/* * Copyright 2008 Aaron Seigo * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Library General Public License as * published by the Free Software Foundation; either version 2, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details * * You should have received a copy of the GNU Library General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef PLASMA_SERVICE_H #define PLASMA_SERVICE_H #include #include #include #include #include #include class QGraphicsWidget; class QIODevice; class QWidget; class QUrl; namespace Plasma { class ServiceJob; class ServicePrivate; /** * @class Service plasma/service.h * * @short This class provides a generic API for write access to settings or services. * * Plasma::Service allows interaction with a "destination", the definition of which * depends on the Service itself. For a network settings Service this might be a * profile name ("Home", "Office", "Road Warrior") while a web based Service this * might be a username ("aseigo", "stranger65"). * * A Service provides one or more operations, each of which provides some sort * of interaction with the destination. Operations are described using config * XML which is used to create a KConfig object with one group per operation. * The group names are used as the operation names, and the defined items in * the group are the parameters available to be set when using that operation. * * A service is started with a KConfigGroup (representing a ready to be serviced * operation) and automatically deletes itself after completion and signaling * success or failure. See KJob for more information on this part of the process. * * Services may either be loaded "stand alone" from plugins, or from a DataEngine * by passing in a source name to be used as the destination. * * Sample use might look like: * * @code * Plasma::DataEngine *twitter = dataEngine("twitter"); * Plasma::Service *service = twitter.serviceForSource("aseigo"); * KConfigGroup op = service->operationDescription("update"); * op.writeEntry("tweet", "Hacking on plasma!"); * Plasma::ServiceJob *job = service->startOperationCall(op); * connect(job, SIGNAL(finished(KJob*)), this, SLOT(jobCompeted())); * @endcode * * Please remember, the service needs to be deleted when it will no longer be * used. This can be done manually or by these (perhaps easier) alternatives: * * If it is needed throughout the lifetime of the object: * @code * service->setParent(this); * @endcode * * If the service will not be used after just one operation call, use: * @code * connect(job, SIGNAL(finished(KJob*)), service, SLOT(deleteLater())); * @endcode * */ class PLASMA_EXPORT Service : public QObject { Q_OBJECT Q_DECLARE_PRIVATE(Service) Q_PROPERTY(QString destination READ destination WRITE setDestination) Q_PROPERTY(QStringList operationNames READ operationNames) Q_PROPERTY(QString name READ name) public: /** * Destructor */ ~Service(); /** * Used to access a service from an url. Always check for the signal serviceReady() that fires * when this service is actually ready for use. */ static Service *access(const QUrl &url, QObject *parent = 0); /** * Sets the destination for this Service to operate on * * @param destination specific to each Service, this sets which * target or address for ServiceJobs to operate on */ Q_INVOKABLE void setDestination(const QString &destination); /** * @return the target destination, if any, that this service is associated with */ Q_INVOKABLE QString destination() const; /** * @return the possible operations for this profile */ Q_INVOKABLE QStringList operationNames() const; /** * Retrieves the parameters for a given operation * * @param operationName the operation to retrieve parameters for * @return KConfigGroup containing the parameters */ Q_INVOKABLE KConfigGroup operationDescription(const QString &operationName); /** * Called to create a ServiceJob which is associated with a given * operation and parameter set. * * @return a started ServiceJob; the consumer may connect to relevant * signals before returning to the event loop */ Q_INVOKABLE ServiceJob *startOperationCall(const KConfigGroup &description, QObject *parent = 0); /** * Query to find if an operation is enabled or not. * * @param operation the name of the operation to check * @return true if the operation is enabled, false otherwise */ Q_INVOKABLE bool isOperationEnabled(const QString &operation) const; /** * The name of this service */ Q_INVOKABLE QString name() const; /** * Assoicates a widget with an operation, which allows the service to * automatically manage, for example, the enabled state of a widget. * * This will remove any previous associations the widget had with * operations on this engine. * * @param widget the QWidget to associate with the service * @param operation the operation to associate the widget with */ Q_INVOKABLE void associateWidget(QWidget *widget, const QString &operation); /** * Disassociates a widget if it has been associated with an operation * on this service. * * This will not change the enabled state of the widget. * * @param widget the QWidget to disassociate. */ Q_INVOKABLE void disassociateWidget(QWidget *widget); /** * Assoicates a widget with an operation, which allows the service to * automatically manage, for example, the enabled state of a widget. * * This will remove any previous associations the widget had with * operations on this engine. * * @param widget the QGraphicsItem to associate with the service * @param operation the operation to associate the widget with */ Q_INVOKABLE void associateWidget(QGraphicsWidget *widget, const QString &operation); /** * Disassociates a widget if it has been associated with an operation * on this service. * * This will not change the enabled state of the widget. * * @param widget the QGraphicsWidget to disassociate. */ Q_INVOKABLE void disassociateWidget(QGraphicsWidget *widget); /** * @return a parameter map for the given description * @param description the configuration values to turn into the parameter map * @since 4.4 */ Q_INVOKABLE QHash parametersFromDescription(const KConfigGroup &description); Q_SIGNALS: /** * Emitted when the Service's operations change. For example, a * media player service may change what operations are available * in response to the state of the player. */ void operationsChanged(); /** * Emitted when this service is ready for use */ void serviceReady(Plasma::Service *service); protected: /** * Default constructor * * @param parent the parent object for this service */ explicit Service(QObject *parent = 0); /** * Constructor for plugin loading */ Service(QObject *parent, const QVariantList &args); /** * Called when a job should be created by the Service. * * @param operation which operation to work on * @param parameters the parameters set by the user for the operation * @return a ServiceJob that can be started and monitored by the consumer */ virtual ServiceJob *createJob(const QString &operation, QHash ¶meters) = 0; /** * By default this is based on the file in plasma/services/name.operations, but can be * reimplented to use a different mechanism. * * It should result in a call to setOperationsScheme(QIODevice *); */ virtual void registerOperationsScheme(); /** * Sets the XML used to define the operation schema for * this Service. */ void setOperationsScheme(QIODevice *xml); /** * Sets the name of the Service; useful for Services not loaded from plugins, * which use the plugin name for this. * * @param name the name to use for this service */ void setName(const QString &name); /** * Enables a given service by name * * @param operation the name of the operation to enable or disable * @param enable true if the operation should be enabld, false if disabled */ void setOperationEnabled(const QString &operation, bool enable); private: Q_PRIVATE_SLOT(d, void associatedWidgetDestroyed(QObject *)) Q_PRIVATE_SLOT(d, void associatedGraphicsWidgetDestroyed(QObject *)) ServicePrivate * const d; friend class Applet; friend class DataEnginePrivate; friend class GetSource; friend class PackagePrivate; friend class ServiceProvider; friend class RemoveService; friend class PluginLoader; }; } // namespace Plasma Q_DECLARE_METATYPE(Plasma::Service *) /** * Register a service when it is contained in a loadable module */ #define K_EXPORT_PLASMA_SERVICE(libname, classname) \ K_PLUGIN_FACTORY(factory, registerPlugin();) \ K_EXPORT_PLUGIN(factory("plasma_service_" #libname)) \ K_EXPORT_PLUGIN_VERSION(PLASMA_VERSION) #endif // multiple inclusion guard