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MemDC.h
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MemDC.h
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#if !defined(AFX_MEMDC_H__CA1D3541_7235_11D1_ABBA_00A0243D1382__INCLUDED_)
#define AFX_MEMDC_H__CA1D3541_7235_11D1_ABBA_00A0243D1382__INCLUDED_
#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000
// MemDC.h : header file
//
//////////////////////////////////////////////////
/// \brief CMemDC - This class implements a memory Device Context
///
/// \author Keith Rule - keithr@europa.com
///
/// Copyright 1996-1997, Keith Rule
///
/// You may freely use or modify this code provided this
/// Copyright is included in all derived versions.
///
/// \par History
/// - 10/3/97 Fixed scrolling bug.
/// Added print support.
/// - 25/2/98 Fixed minor assertion bug
///
///
//////////////////////////////////////////////////
class CMemDC : public CDC
{
public:
/**
* Constructor: set up the memory DC
*/
CMemDC(CDC* pDC) : CDC()
{
ASSERT(pDC != NULL);
m_pDC = pDC;
m_pOldBitmap = NULL;
#ifndef WCE_NO_PRINTING
m_bMemDC = !pDC->IsPrinting();
#else
m_bMemDC = FALSE;
#endif
if (m_bMemDC) // Create a Memory DC
{
pDC->GetClipBox(&m_rect);
CreateCompatibleDC(pDC);
m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
m_pOldBitmap = SelectObject(&m_bitmap);
#ifndef _WIN32_WCE
SetWindowOrg(m_rect.left, m_rect.top);
#endif
// EFW - Bug fix - Fill background in case the user has overridden
// WM_ERASEBKGND. We end up with garbage otherwise.
// CJM - moved to fix a bug in the fix.
FillSolidRect(m_rect, pDC->GetBkColor());
}
else // Make a copy of the relevent parts of the current DC for printing
{
#ifndef WCE_NO_PRINTING
m_bPrinting = pDC->m_bPrinting;
#endif
m_hDC = pDC->m_hDC;
m_hAttribDC = pDC->m_hAttribDC;
}
}
/**
* Destructor: copy the contents of the mem DC to the original DC
*/
~CMemDC()
{
if (m_bMemDC)
{
// Copy the offscreen bitmap onto the screen.
m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
this, m_rect.left, m_rect.top, SRCCOPY);
//TRACE( "CLIPS %d %d %d %d\n", m_rect.left,m_rect.top,m_rect.right,m_rect.bottom);
//Swap back the original bitmap.
SelectObject(m_pOldBitmap);
} else {
// All we need to do is replace the DC with an illegal value,
// this keeps us from accidently deleting the handles associated with
// the CDC that was passed to the constructor.
m_hDC = m_hAttribDC = NULL;
}
}
/**
* Allow usage as a pointer
*/
CMemDC* operator->() {return this;}
/**
* Allow usage as a pointer
*/
operator CMemDC*() {return this;}
private:
CBitmap m_bitmap; ///< Offscreen bitmap
CBitmap* m_pOldBitmap; ///< bitmap originally found in CMemDC
CDC* m_pDC; ///< Saves CDC passed in constructor
CRect m_rect; ///< Rectangle of drawing area.
BOOL m_bMemDC; ///< TRUE if CDC really is a Memory DC.
};
/////////////////////////////////////////////////////////////////////////////
//{{AFX_INSERT_LOCATION}}
// Microsoft Developer Studio will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_MEMDC_H__CA1D3541_7235_11D1_ABBA_00A0243D1382__INCLUDED_)