1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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2 | * Qwt Widget Library
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3 | * Copyright (C) 1997 Josef Wilgen
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4 | * Copyright (C) 2002 Uwe Rathmann
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the Qwt License, Version 1.0
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8 | *****************************************************************************/
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9 |
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10 | #ifndef QWT_PAINT_BUFFER_H
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11 | #define QWT_PAINT_BUFFER_H 1
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12 |
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13 | #include <qglobal.h>
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14 | #if QT_VERSION < 0x040000
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15 |
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16 | #include <qpixmap.h>
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17 | #include "qwt_global.h"
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18 |
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19 | class QPainter;
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20 |
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21 | /*!
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22 | \brief Paint buffer for Qwt widgets
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23 |
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24 | QwtPaintBuffer offers a simple way to en/disable double buffering.
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25 | Double buffering is enabled as default and in general there will be
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26 | no reason to change this.
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27 | */
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28 |
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29 | class QWT_EXPORT QwtPaintBuffer
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30 | {
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31 | public:
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32 | explicit QwtPaintBuffer();
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33 | explicit QwtPaintBuffer(QPaintDevice *, const QRect &, QPainter *p = NULL);
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34 |
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35 | virtual ~QwtPaintBuffer();
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36 |
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37 | void open(QPaintDevice *, const QRect &, QPainter *p = NULL);
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38 | void close();
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39 |
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40 | QPainter *painter();
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41 | const QPaintDevice *device();
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42 |
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43 | static void setEnabled(bool enable);
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44 | static bool isEnabled();
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45 |
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46 | //! Return Buffer used for double buffering
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47 | const QPixmap &buffer() const { return d_pixBuffer; }
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48 |
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49 | protected:
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50 | void flush();
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51 |
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52 | private:
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53 | QPixmap d_pixBuffer;
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54 | QRect d_rect;
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55 |
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56 | QPaintDevice *d_device; // use QGuardedPtr
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57 | QPainter *d_painter; // use QGuardedPtr
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58 | QPainter *d_devicePainter; // use QGuardedPtr
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59 |
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60 | static bool d_enabled;
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61 | };
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62 |
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63 | #endif // QT_VERSION < 0x040000
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64 |
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65 | #endif
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