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CResizableDialog

, 25 Jul 2012 CPOL
A CDialog derived class to implement resizable dialogs with MFC
// 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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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Paolo Messina
Technical Lead RoboTech srl
Italy Italy
Paolo began programming at the age of 9 with a glorious Olivetti M24 (i8086) and GW-BASIC, then he played a bit with Turbo C, Turbo Pascal and Assembly (using the MS-DOS Debug). Quick BASIC and Visual Basic shortly followed, until he learned C++ in College. He tought himself MFC and Windows programming, along with some DHTML and Javascript.

Always attracted by low-level programming and Assembly, he started to appreciate the joys of templates and STL while working for his Master Thesis. For seven months he was playing with airplanes and automatic control at the Unversity of Illinois at Urbana-Champaign, where he first met QNX and embedded systems.

At work he learned Java to develop user interfaces and graphical editors, and re-discovered the Eclipse IDE that he had used in its early versions with the QNX SDK. There he also deepened his knowledge of Linux and embedded systems, microcontrollers firmware and embedded voice recognition, while also practicing electronics design.

He graduated in Computer Engineering (Ingegneria informatica) at the University of Pisa, Italy, in December 2003. Currently working for an edutainment robotics company (www.robotechsrl.com).

He lives in Peccioli (Pisa) and Follonica (GR), Italy.

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