724 lines
25 KiB
C++
724 lines
25 KiB
C++
/*
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* Copyright 2006-2007 by Aaron Seigo <aseigo@kde.org>
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* Copyright 2007 by Riccardo Iaconelli <riccardo@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef PLASMA_APPLET_H
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#define PLASMA_APPLET_H
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#include <QtGui/QGraphicsItem>
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#include <QtGui/QWidget>
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#include <kplugininfo.h>
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#include <ksharedconfig.h>
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#include <kgenericfactory.h>
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#include <plasma/configxml.h>
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#include <plasma/plasma.h>
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#include <plasma/widgets/widget.h>
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namespace Plasma
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{
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class Containment;
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class DataEngine;
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class Package;
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/**
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* @short The base Applet class
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*
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* Applet provides several important roles for add-ons widgets in Plasma.
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*
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* First, it is the base class for the plugin system and therefore is the
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* interface to applets for host applications. It also handles the life time
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* management of data engines (e.g. all data engines accessed via
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* Applet::dataEngine(const QString&) are properly deref'd on Applet
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* destruction), background painting (allowing for consistent and complex
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* look and feel in just one line of code for applets), loading and starting
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* of scripting support for each applet, providing access to the associated
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* plasmoid package (if any) and access to configuration data.
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*
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* See techbase.kde.org for tutorial on writing Applets using this class.
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*/
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class PLASMA_EXPORT Applet : public Widget
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{
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Q_OBJECT
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// Q_PROPERTY( QRectF maxSizeHint READ maxSizeHint )
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Q_PROPERTY( bool hasConfigurationInterface READ hasConfigurationInterface WRITE setHasConfigurationInterface )
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Q_PROPERTY( QString name READ name )
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Q_PROPERTY( QString category READ category )
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Q_PROPERTY( bool immutable READ isImmutable WRITE setImmutable )
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Q_PROPERTY( bool drawStandardBackground READ drawStandardBackground WRITE setDrawStandardBackground )
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Q_PROPERTY( bool failedToLaunch READ failedToLaunch WRITE setFailedToLaunch )
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Q_PROPERTY( bool needsConfiguring READ needsConfiguring WRITE setNeedsConfiguring )
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Q_PROPERTY( QRectF boundingRect READ boundingRect )
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Q_PROPERTY( QRectF geometry READ geometry WRITE setGeometry )
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Q_PROPERTY( bool shouldConserveResources READ shouldConserveResources )
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public:
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typedef QList<Applet*> List;
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typedef QHash<QString, Applet*> Dict;
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/**
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* @arg parent the QGraphicsItem this applet is parented to
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* @arg servideId the name of the .desktop file containing the
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* information about the widget
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* @arg appletId a unique id used to differentiate between multiple
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* instances of the same Applet type
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*/
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explicit Applet(QGraphicsItem* parent = 0,
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const QString& serviceId = QString(),
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uint appletId = 0);
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/**
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* This constructor is to be used with the plugin loading systems
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* found in KPluginInfo and KService. The argument list is expected
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* to have two elements: the KService service ID for the desktop entry
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* and an applet ID which must be a base 10 number.
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*
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* @arg parent a QObject parent; you probably want to pass in 0
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* @arg args a list of strings containing two entries: the service id
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* and the applet id
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*/
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Applet(QObject* parent, const QVariantList& args);
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~Applet();
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/**
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* This method is called once the applet is loaded and added to a Corona.
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* If the applet requires a QGraphicsScene or has an particularly intensive
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* set of initialization routines to go through, consider implementing it
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* in this method instead of the constructor.
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**/
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virtual void init();
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/**
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* @return the id of this applet
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*/
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uint id() const;
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/**
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* Returns the KConfigGroup to access the applets configuration.
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*
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* This config object will write to an instance
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* specific config file named \<appletname\>\<instanceid\>rc
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* in the Plasma appdata directory.
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**/
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KConfigGroup config() const;
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/**
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* Returns a config group with the name provided. This ensures
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* that the group name is properly namespaced to avoid collision
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* with other applets that may be sharing this config file
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*
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* @param group the name of the group to access
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**/
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KConfigGroup config(const QString &group) const;
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/**
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* Saves state information about this applet.
