Adding a Customozied ‘More Windows…’ Dialog to an MDI Application

CodeGuru content and product recommendations are editorially independent. We may make money when you click on links to our partners. Learn More.

To add a customized windows dialog to the windows
menu, you just have to take only two following steps in the
mainframe class…

  • Override InitPopupMenu and replace it with the following code :
  • #define DEFAULT_NUMBER_OF_MDIS 9
    
    void CMainFrame::OnInitMenuPopup(CMenu* pPopupMenu,
                                     UINT nIndex,
                                     BOOL bSysMenu )
    {
     CMDIFrameWnd::OnInitMenuPopup(pPopupMenu, nIndex, bSysMenu);
    
     // If the number of active windows is zero, the window submenu 
     // probably does'nt esists. If you have the window submenu present
     // even in zero child windows, remove this code.
    
     int nCount = 0;
     CWnd * pWnd = GetWindow (GW_CHILD);
     ASSERT (pWnd);
     pWnd = pWnd->GetWindow (GW_CHILD);
     while (pWnd)
     {
      nCount++;
      pWnd = pWnd->GetWindow (GW_HWNDNEXT);
     }
    
     // The count is zero. exit.
     if ( nCount == 0 )
      return;
    
     // If it's a system menu, we don't need to handle that...
     if ( !bSysMenu )
     {
      // The default handler places the "more windows" command in the 
      // submenu which contains IDs between AFX_IDM_FIRST_MDICHILD and 
      // AFX_IDM_LAST_MDICHILD, so check the popup for occurence of
      // AFX_IDM_FIRST_MDICHILD.
    
      int nLength = pPopupMenu->GetMenuItemCount();
      for ( int i = 0; i < nLength; i++ )
      {
       if ( pPopupMenu->GetMenuItemID( i ) == AFX_IDM_FIRST_MDICHILD )
       {
        // Found. If the last item is already the "more windows"
        // command than remove it.
        if ( pPopupMenu->GetMenuItemID( nLength - 1 ) ==
        AFX_IDM_FIRST_MDICHILD + DEFAULT_NUMBER_OF_MDIS )
        {
         pPopupMenu->DeleteMenu( nLength - 1, MF_BYPOSITION );
        }
    
        // Add our own window command.
        // Note : The ID must be - ( AFX_IDM_FIRST_MDICHILD +  
        // ( total number of entries in window list supported ) ). 
        // This saves us to make any default handler for the  
        // command, as the default procedure itself 
        // handles the command and sends it to the mainframe class.
        pPopupMenu->AppendMenu(MF_ENABLED|MF_STRING,
                               AFX_IDM_FIRST_MDICHILD + DEFAULT_NUMBER_OF_MDIS,
                               "&Windows..." );
    
        // Done the processing.
        return;
       }
      }
     }
    }
    
  • Override OnCommand and replace it with the following code:
  • BOOL CMainFrame::OnCommand(WPARAM wParam, LPARAM lParam)
    {
     // If the command is "more windows" command call our 
     // own customized dialog
     if ( wParam == AFX_IDM_FIRST_MDICHILD + 9 )
     {
      // Replace CWindowDlg with your own class
      CWindowDlg dlgWindowDlg;
      dlgWindowDlg.DoModal();
    
      // OK. We handled the command so return true, 
      // as we don't want the default handler to 
      // handle this command too.
      return TRUE;
     }
    
     return CMDIFrameWnd::OnCommand(wParam, lParam);
    }
    

Downloads

Download demo project – 22 Kb

More by Author

Get the Free Newsletter!

Subscribe to Developer Insider for top news, trends & analysis

Must Read