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ResizableLib

, 15 Jun 2004
A set of classes to ease the development of resizable windows with MFC
resizabledialog_demo_1_4a.zip
ResizableDialog
Demo.dsp
Demo.dsw
Release_Static
Demo.exe
Demo.exe.manifest
res
bitmap1.bmp
Demo.ico
toolbar1.bmp
resizableformviewmdi_demo_1_4a.zip
ResizableFormViewMDI
Demo.dsp
Demo.dsw
Release_Static
Demo.exe
Demo.exe.manifest
res
Demo.ico
DemoDoc.ico
DemoDoc0.ico
DemoDoc1.ico
DemoDoc2.ico
resizableformviewsdi_demo_1_4a.zip
ResizableFormViewSDI
Demo.dsp
Demo.dsw
Release_Static
Demo.exe
Demo.exe.manifest
res
Demo.ico
DemoDoc.ico
Toolbar.bmp
resizablelib_1_1.zip
ResizableLib
.cvsignore
Docs
CVS
Entries
Repository
Root
Release_Static
ResizableLib.lib
ResizableLib.dsp
ResizableLib.dsw
resizablelib_1_2.zip
.cvsignore
ResizableLib.dsp
ResizableLib.dsw
resizablelib_1_3.zip
ChangeLog
ResizableLib.dsp
ResizableLib.dsw
ResizableMsgSupport.inl
resizablelib_1_4a.zip
Doxyfile-include
Doxyfile
ResizableLib.dsp
ResizableLib.dsw
resizablelib_src.zip
ResizableLib.dsp
ResizableLib.dsw
.cvsignore
resizableproperties_demo_1_4a.zip
ResizableProperties
Demo.dsp
Demo.dsw
Release_Static
Demo.exe
Demo.exe.manifest
res
Demo.ico
resizablewizard97_demo_1_4a.zip
ResizableWizard97
Release_Static
Wizard97.exe
Wizard97.exe.manifest
res
Baner16.bmp
Baner256.bmp
Water16.bmp
Water256.bmp
Wizard97.ico
Wizard97.dsp
Wizard97.dsw
// 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
{
protected:
	class LayoutInfo
	{
	public:
		HWND hWnd;
		UINT nCallbackID;

		CString sWndClass;

		// upper-left corner
		SIZE sizeTypeTL;
		SIZE sizeMarginTL;
		
		// bottom-right corner
		SIZE sizeTypeBR;
		SIZE sizeMarginBR;
	
	public:
		LayoutInfo() : hWnd(NULL), nCallbackID(0)
		{ }

		LayoutInfo(HWND hwnd, SIZE tl_t, SIZE tl_m, 
			SIZE br_t, SIZE br_m, CString classname)
			: hWnd(hwnd), nCallbackID(0), sWndClass(classname),
			sizeTypeTL(tl_t), sizeMarginTL(tl_m),
			sizeTypeBR(br_t), sizeMarginBR(br_m)
		{ }
	};

private:
	// list of repositionable controls
	CMap<HWND, HWND, POSITION, POSITION> m_mapLayout;
	CList<LayoutInfo, LayoutInfo&> m_listLayout;
	CList<LayoutInfo, LayoutInfo&> m_listLayoutCB;

	void ClipChildWindow(const CResizableLayout::LayoutInfo &layout, CRgn* pRegion);

	void CalcNewChildPosition(const CResizableLayout::LayoutInfo &layout,
		const CRect &rectParent, CRect &rectChild, UINT& uFlags);

protected:
	// override to specify clipping for custom or unsupported windows
	virtual BOOL LikesClipping(const CResizableLayout::LayoutInfo &layout);

	// override to specify refresh for custom or unsupported windows
	virtual BOOL NeedsRefresh(const CResizableLayout::LayoutInfo &layout,
		const CRect &rectOld, const CRect &rectNew);

	// paint the background on the given DC (for XP theme's compatibility)
	void EraseBackground(CDC* pDC);

	// clip out child windows from the given DC (support old code)
	void ClipChildren(CDC* pDC);

	// get the clipping region (without clipped child windows)
	void GetClippingRegion(CRgn* pRegion);
	
	// 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);

	// get rect of an anchored window, given the parent's client area
	BOOL GetAnchorPosition(HWND hWnd, const CRect &rectParent,
		CRect &rectChild, UINT& uFlags)
	{
		POSITION pos;
		if (!m_mapLayout.Lookup(hWnd, pos))
			return FALSE;

		CalcNewChildPosition(m_listLayout.GetAt(pos), rectParent, rectChild, uFlags);
		return TRUE;
	}

	// get rect of an anchored window, given the parent's client area
	BOOL GetAnchorPosition(UINT nID, const CRect &rectParent,
		CRect &rectChild, UINT& uFlags)
	{
		return GetAnchorPosition(::GetDlgItem(GetResizableWnd()->GetSafeHwnd(), nID),
			rectParent, rectChild, uFlags);
	}

	// remove an anchored control from the layout, given its HWND
	BOOL RemoveAnchor(HWND hWnd)
	{
		POSITION pos;
		if (!m_mapLayout.Lookup(hWnd, pos))
			return FALSE;

		m_listLayout.RemoveAt(pos);
		return m_mapLayout.RemoveKey(hWnd);
	}

	// remove an anchored control from the layout, given its HWND
	BOOL RemoveAnchor(UINT nID)
	{
		return RemoveAnchor(::GetDlgItem(GetResizableWnd()->GetSafeHwnd(), nID));
	}

	// reset layout content
	void RemoveAllAnchors()
	{
		m_mapLayout.RemoveAll();
		m_listLayout.RemoveAll();
		m_listLayoutCB.RemoveAll();
	}

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

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

	// override to provide the parent window
	virtual CWnd* GetResizableWnd() = 0;

public:
	CResizableLayout() { }

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

#endif // !defined(AFX_RESIZABLELAYOUT_H__INCLUDED_)

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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
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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