Wallpaper Class Reference

from PyKDE4.plasma import *

Inherits: QObject
Namespace: Plasma

Detailed Description

Abstract class:: This class can be used as a base class for new classes, but can not be instantiated directly.

Wallpaper plasma/wallpaper.h <Plasma/Wallpaper>

The base Wallpaper class

"Wallpapers" are components that paint the background for Containments that do not provide their own background rendering.

Wallpaper plugins are registered using .desktop files. These files should be named using the following naming scheme:

plasma-wallpaper-<pluginname>.desktop

If a wallpaper plugin provides more than on mode (e.g. Single Image, Wallpaper) it should include a Actions= entry in the .desktop file, listing the possible actions. An actions group should be included to provide for translatable names.

Enumerations
ResizeMethod	{ ScaledResize, CenteredResize, ScaledAndCroppedResize, TiledResize, CenterTiledResize, MaxpectResize }
Signals
	configNeedsSaving ()
	configurationRequired (bool needsConfig)
	configureRequested ()
	renderCompleted (QImage image)
	renderHintsChanged ()
	update (QRectF exposedArea)
Methods
	__init__ (self, QObject parent=0)
	__init__ (self, QObject parent, QVariantList args)
QRectF	boundingRect (self)
	configNeedsSaving (self)
bool	configurationRequired (self)
	configurationRequired (self, bool needsConfig)
	configureRequested (self)
QWidget	createConfigurationInterface (self, QWidget parent)
Plasma.DataEngine	dataEngine (self, QString name)
bool	findInCache (self, QString key, QImage image, long lastModified=0)
QString	icon (self)
	init (self, KConfigGroup config)
	insertIntoCache (self, QString key, QImage image)
bool	isInitialized (self)
bool	isUsingRenderingCache (self)
[KServiceAction]	listRenderingModes (self)
	mouseMoveEvent (self, QGraphicsSceneMouseEvent event)
	mousePressEvent (self, QGraphicsSceneMouseEvent event)
	mouseReleaseEvent (self, QGraphicsSceneMouseEvent event)
QString	name (self)
	paint (self, QPainter painter, QRectF exposedRect)
QString	pluginName (self)
	render (self, QString sourceImagePath, QSize size, Plasma.Wallpaper.ResizeMethod resizeMethod=Plasma.Wallpaper.ScaledResize, QColor color=QColor(0,0,0))
	renderCompleted (self, QImage image)
	renderHintsChanged (self)
KServiceAction	renderingMode (self)
	restore (self, KConfigGroup config)
	save (self, KConfigGroup config)
	setBoundingRect (self, QRectF boundingRect)
	setConfigurationRequired (self, bool needsConfiguring, QString reason=QString())
	setRenderingMode (self, QString mode)
	setResizeMethodHint (self, Plasma.Wallpaper.ResizeMethod resizeMethod)
	setTargetSizeHint (self, QSizeF targetSize)
	setUsingRenderingCache (self, bool useCache)
	update (self, QRectF exposedArea)
	wheelEvent (self, QGraphicsSceneWheelEvent event)
Static Methods
KPluginInfo.List	listWallpaperInfo (QString formFactor=QString())
Plasma.Wallpaper	load (QString name, QVariantList args=QVariantList())
Plasma.Wallpaper	load (KPluginInfo info, QVariantList args=QVariantList())
Plasma.PackageStructure.Ptr	packageStructure (Plasma.Wallpaper paper=0)

Method Documentation

__init__	(	self,
		QObject	parent=0
	)

Default constructor for an empty or null wallpaper

__init__	(	self,
		QObject	parent,
		QVariantList	args
	)

This constructor is to be used with the plugin loading systems found in KPluginInfo and KService. The argument list is expected to have one element: the KService service ID for the desktop entry.

Parameters:

	parent	a QObject parent; you probably want to pass in 0
	args	a list of strings containing one entry: the service id

QRectF boundingRect ( self )

Returns bounding rectangle

configNeedsSaving ( self )

Emitted when the configuration of the wallpaper needs to be saved to disk.

Since:: 4.3

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

bool configurationRequired ( self )

Returns:: true if the wallpaper currently needs to be configured, otherwise, false

Since:: 4.3

configurationRequired	(	self,
		bool	needsConfig
	)

Emitted when the state of the wallpaper requiring configuration changes.

Since:: 4.3

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

configureRequested ( self )

Emitted when the user wants to configure/change the wallpaper.

