Click here to Skip to main content
12,813,906 members (31,334 online)
Click here to Skip to main content


210 bookmarked
Posted 24 May 2000


, 25 Jul 2012 CPOL
A CDialog derived class to implement resizable dialogs with MFC

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

// ResizableDialog.h : header file
// Copyright (C) 2000 by Paolo Messina
// (
// 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 <afxtempl.h>

// useful compatibility constants (the only one required is NOANCHOR)

#if !defined(__SIZE_ANCHORS_)
#define __SIZE_ANCHORS_

const CSize
	TOP_LEFT(0,0), TOP_CENTER(50,0), TOP_RIGHT(100,0),
	BOTTOM_LEFT(0,100), BOTTOM_CENTER(50,100), BOTTOM_RIGHT(100,100);

#endif // !defined(__SIZE_ANCHORS_)

// CResizableDialog window

class CResizableDialog : public CDialog

// Construction
	CResizableDialog(UINT nIDTemplate, CWnd* pParentWnd = NULL);
	CResizableDialog(LPCTSTR lpszTemplateName, CWnd* pParentWnd = NULL);

// Attributes
	// flags
	BOOL m_bShowGrip;
	BOOL m_bUseMaxTrack;
	BOOL m_bUseMinTrack;
	BOOL m_bUseMaxRect;
	BOOL m_bEnableSaveRestore;

	// internal status
	CString m_sSection;			// section name and
	CString m_sEntry;			// entry for save/restore

	BOOL m_bInitDone;			// if all internal vars initialized

	SIZE m_szGripSize;			// set at construction time

	CRect m_rcGripRect;			// current pos of grip

	POINT m_ptMinTrackSize;		// min tracking size
	POINT m_ptMaxTrackSize;		// max tracking size
	POINT m_ptMaxPos;			// maximized position
	POINT m_ptMaxSize;			// maximized size

	class Layout
		HWND hwnd;

		BOOL adj_hscroll;
		BOOL need_refresh;

		// upper-left corner
		CSize tl_type;
		CSize tl_margin;
		// bottom-right corner
		CSize br_type;
		CSize br_margin;
			: hwnd(NULL), adj_hscroll(FALSE), need_refresh(FALSE),
			tl_type(0,0), tl_margin(0,0),
			br_type(0,0), br_margin(0,0)

		Layout(HWND hw, SIZE tl_t, SIZE tl_m, 
			SIZE br_t, SIZE br_m, BOOL hscroll, BOOL refresh)
			hwnd = hw;

			adj_hscroll = hscroll;
			need_refresh = refresh;

			tl_type = tl_t;
			tl_margin = tl_m;
			br_type = br_t;
			br_margin = br_m;

	CArray<Layout, Layout&> m_arrLayout;	// list of repositionable controls

// Operations

// Overrides
	// ClassWizard generated virtual function overrides

// Implementation
	virtual ~CResizableDialog();

// used internally
	void Construct();
	void LoadWindowRect();
	void SaveWindowRect();
	void ArrangeLayout();
	void UpdateGripPos();

// callable from derived classes
	void AddAnchor(HWND wnd, CSize tl_type,
		CSize br_type = NOANCHOR);	// add anchors to a control
	void AddAnchor(UINT ctrl_ID, CSize tl_type,
		CSize br_type = NOANCHOR)	// add anchors to a control
		AddAnchor(::GetDlgItem(*this, ctrl_ID), tl_type, br_type);
	void ShowSizeGrip(BOOL bShow);				// show or hide the size grip
	void SetMaximizedRect(const CRect& rc);		// set window rect when maximized
	void ResetMaximizedRect();					// reset to default maximized rect
	void SetMinTrackSize(const CSize& size);	// set minimum tracking size
	void ResetMinTrackSize();					// reset to default minimum tracking size
	void SetMaxTrackSize(const CSize& size);	// set maximum tracking size
	void ResetMaxTrackSize();					// reset to default maximum tracking size
	void EnableSaveRestore(LPCTSTR pszSection, LPCTSTR pszEntry);	// section and entry in app's profile

// Generated message map functions
	virtual BOOL OnInitDialog();
	afx_msg UINT OnNcHitTest(CPoint point);
	afx_msg void OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI);
	afx_msg void OnSize(UINT nType, int cx, int cy);
	afx_msg void OnDestroy();
	afx_msg void OnPaint();


// Microsoft Visual C++ will insert additional declarations immediately before the previous line.


By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.


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


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.

In his job experience 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. 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 (

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

You may also be interested in...

Permalink | Advertise | Privacy | Terms of Use | Mobile
Web02 | 2.8.170308.1 | Last Updated 25 Jul 2012
Article Copyright 2000 by Paolo Messina
Everything else Copyright © CodeProject, 1999-2017
Layout: fixed | fluid