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**/
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void save(KConfigGroup* group) const;
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/**
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* Returns a KConfigGroup object to be shared by all applets of this
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* type.
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*
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* This config object will write to an applet-specific config object
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* named plasma_\<appletname\>rc in the local config directory.
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*/
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KConfigGroup globalConfig() const;
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/**
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* Returns the config skeleton object from this applet's package,
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* if any.
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*
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* @return config skeleton object, or 0 if none
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**/
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ConfigXml* configXml() const;
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/**
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* Loads the given DataEngine
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*
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* Tries to load the data engine given by @p name. Each engine is
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* only loaded once, and that instance is re-used on all subsequent
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* requests.
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*
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* If the data engine was not found, an invalid data engine is returned
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* (see DataEngine::isValid()).
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*
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* Note that you should <em>not</em> delete the returned engine.
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*
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* @param name Name of the data engine to load
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* @return pointer to the data engine if it was loaded,
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* or an invalid data engine if the requested engine
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* could not be loaded
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*/
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Q_INVOKABLE DataEngine* dataEngine(const QString& name) const;
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/**
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* Accessor for the associated Package object if any.
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* Generally, only Plasmoids come in a Package.
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*
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* @return the Package object, or 0 if none
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**/
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const Package* package() const;
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/**
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* Called when any of the geometry constraints have been updated.
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* This method calls constraintsUpdated, which may be reimplemented,
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* once the Applet has been prepared for updating the constraints.
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*
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* @param constraints the type of constraints that were updated
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*/
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void updateConstraints(Plasma::Constraints constraints = Plasma::AllConstraints);
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/**
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* Called when any of the geometry constraints have been updated.
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*
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* This is always called prior to painting and should be used as an
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* opportunity to layout the widget, calculate sizings, etc.
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*
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* Do not call update() from this method; an update() will be triggered
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* at the appropriate time for the applet.
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*
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* @param constraints the type of constraints that were updated
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* @property constraint
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*/
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virtual void constraintsUpdated(Plasma::Constraints constraints);
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/**
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* Returns the current form factor the applet is being displayed in.
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*
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* @see Plasma::FormFactor
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*/
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virtual FormFactor formFactor() const;
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/**
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* Returns the location of the scene which is displaying applet.
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*
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* @see Plasma::Location
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*/
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virtual Location location() const;
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/**
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* Returns the rect that the contents are positioned within in local coordinates
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*/
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QRectF contentRect() const;
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/**
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* Returns the area within which contents can be painted.
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**/
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QSizeF contentSize() const;
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/**
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* Sets the content size.
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*
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* @note Normally an applet should never
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* call this directly except in the constructor to provide a default
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* size
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*
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* @arg size the new size of the contents area
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*/
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void setContentSize(const QSizeF &size);
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/**
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* Sets the content size.
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*
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* @note Normally an applet should never
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* call this directly except in the constructor to provide a default
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* size
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*
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* @arg width the new width of the contents area
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* @arg height the new height of the contents area
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*/
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void setContentSize(int width, int height);
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/**
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* Returns an ideal size for the applet's content.
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* Applets can re-implement this to provide a suitable size based
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* on their contents.
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*
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* Unlike sizeHint() , contentSizeHint() does not include the
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* size of any borders surrounding the content area.
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*
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* The default implementation returns the sizeHint() of the applet's
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* layout if it has one, or a null size otherwise.
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*/
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virtual QSizeF contentSizeHint() const;
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/**
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* Sets the minimum size for the content of this applet
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*/
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void setMinimumContentSize(const QSizeF &minSize);
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/**
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* Sets the minimum size for the content of this applet
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*
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* @arg minWidth the new minimum width of the contents area
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* @arg minHeight the new minimum height of the contents area
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*/
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void setMinimumContentSize(int minWidth, int minHeight);
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/**
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* Get the minimum size for the content of this applet
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*/
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QSizeF minimumContentSize() const;
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/**
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* Sets the maximum size for the content of this applet.
