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CResizableDialog

, 25 Jul 2012
A CDialog derived class to implement resizable dialogs with MFC
resizabledialog_1_1.zip
ResizableDialog
.cvsignore
Demo.dsp
Demo.dsw
Release_Static
Demo.exe
res
bitmap1.bmp
Demo.ico
toolbar1.bmp
resizabledialog_demo.zip
Demo.dsp
Demo.dsw
Release
Demo.exe
bitmap1.bmp
Demo.ico
toolbar1.bmp
resizabledialog_src.zip
resizablelib_1_1.zip
ResizableLib
.cvsignore
Docs
CVS
Entries
Repository
Root
Release_Static
ResizableLib.lib
ResizableLib.dsp
ResizableLib.dsw
// ResizableGrip.cpp: implementation of the CResizableGrip 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!
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "ResizableGrip.h"

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

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CResizableGrip::CResizableGrip()
{
	m_sizeGrip.cx = GetSystemMetrics(SM_CXVSCROLL);
	m_sizeGrip.cy = GetSystemMetrics(SM_CYHSCROLL);
}

CResizableGrip::~CResizableGrip()
{

}

void CResizableGrip::UpdateGripPos()
{
	// size-grip goes bottom right in the client area
	// (any right-to-left adjustment should go here)

	RECT rect;
	GetResizableWnd()->GetClientRect(&rect);

	rect.left = rect.right - m_sizeGrip.cx;
	rect.top = rect.bottom - m_sizeGrip.cy;

	// must stay below other children
	m_wndGrip.SetWindowPos(&CWnd::wndBottom, rect.left, rect.top, 0, 0,
		SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOREPOSITION);

	// maximized windows cannot be resized
	if (GetResizableWnd()->IsZoomed())
		m_wndGrip.EnableWindow(FALSE);
	else
		m_wndGrip.EnableWindow(TRUE);
}

void CResizableGrip::ShowSizeGrip(BOOL bShow)
{
	m_wndGrip.ShowWindow(bShow ? SW_SHOW : SW_HIDE);
}

#define RSZ_GRIP_OBJ	_T("ResizableGrip")

BOOL CResizableGrip::InitGrip()
{
	CRect rect(0 , 0, m_sizeGrip.cx, m_sizeGrip.cy);

	BOOL bRet = m_wndGrip.Create(WS_CHILD | WS_CLIPSIBLINGS | SBS_SIZEGRIP,
		rect, GetResizableWnd(), 0);

	if (bRet)
	{
		// set a triangular window region
		CRgn rgnGrip, rgn;
		rgn.CreateRectRgn(0,0,1,1);
		rgnGrip.CreateRectRgnIndirect(&rect);
	
		for (int y=0; y<m_sizeGrip.cy; y++)
		{
			rgn.SetRectRgn(0, y, m_sizeGrip.cx-y, y+1);
			rgnGrip.CombineRgn(&rgnGrip, &rgn, RGN_DIFF);
		}
		m_wndGrip.SetWindowRgn((HRGN)rgnGrip.Detach(), FALSE);

		// subclass control
		::SetProp(m_wndGrip, RSZ_GRIP_OBJ,
			(HANDLE)::GetWindowLong(m_wndGrip, GWL_WNDPROC));
		::SetWindowLong(m_wndGrip, GWL_WNDPROC, (LONG)GripWindowProc);

		// update pos
		UpdateGripPos();
		ShowSizeGrip();
	}

	return bRet;
}

LRESULT CResizableGrip::GripWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	WNDPROC oldWndProc = (WNDPROC)::GetProp(hwnd, RSZ_GRIP_OBJ);

	switch (msg)
	{
	case WM_NCHITTEST:

		// choose proper cursor shape
		if (IsRTL(hwnd))
			return HTBOTTOMLEFT;
		else
			return HTBOTTOMRIGHT;

	case WM_DESTROY:
		
		// unsubclass
		::RemoveProp(hwnd, RSZ_GRIP_OBJ);
		::SetWindowLong(hwnd, GWL_WNDPROC, (LONG)oldWndProc);

		break;
	}

	return ::CallWindowProc(oldWndProc, hwnd, msg, wParam, lParam);
}

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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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