QwtNullPaintDevice Class Reference

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: 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()

Definition at line 40 of file qwt_null_paintdevice.h.

Constructor & Destructor Documentation

QwtNullPaintDevice()

QwtNullPaintDevice::QwtNullPaintDevice

(

)

Constructor.

Definition at line 367 of file qwt_null_paintdevice.cpp.

~QwtNullPaintDevice()

QwtNullPaintDevice::~QwtNullPaintDevice ( )

virtual

Destructor.

Definition at line 374 of file qwt_null_paintdevice.cpp.

Member Function Documentation

drawEllipse() [1/2]

void QwtNullPaintDevice::drawEllipse ( const QRect & rect )

virtual

See QPaintEngine::drawEllipse()

Definition at line 521 of file qwt_null_paintdevice.cpp.

drawEllipse() [2/2]

void QwtNullPaintDevice::drawEllipse ( const QRectF & rect )

virtual

See QPaintEngine::drawEllipse()

Definition at line 515 of file qwt_null_paintdevice.cpp.

drawImage()

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

virtual

See QPaintEngine::drawImage()

Reimplemented in QwtGraphic.

Definition at line 596 of file qwt_null_paintdevice.cpp.

drawLines() [1/2]

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

virtual

See QPaintEngine::drawLines()

Definition at line 499 of file qwt_null_paintdevice.cpp.

drawLines() [2/2]

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

virtual

See QPaintEngine::drawLines()

Definition at line 507 of file qwt_null_paintdevice.cpp.

drawPath()

void QwtNullPaintDevice::drawPath ( const QPainterPath & path )

virtual

See QPaintEngine::drawPath()

Reimplemented in QwtGraphic.

Definition at line 527 of file qwt_null_paintdevice.cpp.

drawPixmap()

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

virtual

See QPaintEngine::drawPixmap()

Reimplemented in QwtGraphic.

Definition at line 569 of file qwt_null_paintdevice.cpp.

drawPoints() [1/2]

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

virtual

See QPaintEngine::drawPoints()

Definition at line 541 of file qwt_null_paintdevice.cpp.

drawPoints() [2/2]

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

virtual

See QPaintEngine::drawPoints()

Definition at line 533 of file qwt_null_paintdevice.cpp.

drawPolygon() [1/2]

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

virtual

See QPaintEngine::drawPolygon()

Definition at line 559 of file qwt_null_paintdevice.cpp.

drawPolygon() [2/2]

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

virtual

See QPaintEngine::drawPolygon()

Definition at line 549 of file qwt_null_paintdevice.cpp.

drawRects() [1/2]

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

virtual

See QPaintEngine::drawRects()

Definition at line 483 of file qwt_null_paintdevice.cpp.

drawRects() [2/2]

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

virtual

See QPaintEngine::drawRects()

Definition at line 491 of file qwt_null_paintdevice.cpp.

drawTextItem()

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

virtual

See QPaintEngine::drawTextItem()

Definition at line 578 of file qwt_null_paintdevice.cpp.

drawTiledPixmap()

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

virtual

See QPaintEngine::drawTiledPixmap()

Definition at line 586 of file qwt_null_paintdevice.cpp.

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.

paintEngine()

QPaintEngine * QwtNullPaintDevice::paintEngine ( ) const

overridevirtual

See QPaintDevice::paintEngine()

Definition at line 401 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.

updateState()

void QwtNullPaintDevice::updateState ( const QPaintEngineState & state )

virtual

See QPaintEngine::updateState()

Reimplemented in QwtGraphic.

Definition at line 607 of file qwt_null_paintdevice.cpp.