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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
//
//////////////////////////////////////////////////
// CMemDC - memory DC
//
// Author: Keith Rule
// Email: 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.
//
// History - 10/3/97 Fixed scrolling bug.
// Added print support.
// 25 feb 98 - fixed minor assertion bug
//
// This class implements a memory Device Context
class CMemDC : public CDC
{
public:
CMemDC(CDC* pDC, CRect wndRect) : CDC()
{
ASSERT(pDC != NULL);
m_pDC = pDC;
m_pOldBitmap = NULL;
m_bMemDC = !pDC->IsPrinting();
m_DstRect.SetRectEmpty();
if (m_bMemDC) // Create a Memory DC
{
m_rect = wndRect;
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
}
else // Make a copy of the relevent parts of the current DC for printing
{
#ifndef _WIN32_WCE
m_bPrinting = pDC->m_bPrinting;
#endif
m_hDC = pDC->m_hDC;
m_hAttribDC = pDC->m_hAttribDC;
}
FillSolidRect(m_rect, pDC->GetBkColor());
};
// constructor sets up the memory DC
CMemDC(CDC* pDC, int nOffset = 0) : CDC()
{
ASSERT(pDC != NULL);
m_pDC = pDC;
m_pOldBitmap = NULL;
m_bMemDC = !pDC->IsPrinting();
m_DstRect.SetRectEmpty();
if (m_bMemDC) // Create a Memory DC
{
pDC->GetClipBox(&m_rect);
CreateCompatibleDC(pDC);
m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width() - nOffset, m_rect.Height());
m_pOldBitmap = SelectObject(&m_bitmap);
#ifndef _WIN32_WCE
SetWindowOrg(m_rect.left, m_rect.top);
#endif
}
else // Make a copy of the relevent parts of the current DC for printing
{
#ifndef _WIN32_WCE
m_bPrinting = pDC->m_bPrinting;
#endif
m_hDC = pDC->m_hDC;
m_hAttribDC = pDC->m_hAttribDC;
}
FillSolidRect(m_rect, pDC->GetBkColor());
}
CMemDC(CDC* pDC, CRect DstRect, CRect wndRect) : CDC()
{
ASSERT(pDC != NULL);
m_pDC = pDC;
m_pOldBitmap = NULL;
m_bMemDC = !pDC->IsPrinting();
m_rect = wndRect;
m_DstRect = DstRect;
if (m_bMemDC) // Create a Memory DC
{
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
}
else // Make a copy of the relevent parts of the current DC for printing
{
#ifndef _WIN32_WCE
m_bPrinting = pDC->m_bPrinting;
#endif
m_hDC = pDC->m_hDC;
m_hAttribDC = pDC->m_hAttribDC;
}
FillSolidRect(m_rect, pDC->GetBkColor());
}
// Destructor copies the contents of the mem DC to the original DC
~CMemDC()
{
if (m_bMemDC) {
if (!m_DstRect.IsRectEmpty())
m_pDC->BitBlt(m_DstRect.left, m_DstRect.top, m_DstRect.Width(), m_DstRect.Height(),
this, m_DstRect.left, m_DstRect.top, SRCCOPY);
else
// 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);
//Swap back the original bitmap.
SelectObject(m_pOldBitmap);
m_bitmap.DeleteObject();
} 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.
CRect m_DstRect;
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_)
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