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Disableing menuitems on the fly

Posted on 1998-09-08
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Last Modified: 2013-11-20
Dear Experts,
How do you make a menu item into a variable?
And how do you disable the menu item while the program is running.
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Question by:ramsay
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12 Comments
 
LVL 1

Expert Comment

by:Bridge
ID: 1321885
CMenu* pMenu = m_pMainWnd->GetMenu();
pMenu->EnableMenuItem( ... )
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Author Comment

by:ramsay
ID: 1321886
I have written a program that accepts a double click and is then supposed to disable a menu item.. but the code you gave me produces an assertion error..

any further suggestions..
here is the code below.



void CSCVisTestView::OnLButtonDblClk(UINT nFlags, CPoint point)
{
   
   CMenu* pMenu = GetMenu();
   pMenu->EnableMenuItem(ID_FILE_NEW,MF_GRAYED)
   
      CScrollView::OnLButtonDblClk(nFlags, point);
}

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LVL 1

Expert Comment

by:Bridge
ID: 1321887
Just looking at you code GetMenu probably returns NULL as the menu is associated with the frame. Put ASSERT(pMenu) on the next line to find out.
Try CMenu* pMenu = GetParentFrame()->GetMenu();
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Expert Comment

by:Bridge
ID: 1321888
Ignor what I've said. Talking bollocks
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Author Comment

by:ramsay
ID: 1321889
It worked tho.. ish only for the top items.. not the sub menus.
code so far is:

CMenu* pMenu = GetParentFrame()->GetMenu();
pMenu->EnableMenuItem(ID_SMARTCARD_START,MF_GRAYED);
GetParentFrame()->DrawMenuBar();
 
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Author Comment

by:ramsay
ID: 1321890
it didnt work for the ID_FILE_NEW tho.

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Expert Comment

by:Bridge
ID: 1321891
CMenu* pMenu = GetMenu();
CMenu* pSubMenu = GetSubMenu(0);
pSubMenu->EnableMenuItem(ID_FILE_NEW,MF_GRAYED)
0
 
LVL 1

Author Comment

by:ramsay
ID: 1321892
I used this code.. but it didnt work.. No errors. but the new button wasnt greyed out..
(incase your wondering the ID_SMARTCARD_START) was a direct link of the menu bar and i was greyed out with the previous code)



   CMenu* pMenu =  GetParentFrame()->GetMenu();
   CMenu* pSubMenu = pMenu->GetSubMenu(0);
   pSubMenu->EnableMenuItem(ID_FILE_NEW,MF_GRAYED);
   GetParentFrame()->DrawMenuBar();

0
 
LVL 1

Author Comment

by:ramsay
ID: 1321893
I used this code.. but it didnt work.. No errors. but the new button wasnt greyed out..
(incase your wondering the ID_SMARTCARD_START) was a direct link of the menu bar and i was greyed out with the previous code)



   CMenu* pMenu =  GetParentFrame()->GetMenu();
   CMenu* pSubMenu = pMenu->GetSubMenu(0);
   pSubMenu->EnableMenuItem(ID_FILE_NEW,MF_GRAYED);
   GetParentFrame()->DrawMenuBar();

0
 
LVL 1

Author Comment

by:ramsay
ID: 1321894
Auto grade is soon.
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Accepted Solution

by:
prasanth earned 50 total points
ID: 1321895
I recommend you use the ON_UPDATE_COMMAND_UI MFC macro to do this. Select the view in ClassWizard, select the menu item (ID_FILE_NEW or whatever), and create a handle for ON_UPDATE_COMMAND_UI.

In your doubleclick handler function, keep the disbaled status in a BOOL variable.
Then in the ON_UPDATE_COMMAND_UI handler function you can simply call EnableItem with true or false depending on the state of the BOOL variable.
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Author Comment

by:ramsay
ID: 1321896
Great Worked like a charm!
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