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*/
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void setMaximumContentSize(const QSizeF &maxSize);
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/**
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* Sets the maximum size for the content of this applet
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*
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* @arg maxWidth the new maximum width of the contents area
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* @arg maxHeight the new maximum height of the contents area
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*/
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void setMaximumContentSize(int maxWidth, int maxHeight);
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/**
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* Get the minimum size for the content of this applet
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*/
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QSizeF maximumContentSize() const;
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/**
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* Returns a list of all known applets.
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*
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* @param category Only applets matchin this category will be returned.
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* Useful in conjunction with knownCategories.
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* If "Misc" is passed in, then applets without a
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* Categories= entry are also returned.
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* If an empty string is passed in, all applets are
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* returned.
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* @param parentApp the application to filter applets on. Uses the
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* X-KDE-ParentApp entry (if any) in the plugin info.
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* The default value of QString() will result in a
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* list containing only applets not specifically
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* registered to an application.
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* @return list of applets
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**/
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static KPluginInfo::List knownApplets(const QString &category = QString(),
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const QString &parentApp = QString());
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/**
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* Returns a list of all known applets associated with a certain mimetype.
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*
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* @return list of applets
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**/
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static KPluginInfo::List knownAppletsForMimetype(const QString &mimetype);
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/**
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* Returns a list of all the categories used by
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* installed applets.
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*
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* @param parentApp the application to filter applets on. Uses the
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* X-KDE-ParentApp entry (if any) in the plugin info.
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* The default value of QString() will result in a
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* list containing only applets not specifically
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* registered to an application.
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* @return list of categories
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* @param visibleOnly true if it should only return applets that are marked as visible
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*/
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static QStringList knownCategories(const QString &parentApp = QString(), bool visibleOnly = true);
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/**
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* @return true if this plasmoid provides a GUI configuration
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**/
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bool hasConfigurationInterface();
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/**
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* Attempts to load an applet
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*
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* Returns a pointer to the applet if successful.
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* The caller takes responsibility for the applet, including
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* deleting it when no longer needed.
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*
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* @param name the plugin name, as returned by KPluginInfo::pluginName()
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* @param applet unique ID to assign the applet, or zero to have one
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* assigned automatically.
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* @param args to send the applet extra arguments
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* @return a pointer to the loaded applet, or 0 on load failure
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**/
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static Applet* loadApplet(const QString &name, uint appletId = 0,
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const QVariantList& args = QVariantList());
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/**
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* Attempts to load an applet
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*
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* Returns a pointer to the applet if successful.
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* The caller takes responsibility for the applet, including
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* deleting it when no longer needed.
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*
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* @param info KPluginInfo object for the desired applet
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* @param applet unique ID to assign the applet, or zero to have one
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* assigned automatically.
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* @return a pointer to the loaded applet, or 0 on load failure
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**/
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static Applet* loadApplet(const KPluginInfo& info, uint appletId = 0,
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const QVariantList& args = QVariantList());
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/**
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* This method is called when the interface should be painted.
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*
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* @param painter the QPainter to use to do the paintiner
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* @param option the style options object
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* @param contentsRect the rect to paint within; automatically adjusted for
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* the background, if any
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**/
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virtual void paintInterface(QPainter *painter,
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const QStyleOptionGraphicsItem *option,
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const QRect& contentsRect);
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/**
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* Returns the user-visible name for the applet, as specified in the
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* .desktop file.
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*
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* @return the user-visible name for the applet.
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**/
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QString name() const;
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/**
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* Returns the plugin name for the applet
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*/
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QString pluginName() const;
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/**
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* Whether the applet should conserve resources. If true, try to avoid doing stuff which
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* is computationally heavy. Try to conserve power and resources.
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*
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* @return true if it should conserve resources, false if it does not.
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*/
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bool shouldConserveResources() const;
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/**
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* Returns the icon related to this applet
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**/
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QString icon() const;
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/**
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* Returns the category the applet is in, as specified in the
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* .desktop file.
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*/
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QString category() const;
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/**
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* Returns the color corresponding to the applet's category.
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*/
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QColor color() const;
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/**
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* Get the category of the given applet
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*
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* @param a KPluginInfo object for the applet
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*/
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static QString category(const KPluginInfo& applet);
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/**
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* Get the category of the given applet
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*
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* @param the name of the applet
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*/
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static QString category(const QString& appletName);
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/**
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* @return true if this applet is immutable
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**/
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bool isImmutable() const;
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/**
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* @return true if this applet is immutable due to Kiosk settings
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*/
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bool isKioskImmutable() const;
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/**
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* @return returns whether or not the applet is using the standard
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* background
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**/
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bool drawStandardBackground();
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/**
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* Sets whether the applet should automatically draw the standard
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* background.
