How to Create a Minimized/Maximized MDI Child Window

WINDOWS             | WINDOWS NT

The information in this article applies to:

• The Microsoft Foundation Classes (MFC) included with:

      - Microsoft Visual C++, 32-bit Edition, versions 1.0, 2.0, 2.1,
        2.2, 4.0
      - Microsoft Visual C++ for Windows, versions 1.0, 1.5, 1.51, 1.52
  

SUMMARY

To create an initially minimized or maximized document in an MDI application, derive a class from CMDIChildWnd and override ActivateFrame(). In the ActivateFrame() member function, call the ActivateFrame() function in the base class, and pass SW_SHOWMINIMIZED or SW_SHOWMAXIMIZED as the parameter.

MORE INFORMATION

If you're using a version of Visual C++ earlier than 4.0, it is necessary to derive a class from CMDIChildWnd and substitute the new class name in the CMultiDocTemplate used in your CWinApp-derived InitInstance() function. To do so, use ClassWizard to add a class called CChildFrame derived from CMDIChildWnd. Include the header file in your application's .cpp file. Then change the line indicated below in your InitInstance() function:

    CMultiDocTemplate* pDocTemplate;
    pDocTemplate = new CMultiDocTemplate(
        IDR_MDIAPPTYPE,
        RUNTIME_CLASS(CMDIAppDoc),
        RUNTIME_CLASS(CChildFrame), // change CMDIChildWnd to CChildFrame
        RUNTIME_CLASS(CMDIAppView));
    AddDocTemplate(pDocTemplate);

In the CChildFrame class, override the ActivateFrame() member function as follows:

void CChildFrame::ActivateFrame(int nCmdShow)

    if (nCmdShow == -1)
        nCmdShow = SW_SHOWMAXIMIZED;

    CMDIChildWnd::ActivateFrame(nCmdShow);