Since:: 4.3

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

QWidget createConfigurationInterface	(	self,
		QWidget	parent
	)

Returns a widget that can be used to configure the options (if any) associated with this wallpaper. It will be deleted by the caller when it complete. The default implementation returns a null pointer.

To signal that settings have changed connect to settingsChanged(bool modified) in parent.

 connect(this, SIGNAL(settingsChanged(bool), parent, SLOT(settingsChanged(bool)))

Emit settingsChanged(true) when the settings are changed and false when the original state is restored.

Implementation detail note: for best visual results, use a QGridLayout with two columns, with the option labels in column 0

Plasma.DataEngine dataEngine	(	self,
		QString	name
	)

Loads the given DataEngine

Tries to load the data engine given by name. Each engine is only loaded once, and that instance is re-used on all subsequent requests.

If the data engine was not found, an invalid data engine is returned (see DataEngine.isValid()).

Note that you should <em>not</em> delete the returned engine.

Parameters:

name

Name of the data engine to load

Returns:: pointer to the data engine if it was loaded, or an invalid data engine if the requested engine could not be loaded

Since:: 4.3

bool findInCache	(	self,
		QString	key,
		QImage	image,
		long	lastModified=0
	)

Tries to load pixmap with the specified key from cache.

Parameters:

	key	the name to use in the cache for this image
	image	the image object to populate with the resulting data if found
	lastModified	if non-zero, the time stamp is also checked on the file, and must be newer than the timestamp to be loaded

Returns:: true when pixmap was found and loaded from cache, false otherwise

Since:: 4.3

QString icon ( self )

Returns the icon related to this wallpaper

init	(	self,
		KConfigGroup	config
	)

This method is called once the wallpaper is loaded or mode is changed.

The mode can be retrieved using the renderingMode() method.

Parameters:

config

Config group to load settings

insertIntoCache	(	self,
		QString	key,
		QImage	image
	)

Insert specified pixmap into the cache if usingRenderingCache. If the cache already contains pixmap with the specified key then it is overwritten.

Parameters:

	key	the name use in the cache for this image; if the image is specific to this wallpaper plugin, consider including the name() as part of the cache key to avoid collisions with other plugins.
	image	the image to store in the cache; passing in a null image will cause the cached image to be removed from the cache

Since:: 4.3

bool isInitialized ( self )

Returns:: true if initialized (usually by calling restore), false otherwise

bool isUsingRenderingCache ( self )

Returns:: true if disk caching is turned on.

Since:: 4.3

[KServiceAction] listRenderingModes ( self )

Returns modes the wallpaper has, as specified in the .desktop file.

KPluginInfo.List listWallpaperInfo	(	QString	formFactor=QString()
	)

Returns a list of all known wallpapers.

Returns:: list of wallpapers

Plasma.Wallpaper load	(	QString	name,
		QVariantList	args=QVariantList()
	)

Attempts to load a wallpaper

Returns a pointer to the wallpaper if successful. The caller takes responsibility for the wallpaper, including deleting it when no longer needed.

Parameters:

	name	the plugin name, as returned by KPluginInfo.pluginName()
	args	to send the wallpaper extra arguments

Returns:: a pointer to the loaded wallpaper, or 0 on load failure

Plasma.Wallpaper load	(	KPluginInfo	info,
		QVariantList	args=QVariantList()
	)

Attempts to load a wallpaper

Returns a pointer to the wallpaper if successful. The caller takes responsibility for the wallpaper, including deleting it when no longer needed.

Parameters:

	info	KPluginInfo object for the desired wallpaper
	args	to send the wallpaper extra arguments

Returns:: a pointer to the loaded wallpaper, or 0 on load failure

mouseMoveEvent	(	self,
		QGraphicsSceneMouseEvent	event
	)

Mouse move event. To prevent further propagation of the event, the event must be accepted.

Parameters:

event

the mouse event object

mousePressEvent	(	self,
		QGraphicsSceneMouseEvent	event
	)

Mouse press event. To prevent further propagation of the even, and to receive mouseMoveEvents, the event must be accepted.

Parameters:

event

the mouse event object

mouseReleaseEvent	(	self,
		QGraphicsSceneMouseEvent	event
	)

Mouse release event. To prevent further propagation of the event, the event must be accepted.

Parameters:

event

the mouse event object

QString name ( self )

Returns the user-visible name for the wallpaper, as specified in the .desktop file.

