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CResizableDialog

, 25 Jul 2012 CPOL
A CDialog derived class to implement resizable dialogs with MFC
// ResizableDialog.cpp : implementation file
//
/////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2000 by Paolo Messina
// (ppescher@yahoo.com)
//
// Free for non-commercial and commercial use,
// provided that the original author's name
// and copyright is quoted somewhere in the
// final executable and in the program's help
// or documentation.
// You may change the code to your needs,
// provided that credits to the original
// author are given in the modified files.
// Also a copy of your enhancements would
// be nice, but it's not required. Please,
// consider to share your work on CodeProject.
//  
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "ResizableDialog.h"

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

/////////////////////////////////////////////////////////////////////////////
// CResizableDialog

inline void CResizableDialog::Construct()
{
	m_bInitDone = FALSE;

	m_bUseMinTrack = TRUE;
	m_bUseMaxTrack = FALSE;
	m_bUseMaxRect = FALSE;

	m_bShowGrip = TRUE;
	
	m_bEnableSaveRestore = FALSE;

	m_szGripSize.cx = GetSystemMetrics(SM_CXVSCROLL);
	m_szGripSize.cy = GetSystemMetrics(SM_CYHSCROLL);
}

CResizableDialog::CResizableDialog()
{
	Construct();
}

CResizableDialog::CResizableDialog(UINT nIDTemplate, CWnd* pParentWnd)
	: CDialog(nIDTemplate, pParentWnd)
{
	Construct();
}

CResizableDialog::CResizableDialog(LPCTSTR lpszTemplateName, CWnd* pParentWnd)
	: CDialog(lpszTemplateName, pParentWnd)
{
	Construct();
}

CResizableDialog::~CResizableDialog()
{
	// for safety
	m_arrLayout.RemoveAll();
}


BEGIN_MESSAGE_MAP(CResizableDialog, CDialog)
	//{{AFX_MSG_MAP(CResizableDialog)
	ON_WM_NCHITTEST()
	ON_WM_GETMINMAXINFO()
	ON_WM_SIZE()
	ON_WM_DESTROY()
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()


/////////////////////////////////////////////////////////////////////////////
// CResizableDialog message handlers


BOOL CResizableDialog::OnInitDialog() 
{
	CDialog::OnInitDialog();

	UpdateGripPos();

	// gets the template size as the min track size
	CRect rc;
	GetWindowRect(&rc);
	m_ptMinTrackSize.x = rc.Width();
	m_ptMinTrackSize.y = rc.Height();

	m_bInitDone = TRUE;

	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

void CResizableDialog::OnDestroy() 
{
	CDialog::OnDestroy();
	
	if (m_bEnableSaveRestore)
		SaveWindowRect();

	// remove old windows
	m_arrLayout.RemoveAll();
}

void CResizableDialog::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	
	if (m_bShowGrip && !IsZoomed())
	{
		// draw size-grip
		dc.DrawFrameControl(&m_rcGripRect, DFC_SCROLL, DFCS_SCROLLSIZEGRIP);
	}
}

void CResizableDialog::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)
	{
		ArrangeLayout();
	}
}

UINT CResizableDialog::OnNcHitTest(CPoint point) 
{
	CPoint pt = point;
	ScreenToClient(&pt);

	// if in size grip and in client area
	if (m_bShowGrip && m_rcGripRect.PtInRect(pt) &&
		pt.x >= 0 && pt.y >= 0)
		return HTBOTTOMRIGHT;
	
	return CDialog::OnNcHitTest(point);
}

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

	if (m_bUseMinTrack)
		lpMMI->ptMinTrackSize = m_ptMinTrackSize;

	if (m_bUseMaxTrack)
		lpMMI->ptMaxTrackSize = m_ptMaxTrackSize;

	if (m_bUseMaxRect)
	{
		lpMMI->ptMaxPosition = m_ptMaxPos;
		lpMMI->ptMaxSize = m_ptMaxSize;
	}
}

// layout functions

void CResizableDialog::AddAnchor(HWND wnd, CSize tl_type, CSize br_type)
{
	ASSERT(wnd != NULL && ::IsWindow(wnd));
	ASSERT(::IsChild(*this, wnd));
	ASSERT(tl_type != NOANCHOR);

