QwtNullPaintDevice - A null paint device doing nothing.

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Version 6.1.4                                    Wed Jan 2 2019                            QwtNullPaintDevice(3)

       A null paint device doing nothing.

       Sometimes important layout/rendering geometries are not available or changeable from the public Qt class
       interface. ( f.e hidden in the style implementation ).

       QwtNullPaintDevice can be used to manipulate or filter out this information by analyzing the stream of
       paint primitives.

       F.e. QwtNullPaintDevice is used by QwtPlotCanvas to identify styled backgrounds with rounded corners.

enumQwtNullPaintDevice::Mode
       Render mode.

       Seealso:setMode(), mode()EnumeratorNormalMode
              All vector graphic primitives are painted by the corresponding draw methods

       PolygonPathMode
              Vector  graphic  primitives  (  beside  polygons ) are mapped to a QPainterPath and are painted by
              drawPath. In PathMode mode only a few draw methods are called:

       • drawPath()

       • drawPixmap()

       • drawImage()

       • drawPolygon()PathMode
              Vector graphic primitives are mapped to a QPainterPath and are painted by  drawPath.  In  PathMode
              mode only a few draw methods are called:

       • drawPath()

       • drawPixmap()

       • drawImage()

intQwtNullPaintDevice::metric(PaintDeviceMetricdeviceMetric)const[virtual]
       See QPaintDevice::metric()

       Parameters:deviceMetric Type of metric

       Returns:
           Metric information for the given paint device metric.

       Seealso:sizeMetrics()QwtNullPaintDevice::ModeQwtNullPaintDevice::mode()constReturns:
           Render mode

       Seealso:setMode()voidQwtNullPaintDevice::setMode(Modemode)
       Set the render mode

       Parameters:mode New mode

       Seealso:mode()virtualQSizeQwtNullPaintDevice::sizeMetrics()const[protected],[purevirtual]Returns:
           Size needed to implement metric()

       Implemented in QwtGraphic.

       QwtNullPaintDevice - A null paint device doing nothing.

       #include <qwt_null_paintdevice.h>

       Inherits QPaintDevice.

       Inherited by QwtGraphic, and QwtStyleSheetRecorder.

   PublicTypes
       enum Mode { NormalMode, PolygonPathMode, PathMode }
           Render mode.

   PublicMemberFunctionsQwtNullPaintDevice ()
           Constructor.
       virtual ~QwtNullPaintDevice ()
           Destructor.
       void setMode (Mode)
       Modemode () const
       virtual QPaintEngine * paintEngine () const
           See QPaintDevice::paintEngine()
       virtual int metric (PaintDeviceMetric) const
       virtual void drawRects (const QRect *, int)
           See QPaintEngine::drawRects()
       virtual void drawRects (const QRectF *, int)
           See QPaintEngine::drawRects()
       virtual void drawLines (const QLine *, int)
           See QPaintEngine::drawLines()
       virtual void drawLines (const QLineF *, int)
           See QPaintEngine::drawLines()
       virtual void drawEllipse (const QRectF &)
           See QPaintEngine::drawEllipse()
       virtual void drawEllipse (const QRect &)
           See QPaintEngine::drawEllipse()
       virtual void drawPath (const QPainterPath &)
           See QPaintEngine::drawPath()
       virtual void drawPoints (const QPointF *, int)
           See QPaintEngine::drawPoints()
       virtual void drawPoints (const QPoint *, int)
           See QPaintEngine::drawPoints()
       virtual void drawPolygon (const QPointF *, int, QPaintEngine::PolygonDrawMode)
           See QPaintEngine::drawPolygon()
       virtual void drawPolygon (const QPoint *, int, QPaintEngine::PolygonDrawMode)
           See QPaintEngine::drawPolygon()
       virtual void drawPixmap (const QRectF &, const QPixmap &, const QRectF &)
           See QPaintEngine::drawPixmap()
       virtual void drawTextItem (const QPointF &, const QTextItem &)
           See QPaintEngine::drawTextItem()
       virtual void drawTiledPixmap (const QRectF &, const QPixmap &, const QPointF &)
           See QPaintEngine::drawTiledPixmap()
       virtual void drawImage (const QRectF &, const QImage &, const QRectF &, Qt::ImageConversionFlags)
           See QPaintEngine::drawImage()
       virtual void updateState (const QPaintEngineState &)
           See QPaintEngine::updateState()

   ProtectedMemberFunctions
       virtual QSize sizeMetrics () const =0