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ResizableLib

, 15 Jun 2004
A set of classes to ease the development of resizable windows with MFC
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// ResizableSheet.cpp : implementation file
//
/////////////////////////////////////////////////////////////////////////////
//
// This file is part of ResizableLib
// http://sourceforge.net/projects/resizablelib
//
// Copyright (C) 2000-2004 by Paolo Messina
// http://www.geocities.com/ppescher - mailto:ppescher@hotmail.com
//
// The contents of this file are subject to the Artistic License (the "License").
// You may not use this file except in compliance with the License. 
// You may obtain a copy of the License at:
// http://www.opensource.org/licenses/artistic-license.html
//
// If you find this code useful, credits would be nice!
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "ResizableSheet.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CResizableSheet

IMPLEMENT_DYNAMIC(CResizableSheet, CPropertySheet)

inline void CResizableSheet::PrivateConstruct()
{
	m_bEnableSaveRestore = FALSE;
	m_bSavePage = FALSE;
	m_dwGripTempState = 1;
	m_bLayoutDone = FALSE;
}

inline BOOL CResizableSheet::IsWizard() const
{
	return (m_psh.dwFlags & PSH_WIZARD);
}

CResizableSheet::CResizableSheet()
{
	PrivateConstruct();
}

CResizableSheet::CResizableSheet(UINT nIDCaption, CWnd *pParentWnd, UINT iSelectPage)
	 : CPropertySheet(nIDCaption, pParentWnd, iSelectPage)
{
	PrivateConstruct();
}

CResizableSheet::CResizableSheet(LPCTSTR pszCaption, CWnd *pParentWnd, UINT iSelectPage)
	 : CPropertySheet(pszCaption, pParentWnd, iSelectPage)
{
	PrivateConstruct();
}

CResizableSheet::~CResizableSheet()
{
}

BEGIN_MESSAGE_MAP(CResizableSheet, CPropertySheet)
	//{{AFX_MSG_MAP(CResizableSheet)
	ON_WM_GETMINMAXINFO()
	ON_WM_SIZE()
	ON_WM_DESTROY()
	ON_WM_ERASEBKGND()
	ON_WM_NCCREATE()
	//}}AFX_MSG_MAP
	ON_NOTIFY_REFLECT_EX(PSN_SETACTIVE, OnPageChanging)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CResizableSheet message handlers

BOOL CResizableSheet::OnNcCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (!CPropertySheet::OnNcCreate(lpCreateStruct))
		return FALSE;

	// child dialogs don't want resizable border or size grip,
	// nor they can handle the min/max size constraints
	BOOL bChild = lpCreateStruct->style & WS_CHILD;

	// create and init the size-grip
	if (!CreateSizeGrip(!bChild))
		return FALSE;

	MakeResizable(lpCreateStruct);
	
	return TRUE;
}

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

	// set the initial size as the min track size
	CRect rc;
	GetWindowRect(&rc);
	SetMinTrackSize(rc.Size());

	// initialize layout
	PresetLayout();
	m_bLayoutDone = TRUE;

	return bResult;
}

void CResizableSheet::OnDestroy() 
{
	if (m_bEnableSaveRestore)
	{
		SaveWindowRect(m_sSection, m_bRectOnly);
		if (m_bSavePage)
			SavePage(m_sSection);
	}

	RemoveAllAnchors();

	CPropertySheet::OnDestroy();
}

// maps an index to a button ID and vice-versa
static UINT _propButtons[] =
{
	IDOK, IDCANCEL, ID_APPLY_NOW, IDHELP,
	ID_WIZBACK, ID_WIZNEXT, ID_WIZFINISH
};
const int _propButtonsCount = sizeof(_propButtons)/sizeof(UINT);

// horizontal line in wizard mode
#define ID_WIZLINE	ID_WIZFINISH+1

void CResizableSheet::PresetLayout()
{
	// set the initial size as the min track size
	CRect rc;
	GetWindowRect(&rc);
	SetMinTrackSize(rc.Size());

	if (GetStyle() & WS_CHILD)
	{
		GetClientRect(&rc);
		GetTabControl()->MoveWindow(&rc);
	}

	if (IsWizard())	// wizard mode
	{
		// hide tab control
		GetTabControl()->ShowWindow(SW_HIDE);

		AddAnchor(ID_WIZLINE, BOTTOM_LEFT, BOTTOM_RIGHT);
	}
	else	// tab mode
	{
		AddAnchor(AFX_IDC_TAB_CONTROL, TOP_LEFT, BOTTOM_RIGHT);
	}

	// add a callback for active page (which can change at run-time)
	m_nCallbackID = AddAnchorCallback();

	// use *total* parent size to have correct margins
	CRect rectPage, rectSheet;
	GetTotalClientRect(&rectSheet);

