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124 lines
3.4 KiB
C++
124 lines
3.4 KiB
C++
#ifndef _MEMDC_H_
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#define _MEMDC_H_
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//////////////////////////////////////////////////
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// CMemDC - memory DC
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//
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// Author: Keith Rule
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// Email: keithr@europa.com
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// Copyright 1996-2002, Keith Rule
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//
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// You may freely use or modify this code provided this
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// Copyright is included in all derived versions.
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//
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// History - 10/3/97 Fixed scrolling bug.
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// Added print support. - KR
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//
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// 11/3/99 Fixed most common complaint. Added
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// background color fill. - KR
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//
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// 11/3/99 Added support for mapping modes other than
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// MM_TEXT as suggested by Lee Sang Hun. - KR
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//
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// 02/11/02 Added support for CScrollView as supplied
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// by Gary Kirkham. - KR
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//
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// This class implements a memory Device Context which allows
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// flicker free drawing.
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class CMemDC : public CDC
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{
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private:
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CBitmap m_bitmap; // Offscreen bitmap
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CBitmap* m_oldBitmap; // bitmap originally found in CMemDC
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CDC* m_pDC; // Saves CDC passed in constructor
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CRect m_rect; // Rectangle of drawing area.
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BOOL m_bMemDC; // TRUE if CDC really is a Memory DC.
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public:
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CMemDC(CDC* pDC, const CRect* pRect = NULL) : CDC()
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{
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ASSERT(pDC != NULL);
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// Some initialization
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m_pDC = pDC;
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m_oldBitmap = NULL;
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m_bMemDC = !pDC->IsPrinting();
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// Get the rectangle to draw
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if( pRect == NULL )
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{
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pDC->GetClipBox(&m_rect);
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}
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else
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{
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m_rect = *pRect;
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}
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if( m_bMemDC )
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{
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// Create a Memory DC
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CreateCompatibleDC(pDC);
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pDC->LPtoDP(&m_rect);
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m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(),
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m_rect.Height());
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m_oldBitmap = SelectObject(&m_bitmap);
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SetMapMode(pDC->GetMapMode());
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SetWindowExt(pDC->GetWindowExt());
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SetViewportExt(pDC->GetViewportExt());
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pDC->DPtoLP(&m_rect);
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SetWindowOrg(m_rect.left, m_rect.top);
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}
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else
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{
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// Make a copy of the relevent parts of the current
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// DC for printing
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m_bPrinting = pDC->m_bPrinting;
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m_hDC = pDC->m_hDC;
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m_hAttribDC = pDC->m_hAttribDC;
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}
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// Fill background
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FillSolidRect(m_rect, pDC->GetBkColor());
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}
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~CMemDC()
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{
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if (m_bMemDC)
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{
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// Copy the offscreen bitmap onto the screen.
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m_pDC->BitBlt(m_rect.left, m_rect.top,
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m_rect.Width(), m_rect.Height(),
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this, m_rect.left, m_rect.top, SRCCOPY);
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//Swap back the original bitmap.
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SelectObject(m_oldBitmap);
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}
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else
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{
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// All we need to do is replace the DC with an illegal
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// value, this keeps us from accidentally deleting the
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// handles associated with the CDC that was passed to
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// the constructor.
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m_hDC = m_hAttribDC = NULL;
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}
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}
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// Allow usage as a pointer
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CMemDC* operator->()
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{
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return this;
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}
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// Allow usage as a pointer
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operator CMemDC*()
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{
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return this;
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}
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};
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#endif
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