A null paint device doing nothing. More...

#include <qwt_null_paintdevice.h>

Inheritance diagram for QwtNullPaintDevice:

Public Types
enum	Mode { NormalMode , PolygonPathMode , PathMode }
	Render mode. More...

Public Member Functions
	QwtNullPaintDevice ()
	Constructor.

virtual	~QwtNullPaintDevice ()
	Destructor.

void	setMode (Mode)

Mode	mode () const

virtual QPaintEngine *	paintEngine () const override
	See QPaintDevice::paintEngine()

virtual int	metric (PaintDeviceMetric) const override

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()

Protected Member Functions
virtual QSize	sizeMetrics () const =0

Detailed Description

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.

Definition at line 32 of file qwt_null_paintdevice.h.

Member Enumeration Documentation

◆ Mode

enum QwtNullPaintDevice::Mode

Render mode.

See also: setMode(), mode()

Enumerator

NormalMode

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:

PathMode

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

Definition at line 40 of file qwt_null_paintdevice.h.

Member Function Documentation

◆ metric()

int QwtNullPaintDevice::metric ( PaintDeviceMetric deviceMetric ) const

overridevirtual

See QPaintDevice::metric()

Parameters

deviceMetric Type of metric

Returns: Metric information for the given paint device metric.

See also: sizeMetrics()

Definition at line 422 of file qwt_null_paintdevice.cpp.

◆ mode()

QwtNullPaintDevice::Mode QwtNullPaintDevice::mode ( ) const

Returns: Render mode

See also: setMode()

Definition at line 395 of file qwt_null_paintdevice.cpp.

◆ setMode()

void QwtNullPaintDevice::setMode ( Mode mode )

Set the render mode

Parameters

mode New mode

See also: mode()

Definition at line 386 of file qwt_null_paintdevice.cpp.

◆ sizeMetrics()

virtual QSize QwtNullPaintDevice::sizeMetrics ( ) const

protectedpure virtual

Returns: Size needed to implement metric()

Implemented in QwtGraphic.

Public Types

Public Member Functions

Protected Member Functions