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   <TITLE>Menu - Using MRU on submenu</TITLE>
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<FONT COLOR="#AOAO99">Using MRU on submenu<P></FONT></H3></CENTER>

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<H3>

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This article was contributed by <A HREF="mailto:lhaupt@ix.netcom.com">Lewis Haupt</A>. 

<P>The following contains a method for putting MRU's on a separate submenu.

<P>After studying Todd C. Gleason's method for implementing MRU's on a submenu MRU's, 
I ended up taking a slightly different approach.  Namely, a helper function to 
handle the application's OnUpdateFileMruFile1(CCmdUI* pCmdUI) function.

<P>CRecentFileList::UpdateMenu() seems to work OK if there's another item on the 
submenu before the MRU.  So we insert such an item, update the menu, and then
remove the inserted menu.

<P>The update function seems to be called under various circumstances.
<ul>
<li>m_pMenu != 0 && m_pSubMenu != 0 -- popup menu opened up but not the submenu<BR>
	Don't do anything
<li>m_pMenu != 0 && m_pSubMenu == 0 -- Opening the submenu<BR>
	Fix up then menu
<li>m_pMenu == 0 && m_pSubMenu == 0 -- We've clicked on menu<BR>
	Don't do anything
</ul>


<FONT COLOR="#009900">
//////////////////////////////////////////////////////////////////////<BR>
// SubmenuMRU.h<BR>
//<BR>
</FONT>

<PRE><TT><FONT COLOR="#990000">
#ifndef _SUBMENUMRU_H_
#define _SUBMENUMRU_H_

class SubmenuMRU
{
public:
  static void Handle_OnUpdateFileMruFile1(CCmdUI* pCmdUI, CRecentFileList* pRecentFileList);
};

#endif
</FONT></TT></PRE>

<FONT COLOR="#009900">
//////////////////////////////////////////////////////////////////////<BR>
// SubmenuMRU.cpp<BR>
//<BR>
</FONT>

<PRE><TT><FONT COLOR="#990000">
#include <afxwin.h>
#include <afxadv.h>

#include "SubmenuMRU.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

void SubmenuMRU::Handle_OnUpdateFileMruFile1(CCmdUI* pCmdUI, CRecentFileList* pRecentFileList)
{
	if (pRecentFileList == NULL) // no MRU files
		pCmdUI->Enable(FALSE);
	else
    {
        if (pCmdUI->m_pMenu && !pCmdUI->m_pSubMenu) // Only do something if we're the submenu
        {
            // Insert a separator so that CRecentFileList::UpdateMenu() will behave
            pCmdUI->m_pMenu->InsertMenu(0, MF_SEPARATOR | MF_BYPOSITION);
            pCmdUI->m_nIndex++;
            pCmdUI->m_nIndexMax++;

            pRecentFileList->UpdateMenu(pCmdUI); // Update the menu

            // Get rid of the separator we just inerted
            pCmdUI->m_pMenu->DeleteMenu(0, MF_BYPOSITION);
            pCmdUI->m_nIndex--;
            pCmdUI->m_nIndexMax--;
        }
    }
}
</FONT></TT></PRE>


<FONT COLOR="#009900">
//////////////////////////////////////////////////////////////////////<BR>
// Snippet from test program's MenuTest.rc<BR>
//<BR>
</FONT>

<PRE><TT><FONT COLOR="#990000">
IDR_MAINFRAME MENU PRELOAD DISCARDABLE 
BEGIN
    POPUP "&File"
    BEGIN
		...
        POPUP "Recent &Files"
        BEGIN
            MENUITEM "Recent File", ID_FILE_MRU_FILE1, GRAYED
        END
        MENUITEM SEPARATOR
        MENUITEM "E&xit", ID_APP_EXIT
    END
	...
END
</FONT></TT></PRE>

<FONT COLOR="#009900">
//////////////////////////////////////////////////////////////////////<BR>
// Snippet from test program's MenuTest.cpp<BR>
//<BR>
</FONT>

<PRE><TT><FONT COLOR="#990000">
#include "SubmenuMRU.h"

BEGIN_MESSAGE_MAP(CMenuTestApp, CWinApp)
	...
	ON_UPDATE_COMMAND_UI(ID_FILE_MRU_FILE1, OnUpdateFileMruFile1)
END_MESSAGE_MAP()


void CMenuTestApp::OnUpdateFileMruFile1(CCmdUI* pCmdUI) 
{
    // TODO: Add your command update UI handler code here
    SubmenuMRU::Handle_OnUpdateFileMruFile1(pCmdUI, m_pRecentFileList);
}
</FONT></TT></PRE>



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