	GetActivePage()->GetWindowRect(&rectPage);
	::MapWindowPoints(NULL, m_hWnd, (LPPOINT)&rectPage, 2);

	// pre-calculate margins
	m_sizePageTL = rectPage.TopLeft() - rectSheet.TopLeft();
	m_sizePageBR = rectPage.BottomRight() - rectSheet.BottomRight();

	// add all possible buttons, if they exist
	for (int i = 0; i < _propButtonsCount; i++)
	{
		if (NULL != GetDlgItem(_propButtons[i]))
			AddAnchor(_propButtons[i], BOTTOM_RIGHT);
	}

	// prevent flickering
	GetTabControl()->ModifyStyle(0, WS_CLIPSIBLINGS);
}

BOOL CResizableSheet::ArrangeLayoutCallback(LAYOUTINFO &layout) const
{
	if (layout.nCallbackID != m_nCallbackID)	// we only added 1 callback
		return CResizableLayout::ArrangeLayoutCallback(layout);

	// set layout info for active page
	layout.hWnd = (HWND)::SendMessage(m_hWnd, PSM_GETCURRENTPAGEHWND, 0, 0);
	if (!::IsWindow(layout.hWnd))
		return FALSE;

	// set margins
	if (IsWizard())	// wizard mode
	{
		// use pre-calculated margins
		layout.marginTopLeft = m_sizePageTL;
		layout.marginBottomRight = m_sizePageBR;
	}
	else	// tab mode
	{
		CTabCtrl* pTab = GetTabControl();
		ASSERT(pTab != NULL);

		// get tab position after resizing and calc page rect
		CRect rectPage, rectSheet;
		GetTotalClientRect(&rectSheet);

		if (!GetAnchorPosition(pTab->m_hWnd, rectSheet, rectPage))
			return FALSE; // no page yet

		// temporarily resize the tab control to calc page size
		CRect rectSave;
		pTab->GetWindowRect(rectSave);
		::MapWindowPoints(NULL, m_hWnd, (LPPOINT)&rectSave, 2);
		pTab->SetRedraw(FALSE);
		pTab->MoveWindow(rectPage, FALSE);
		pTab->AdjustRect(FALSE, &rectPage);
		pTab->MoveWindow(rectSave, FALSE);
		pTab->SetRedraw(TRUE);

		// set margins
		layout.marginTopLeft = rectPage.TopLeft() - rectSheet.TopLeft();
		layout.marginBottomRight = rectPage.BottomRight() - rectSheet.BottomRight();
	}

	// set anchor types
	layout.anchorTopLeft = TOP_LEFT;
	layout.anchorBottomRight = BOTTOM_RIGHT;

	// use this layout info
	return TRUE;
}

void CResizableSheet::OnSize(UINT nType, int cx, int cy) 
{
	CWnd::OnSize(nType, cx, cy);
	
	if (nType == SIZE_MAXHIDE || nType == SIZE_MAXSHOW)
		return;		// arrangement not needed

	if (nType == SIZE_MAXIMIZED)
		HideSizeGrip(&m_dwGripTempState);
	else
		ShowSizeGrip(&m_dwGripTempState);

	// update grip and layout
	UpdateSizeGrip();
	ArrangeLayout();
}

BOOL CResizableSheet::OnPageChanging(NMHDR* /*pNotifyStruct*/, LRESULT* /*pResult*/)
{
	// update new wizard page
	// active page changes after this notification
	PostMessage(WM_SIZE);

	return FALSE;	// continue routing
}

BOOL CResizableSheet::OnEraseBkgnd(CDC* pDC) 
{
	ClipChildren(pDC, FALSE);

	BOOL bRet = CPropertySheet::OnEraseBkgnd(pDC);

	ClipChildren(pDC, TRUE);

	return bRet;
}

BOOL CResizableSheet::CalcSizeExtra(HWND /*hWndChild*/, CSize sizeChild, CSize &sizeExtra)
{
	CTabCtrl* pTab = GetTabControl();
	if (!pTab)
		return FALSE;

	// get margins of tabcontrol
	CRect rectMargins;
	if (!GetAnchorMargins(pTab->m_hWnd, sizeChild, rectMargins))
		return FALSE;

	// get margin caused by tabcontrol
	CRect rectTabMargins(0,0,0,0);

	// get tab position after resizing and calc page rect
	CRect rectPage, rectSheet;
	GetTotalClientRect(&rectSheet);

	if (!GetAnchorPosition(pTab->m_hWnd, rectSheet, rectPage))
		return FALSE; // no page yet

