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Posted 24 May 2000

CResizableDialog

, 25 Jul 2012
A CDialog derived class to implement resizable dialogs with MFC
// 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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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
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 (www.robotechsrl.com).

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

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