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ResizableLib

, 15 Jun 2004
A set of classes to ease the development of resizable windows with MFC
resizabledialog_demo_1_4a.zip
ResizableDialog
Demo.dsp
Demo.dsw
Release_Static
Demo.exe
Demo.exe.manifest
res
bitmap1.bmp
Demo.ico
toolbar1.bmp
resizableformviewmdi_demo_1_4a.zip
ResizableFormViewMDI
Demo.dsp
Demo.dsw
Release_Static
Demo.exe
Demo.exe.manifest
res
Demo.ico
DemoDoc.ico
DemoDoc0.ico
DemoDoc1.ico
DemoDoc2.ico
resizableformviewsdi_demo_1_4a.zip
ResizableFormViewSDI
Demo.dsp
Demo.dsw
Release_Static
Demo.exe
Demo.exe.manifest
res
Demo.ico
DemoDoc.ico
Toolbar.bmp
resizablelib_1_1.zip
ResizableLib
.cvsignore
Docs
CVS
Entries
Repository
Root
Release_Static
ResizableLib.lib
ResizableLib.dsp
ResizableLib.dsw
resizablelib_1_2.zip
.cvsignore
ResizableLib.dsp
ResizableLib.dsw
resizablelib_1_3.zip
ChangeLog
ResizableLib.dsp
ResizableLib.dsw
ResizableMsgSupport.inl
resizablelib_1_4a.zip
Doxyfile-include
Doxyfile
ResizableLib.dsp
ResizableLib.dsw
resizablelib_src.zip
ResizableLib.dsp
ResizableLib.dsw
.cvsignore
resizableproperties_demo_1_4a.zip
ResizableProperties
Demo.dsp
Demo.dsw
Release_Static
Demo.exe
Demo.exe.manifest
res
Demo.ico
resizablewizard97_demo_1_4a.zip
ResizableWizard97
Release_Static
Wizard97.exe
Wizard97.exe.manifest
res
Baner16.bmp
Baner256.bmp
Water16.bmp
Water256.bmp
Wizard97.ico
Wizard97.dsp
Wizard97.dsw
// ResizableSheet.cpp : implementation file
//
/////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2000-2001 by Paolo Messina
// (http://www.geocities.com/ppescher - ppescher@yahoo.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::Construct()
{
	m_bInitDone = FALSE;

	m_bEnableSaveRestore = FALSE;
	m_bSavePage = FALSE;
}


CResizableSheet::CResizableSheet()
{
	Construct();
}

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

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

CResizableSheet::~CResizableSheet()
{
}

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

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

int CResizableSheet::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CPropertySheet::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// keep client area
	CRect rect;
	GetClientRect(&rect);
	// set resizable style
	ModifyStyle(DS_MODALFRAME, WS_POPUP | WS_THICKFRAME);
	// adjust size to reflect new style
	::AdjustWindowRectEx(&rect, GetStyle(),
		::IsMenu(GetMenu()->GetSafeHmenu()), GetExStyle());
	SetWindowPos(NULL, 0, 0, rect.Width(), rect.Height(), SWP_FRAMECHANGED|
		SWP_NOMOVE|SWP_NOZORDER|SWP_NOACTIVATE|SWP_NOREPOSITION);

	if (!InitGrip())
		return -1;

	return 0;
}

BOOL CResizableSheet::OnInitDialog() 
{
	BOOL bResult = CPropertySheet::OnInitDialog();
	
	// set the initial size as the min track size
	CRect rc;
	GetWindowRect(&rc);
	SetMinTrackSize(rc.Size());

	// init

	UpdateGripPos();

	PresetLayout();

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

	m_bInitDone = TRUE;

	return bResult;
}

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

	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
};

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

void CResizableSheet::PresetLayout()
{
	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)
	AddAnchorCallback(1);

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

	GetActivePage()->GetWindowRect(&rectPage);
	ScreenToClient(&rectPage);

	// 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 < 7; i++)
	{
		if (NULL != GetDlgItem(_propButtons[i]))
			AddAnchor(_propButtons[i], BOTTOM_RIGHT);
	}
}

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

	// set layout info for active page
	layout.hWnd = GetActivePage()->GetSafeHwnd();

	// set margins
	if (IsWizard())	// wizard mode
	{
		// use pre-calculated margins
		layout.sizeMarginTL = m_sizePageTL;
		layout.sizeMarginBR = m_sizePageBR;
	}
	else	// tab mode
	{
		CRect rectPage, rectSheet;
		GetTotalClientRect(&rectSheet);

		CTabCtrl* pTab = GetTabControl();
		pTab->GetWindowRect(&rectPage);
		pTab->AdjustRect(FALSE, &rectPage);
		ScreenToClient(&rectPage);

		// use tab control
		layout.sizeMarginTL = rectPage.TopLeft() - rectSheet.TopLeft();
		layout.sizeMarginBR = rectPage.BottomRight() - rectSheet.BottomRight();
	}

	// set anchor types
	layout.sizeTypeTL = TOP_LEFT;
	layout.sizeTypeBR = 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 (m_bInitDone)
	{
		// update size-grip
		UpdateGripPos();

		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);

	return CPropertySheet::OnEraseBkgnd(pDC);
}

void CResizableSheet::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI) 
{
	if (!m_bInitDone)
		return;

	MinMaxInfo(lpMMI);
}

// 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);
		ScreenToClient(&rectWnd);
		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();
}

// private memebers

// used to save/restore active page
// either in the registry or a private .INI file
// depending on your application settings

#define ACTIVEPAGE 	_T("ActivePage")

void CResizableSheet::SavePage()
{
	if (!m_bSavePage)
		return;

	// saves active page index, zero (the first) if problems
	// cannot use GetActivePage, because it always fails

	CTabCtrl *pTab = GetTabControl();
	int page = 0;

	if (pTab != NULL) 
		page = pTab->GetCurSel();
	if (page < 0)
		page = 0;

	AfxGetApp()->WriteProfileInt(m_sSection, ACTIVEPAGE, page);
}

void CResizableSheet::LoadPage()
{
	// restore active page, zero (the first) if not found
	int page = AfxGetApp()->GetProfileInt(m_sSection, ACTIVEPAGE, 0);
	
	if (m_bSavePage)
	{
		SetActivePage(page);
		ArrangeLayout();	// needs refresh
	}
}

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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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