	// temporarily resize the tab control to calc page size
	CRect rectSave;
	pTab->GetWindowRect(rectSave);
	::MapWindowPoints(NULL, m_hWnd, (LPPOINT)&rectSave, 2);
	pTab->SetRedraw(FALSE);
	pTab->MoveWindow(rectPage, FALSE);
	pTab->AdjustRect(TRUE, &rectTabMargins);
	pTab->MoveWindow(rectSave, FALSE);
	pTab->SetRedraw(TRUE);

	// add non-client size
	::AdjustWindowRectEx(&rectTabMargins, GetStyle(), !(GetStyle() & WS_CHILD) &&
		::IsMenu(GetMenu()->GetSafeHmenu()), GetExStyle());

	// compute extra size
	sizeExtra = rectMargins.TopLeft() + rectMargins.BottomRight() +
		rectTabMargins.Size();
	return TRUE;
}

void CResizableSheet::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI) 
{
	MinMaxInfo(lpMMI);

	CTabCtrl* pTab = GetTabControl();
	if (!pTab)
		return;

	int nCount = GetPageCount();
	for (int idx = 0; idx < nCount; ++idx)
	{
		if (IsWizard())	// wizard mode
		{
			// use pre-calculated margins
			CRect rectExtra(-CPoint(m_sizePageTL), -CPoint(m_sizePageBR));
			// add non-client size
			::AdjustWindowRectEx(&rectExtra, GetStyle(), !(GetStyle() & WS_CHILD) &&
				::IsMenu(GetMenu()->GetSafeHmenu()), GetExStyle());
			ChainMinMaxInfo(lpMMI, *GetPage(idx), rectExtra.Size());
		}
		else	// tab mode
		{
			ChainMinMaxInfoCB(lpMMI, *GetPage(idx));
		}
	}
}

// protected members

int CResizableSheet::GetMinWidth()
{
	CWnd* pWnd = NULL;
	CRect rectWnd, rectSheet;
	GetTotalClientRect(&rectSheet);

	int max = 0, min = rectSheet.Width();
	// search for leftmost and rightmost button margins
	for (int i = 0; i < 7; i++)
	{
		pWnd = GetDlgItem(_propButtons[i]);
		// exclude not present or hidden buttons
		if (pWnd == NULL || !(pWnd->GetStyle() & WS_VISIBLE))
			continue;

		// left position is relative to the right border
		// of the parent window (negative value)
		pWnd->GetWindowRect(&rectWnd);
		::MapWindowPoints(NULL, m_hWnd, (LPPOINT)&rectWnd, 2);
		int left = rectSheet.right - rectWnd.left;
		int right = rectSheet.right - rectWnd.right;

		if (left > max)
			max = left;
		if (right < min)
			min = right;
	}

	// sizing border width
	int border = GetSystemMetrics(SM_CXSIZEFRAME);
	
	// compute total width
	return max + min + 2*border;
}


// NOTE: this must be called after all the other settings
//       to have the window and its controls displayed properly
void CResizableSheet::EnableSaveRestore(LPCTSTR pszSection, BOOL bRectOnly, BOOL bWithPage)
{
	m_sSection = pszSection;
	m_bSavePage = bWithPage;

	m_bEnableSaveRestore = TRUE;
	m_bRectOnly = bRectOnly;

	// restore immediately
	LoadWindowRect(pszSection, bRectOnly);
	{
		LoadPage(pszSection);
		ArrangeLayout();	// needs refresh
	}
}

void CResizableSheet::RefreshLayout()
{
	SendMessage(WM_SIZE);
}

LRESULT CResizableSheet::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 
{
	if (message != WM_NCCALCSIZE || wParam == 0 || !m_bLayoutDone)
		return CPropertySheet::WindowProc(message, wParam, lParam);

	// specifying valid rects needs controls already anchored
	LRESULT lResult = 0;
	HandleNcCalcSize(FALSE, (LPNCCALCSIZE_PARAMS)lParam, lResult);
	lResult = CPropertySheet::WindowProc(message, wParam, lParam);
	HandleNcCalcSize(TRUE, (LPNCCALCSIZE_PARAMS)lParam, lResult);
	return lResult;
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Paolo Messina
Software Developer RoboTech srl
Italy Italy
Paolo began programming at the age of 9 with a glorious 8086 and GW-BASIC, then he played a bit with C, ASM and Pascal. He tought himself MFC and Windows programming, to exploit his studies of C++. Always attracted by low-level programming and Assembly, he's beginning to appreciate the joys of templates and STL. At work he changed his mind about Java, discovered Eclipse IDE, and now think it's cool.
 
He lives in Follonica, Italy.
 
He has been abroad in the U.S. to work on his final thesis before graduating. For seven months he was playing with airplanes and automatic control at the Unversity of Illinois at Urbana-Champaign.
 
He graduated in Computer Science Engineering at the University of Pisa, Italy, in December 2003.
 
Currently working for an edutainment robotics company (www.robotechsrl.com).
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