Svg Class Reference

from PyKDE4.plasma import *

Inherits: QObject
Subclasses: Plasma.FrameSvg
Namespace: Plasma

Detailed Description

Svg plasma/svg.h <Plasma/Svg>

A theme aware image-centric SVG class

Plasma.Svg provides a class for rendering SVG images to a QPainter in a convenient manner. Unless an absolute path to a file is provided, it loads the SVG document using Plasma.Theme. It also provides a number of internal optimizations to help lower the cost of painting SVGs, such as caching.

See also:: Plasma.FrameSvg

Signals
	repaintNeeded ()
	sizeChanged ()
Methods
	__init__ (self, QObject parent=0)
bool	containsMultipleImages (self)
QString	elementAtPoint (self, QPoint point)
QRectF	elementRect (self, QString elementId)
QSize	elementSize (self, QString elementId)
bool	hasElement (self, QString elementId)
QString	imagePath (self)
bool	isUsingRenderingCache (self)
bool	isValid (self)
	paint (self, QPainter painter, QPointF point, QString elementID=QString())
	paint (self, QPainter painter, int x, int y, QString elementID=QString())
	paint (self, QPainter painter, QRectF rect, QString elementID=QString())
	paint (self, QPainter painter, int x, int y, int width, int height, QString elementID=QString())
QPixmap	pixmap (self, QString elementID=QString())
	resize (self, float width, float height)
	resize (self, QSizeF size)
	resize (self)
	setContainsMultipleImages (self, bool multiple)
	setImagePath (self, QString svgFilePath)
	setTheme (self, Plasma.Theme theme)
	setUsingRenderingCache (self, bool useCache)
QSize	size (self)
Plasma.Theme	theme (self)

Signal Documentation

repaintNeeded ( )

Emitted whenever the SVG data has changed in such a way that a repaint is required. Any usage of an Svg object that does the painting itself must connect to this signal and respond by updating the painting. Note that connected to Theme.themeChanged is incorrect in such a use case as the Svg itself may not be updated yet nor may theme change be the only case when a repaint is needed. Also note that classes or QML code which take Svg objects as parameters for their own painting all respond to this signal so that in those cases manually responding to the signal is unnecessary; ONLY when direct, manual painting with an Svg object is done in application code is this signal used.

Signal syntax:: QObject.connect(source, SIGNAL("repaintNeeded()"), target_slot)

sizeChanged ( )

Emitted whenever the size of the Svg is changed.

See also:: resize()

Signal syntax:: QObject.connect(source, SIGNAL("sizeChanged()"), target_slot)

Method Documentation

__init__	(	self,
		QObject	parent=0
	)

Constructs an SVG object that implicitly shares and caches rendering.

Unlike QSvgRenderer, which this class uses internally, Plasma.Svg represents an image generated from an SVG. As such, it has a related size and transform matrix (the latter being provided by the painter used to paint the image).

The size is initialized to be the SVG's native size.

Parameters:

parent

options QObject to parent this to

@related Plasma.Theme

bool containsMultipleImages ( self )

Whether the SVG contains multiple images.

If this is true, the SVG will be treated as a collection of related images, rather than a consistent drawing.

Returns:: true if the SVG will be treated as containing multiple images, false if it will be treated as a coherent image.

QString elementAtPoint	(	self,
		QPoint	point
	)

Returns the element (by id) at the given point.

An empty string is returned if there no element is at point.

NOTE: not implemented! This will currently return an empty string!

Parameters:

point

a point in SVG co-ordinates

Returns:: an empty string

QRectF elementRect	(	self,
		QString	elementId
	)

The bounding rect of a given element.

This is the bounding rect of the element with ID elementId after the SVG has been scaled (see resize()). Note that this is unaffected by the containsMultipleImages property.

Parameters:

elementId

the id of the element to check

Returns:: the current rect of a given element, given the current size of the SVG

QSize elementSize	(	self,
		QString	elementId
	)

Find the size of a given element.

This is the size of the element with ID elementId after the SVG has been scaled (see resize()). Note that this is unaffected by the containsMultipleImages property.

Parameters:

elementId

the id of the element to check

Returns:: the size of a given element, given the current size of the SVG

bool hasElement	(	self,
		QString	elementId
	)

Check whether an element exists in the loaded SVG.

Parameters:

elementId

the id of the element to check for

Returns:: true if the element is defined in the SVG, otherwise false

QString imagePath ( self )

The SVG file to render.

If this SVG is themed, this will be a relative path, and will not include a file extension.

Returns:: either an absolute path to an SVG file, or an image name

See also:: Theme.imagePath()

bool isUsingRenderingCache ( self )

Whether the rendering cache is being used.

Returns:: true if the Svg object is using caching for rendering results

Since:: 4.3

bool isValid ( self )

Check whether this object is backed by a valid SVG file.

This method can be expensive as it causes disk access.

