How can i modify the context menu of a CEdit control?

Question

Before windows7 the solution was easy. Just add your own menu and write your own "Undo,Redo,Cut,Copy,Paste,Delete,Select All" menu items. But now this is not possible anymore because the menu has became really complex with the unicode and input message stuff.

Answer 1

You need to subclass the edit control then use a hook, following is an example code:

LRESULT CALLBACK EditSubclassProc(HWND hWndEdit, UINT Msg, WPARAM wParam, LPARAM lParam, UINT_PTR uIDSubclass, DWORD_PTR dwRefData)
{
    LRESULT ret{};

    switch (Msg)
    {
    case WM_CONTEXTMENU:        
    {
        HWINEVENTHOOK hWinEventHook{ SetWinEventHook(EVENT_SYSTEM_MENUPOPUPSTART, EVENT_SYSTEM_MENUPOPUPSTART, NULL,
            [](HWINEVENTHOOK hWinEventHook, DWORD Event, HWND hWnd, LONG idObject, LONG idChild, DWORD idEventThread, DWORD dwmsEventTime)
            {
                if (idObject == OBJID_CLIENT && idChild == CHILDID_SELF)
                {
                    HMENU hMenuContextEdit{ (HMENU)SendMessage(hWnd, MN_GETHMENU, NULL, NULL) };

                    // Do what you want to do
                }
            },
            GetCurrentProcessId(), GetCurrentThreadId(), WINEVENT_OUTOFCONTEXT) };

        ret = DefSubclassProc(hWndEditMessage, Msg, wParam, lParam);

        UnhookWinEvent(hWinEventHook);
    }
    break;
    default:
        {
            ret = DefSubclassProc(hWndEdit, Msg, wParam, lParam);
        }
        break;
    }

    return ret;
}

Answer 2

Okay i found how to do it

static bool is_first_time;

case WM_CONTEXTMENU: {
   is_first_time = true;
   original_window_proc(message,wparam,lparam);
   break;

case WM_ENTERIDLE:
    if (wparam == MSGF_MENU) {
        if (is_first_time) {
            is_first_time = false; 
            MENUBARINFO mbi;
            memset(&mbi, 0, sizeof(MENUBARINFO));
            mbi.cbSize = sizeof(MENUBARINFO);
            GetMenuBarInfo((HWND)lparam, OBJID_CLIENT, 0, &mbi);
            if (::IsMenu((HMENU)mbi.hMenu)) {
               .... add your menu items here
            }
        }
    }

Unfortunately this does not work because the code uses TrackPopupMenu with the TPM_RETURNCMD and TPM_NONOTIFY flags. So you can add new menu items but there is no way to handle the commands. Bad Microsoft, very bad design.