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*
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* Defaults to true
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**/
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void setDrawStandardBackground(bool drawBackground);
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/**
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* If for some reason, the applet fails to get up on its feet (the
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* library couldn't be loaded, necessary hardware support wasn't found,
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* etc..) this method returns true
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**/
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bool failedToLaunch() const;
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/**
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* Call this method when the applet fails to launch properly. An
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* optional reason can be provided.
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*
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* Not that all children items will be deleted when this method is
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* called. If you have pointers to these items, you will need to
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* reset them after calling this method.
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*
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* @param failed true when the applet failed, false when it succeeded
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* @param reason an optional reason to show the user why the applet
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* failed to launch
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**/
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void setFailedToLaunch(bool failed, const QString& reason = QString());
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/**
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* @return true if the applet currently needs to be configured,
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* otherwise, false
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*/
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bool needsConfiguring() const;
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/**
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* When the applet needs to be configured before being usable, this
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* method can be called to show a standard interface prompting the user
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* to configure the applet
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*
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* Not that all children items will be deleted when this method is
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* called. If you have pointers to these items, you will need to
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* reset them after calling this method.
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*
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* @param needsConfiguring true if the applet needs to be configured,
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* or false if it doesn't
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*/
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void setNeedsConfiguring(bool needsConfiguring);
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enum { Type = Plasma::AppletType };
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/**
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* Reimplemented from QGraphicsItem
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**/
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int type() const;
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/**
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* Reimplemented from QGraphicsItem
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**/
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QRectF boundingRect () const;
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/**
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* Returns a list of context-related QAction instances.
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*
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* This is used e.g. within the \a DesktopView to display a
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* contextmenu.
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*
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* @return A list of actions. The default implementation returns an
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* empty list.
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**/
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virtual QList<QAction*> contextActions();
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/**
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* Sets shadow for the given applet.
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*/
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void setShadowShown(bool);
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/**
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* Returns true if the given item has a shadow shown.
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*/
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bool isShadowShown() const;
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// reimplemented from LayoutItem
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// value is the same as contentSizeHint() if drawStandardBackground() is false
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// or contentSizeHint() plus the size of the border otherwise.
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virtual QSizeF sizeHint() const;
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/**
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* Sets the geometry of this Plasma::Applet
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* @param geometry the geometry to apply to this Plasma::Applet.
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*/
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void setGeometry(const QRectF &geometry);
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/**
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* Sets whether or not this Applet is acting as a Containment
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*/
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void setIsContainment(bool isContainment);
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/**
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* @return true if this Applet is currently being used as a Containment, false otherwise
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*/
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bool isContainment() const;
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/**
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* @internal
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*/
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void resetConfigurationObject();
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Q_SIGNALS:
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/**
|
|
* Emitted when the applet needs to take (or lose) keyboard focus.
|
|
*
|
|
* An applet should emit this signal to ensure that autohiding
|
|
* elements stay unhidden and other bits of bookkeeping are
|
|
* performed to ensure proper function.
|
|
*
|
|
* If you call watchForFocus on your applet, then this is handled for
|
|
* the applet and it is not necessary to emit the signal directly.
|
|
*
|
|
* @param focus true if the applet is taking keyboard focus, false if
|
|
* it is giving it up
|
|
**/
|
|
void requestFocus( bool focus );
|
|
|
|
/**
|
|
* Emitted whenever the applet makes a geometry change, so that views
|
|
* can coordinate themselves with these changes if they desire.
|
|
*/
|
|
void geometryChanged();
|
|
|
|
/**
|
|
* Emitted when an applet has changed values in its configuration
|
|
* and wishes for them to be saved at the next save point. As this implies
|
|
* disk activity, this signal should be used with care.
|
|
*
|
|
* @note This does not need to be emitted from saveState by individual
|
|
* applets.
|
|
*/
|
|
void configNeedsSaving();
|
|
|
|
public Q_SLOTS:
|
|
/**
|
|
* Sets whether or not this applet is immutable or not.
