#if !defined(CControlMemDC__INCLUDED_)
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#define CControlMemDC__INCLUDED_
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#if _MSC_VER > 1000
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#pragma once
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#endif // _MSC_VER > 1000
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// MemDC.h : header file
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//
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/////////////////////////////////////////////////////////////////////////////
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// CMemDC window
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class CControlMemDC : public CDC {
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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 CControlMemDC
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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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CControlMemDC(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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pDC->GetClipBox(&m_rect);
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} else {
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m_rect = *pRect;
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}
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if (m_bMemDC) {
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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(), 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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} else {
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// Make a copy of the relevent parts of the current 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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~CControlMemDC()
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{
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if (m_bMemDC) {
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// Copy the offscreen bitmap onto the screen.
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m_pDC->BitBlt(m_rect.left, m_rect.top, 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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} else {
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// All we need to do is replace the DC with an illegal value,
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// this keeps us from accidently deleting the handles associated with
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// the CDC that was passed to 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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CControlMemDC* 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 CControlMemDC*()
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{
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return this;
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}
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CDC *GetOriginalDC()
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{
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return m_pDC;
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}
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};
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/////////////////////////////////////////////////////////////////////////////
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//{{AFX_INSERT_LOCATION}}
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// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
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#endif // !defined(AFX_MEMDC_H__18BA4DAB_63FC_4FFA_83B0_2AFF3EDF0420__INCLUDED_)
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