127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#ifndef QWT_NULL_PAINT_DEVICE_H
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#define QWT_NULL_PAINT_DEVICE_H 1
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#include "qwt_global.h"
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#include <qpaintdevice.h>
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#include <qpaintengine.h>
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/*!
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\brief A null paint device doing nothing
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Sometimes important layout/rendering geometries are not
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available or changeable from the public Qt class interface.
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( f.e hidden in the style implementation ).
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QwtNullPaintDevice can be used to manipulate or filter out
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this information by analyzing the stream of paint primitives.
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F.e. QwtNullPaintDevice is used by QwtPlotCanvas to identify
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styled backgrounds with rounded corners.
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*/
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class QWT_EXPORT QwtNullPaintDevice: public QPaintDevice
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{
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public:
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/*!
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\brief Render mode
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\sa setMode(), mode()
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*/
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enum Mode
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{
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/*!
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All vector graphic primitives are painted by
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the corresponding draw methods
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*/
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NormalMode,
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/*!
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Vector graphic primitives ( beside polygons ) are mapped to a QPainterPath
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and are painted by drawPath. In PathMode mode
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only a few draw methods are called:
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- drawPath()
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- drawPixmap()
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- drawImage()
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- drawPolygon()
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*/
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PolygonPathMode,
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/*!
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Vector graphic primitives are mapped to a QPainterPath
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and are painted by drawPath. In PathMode mode
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only a few draw methods are called:
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- drawPath()
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- drawPixmap()
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- drawImage()
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*/
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PathMode
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};
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QwtNullPaintDevice();
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virtual ~QwtNullPaintDevice();
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void setMode( Mode );
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Mode mode() const;
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virtual QPaintEngine *paintEngine() const;
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virtual int metric( PaintDeviceMetric ) const;
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virtual void drawRects(const QRect *, int );
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virtual void drawRects(const QRectF *, int );
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virtual void drawLines(const QLine *, int );
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virtual void drawLines(const QLineF *, int );
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virtual void drawEllipse(const QRectF &);
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virtual void drawEllipse(const QRect &);
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virtual void drawPath(const QPainterPath &);
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virtual void drawPoints(const QPointF *, int );
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virtual void drawPoints(const QPoint *, int );
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virtual void drawPolygon(
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const QPointF *, int , QPaintEngine::PolygonDrawMode );
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virtual void drawPolygon(
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const QPoint *, int , QPaintEngine::PolygonDrawMode );
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virtual void drawPixmap(const QRectF &,
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const QPixmap &, const QRectF &);
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virtual void drawTextItem(const QPointF &, const QTextItem &);
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virtual void drawTiledPixmap(const QRectF &,
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const QPixmap &, const QPointF & );
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virtual void drawImage(const QRectF &,
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const QImage &, const QRectF &, Qt::ImageConversionFlags );
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virtual void updateState( const QPaintEngineState & );
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protected:
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//! \return Size needed to implement metric()
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virtual QSize sizeMetrics() const = 0;
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private:
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class PaintEngine;
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PaintEngine *d_engine;
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class PrivateData;
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PrivateData *d_data;
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};
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#endif
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