A null paint device that does nothing. More...

#include <qwt_null_paintdevice.h>

Inheritance diagram for QwtNullPaintDevice:

Classes
class	PaintEngine

class	PrivateData

Public Types
enum	Mode { NormalMode , PolygonPathMode , PathMode }
	Render mode for the paint device. More...

Public Member Functions
	QwtNullPaintDevice ()
	Constructor.

	~QwtNullPaintDevice () override
	Destructor.

void	setMode (Mode)
	Set the render mode.

Mode	mode () const
	Get the render mode.

virtual QPaintEngine *	paintEngine () const override
	Return the paint engine.

virtual int	metric (PaintDeviceMetric) const override
	Return metric information for the paint device.

virtual void	drawRects (const QRect *, int)
	Draw rectangles (integer version)

virtual void	drawRects (const QRectF *, int)
	Draw rectangles (floating point version)

virtual void	drawLines (const QLine *, int)
	Draw lines (integer version)

virtual void	drawLines (const QLineF *, int)
	Draw lines (floating point version)

virtual void	drawEllipse (const QRectF &)
	Draw ellipse (floating point version)

virtual void	drawEllipse (const QRect &)
	Draw ellipse (integer version)

virtual void	drawPath (const QPainterPath &)
	Draw a painter path.

virtual void	drawPoints (const QPointF *, int)
	Draw points (floating point version)

virtual void	drawPoints (const QPoint *, int)
	Draw points (integer version)

virtual void	drawPolygon (const QPointF *, int, QPaintEngine::PolygonDrawMode)
	Draw polygon (floating point version)

virtual void	drawPolygon (const QPoint *, int, QPaintEngine::PolygonDrawMode)
	Draw polygon (integer version)

virtual void	drawPixmap (const QRectF &, const QPixmap &, const QRectF &)
	Draw a pixmap.

virtual void	drawTextItem (const QPointF &, const QTextItem &)
	Draw a text item.

virtual void	drawTiledPixmap (const QRectF &, const QPixmap &, const QPointF &)
	Draw a tiled pixmap.

virtual void	drawImage (const QRectF &, const QImage &, const QRectF &, Qt::ImageConversionFlags)
	Draw an image.

virtual void	updateState (const QPaintEngineState &)
	Update the paint engine state.

Protected Member Functions
virtual QSize	sizeMetrics () const =0

Detailed Description

A null paint device that does nothing.

Sometimes important layout/rendering geometries are not available or changeable from the public Qt class interface (e.g., hidden in the style implementation). QwtNullPaintDevice can be used to manipulate or filter out this information by analyzing the stream of paint primitives. For example, QwtNullPaintDevice is used by QwtPlotCanvas to identify styled backgrounds with rounded corners.

Member Enumeration Documentation

◆ Mode

enum QwtNullPaintDevice::Mode

Render mode for the paint device.

Controls how vector graphic primitives are processed.

Enumerator
NormalMode	All vector graphic primitives are painted by corresponding draw methods.
PolygonPathMode	Vector graphic primitives (beside polygons) are mapped to QPainterPath.
PathMode	All vector graphic primitives are mapped to QPainterPath.

Member Function Documentation

◆ drawEllipse() [1/2]

void QwtNullPaintDevice::drawEllipse ( const QRect & rect )

virtual

Draw ellipse (integer version)

See QPaintEngine::drawEllipse()

◆ drawEllipse() [2/2]

void QwtNullPaintDevice::drawEllipse ( const QRectF & rect )

virtual

Draw ellipse (floating point version)

See QPaintEngine::drawEllipse()

◆ drawImage()

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

virtual

Draw an image.

See QPaintEngine::drawImage()

Reimplemented in QwtGraphic.

◆ drawLines() [1/2]

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

virtual

Draw lines (integer version)

See QPaintEngine::drawLines()

◆ drawLines() [2/2]

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

virtual

Draw lines (floating point version)

See QPaintEngine::drawLines()

◆ drawPath()

void QwtNullPaintDevice::drawPath ( const QPainterPath & path )

virtual

Draw a painter path.

See QPaintEngine::drawPath()

Reimplemented in QwtGraphic, and QwtStyleSheetRecorder.

◆ drawPixmap()

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

virtual

Draw a pixmap.

See QPaintEngine::drawPixmap()

Reimplemented in QwtGraphic.

◆ drawPoints() [1/2]

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

virtual

Draw points (integer version)

See QPaintEngine::drawPoints()

◆ drawPoints() [2/2]

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

virtual

Draw points (floating point version)

See QPaintEngine::drawPoints()

◆ drawPolygon() [1/2]

void QwtNullPaintDevice::drawPolygon	(	const QPoint *	points,
		int	pointCount,
		QPaintEngine::PolygonDrawMode	mode
	)

virtual

Draw polygon (integer version)

See QPaintEngine::drawPolygon()

◆ drawPolygon() [2/2]

void QwtNullPaintDevice::drawPolygon	(	const QPointF *	points,
		int	pointCount,
		QPaintEngine::PolygonDrawMode	mode
	)

virtual

Draw polygon (floating point version)

See QPaintEngine::drawPolygon()

◆ drawRects() [1/2]

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

virtual

Draw rectangles (integer version)

See QPaintEngine::drawRects()

Reimplemented in QwtStyleSheetRecorder.

◆ drawRects() [2/2]

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

virtual

Draw rectangles (floating point version)

See QPaintEngine::drawRects()

Reimplemented in QwtStyleSheetRecorder.

◆ drawTextItem()

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

virtual

Draw a text item.

See QPaintEngine::drawTextItem()

◆ drawTiledPixmap()

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

virtual

Draw a tiled pixmap.

See QPaintEngine::drawTiledPixmap()

◆ metric()

int QwtNullPaintDevice::metric ( PaintDeviceMetric deviceMetric ) const

overridevirtual

Return metric information for the paint device.

Returns information about the device metrics like width, height, DPI, etc. The actual size is determined by sizeMetrics().

Parameters

[in] deviceMetric Type of metric to query

Returns: Metric value for the given paint device metric

◆ mode()

QwtNullPaintDevice::Mode QwtNullPaintDevice::mode ( ) const

Get the render mode.

Returns: Current render mode

◆ paintEngine()

QPaintEngine * QwtNullPaintDevice::paintEngine ( ) const

overridevirtual

Return the paint engine.

Return the paint engine for this device.

Returns: Pointer to the paint engine, created on first call

◆ setMode()

void QwtNullPaintDevice::setMode ( Mode mode )

Set the render mode.

Parameters

[in] mode New mode for the paint device

◆ sizeMetrics()

virtual QSize QwtNullPaintDevice::sizeMetrics ( ) const

protectedpure virtual

Returns: Size needed to implement metric()

Implemented in QwtGraphic, and QwtStyleSheetRecorder.

◆ updateState()

void QwtNullPaintDevice::updateState ( const QPaintEngineState & state )

virtual

Update the paint engine state.

See QPaintEngine::updateState()

Reimplemented in QwtGraphic, and QwtStyleSheetRecorder.

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

/home/runner/work/QWT/QWT/src/plot/qwt_null_paintdevice.h
/home/runner/work/QWT/QWT/src/plot/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]

◆ drawPolygon() [1/2]

◆ drawPolygon() [2/2]

◆ drawRects() [1/2]

◆ drawRects() [2/2]

◆ drawTextItem()

◆ drawTiledPixmap()

◆ metric()

◆ mode()

◆ paintEngine()

◆ setMode()

◆ sizeMetrics()

◆ updateState()