Returns:: true if the SVG file exists and the document is valid, otherwise false.

paint	(	self,
		QPainter	painter,
		QPointF	point,
		QString	elementID=QString()
	)

Paints all or part of the SVG represented by this object

Parameters:

	painter	the QPainter to use
	x	the horizontal coordinate to start painting from
	y	the vertical coordinate to start painting from
	width	the width of the element to draw
	height	the height of the element do draw
	elementId	the ID string of the element to render, or an empty string for the whole SVG (the default)

paint	(	self,
		QPainter	painter,
		int	x,
		int	y,
		QString	elementID=QString()
	)

Paints all or part of the SVG represented by this object

Parameters:

	painter	the QPainter to use
	x	the horizontal coordinate to start painting from
	y	the vertical coordinate to start painting from
	width	the width of the element to draw
	height	the height of the element do draw
	elementId	the ID string of the element to render, or an empty string for the whole SVG (the default)

paint	(	self,
		QPainter	painter,
		QRectF	rect,
		QString	elementID=QString()
	)

Paints all or part of the SVG represented by this object

Parameters:

	painter	the QPainter to use
	x	the horizontal coordinate to start painting from
	y	the vertical coordinate to start painting from
	width	the width of the element to draw
	height	the height of the element do draw
	elementId	the ID string of the element to render, or an empty string for the whole SVG (the default)

paint	(	self,
		QPainter	painter,
		int	x,
		int	y,
		int	width,
		int	height,
		QString	elementID=QString()
	)

Paints all or part of the SVG represented by this object

Parameters:

	painter	the QPainter to use
	x	the horizontal coordinate to start painting from
	y	the vertical coordinate to start painting from
	width	the width of the element to draw
	height	the height of the element do draw
	elementId	the ID string of the element to render, or an empty string for the whole SVG (the default)

QPixmap pixmap	(	self,
		QString	elementID=QString()
	)

Returns a pixmap of the SVG represented by this object.

The size of the pixmap will be the size of this Svg object (size()) if containsMultipleImages is true; otherwise, it will be the size of the requested element after the whole SVG has been scaled to size().

Parameters:

elementId

the ID string of the element to render, or an empty string for the whole SVG (the default)

Returns:: a QPixmap of the rendered SVG

resize	(	self,
		float	width,
		float	height
	)

Resizes the rendered image to the natural size of the SVG.

Rendering will actually take place on the next call to paint.

resize	(	self,
		QSizeF	size
	)

Resizes the rendered image to the natural size of the SVG.

Rendering will actually take place on the next call to paint.

resize ( self )

Resizes the rendered image to the natural size of the SVG.

Rendering will actually take place on the next call to paint.

setContainsMultipleImages	(	self,
		bool	multiple
	)

Set whether the SVG contains a single image or multiple ones.

If this is set to true, the SVG will be treated as a collection of related images, rather than a consistent drawing.

In particular, when individual elements are rendered, this affects whether the elements are resized to size() by default. See paint() and pixmap().

Parameters:

multiple

true if the svg contains multiple images

setImagePath	(	self,
		QString	svgFilePath
	)

Set the SVG file to render.

Relative paths are looked for in the current Plasma theme, and should not include the file extension (.svg and .svgz files will be searched for). See Theme.imagePath().

If the parent object of this Svg is a Plasma.Applet, relative paths will be searched for in the applet's package first.

Parameters:

svgFilePath

either an absolute path to an SVG file, or an image name

setTheme	(	self,
		Plasma.Theme	theme
	)

Sets the Plasma.Theme to use with this Svg object.

By default, Svg objects use Plasma.Theme.default().

This determines how relative image paths are interpreted.

Parameters:

theme

the theme object to use

Since:: 4.3

setUsingRenderingCache	(	self,
		bool	useCache
	)

Sets whether or not to cache the results of rendering to pixmaps.

If the SVG is resized and re-rendered often (and does not keep using the same small set of pixmap dimensions), then it may be less efficient to do disk caching. A good example might be a progress meter that uses an Svg object to paint itself: the meter will be changing often enough, with enough unpredictability and without re-use of the previous pixmaps to not get a gain from caching.

Most Svg objects should use the caching feature, however. Therefore, the default is to use the render cache.

Parameters:

useCache

true to cache rendered pixmaps

Since:: 4.3

QSize size ( self )

The size of the SVG.

If the SVG has been resized with resize(), that size will be returned; otherwise, the natural size of the SVG will be returned.

If containsMultipleImages is true, each element of the SVG will be rendered at this size by default.

Returns:: the current size of the SVG

Plasma.Theme theme ( self )

The Plasma.Theme used by this Svg object.

This determines how relative image paths are interpreted.

Returns:: the theme used by this Svg

Svg Class Reference

Detailed Description

Signals

Methods

Signal Documentation

Method Documentation

Modules