Merging Two Menus

This function will merge two menues. This can be used for context menus as well as for top level menus. At top level known popup menus will be appended or new popups will be created before <Window> or <Help> (currently untested). The function calles itself recursivley and does not care about consecutive seperators.

void MergeMenu( CMenu* pMenuDestination, CMenu* pMenuAdd, bool bTopLevel /*=false*/ )
{
    // Abstract:
    //      Merges two menus.
    //
    // Parameters:
    //      pMenuDestination    - [in, retval] destination menu handle

    //      pMenuAdd            - [in] menu to merge
    //      bTopLevel           - [in] indicator for special top level behavior
    //
    // Comments:
    //      This function calles itself recursivley. If bTopLevel is set to true,
    //      we append popups at top level or we insert before <Window> or <Help>.

    // get the number menu items in the menus
    int iMenuAddItemCount = pMenuAdd->GetMenuItemCount();
    int iMenuDestItemCount = pMenuDestination->GetMenuItemCount();

    // if there are no items return
    if( iMenuAddItemCount == 0 )
        return;

    // if we are not at top level and the destination menu is not empty
    // -> we append a seperator
    if( !bTopLevel && iMenuDestItemCount > 0 )
        pMenuDestination->AppendMenu( MF_SEPARATOR );

    // iterate through the top level of <pMenuAdd>
    for( int iLoop = 0; iLoop < iMenuAddItemCount; iLoop++ )
    {
        // get the menu string from the add menu
        CString sMenuAddString;
        pMenuAdd->GetMenuString( iLoop, sMenuAddString, MF_BYPOSITION );

        // try to get the submenu of the current menu item
        CMenu* pSubMenu = pMenuAdd->GetSubMenu( iLoop );

        // check if we have a sub menu
        if( !pSubMenu )
        {
            // read the source and append at the destionation

            VERIFY( pMenuDestination->AppendMenu( 
                            pMenuAdd->GetMenuState( iLoop, MF_BYPOSITION ), 
                            pMenuAdd->GetMenuItemID( iLoop ),
                            sMenuAddString ));
        }
        else
        {
            // create or insert a new popup menu item

            // default insert pos is like ap
            int iInsertPosDefault = -1;

            // if we are at top level merge into existing popups rather than
            // creating new ones
            if( bTopLevel )

                // try to find existing popup
                for( int iLoop = 0; iLoop < iMenuDestItemCount; iLoop++ )
                {
                    // get the menu string from the destination menu
                    CString sDest;
                    pMenuDestination->GetMenuString( iLoop, sDest, MF_BYPOSITION );

                    // we got a hit -> merge the two popups
                    if( sMenuAddString == sDest )
                    {
                        // try to get the submenu of the desired destionation menu item
                        CMenu* pSubMenuDest = MenuDestination->GetSubMenu( iLoop );

                        if( pSubMenuDest )
                        {
                            // merge the popup recursivly and continue with for loop
                            MergeMenu( pSubMenuDest, pSubMenu );
                            continue;
                        }
                    }

                    // alternativ insert before <Window> or <Help>
                    if( iInsertPosDefault == -1 && (sDest == "&Window" || sDest == "&Help" ))
                        iInsertPosDefault = iLoop;
                }
            }

            // if the top level search did not find a position append the menu
            if( iInsertPosDefault == -1 )
                iInsertPosDefault = pMenuDestination->GetMenuItemCount();

            // create a new popup and insert before <Window> or <Help>
            CMenu NewPopupMenu;
            VERIFY( NewPopupMenu.CreatePopupMenu() );

            // merge the new popup recursivly
            MergeMenu( &NewPopupMenu, pSubMenu );

            // insert the new popup menu into the destination menu

            VERIFY( pMenuDestination->InsertMenu( 
                            iInsertPosDefault,
                            MF_BYPOSITION | MF_POPUP | MF_ENABLED, 
                            (UINT)NewPopupMenu.GetSafeHmenu(),
                            sMenuAddString ));

            // don't destroy the new menu           
            NewPopupMenu.Detach();
        }
    }
}



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