Microsoft Knowledge Base

  How to Resize CPropertyPages at Run
  Time

  Last reviewed:
  July 22, 1997 
  Article ID:
  Q143291 
  4.00 WINDOWS NT kbprg kbcode kbhowto 

  The information in this article applies to: 

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

  SUMMARY

  To resize CPropertyPages in a CPropertySheet at run time: 

    1.Derive a class from CPropertySheet and override OnInitDialog(). 

    2.In OnInitDialog(), resize the CPropertySheet, CTabCtrl, and CPropertyPage(s) by
       using MoveWindow() or SetWindowPos() 

    3.Save the size and position of the CPropertyPage. 

    4.Handle TCN_SELCHANGE in the CPropertySheet, and resize the page. 

    5.Handle ID_APPLY_NOW in the CPropertySheet, and resize the page. 

  MORE INFORMATION

  The CPropertySheet is actually a dialog with a CTabCtrl. Each CPropertyPage is a child of
  the CPropertySheet and is only displayed inside the CTabCtrl. This is why we also have to
  resize the CTabCtrl. To get the CTabCtrl, call CPropertySheet::GetTabControl(). If you are
  changing the height of the property sheet, it may also be necessary to move the sheet's
  buttons. The "Sample Code" section of this article illustrates this. 

  The CPropertySheet remembers the size and position of its CPropertyPages when they are
  first created. When a different tab is selected by the user, the CPropertySheet receives a
  TCN_SELCHANGE notification. In response to this, the CPropertySheet shows the new page
  using the size and position it had when it was first created. The same thing happens when
  the user clicks the Apply button (ID_APPLY_NOW). This is why we have to save the new size
  and position so we can use it to resize the pages later. 

  Sample Code

  /* Compile options needed: default

  */



  // This example adds 50 pixels to the width and height of

  // each page. CMySheet is derived from CPropertySheet. m_PageRect is a

  // member variable of CMySheet and is of type RECT. WM_RESIZEPAGE is a

  // user-defined message.



  // ... prototypes that need to be added to your class definition




  class CMySheet : public CPropertySheet { 

  // ... other members



  // ... make sure you have these members


  protected: 

      RECT m_PageRect;

      virtual BOOL OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult);

      virtual BOOL OnInitDialog();

      afx_msg LRESULT OnResizePage(WPARAM wParam, LPARAM lParam);

      afx_msg void OnApplyNow();


  }; 

  // ... modify and/or implement functions in the .cpp file...



  #define WM_RESIZEPAGE WM_USER + 111




  BEGIN_MESSAGE_MAP(CMySheet, CPropertySheet) 

      //{{AFX_MSG_MAP(CMySheet)

      // NOTE - the ClassWizard will add and remove mapping macros here.



      // ... other message map entries



      //}}AFX_MSG_MAP



      // ... add the 2 following entries here

      ON_MESSAGE (WM_RESIZEPAGE, OnResizePage)

      ON_COMMAND (ID_APPLY_NOW, OnApplyNow)




  END_MESSAGE_MAP() 

  BOOL CMySheet::OnInitDialog() { 

      CPropertySheet::OnInitDialog();



      RECT rc;



      // resize the sheet

      GetWindowRect (&rc);

      ScreenToClient (&rc);

      rc.right += 50;

      rc.bottom += 50;

      MoveWindow (&rc);



      // resize the CTabCtrl

      CTabCtrl* pTab = GetTabControl ();

      ASSERT (pTab);

      pTab->GetWindowRect (&rc);

      ScreenToClient (&rc);

      rc.right += 50;

      rc.bottom += 50;

      pTab->MoveWindow (&rc);



      // resize the page

      CPropertyPage* pPage = GetActivePage ();

      ASSERT (pPage);

      // store page size in m_PageRect

      pPage->GetWindowRect (&m_PageRect);

      ScreenToClient (&m_PageRect);

      m_PageRect.right += 50;

      m_PageRect.bottom += 50;

      pPage->MoveWindow (&m_PageRect);



      // move the OK, Cancel, and Apply buttons

      CWnd* pWnd = GetDlgItem(IDOK);

      pWnd->GetWindowRect(&rc);

      rc.bottom += 50;

      rc.top += 50;

      ScreenToClient(&rc);

      pWnd->MoveWindow(&rc);



      pWnd = GetDlgItem(IDCANCEL);

      pWnd->GetWindowRect(&rc);

      rc.bottom += 50;

      rc.top += 50;

      ScreenToClient(&rc);

      pWnd->MoveWindow(&rc);



      pWnd = GetDlgItem(ID_APPLY_NOW);

      pWnd->GetWindowRect(&rc);

      rc.bottom += 50;

      rc.top += 50;

      ScreenToClient(&rc);

      pWnd->MoveWindow(&rc);



      CenterWindow();



      return TRUE;


  } 

  LONG CMySheet::OnResizePage(UINT, LONG) { 

      // resize the page using m_PageRect which was set in OnInitDialog()

      CPropertyPage* pPage = GetActivePage ();

      ASSERT (pPage);

      pPage->MoveWindow (&m_PageRect);



      return 0;


  } 

  BOOL CMySheet::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult) { 

      NMHDR* pnmh = (LPNMHDR) lParam;



      // the sheet resizes the page whenever it is activated

      // so we need to resize it to what we want

      if (TCN_SELCHANGE == pnmh->code)

          // user-defined message needs to be posted because page must

          // be resized after TCN_SELCHANGE has been processed

          PostMessage (WM_RESIZEPAGE);



      return CPropertySheet::OnNotify(wParam, lParam, pResult);


  } 

  void CMySheet::OnApplyNow()


  { 

      // the sheet resizes the page whenever the Apply button is clicked

      // so we need to resize it to what we want

      PostMessage (WM_RESIZEPAGE);


  } 