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Posted 24 May 2000


, 25 Jul 2012
A CDialog derived class to implement resizable dialogs with MFC
// ResizableLayout.h: interface for the CResizableLayout class.
// Copyright (C) 2000-2001 by Paolo Messina
// ( -
// 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:
// If you find this code useful, credits would be nice!


#include <afxtempl.h>

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

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

const CSize NOANCHOR(-1,-1),
	TOP_LEFT(0,0), TOP_CENTER(50,0), TOP_RIGHT(100,0),
	BOTTOM_LEFT(0,100), BOTTOM_CENTER(50,100), BOTTOM_RIGHT(100,100);

class CResizableLayout
	class LayoutInfo
		HWND hWnd;
		UINT nCallbackID;

		BOOL bAdjHScroll;
		BOOL bNeedRefresh;

		// upper-left corner
		SIZE sizeTypeTL;
		SIZE sizeMarginTL;
		// bottom-right corner
		SIZE sizeTypeBR;
		SIZE sizeMarginBR;
		{ ZeroMemory(this, sizeof(LayoutInfo)); }

		LayoutInfo(HWND hwnd, SIZE tl_t, SIZE tl_m, 
			SIZE br_t, SIZE br_m, BOOL hscroll, BOOL refresh)
			hWnd = hwnd;
			nCallbackID = 0;

			bAdjHScroll = hscroll;
			bNeedRefresh = refresh;

			sizeTypeTL = tl_t;
			sizeMarginTL = tl_m;
			sizeTypeBR = br_t;
			sizeMarginBR = br_m;

	// list of repositionable controls (in 2 parts: anchors, callbacks)
	CArray<LayoutInfo, LayoutInfo&> m_arrLayout;
	int m_iFirstCallback;		// index of first callback

	void EnumAndClipChildWindow(HWND hWnd, CDC* pDC);

	virtual BOOL LikesClipping(HWND hWnd);
	virtual BOOL NeedsRefresh(HWND hWnd);

	// exclude child windows from the clipping region
	void ClipChildren(CDC *pDC);
	// override for scrollable or expanding parent windows
	virtual void GetTotalClientRect(LPRECT lpRect);

	// add anchors to a control, given its HWND
	void AddAnchor(HWND hWnd, CSize sizeTypeTL, CSize sizeTypeBR = NOANCHOR);

	// add anchors to a control, given its ID
	void AddAnchor(UINT nID, CSize sizeTypeTL, CSize sizeTypeBR = NOANCHOR)
		AddAnchor(::GetDlgItem(GetResizableWnd()->GetSafeHwnd(), nID),
			sizeTypeTL, sizeTypeBR);

	// add a callback (control ID or HWND is unknown or may change)
	void AddAnchorCallback(UINT nCallbackID);

	// adjust children's layout, when parent's size changes
	void ArrangeLayout();

	// override to provide dynamic control's layout info
	virtual BOOL ArrangeLayoutCallback(LayoutInfo& layout);

	// reset layout content
	void RemoveAllAnchors()
		m_iFirstCallback = 0;

	virtual CWnd* GetResizableWnd() = 0;

	CResizableLayout() { m_iFirstCallback = 0; }

	virtual ~CResizableLayout()
		// just for safety


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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.

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.

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