|
|
*
|
|
* @arg immutable true if this applet should not be changeable
|
|
**/
|
|
void setImmutable(bool immutable);
|
|
|
|
/**
|
|
* Destroys the applet; it will be deleted and configurations reset.
|
|
*/
|
|
void destroy();
|
|
|
|
/**
|
|
* Reimplement this slot to show a configuration dialog.
|
|
*
|
|
* Let the user play with the plasmoid options.
|
|
* Called when the user selects the configure entry
|
|
* from the context menu.
|
|
*/
|
|
virtual void showConfigurationInterface();
|
|
|
|
/**
|
|
* Sends all pending contraints updates to the applet. Will usually
|
|
* be called automatically, but can also be called manually if needed.
|
|
*/
|
|
void flushUpdatedConstraints();
|
|
|
|
/**
|
|
* @return the Containment, if any, this applet belongs to
|
|
**/
|
|
Containment* containment() const;
|
|
|
|
protected:
|
|
/**
|
|
* Called when a request to save the state of the applet is made
|
|
* during runtime
|
|
**/
|
|
virtual void saveState(KConfigGroup* config) const;
|
|
|
|
/**
|
|
* Returns the name of the applet.
|
|
*
|
|
* This will be the same for all instances of this applet.
|
|
**/
|
|
QString globalName() const;
|
|
|
|
/**
|
|
* Returns a name unique to the instance of this applet.
|
|
*
|
|
* Useful for being able to refer directly to a particular
|
|
* applet. Combines the global name with the applet id
|
|
**/
|
|
QString instanceName() const;
|
|
|
|
/**
|
|
* Register widgets that can receive keyboard focus.
|
|
*
|
|
* Calling this results in an eventFilter being places on the widget.
|
|
*
|
|
* @param widget the widget to watch for keyboard focus
|
|
* @param watch whether to start watching the widget, or to stop doing so
|
|
*/
|
|
void watchForFocus( QObject *widget, bool watch = true );
|
|
|
|
/**
|
|
* Call this whenever focus is needed or not needed.
|
|
*
|
|
* You do not have to call this method for widgets that have
|
|
* been registered with watchForFocus
|
|
*
|
|
* @see watchForFocus
|
|
* @param focus whether to or not to request focus
|
|
*/
|
|
void needsFocus(bool focus);
|
|
|
|
/**
|
|
* Sets whether or not this applet provides a user interface for
|
|
* configuring the applet.
|
|
*
|
|
* It defaults to false, and if true is passed in you should
|
|
* also reimplement showConfigurationInterface()
|
|
*
|
|
* @arg hasInterface whether or not there is a user interface available
|
|
**/
|
|
void setHasConfigurationInterface(bool hasInterface);
|
|
|
|
/**
|
|
* @internal event filter; used for focus watching
|
|
**/
|
|
bool eventFilter( QObject *o, QEvent *e );
|
|
|
|
/**
|
|
* Reimplemented from QGraphicsItem
|
|
*/
|
|
QVariant itemChange(GraphicsItemChange change, const QVariant &value);
|
|
|
|
protected Q_SLOTS:
|
|
/**
|
|
* @internal used to show the configuration of an applet on first show
|
|
*/
|
|
void performSetupConfig();
|
|
|
|
/**
|
|
* @internal used to check the immutability of the item in the config file
|
|
*/
|
|
void checkImmutability();
|
|
|
|
private:
|
|
Q_DISABLE_COPY(Applet)
|
|
|
|
/**
|
|
* Reimplemented from QGraphicsItem
|
|
**/
|
|
void paintWidget(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
|
|
|
|
class Private;
|
|
Private* const d;
|
|
};
|
|
|
|
} // Plasma namespace
|
|
|
|
/**
|
|
* Register an applet when it is contained in a loadable module
|
|
*/
|
|
#define K_EXPORT_PLASMA_APPLET(libname, classname) \
|
|
K_PLUGIN_FACTORY(factory, registerPlugin<classname>();) \
|
|
K_EXPORT_PLUGIN(factory("plasma_applet_" #libname))
|
|
|
|
#endif // multiple inclusion guard
|