503 lines
18 KiB
C++
503 lines
18 KiB
C++
/*
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* Copyright (C) 2006-2007 by Aaron Seigo <aseigo@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 version 2 as
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* published by the Free Software Foundation
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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/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 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::datEngine(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 QObject, 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 lockApplet READ lockApplet WRITE setLockApplet )
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Q_PROPERTY( QRectF boundingRect READ boundingRect )
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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 QStringList& args);
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~Applet();
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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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* 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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* 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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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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*
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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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* @property constraint
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*/
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virtual void constraintsUpdated();
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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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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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Location location() const;
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/**
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* Returns a maximum size hint based on the Corona's space availability.
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*
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* An applet may choose to violate this size hint, but should try and
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* respect it as much as possible.
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*/
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// QRectF maxSizeHint() const;
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/**
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* Returns the area within which contents can be painted. If there is no
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* background, then this is equivalent to boundingRect().
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*
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* Applets should implement contentSize() to tell Plasma::Applet how
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* much space they need.
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*
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* When drawing to the applet in the paintInterface() method, you can
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* use the QRect passed to that function. Outside paintInterface(), for
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* example when positioning a Plasma::Widget, you can assume your drawing
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* area has (0,0) at the top left and is the size of contentSize().
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*
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* If drawStandardBackground() == true, enough space will reserved
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* within the borders for the content, and boundingRect() will the
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* total size of the applet, including borders.
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*
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* If the applet has not asked Plasma::Applet to draw the default
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* background, boundingRect().size() == contentSize(), and
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* boundingRect().topLeft() == QPointF(0,0). Also, such applets will
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* not break if they implement boundingRect() instead.
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*
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* Note that if the value returned by contentSize() (and hence
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* boundingRect()) changes for any reason, you should call
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* prepareGeometryChange() to notify the Corona.
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**/
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virtual QSizeF contentSize() const;
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/**
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* Returns a list of all known applets in a hash keyed by a unique
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* identifier for each applet.
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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 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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*/
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static QStringList knownCategories(const QString &parentApp = QString());
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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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* Reimplement this slot to show a configuration dialog.
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*
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* Let the user play with the plasmoid options.
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* Called when the user selects the configure entry
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* from the context menu.
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*/
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virtual void showConfigurationInterface();
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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 QStringList& args = QStringList());
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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 QStringList& args = QStringList());
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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 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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* Sets whether or not this applet is immutable or not.
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*
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* @arg immutable true if this applet should not be changeable
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**/
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void setImmutable(bool immutable);
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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 false
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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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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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bool lockApplet() const;
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void setLockApplet(bool lock);
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bool canBeMoved() const;
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void setCanBeMoved( bool move);
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Q_SIGNALS:
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/**
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* Emitted when the applet needs to take (or lose) keyboard focus.
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*
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* An applet should emit this signal to ensure that autohiding
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* elements stay unhidden and other bits of bookkeeping are
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* performed to ensure proper function.
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*
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* If you call watchForFocus on your applet, then this is handled for
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* the applet and it is not necessary to emit the signal directly.
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*
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* @param focus true if the applet is taking keyboard focus, false if
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* it is giving it up
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**/
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void requestFocus( bool focus );
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protected Q_SLOTS:
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void slotLockApplet(bool);
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protected:
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/**
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* Returns the name of the applet.
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*
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* This will be the same for all instances of this applet.
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**/
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QString globalName() const;
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/**
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* Returns a name unique to the instance of this applet.
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*
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* Useful for being able to refer directly to a particular
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* applet. Combines the global name with the applet id
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**/
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QString instanceName() const;
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/**
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* Register widgets that can receive keyboard focus.
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*
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* Calling this results in an eventFilter being places on the widget.
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*
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* @param widget the widget to watch for keyboard focus
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* @param watch whether to start watching the widget, or to stop doing so
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*/
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void watchForFocus( QObject *widget, bool watch = true );
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/**
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* Call this whenever focus is needed or not needed.
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*
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* You do not have to call this method for widgets that have
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* been registered with watchForFocus
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*
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* @see watchForFocus
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* @param focus whether to or not to request focus
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*/
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void needsFocus(bool focus);
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/**
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* Sets whether or not this applet provides a user interface for
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* configuring the applet.
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*
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* It defaults to false, and if true is passed in you should
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* also reimplement showConfigurationInterface()
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*
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* @arg hasInterface whether or not there is a user interface available
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**/
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void setHasConfigurationInterface(bool hasInterface);
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/**
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* @internal event filter; used for focus watching
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**/
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bool eventFilter( QObject *o, QEvent *e );
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private:
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Q_DISABLE_COPY(Applet)
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/**
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* Reimplemented from QGraphicsItem
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**/
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void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
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class Private;
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Private* const d;
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};
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} // Plasma namespace
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/**
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* Register an applet when it is contained in a loadable module
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*/
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#define K_EXPORT_PLASMA_APPLET(libname, classname) \
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K_EXPORT_COMPONENT_FACTORY( \
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plasma_applet_##libname, \
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KGenericFactory<classname>("plasma_applet_" #libname))
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#endif // multiple inclusion guard
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