A null paint device doing nothing. More...

#include <qwt_null_paintdevice.h>

Inheritance diagram for QwtNullPaintDevice:

Classes
class	PrivateData

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

Public Member Functions
	QwtNullPaintDevice ()
	Constructor.

virtual	~QwtNullPaintDevice ()
	Destructor.

void	setMode (Mode)
	Set the render mode.

Mode	mode () const

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

virtual int	metric (PaintDeviceMetric) const QWT_OVERRIDE
	See QPaintDevice::metric()

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.

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:

Member Function Documentation

◆ drawEllipse() [1/2]

void QwtNullPaintDevice::drawEllipse ( const QRect & rect )

virtual

See QPaintEngine::drawEllipse()

Reimplemented in QWT_FINAL.

◆ drawEllipse() [2/2]

void QwtNullPaintDevice::drawEllipse ( const QRectF & rect )

virtual

See QPaintEngine::drawEllipse()

Reimplemented in QWT_FINAL.

◆ drawImage()

void QwtNullPaintDevice::drawImage	(	const QRectF &	rect,
		const QImage &	image,
		const QRectF &	subRect,
		Qt::ImageConversionFlags	flags
	)

virtual

See QPaintEngine::drawImage()

Reimplemented in QwtGraphic, and QWT_FINAL.

◆ drawLines() [1/2]

void QwtNullPaintDevice::drawLines	(	const QLine *	lines,
		int	lineCount
	)

virtual

See QPaintEngine::drawLines()

Reimplemented in QWT_FINAL.

◆ drawLines() [2/2]

void QwtNullPaintDevice::drawLines	(	const QLineF *	lines,
		int	lineCount
	)

virtual

See QPaintEngine::drawLines()

Reimplemented in QWT_FINAL.

◆ drawPath()

void QwtNullPaintDevice::drawPath ( const QPainterPath & path )

virtual

See QPaintEngine::drawPath()

Reimplemented in QwtGraphic, QWT_FINAL, and QWT_FINAL.

◆ drawPixmap()

void QwtNullPaintDevice::drawPixmap	(	const QRectF &	rect,
		const QPixmap &	pm,
		const QRectF &	subRect
	)

virtual

See QPaintEngine::drawPixmap()

Reimplemented in QwtGraphic, and QWT_FINAL.

◆ drawPoints() [1/2]

void QwtNullPaintDevice::drawPoints	(	const QPoint *	points,
		int	pointCount
	)

virtual

See QPaintEngine::drawPoints()

Reimplemented in QWT_FINAL.

◆ drawPoints() [2/2]

void QwtNullPaintDevice::drawPoints	(	const QPointF *	points,
		int	pointCount
	)

virtual

See QPaintEngine::drawPoints()

Reimplemented in QWT_FINAL.

◆ drawRects() [1/2]

void QwtNullPaintDevice::drawRects	(	const QRect *	rects,
		int	rectCount
	)

virtual

See QPaintEngine::drawRects()

Reimplemented in QWT_FINAL, and QWT_FINAL.

◆ drawRects() [2/2]

void QwtNullPaintDevice::drawRects	(	const QRectF *	rects,
		int	rectCount
	)

virtual

See QPaintEngine::drawRects()

Reimplemented in QWT_FINAL, and QWT_FINAL.

◆ drawTextItem()

void QwtNullPaintDevice::drawTextItem	(	const QPointF &	pos,
		const QTextItem &	textItem
	)

virtual

See QPaintEngine::drawTextItem()

Reimplemented in QWT_FINAL.

◆ drawTiledPixmap()

void QwtNullPaintDevice::drawTiledPixmap	(	const QRectF &	rect,
		const QPixmap &	pixmap,
		const QPointF &	subRect
	)

virtual

See QPaintEngine::drawTiledPixmap()

Reimplemented in QWT_FINAL.

◆ metric()

int QwtNullPaintDevice::metric ( PaintDeviceMetric deviceMetric ) const

virtual

See QPaintDevice::metric()

Parameters

deviceMetric Type of metric

Returns: Metric information for the given paint device metric.

See also: sizeMetrics()

◆ mode()

QwtNullPaintDevice::Mode QwtNullPaintDevice::mode ( ) const

Returns: Render mode

See also: setMode()

◆ setMode()

void QwtNullPaintDevice::setMode ( Mode mode )

Set the render mode.

Parameters

mode New mode

See also: mode()

◆ sizeMetrics()

virtual QSize QwtNullPaintDevice::sizeMetrics ( ) const

protectedpure virtual

Returns: Size needed to implement metric()

Implemented in QwtGraphic, and QWT_FINAL.

◆ updateState()

void QwtNullPaintDevice::updateState ( const QPaintEngineState & state )

virtual

See QPaintEngine::updateState()

Reimplemented in QwtGraphic, QWT_FINAL, and QWT_FINAL.

The documentation for this class was generated from the following files:

/home/runner/work/QWT/QWT/src/qwt_null_paintdevice.h
/home/runner/work/QWT/QWT/src/qwt_null_paintdevice.cpp

Classes

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Enumeration Documentation

◆ Mode

Member Function Documentation

◆ drawEllipse() [1/2]

◆ drawEllipse() [2/2]

◆ drawImage()

◆ drawLines() [1/2]

◆ drawLines() [2/2]

◆ drawPath()

◆ drawPixmap()

◆ drawPoints() [1/2]

◆ drawPoints() [2/2]

◆ drawRects() [1/2]

◆ drawRects() [2/2]

◆ drawTextItem()

◆ drawTiledPixmap()

◆ metric()

◆ mode()

◆ setMode()

◆ sizeMetrics()

◆ updateState()