The following contains a method for putting MRU’s on a separate submenu.
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.
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.
The update function seems to be called under various circumstances.
- m_pMenu != 0 && m_pSubMenu != 0 — popup menu opened up but not the submenu
Don’t do anything - m_pMenu != 0 && m_pSubMenu == 0 — Opening the submenu
Fix up then menu - m_pMenu == 0 && m_pSubMenu == 0 — We’ve clicked on menu
Don’t do anything
//////////////////////////////////////////////////////////////////////
// SubmenuMRU.h
//
#ifndef _SUBMENUMRU_H_ #define _SUBMENUMRU_H_ class SubmenuMRU { public: static void Handle_OnUpdateFileMruFile1(CCmdUI* pCmdUI, CRecentFileList* pRecentFileList); }; #endif
//////////////////////////////////////////////////////////////////////
// SubmenuMRU.cpp
//
#include#include #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--; } } }
//////////////////////////////////////////////////////////////////////
// Snippet from test program’s MenuTest.rc
//
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
//////////////////////////////////////////////////////////////////////
// Snippet from test program’s MenuTest.cpp
//
#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); }