Cured DC/GDI object leak; listbox window proc restored from debugging

[wxWidgets.git] / src / msw / dcclient.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        dcclient.cpp
// Purpose:     wxClientDC class
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart and Markus Holzem
// Licence:   	wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "dcclient.h"
#endif

#ifdef __GNUG__
#pragma implementation
#pragma implementation "dcclient.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#endif

#include "wx/dcclient.h"

#include <windows.h>

#if !USE_SHARED_LIBRARY
IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxDC)
IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxDC)
#endif

wxClientDC::wxClientDC(void)
{
  m_canvas = NULL;
}

wxClientDC::wxClientDC(wxWindow *the_canvas)
{
  m_canvas = the_canvas;
//  BeginDrawing();
  m_hDC = (WXHDC) ::GetDC((HWND) the_canvas->GetHWND());
}

wxClientDC::~wxClientDC(void)
{
//  EndDrawing();

  if (m_canvas && (HDC) m_hDC)
  {
    SelectOldObjects(m_hDC);

    ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
	m_hDC = 0;
  }
}

wxWindowDC::wxWindowDC(void)
{
  m_canvas = NULL;
}

wxWindowDC::wxWindowDC(wxWindow *the_canvas)
{
  m_canvas = the_canvas;
//  m_hDC = (WXHDC) ::GetDCEx((HWND) the_canvas->GetHWND(), NULL, DCX_WINDOW);
  m_hDC = (WXHDC) ::GetWindowDC((HWND) the_canvas->GetHWND() );
  m_hDCCount ++;
}

wxWindowDC::~wxWindowDC(void)
{
  if (m_canvas && m_hDC)
  {
    SelectOldObjects(m_hDC);

    ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
	m_hDC = 0;
  }
  m_hDCCount --;
}

wxPaintDC::wxPaintDC(void)
{
  m_canvas = NULL;
}

static PAINTSTRUCT g_paintStruct;

// Don't call Begin/EndPaint if it's already been called:
// for example, if calling a base class OnPaint.

WXHDC wxPaintDC::m_staticPaintHDC = 0;
int wxPaintDC::m_staticPaintCount = 0;

wxPaintDC::wxPaintDC(wxWindow *the_canvas)
{
	if ( the_canvas && (m_staticPaintCount == 0))
	{
  		m_hDC = (WXHDC) ::BeginPaint((HWND) the_canvas->GetHWND(), &g_paintStruct);
  		m_hDCCount ++;
		m_staticPaintCount ++ ;
		m_staticPaintHDC = m_hDC ;
	}
	else
    {
        wxDebugMsg("wxPaintDC: Using existing HDC\n");
  		m_hDC = m_staticPaintHDC ;
    }

  m_canvas = the_canvas;
  RECT updateRect1 = g_paintStruct.rcPaint;
  m_canvas->m_updateRect.x = updateRect1.left;
  m_canvas->m_updateRect.y = updateRect1.top;
  m_canvas->m_updateRect.width = updateRect1.right - updateRect1.left;
  m_canvas->m_updateRect.height = updateRect1.bottom - updateRect1.top;
//  m_canvas->m_paintHDC = m_staticPaintHDC ;
}

wxPaintDC::~wxPaintDC(void)
{
	m_staticPaintCount -- ;

	if (m_staticPaintCount == 0)
	{
//  		m_canvas->m_paintHDC = 0;

		if ( m_hDC && m_canvas)
		{
  			::EndPaint((HWND) m_canvas->GetHWND(), &g_paintStruct);
  			m_hDCCount --;
			m_hDC = 0;
		}
        else
            wxDebugMsg("~wxPaintDC: Did not release HDC\n");

		m_staticPaintHDC = 0 ;
	}
    else
    {
        wxDebugMsg("~wxPaintDC: Did not release HDC\n");
    }
}