| 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_NULL_PAINT_DEVICE_H
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| 11 | #define QWT_NULL_PAINT_DEVICE_H 1
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| 12 |
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| 13 | #include "qwt_global.h"
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| 14 | #include <qpaintdevice.h>
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| 15 | #include <qpaintengine.h>
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| 16 |
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| 17 | /*!
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| 18 | \brief A null paint device doing nothing
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| 19 |
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| 20 | Sometimes important layout/rendering geometries are not
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| 21 | available or changeable from the public Qt class interface.
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| 22 | ( f.e hidden in the style implementation ).
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| 23 |
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| 24 | QwtNullPaintDevice can be used to manipulate or filter out
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| 25 | this information by analyzing the stream of paint primitives.
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| 26 |
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| 27 | F.e. QwtNullPaintDevice is used by QwtPlotCanvas to identify
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| 28 | styled backgrounds with rounded corners.
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| 29 | */
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| 30 |
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| 31 | class QWT_EXPORT QwtNullPaintDevice: public QPaintDevice
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| 32 | {
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| 33 | public:
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| 34 | /*!
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| 35 | \brief Render mode
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| 36 |
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| 37 | \sa setMode(), mode()
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| 38 | */
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| 39 | enum Mode
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| 40 | {
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| 41 | /*!
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| 42 | All vector graphic primitives are painted by
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| 43 | the corresponding draw methods
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| 44 | */
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| 45 | NormalMode,
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| 46 |
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| 47 | /*!
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| 48 | Vector graphic primitives ( beside polygons ) are mapped to a QPainterPath
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| 49 | and are painted by drawPath. In PathMode mode
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| 50 | only a few draw methods are called:
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| 51 |
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| 52 | - drawPath()
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| 53 | - drawPixmap()
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| 54 | - drawImage()
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| 55 | - drawPolygon()
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| 56 | */
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| 57 | PolygonPathMode,
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| 58 |
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| 59 | /*!
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| 60 | Vector graphic primitives are mapped to a QPainterPath
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| 61 | and are painted by drawPath. In PathMode mode
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| 62 | only a few draw methods are called:
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| 63 |
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| 64 | - drawPath()
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| 65 | - drawPixmap()
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| 66 | - drawImage()
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| 67 | */
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| 68 | PathMode
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| 69 | };
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| 70 |
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| 71 | QwtNullPaintDevice();
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| 72 | virtual ~QwtNullPaintDevice();
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| 73 |
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| 74 | void setMode( Mode );
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| 75 | Mode mode() const;
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| 76 |
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| 77 | virtual QPaintEngine *paintEngine() const;
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| 78 |
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| 79 | virtual int metric( PaintDeviceMetric ) const;
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| 80 |
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| 81 | virtual void drawRects(const QRect *, int );
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| 82 | virtual void drawRects(const QRectF *, int );
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| 83 |
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| 84 | virtual void drawLines(const QLine *, int );
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| 85 | virtual void drawLines(const QLineF *, int );
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| 86 |
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| 87 | virtual void drawEllipse(const QRectF &);
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| 88 | virtual void drawEllipse(const QRect &);
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| 89 |
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| 90 | virtual void drawPath(const QPainterPath &);
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| 91 |
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| 92 | virtual void drawPoints(const QPointF *, int );
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| 93 | virtual void drawPoints(const QPoint *, int );
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| 94 |
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| 95 | virtual void drawPolygon(
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| 96 | const QPointF *, int , QPaintEngine::PolygonDrawMode );
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| 97 |
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| 98 | virtual void drawPolygon(
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| 99 | const QPoint *, int , QPaintEngine::PolygonDrawMode );
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| 100 |
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| 101 | virtual void drawPixmap(const QRectF &,
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| 102 | const QPixmap &, const QRectF &);
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| 103 |
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| 104 | virtual void drawTextItem(const QPointF &, const QTextItem &);
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| 105 |
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| 106 | virtual void drawTiledPixmap(const QRectF &,
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| 107 | const QPixmap &, const QPointF & );
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| 108 |
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| 109 | virtual void drawImage(const QRectF &,
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| 110 | const QImage &, const QRectF &, Qt::ImageConversionFlags );
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| 111 |
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| 112 | virtual void updateState( const QPaintEngineState & );
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| 113 |
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| 114 | protected:
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| 115 | //! \return Size needed to implement metric()
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| 116 | virtual QSize sizeMetrics() const = 0;
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| 117 |
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| 118 | private:
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| 119 | class PaintEngine;
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| 120 | PaintEngine *d_engine;
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| 121 |
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| 122 | class PrivateData;
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| 123 | PrivateData *d_data;
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| 124 | };
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| 125 |
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| 126 | #endif
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