PRB: Resizing CPropertySheet in OnInitDialog Does Not Work

4.00       | 4.00

The information in this article applies to:

• The Microsoft Foundation Classes (MFC) included with: Microsoft Visual C++, 32-bit Edition, version 4.0

SYMPTOMS

If you create a class derived from CPropertySheet and use ClassWizard to add a handler for OnInitDialog(), the TODO comment will be added before the call to CPropertySheet::OnInitDialog(). If you replace the comment with calls to MoveWindow() or SetWindowPos() to resize the sheet, this will not work. Also, GetWindowRect() or GetClientRect() will not return the correct information if called before OnInitDialog().

This is the code generated by ClassWizard:

   BOOL CMySheet::OnInitDialog()
   {
      // TODO: Add your specialized code here and/or call the base class
      return CPropertySheet::OnInitDialog();
   }

CAUSE

CPropertySheet::OnInitDialog causes the CPropertySheet to resize. Therefore, any call to MoveWindow() or SetWindowPos() has no effect if it comes before CPropertySheet::OnInitDialog().

RESOLUTION

Call CPropertySheet::OnInitDialog() first, before resizing the sheet, as in the following code.

Sample Code

// This code shows how to resize a modeless CPropertySheet and
// add a button.

// CMySheet is derived from CPropertySheet

          CPropertySheet::OnInitDialog();

          RECT rc;
          GetWindowRect (&rc);
          // Increase the height of the CPropertySheet by 30
          rc.bottom += 30;
          // Increase the width of CPropertySheet by 50
          rc.right +=50;
          // Resize the CPropertySheet
          MoveWindow (rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top);

          // Convert to client coordinates
          ScreenToClient (&rc);
          // m_Button is of type CButton and is a member of CMySheet
          m_Button.Create ("&MyButton", WS_CHILD | WS_VISIBLE | WS_TABSTOP,
             CRect (5, rc.bottom-30, 80, rc.bottom-5), this, IDC_MYBUTTON);
          return TRUE;
}

STATUS

This behavior is by design.