CMenu* mmenu = GetMenu();
    CMenu* submenu = mmenu->GetSubMenu(0);
    submenu->EnableMenuItem(ID_VIEW_ITEM2, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);

I noticed you are referring to GetSubMenu(0). In default MFC applications, this refers to the File menu. However, I noticed you are trying to disable the menu ID "ID_VIEW_ITEM2" which looks like a View menu item. The default View menu item is usually the 3rd or so menu item.

Try:

    CMenu* mmenu = GetMenu();
    CMenu* submenu = mmenu->GetSubMenu(2);
    submenu->EnableMenuItem(ID_VIEW_ITEM2, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);

Since we expect the View menu to be at GetSubMenu(2)...
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Expert Comment

by:mblat
ID: 6991379
I think you may have to disable m_bAutoMenuEnable  member of CFrameWnd.  Otherwise enabling/disabling menu items handles  automatically

from MSDN:

CMainFrame::CMainFrame()
{
   // Set to FALSE so no ON_UPDATE_COMMAND_UI or
   // ON_COMMAND handlers are needed, and
   // CMenu::EnableMenuItem() will work as expected.
   m_bAutoMenuEnable  = FALSE;
}
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LVL 3

Expert Comment

by:Crius
ID: 6991737
That could cause a few problems, but works better than manually doing it.

The best way to do it is to handle the On_Update messages sent for than menu item.

     ON_UPDATE_COMMAND_UI(ID_VIEW_ITEM2, OnUpdateViewItem2)


void CMyClass::OnUpdateViewItem2(CCmdUI* pCmdUI)
{
    //You can replace false with a variable to keep track of whether you want the menu enabled or not
    pCmdUI->Enable(false);
}
0
 
LVL 8

Expert Comment

by:VinExpert
ID: 7012049
Hi,

U got ur prob solved? If u have any questions, u may ask them here.

VinExpert
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