	// get control's window class
	
	CString st;
	GetClassName(wnd, st.GetBufferSetLength(MAX_PATH), MAX_PATH);
	st.ReleaseBuffer();
	st.MakeUpper();

	// add the style 'clipsiblings' to a GroupBox
	// to avoid unnecessary repainting of controls inside
	if (st == "BUTTON")
	{
		DWORD style = GetWindowLong(wnd, GWL_STYLE);
		if ((style & 0x0FL) == BS_GROUPBOX)
			SetWindowLong(wnd, GWL_STYLE, style | WS_CLIPSIBLINGS);
	}

	// wnd classes that don't redraw client area correctly
	// when the hor scroll pos changes due to a resizing
	BOOL hscroll = FALSE;
	if (st == "LISTBOX")
		hscroll = TRUE;

	// wnd classes that need refresh when resized
	BOOL refresh = FALSE;
	if (st == "STATIC")
	{
		DWORD style = GetWindowLong(wnd, GWL_STYLE);

		switch (style & SS_TYPEMASK)
		{
		case SS_LEFT:
		case SS_CENTER:
		case SS_RIGHT:
			// word-wrapped text needs refresh
			refresh = TRUE;
		}

		// centered images or text need refresh
		if (style & SS_CENTERIMAGE)
			refresh = TRUE;

		// simple text never needs refresh
		if (style & SS_TYPEMASK == SS_SIMPLE)
			refresh = FALSE;
	}

	// get dialog's and control's rect
	CRect wndrc, objrc;

	GetClientRect(&wndrc);
	::GetWindowRect(wnd, &objrc);
	ScreenToClient(&objrc);
	
	CSize tl_margin, br_margin;

	if (br_type == NOANCHOR)
		br_type = tl_type;
	
	// calculate margin for the top-left corner

	tl_margin.cx = objrc.left - wndrc.Width() * tl_type.cx / 100;
	tl_margin.cy = objrc.top - wndrc.Height() * tl_type.cy / 100;
	
	// calculate margin for the bottom-right corner

	br_margin.cx = objrc.right - wndrc.Width() * br_type.cx / 100;
	br_margin.cy = objrc.bottom - wndrc.Height() * br_type.cy / 100;

	// add to the list
	Layout obj(wnd, tl_type, tl_margin,	br_type, br_margin, hscroll, refresh);
	m_arrLayout.Add(obj);
}

void CResizableDialog::ArrangeLayout()
{
	// update size-grip
	InvalidateRect(&m_rcGripRect);
	UpdateGripPos();
	InvalidateRect(&m_rcGripRect);

	// init some vars
	CRect wndrc;
	GetClientRect(&wndrc);

	int i, count = m_arrLayout.GetSize();
	HDWP hdwp = BeginDeferWindowPos(count);

	for (i=0; i<count; ++i)
	{
		Layout& obj = m_arrLayout[i];

		CRect objrc, newrc;
		CWnd* wnd = CWnd::FromHandle(obj.hwnd); // temporary solution

		wnd->GetWindowRect(&objrc);
		ScreenToClient(&objrc);
		
		// calculate new top-left corner

		newrc.left = obj.tl_margin.cx + wndrc.Width() * obj.tl_type.cx / 100;
		newrc.top = obj.tl_margin.cy + wndrc.Height() * obj.tl_type.cy / 100;
		
		// calculate new bottom-right corner

		newrc.right = obj.br_margin.cx + wndrc.Width() * obj.br_type.cx / 100;
		newrc.bottom = obj.br_margin.cy + wndrc.Height() * obj.br_type.cy / 100;

		if (!newrc.EqualRect(&objrc))
		{
			if (obj.adj_hscroll)
			{
				// needs repainting, due to horiz scrolling
				int diff = newrc.Width() - objrc.Width();
				int max = wnd->GetScrollLimit(SB_HORZ);
			
				obj.need_refresh = FALSE;
				if (max > 0 && wnd->GetScrollPos(SB_HORZ) > max - diff)
				{
					obj.need_refresh = TRUE;
				}
			}

			// set flags 
			DWORD flags = SWP_NOZORDER | SWP_NOACTIVATE | SWP_NOREPOSITION;
			if (newrc.TopLeft() == objrc.TopLeft())
				flags |= SWP_NOMOVE;
			if (newrc.Size() == objrc.Size())
				flags |= SWP_NOSIZE;
			
