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| | | #if !defined(AFX_MEMDC_H__CA1D3541_7235_11D1_ABBA_00A0243D1382__INCLUDED_) |
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| | | #define AFX_MEMDC_H__CA1D3541_7235_11D1_ABBA_00A0243D1382__INCLUDED_ |
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| | | |
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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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| | | ////////////////////////////////////////////////// |
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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 1996-1997, 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. |
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| | | // 25 feb 98 - fixed minor assertion bug |
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| | | // |
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| | | // This class implements a memory Device Context |
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| | | |
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| | | class CMemDC : public CDC |
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| | | { |
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| | | public: |
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| | | |
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| | | // constructor sets up the memory DC |
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| | | CMemDC(CDC* pDC) : CDC() |
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| | | { |
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| | | ASSERT(pDC != NULL); |
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| | | |
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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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| | | |
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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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| | | } |
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| | | |
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| | | // Destructor copies the contents of the mem DC to the original DC |
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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, m_rect.Width(), m_rect.Height(), |
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| | | this, m_rect.left, m_rect.top, SRCCOPY); |
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| | | |
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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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| | | |
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| | | // Allow usage as a pointer |
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| | | CMemDC* operator->() {return this;} |
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| | | |
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| | | // Allow usage as a pointer |
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| | | operator CMemDC*() {return this;} |
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| | | |
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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 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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| | | }; |
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| | | |
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| | | ///////////////////////////////////////////////////////////////////////////// |
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| | | |
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| | | //{{AFX_INSERT_LOCATION}} |
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| | | // Microsoft Developer Studio will insert additional declarations immediately before the previous line. |
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| | | |
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| | | #endif // !defined(AFX_MEMDC_H__CA1D3541_7235_11D1_ABBA_00A0243D1382__INCLUDED_) |
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