Re: Disable a Menu Item

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 28 Nov 2007 14:18:09 -0500

Message-ID:

<e#KHHOfMIHA.820@TK2MSFTNGP06.phx.gbl>

"Hoop" <jcollett@oshtruck.com> wrote in message
news:b88588cb-870a-43f0-bbf4-ccf458d713f8@r60g2000hsc.googlegroups.com...

Hi,
For this MFC app that I am maintaining there is a menu item that I
would like to disabled, grey-out, at runtime if a certian condition is
met. From reading previous posts on similar questions I have tried,

CMenu *pMenu = GetMenu();
   pMenu->EnableMenuItem(ID_SEARCH_TRUCK_INFO, MF_GRAYED |
MF_BYCOMMAND);

This compiles and runs but does not do anything.

In another post I came across it was suggested to do the below. How is
the code below actually used? Called?

void CMainFrame::OnUpdateMenuItem1(CCmdUI* pCmdUI)
{
   /*
   bool bEnable = ... ; true if it need to enable menu item
                        or false othewise.
   bool bCheck = ... ;
   */

   // ...

   pCmdUI->Enable(bEnable); // if needed
   pCmdUI->SetCheck(bCheck); // if needed
   pCmdUI->SetText("Text"); // if needed
}

Thanks
Jeff

Your second example, OnUpdate...., is a feature of the MFC document/view
architecture framework. The OnUpdate... functions are called just before
the menu is displayed, and/or during idle time. Use this approach if you
are using doc/view, because it overrides anything you try and do with CMenu
functions.

--
Scott McPhillips [VC++ MVP]