			DeferWindowPos(hdwp, obj.hwnd, NULL, newrc.left, newrc.top,
				newrc.Width(), newrc.Height(), flags);
		}
	}
	// go re-arrange child windows
	EndDeferWindowPos(hdwp);

	// refresh those that need
	for (i=0; i<count; ++i)
	{
		Layout& obj = m_arrLayout[i];
		CWnd* wnd = CWnd::FromHandle(obj.hwnd); // temporary solution
	
		if (obj.need_refresh)
		{
			wnd->Invalidate();
			wnd->UpdateWindow();
		}
	}
}

void CResizableDialog::UpdateGripPos()
{
	// size-grip goes bottom right in the client area

	GetClientRect(&m_rcGripRect);

	m_rcGripRect.left = m_rcGripRect.right - m_szGripSize.cx;
	m_rcGripRect.top = m_rcGripRect.bottom - m_szGripSize.cy;
}

// protected members

void CResizableDialog::ShowSizeGrip(BOOL bShow)
{
	if (m_bShowGrip != bShow)
	{
		m_bShowGrip = bShow;
		InvalidateRect(&m_rcGripRect);
	}
}

void CResizableDialog::SetMaximizedRect(const CRect& rc)
{
	m_bUseMaxRect = TRUE;

	m_ptMaxPos = rc.TopLeft();
	m_ptMaxSize.x = rc.Width();
	m_ptMaxSize.y = rc.Height();
}

void CResizableDialog::ResetMaximizedRect()
{
	m_bUseMaxRect = FALSE;
}

void CResizableDialog::SetMinTrackSize(const CSize& size)
{
	m_bUseMinTrack = TRUE;

	m_ptMinTrackSize.x = size.cx;
	m_ptMinTrackSize.y = size.cy;
}

void CResizableDialog::ResetMinTrackSize()
{
	m_bUseMinTrack = FALSE;
}

void CResizableDialog::SetMaxTrackSize(const CSize& size)
{
	m_bUseMaxTrack = TRUE;

	m_ptMaxTrackSize.x = size.cx;
	m_ptMaxTrackSize.y = size.cy;
}

void CResizableDialog::ResetMaxTrackSize()
{
	m_bUseMaxTrack = FALSE;
}

// NOTE: this must be called after all the other settings
//       to have the dialog and its controls displayed properly
void CResizableDialog::EnableSaveRestore(LPCTSTR pszSection, LPCTSTR pszEntry)
{
	m_sSection = pszSection;
	m_sEntry = pszEntry;

	m_bEnableSaveRestore = TRUE;

	LoadWindowRect();
}


// used to save/restore window's size and position
// either in the registry or a private .INI file
// depending on your application settings

#define PROFILE_FMT 	_T("%d,%d,%d,%d,%d,%d")

void CResizableDialog::SaveWindowRect()
{
	CString data;
	WINDOWPLACEMENT wp;

	ZeroMemory(&wp, sizeof(WINDOWPLACEMENT));
	wp.length = sizeof(WINDOWPLACEMENT);
	GetWindowPlacement(&wp);
	
	RECT& rc = wp.rcNormalPosition;	// alias

	data.Format(PROFILE_FMT, rc.left, rc.top,
		rc.right, rc.bottom, wp.showCmd, wp.flags);

	AfxGetApp()->WriteProfileString(m_sSection, m_sEntry, data);
}

void CResizableDialog::LoadWindowRect()
{
	CString data;
	WINDOWPLACEMENT wp;

	data = AfxGetApp()->GetProfileString(m_sSection, m_sEntry);
	
	if (data.IsEmpty())	// never saved before
		return;
	
	ZeroMemory(&wp, sizeof(WINDOWPLACEMENT));
	wp.length = sizeof(WINDOWPLACEMENT);
	GetWindowPlacement(&wp);

	RECT& rc = wp.rcNormalPosition;	// alias

	if (_stscanf(data, PROFILE_FMT, &rc.left, &rc.top,
		&rc.right, &rc.bottom, &wp.showCmd, &wp.flags) == 6)
	{
		SetWindowPlacement(&wp);
	}
}

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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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