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Simple CMenu question

Posted on 1998-05-28
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Last Modified: 2013-11-20
Can anyone tell me why this code is not shading out the menu choice I want it to?

CMenu* TmpMenuPtr;
      
      if(_cAliasButton)
              _cAliasButton->EnableWindow(FALSE);
      TmpMenuPtr = GetMenu();
      if(TmpMenuPtr)
              TmpMenuPtr->EnableMenuItem(ID_ALIAS, MF_DISABLED | MF_GRAYED | MF_BYCOMMAND);
_cAliasButton is a button in the window, and I'm trying to gray the menu choice when I gray the button.
Thanks.
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Question by:Beatachon
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LVL 11

Accepted Solution

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mikeblas earned 50 total points
ID: 1315680
And this is in an MFC application?  If so, the reason the menu isn't going gray is that MFC uses OnUpdateCommandUI() notifications to decide the state of UI elements like menus. You should move your code to an OnUpdateCommandUI() handler for your menu item, and make your call against the pCmdUI object your handler is passed instead of calling GetMenu().

.B ekiM
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Author Comment

by:Beatachon
ID: 1315681
Do I have to derive my own class from CControlBar, or can I catch this message in my window's message map?
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LVL 11

Expert Comment

by:mikeblas
ID: 1315682
How does this involve CControlBar?

.B ekiM
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Author Comment

by:Beatachon
ID: 1315683
I have since solved the problem, but in a simpler way. But in your method, where do I intercept that message? And which message am I looking for?
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LVL 11

Expert Comment

by:mikeblas
ID: 1315684
Have a look at ClassWizard.  Select the class representing the window that holds your menu. Find the command ID for the menu item and select it in the left-hand list box, and look for the UPDATE_COMMAND_UI event in the right-hand list box. It'll add an OnUpdateCmdUI() handler to your class.

All MFC applicaitons are normally written this way, as it's almost always far more convenient than remembering to call EnableMenuItem() in all the right places everywhere command availability state changes.

.B ekiM

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