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e8c7e30030
- Painting the canvas is done by overlaying the multiple layers. - Drawing each overlay is implemented as polymorphism of OOP. - Refine the Undo/Redo mechanism. - Some adjustments. CORE-17969
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
/*
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* PROJECT: PAINT for ReactOS
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* LICENSE: LGPL
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* FILE: base/applications/mspaint/history.h
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* PURPOSE: Undo and redo functionality
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* PROGRAMMERS: Benedikt Freisen
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*/
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#pragma once
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/* HISTORYSIZE = number of possible undo-steps + 1 */
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#define HISTORYSIZE 11
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class ImageModel
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{
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public:
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ImageModel();
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virtual ~ImageModel();
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HDC GetDC();
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BOOL CanUndo() const { return m_undoSteps > 0; }
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BOOL CanRedo() const { return m_redoSteps > 0; }
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void PushImageForUndo(HBITMAP hbm = NULL);
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void ResetToPrevious(void);
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void Undo(BOOL bClearRedo = FALSE);
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void Redo(void);
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void ClearHistory(void);
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void Crop(int nWidth, int nHeight, int nOffsetX = 0, int nOffsetY = 0);
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void SaveImage(LPCTSTR lpFileName);
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BOOL IsImageSaved() const;
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void StretchSkew(int nStretchPercentX, int nStretchPercentY, int nSkewDegX = 0, int nSkewDegY = 0);
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int GetWidth() const;
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int GetHeight() const;
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HBITMAP CopyBitmap();
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void InvertColors();
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void FlipHorizontally();
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void FlipVertically();
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void RotateNTimes90Degrees(int iN);
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void Bound(POINT& pt) const;
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void NotifyImageChanged();
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protected:
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HDC m_hDrawingDC; // The device context for this class
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int m_currInd; // The current index in m_hBms
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int m_undoSteps; // The undo-able count
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int m_redoSteps; // The redo-able count
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HBITMAP m_hBms[HISTORYSIZE]; // A rotation buffer of HBITMAPs
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HGDIOBJ m_hbmOld;
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};
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