81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
#if !defined(__TGMEMDC_H__)
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#define __TGMEMDC_H__
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class TGMemDC : public CDC
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{
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public:
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// constructor sets up the memory DC
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TGMemDC(CDC* pDC) : CDC()
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{
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ASSERT(pDC != NULL);
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m_pDC = pDC;
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m_pOldBitmap = NULL;
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#ifndef _WIN32_WCE_NO_PRINTING
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m_bMemDC = !pDC->IsPrinting();
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#else
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m_bMemDC = FALSE;
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#endif
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if (m_bMemDC) // Create a Memory DC
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{
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pDC->GetClipBox(&m_rect);
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CreateCompatibleDC(pDC);
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m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
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m_pOldBitmap = SelectObject(&m_bitmap);
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#ifndef _WIN32_WCE
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SetWindowOrg(m_rect.left, m_rect.top);
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#endif
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// EFW - Bug fix - Fill background in case the user has overridden
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// WM_ERASEBKGND. We end up with garbage otherwise.
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// CJM - moved to fix a bug in the fix.
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FillSolidRect(m_rect, pDC->GetBkColor());
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}
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else // Make a copy of the relevent parts of the current DC for printing
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{
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#if !defined(_WIN32_WCE) || ((_WIN32_WCE > 201) && !defined(_WIN32_WCE_NO_PRINTING))
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m_bPrinting = pDC->m_bPrinting;
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#endif
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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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}
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// Destructor copies the contents of the mem DC to the original DC
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~TGMemDC()
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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, 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_pOldBitmap);
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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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TGMemDC* operator->() {return this;}
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// Allow usage as a pointer
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operator TGMemDC*() {return this;}
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private:
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CBitmap m_bitmap; // Offscreen bitmap
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CBitmap* m_pOldBitmap; // bitmap originally found in TGMemDC
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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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};
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//{{AFX_INSERT_LOCATION}}
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#endif // !defined(__TGMEMDC_H__)
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