Returns:: the user-visible name for the wallpaper.

Plasma.PackageStructure.Ptr packageStructure	(	Plasma.Wallpaper	paper=0
	)

Returns the Package specialization for wallpapers. May be queried for 'preferred' which will return the preferred wallpaper image path given the associated Wallpaper object, if any.

Parameters:

paper

the Wallpaper object to associated the PackageStructure with, which will then use the Wallpaper object to define things such as default size and resize methods.

paint	(	self,
		QPainter	painter,
		QRectF	exposedRect
	)

Abstract method:: This method is abstract and can be overridden but not called directly.

This method is called when the wallpaper should be painted.

Parameters:

	painter	the QPainter to use to do the painting
	exposedRect	the rect to paint within

QString pluginName ( self )

Returns the plugin name for the wallpaper

render	(	self,
		QString	sourceImagePath,
		QSize	size,
		Plasma.Wallpaper.ResizeMethod	resizeMethod=Plasma.Wallpaper.ScaledResize,
		QColor	color=QColor(0,0,0)
	)

Renders the wallpaper asyncronously with the given parameters. When the rendering is complete, the renderCompleted signal is emitted.

Parameters:

sourceImagePath the path to the image file on disk. Common image formats such as PNG, JPEG and SVG are supported

size the size to render the image as

resizeMethod

the method to use when resizing the image to fit size,

See also:: ResizeMethod

Parameters:

color

the color to use to pad the rendered image if it doesn't take up the entire size with the given ResizeMethod

Since:: 4.3

renderCompleted	(	self,
		QImage	image
	)

Emitted when a wallpaper image render is completed.

Since:: 4.3

Signal syntax:: QObject.connect(source, SIGNAL("renderCompleted(const QImage&)"), target_slot)

renderHintsChanged ( self )

Internal:

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

KServiceAction renderingMode ( self )

Returns:: the currently active rendering mode

restore	(	self,
		KConfigGroup	config
	)

This method should be called once the wallpaper is loaded or mode is changed.

Parameters:

config

Config group to load settings

See also:: init

save	(	self,
		KConfigGroup	config
	)

This method is called when settings need to be saved.

Parameters:

config

Config group to save settings

setBoundingRect	(	self,
		QRectF	boundingRect
	)

Sets bounding rectangle

setConfigurationRequired	(	self,
		bool	needsConfiguring,
		QString	reason=QString()
	)

When the wallpaper needs to be configured before being usable, this method can be called to denote that action is required

Parameters:

	needsConfiguring	true if the applet needs to be configured, or false if it doesn't
	reason	a translated message for the user explaining that the applet needs configuring; this should note what needs to be configured

Since:: 4.3

setRenderingMode	(	self,
		QString	mode
	)

Sets the rendering mode for this wallpaper.

Parameters:

mode

One of the modes supported by the plugin, or an empty string for the default mode.

setResizeMethodHint	(	self,
		Plasma.Wallpaper.ResizeMethod	resizeMethod
	)

Allows one to set rendering hints that may differ from the actualities of the Wallpaper's current state, allowing for better selection of papers from packages, for instance.

@arg resizeMethod The resize method to assume will be used for future wallpaper scaling; may later be changed by calls to render()

Since:: 4.3

setTargetSizeHint	(	self,
		QSizeF	targetSize
	)

setUsingRenderingCache	(	self,
		bool	useCache
	)

Sets whether or not to cache on disk the results of calls to render. If the wallpaper changes often or is innexpensive to render, then it's probably best not to cache them.

The default is not to cache.

See also:: render

Parameters:

useCache

true to cache rendered papers on disk, false not to cache

Since:: 4.3

update	(	self,
		QRectF	exposedArea
	)

This signal indicates that wallpaper needs to be repainted.

Signal syntax:: QObject.connect(source, SIGNAL("update(const QRectF&)"), target_slot)

wheelEvent	(	self,
		QGraphicsSceneWheelEvent	event
	)

Mouse wheel event. To prevent further propagation of the event, the event must be accepted.

Parameters:

event

the wheel event object

Enumeration Documentation

ResizeMethod

Various resize modes supported by the built in image renderer

Enumerator:

ScaledResize
CenteredResize
ScaledAndCroppedResize
TiledResize
CenterTiledResize
MaxpectResize

Full Index

Wallpaper Class Reference

Detailed Description

Enumerations

Signals

Methods

Static Methods

Method Documentation

Enumeration Documentation

Modules