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();
        }
    }
}



Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • On-Demand Webcast APIs can be a great source of competitive advantage. The practice of exposing backend services as APIs has become pervasive, however their use varies widely across companies and industries. Some companies leverage APIs to create internal, operational and development efficiencies, while others use them to drive ancillary revenue channels. Many companies successfully support both public and private programs from the same API by varying levels of access to different constituents. Nearly all …

  • On-demand Event Event Date: December 18, 2014 The Internet of Things (IoT) incorporates physical devices into business processes using predictive analytics. While it relies heavily on existing Internet technologies, it differs by including physical devices, specialized protocols, physical analytics, and a unique partner network. To capture the real business value of IoT, the industry must move beyond customized projects to general patterns and platforms. Check out this webcast and join industry experts as …

Most Popular Programming Stories

More for Developers

RSS Feeds