Moving and Resizing the Property Pages

There are two situations where the property sheet will restore the property page based on its original size. This happens when the user clicks on the Apply button or when a different page is selected. Our solution has to handle both these events to be complete.

Step 1: Add CRect variable to track the page size and position

If you don't already have a derived class of CPropertySheet, you will have to derive one so that you can add the member variable and handle a couple of windows messages.

protected:
	m_rectPage;

Step 2: Handle ID_APPLY_NOW in the Property Sheet class

BEGIN_MESSAGE_MAP(CMyPropertySheet, CPropertySheet)
	//{{AFX_MSG_MAP(CMyPropertySheet)
	:
	:
	//}}AFX_MSG_MAP

	ON_COMMAND(ID_APPLY_NOW, OnApplyNow)
END_MESSAGE_MAP()

The handler function is given below. It simply gets the active page and resizes and repositions it using the stored value in m_rectPage. Of course, don't forget the other application specific code that belongs is OnApplyNow().

void CMyPropertySheet::OnApplyNow()
{
	Default();

	GetActivePage()->MoveWindow(m_rectPage);
	
	// Other OnApplyNow code
}

Step 3: Handle the TCN_SELCHANGE notification

BOOL CMyPropertySheet::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
	NMHDR* pNMHDR = (NMHDR*) lParam;

	BOOL bRet = CPropertySheet::OnNotify(wParam, lParam, pResult);
	if (TCN_SELCHANGE == pNMHDR->code)
	{
		// If the message hasn't been handled yet let the control 
		// handle it. This will ascertain that the new page
		// is activated
		if( !bRet )
		{
			LRESULT lRes = Default();
			if( pResult ) 
				*pResult = lRes;
		}
		GetActivePage()->MoveWindow(m_rectPage);
		return TRUE;
	}
	return bRet;
}

Step 4: Move / Resize the active property page

BOOL CMyPropertySheet::OnInitDialog()
{
	BOOL bResult = CPropertySheet::OnInitDialog();

	// Increase width of the property sheet by 100 pixel
	CRect rectWnd;
	GetWindowRect(rectWnd);
	SetWindowPos(NULL, 0, 0,
		rectWnd.Width() + 100,
		rectWnd.Height(),
		SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);

	// Increase width of the tab control by 100 pixel
	GetTabControl()->GetWindowRect(rectWnd);
	GetTabControl()->SetWindowPos(NULL, 0, 0,
			rectWnd.Width() + 100,
			rectWnd.Height(),
			SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);

	// Increase the width of the property page by 100 pixels
	CPropertyPage* pPage = GetActivePage();
	pPage->GetWindowRect(m_rectPage);
	ScreenToClient(m_rectPage);
	m_rectPage.right += 100;
	pPage->MoveWindow(m_rectPage);
		
	return bResult;
}