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CResizableDialog

, 25 Jul 2012 CPOL
A CDialog derived class to implement resizable dialogs with MFC
// ResizableLayout.h: interface for the CResizableLayout class.
//
/////////////////////////////////////////////////////////////////////////////
//
// 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!
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_RESIZABLELAYOUT_H__INCLUDED_)
#define AFX_RESIZABLELAYOUT_H__INCLUDED_

#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),
	MIDDLE_LEFT(0,50), MIDDLE_CENTER(50,50), MIDDLE_RIGHT(100,50),
	BOTTOM_LEFT(0,100), BOTTOM_CENTER(50,100), BOTTOM_RIGHT(100,100);


class CResizableLayout
{
	class LayoutInfo
	{
	public:
		HWND hWnd;
		UINT nCallbackID;

		BOOL bAdjHScroll;
		BOOL bNeedRefresh;

		// upper-left corner
		SIZE sizeTypeTL;
		SIZE sizeMarginTL;
		
		// bottom-right corner
		SIZE sizeTypeBR;
		SIZE sizeMarginBR;
	
	public:
		LayoutInfo()
		{ 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);

protected:
	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_arrLayout.RemoveAll();
		m_iFirstCallback = 0;
	}

	virtual CWnd* GetResizableWnd() = 0;

public:
	CResizableLayout() { m_iFirstCallback = 0; }

	virtual ~CResizableLayout()
	{
		// just for safety
		RemoveAllAnchors();
	}
};

#endif // !defined(AFX_RESIZABLELAYOUT_H__INCLUDED_)

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License

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
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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