BUG: CFormView Loses the Control's Focus When Restored (224928)

RESOLUTION

1. Define a message called WM_SAVEFOCUS in the Resource.h file:

   #define WM_SAVEFOCUS          WM_APP+1
   					

2. Add a message handler for this user-defined message. In the class definition of your CMyFormView class, add:

   afx_msg LRESULT OnSaveFocus(WPARAM wParam, LPARAM lParam);
   						

   In the .cpp file of CMyFormView, add the message map macro:

   ON_MESSAGE(WM_SAVEFOCUS, OnSaveFocus)
   						

   Add the handler function:

   LRESULT CMyFormView::OnSaveFocus(WPARAM wParam, LPARAM lParam)
   {
   	CFormView::SaveFocusControl();
   
   	return (LRESULT)0;
   }
   					

3. In the class definition of CMainFrame, add:
   

   afx_msg void OnSysCommand( UINT nID, LPARAM lParam );
   						

   In the .cpp file, add the OnSysCommand message map macro:

   ON_WM_SYSCOMMAND()
   						

   Override OnSysCommand of the frame window class that you are using for the formview, and send the WM_SAVEFOCUS message when it is about to minimize. The code should resemble the following:

   void CMainFrame::OnSysCommand(UINT nID, LPARAM lParam)
   {
           if ((nID & 0xfff0) == SC_MINIMIZE)
                   GetActiveView()->SendMessage(WM_SAVEFOCUS);
   
           CFrameWnd::OnSysCommand(nID,lParam);
   }