/* * Copyright 2010 by Ryan Rix * * 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 PLUGIN_LOADER_H #define PLUGIN_LOADER_H #include #include #include namespace Plasma { class Applet; class DataEngine; class Service; class AbstractRunner; class PluginLoaderPrivate; //TODO: // * add support for ContainmentActions plugins // * add KPluginInfo listing support for Containments (already loaded via the applet loading code) /** * This is an abstract base class which defines an interface to which Plasma's * Applet Loading logic can communicate with a parent application. The plugin loader * must be set before any plugins are loaded, otherwise (for safety reasons), the * default PluginLoader implementation will be used. The reimplemented version should * not do more than simply returning a loaded plugin. It should not init() it, and it should not * hang on to it. The associated methods will be called only when a component of Plasma * needs to load a _new_ plugin. (e.g. DataEngine does it's own caching). * * @author Ryan Rix * @since 4.6 **/ class PLASMA_EXPORT PluginLoader { public: PluginLoader(); virtual ~PluginLoader(); /** * Load an Applet plugin. * * @param name the plugin name, as returned by KPluginInfo::pluginName() * @param appletId unique ID to assign the applet, or zero to have one * assigned automatically. * @param args to send the applet extra arguments * @return a pointer to the loaded applet, or 0 on load failure **/ Applet *loadApplet(const QString &name, uint appletId = 0, const QVariantList &args = QVariantList()); /** * Load a DataEngine plugin. * * @param name the name of the engine * @return the DataEngine that was loaded, or the NullEngine on failure. **/ DataEngine *loadDataEngine(const QString &name); /** * Load a Runner plugin * * @return the Runner that was loaded, or 0 on failure. */ AbstractRunner *loadRunner(const QString &name); /** * Load a Service plugin. * * @param name the plugin name of the service to load * @param args a list of arguments to supply to the service plugin when loading it * @param parent the parent object, if any, for the service * * @return a Service object, unlike Plasma::Service::loadService, this can return null. **/ Service *loadService(const QString &name, const QVariantList &args, QObject *parent = 0); /** * Load a Package plugin. * * @param name the plugin name of the package to load * @param specialization used to find script extensions for the given format, e.g. "QML" for "Plasma/Applet" * * @return a Package object matching name, or an invalid package on failure **/ Package loadPackage(const QString &packageFormat, const QString &specialization = QString()); /** * Returns a list of all known applets. * This may skip applets based on security settings and ExcludeCategories in the application's config. * * @param category Only applets matchin this category will be returned. * Useful in conjunction with knownCategories. * If "Misc" is passed in, then applets without a * Categories= entry are also returned. * If an empty string is passed in, all applets are * returned. * @param parentApp the application to filter applets on. Uses the * X-KDE-ParentApp entry (if any) in the plugin info. * The default value of QString() will result in a * list containing only applets not specifically * registered to an application. * @return list of applets **/ KPluginInfo::List listAppletInfo(const QString &category, const QString &parentApp = QString()); /** * Returns a list of all known DataEngines. * * @param parentApp the application to filter applets on. Uses the * X-KDE-ParentApp entry (if any) in the plugin info. * The default value of QString() will result in a * list containing only applets not specifically * registered to an application. * @return list of DataEngines **/ KPluginInfo::List listDataEngineInfo(const QString &parentApp = QString()); /** * Returns a list of all known Runner implementations * * @param parentApp the application to filter applets on. Uses the * X-KDE-ParentApp entry (if any) in the plugin info. * The default value of QString() will result in a * list containing only applets not specifically * registered to an application. * @return list of AbstractRunners **/ KPluginInfo::List listRunnerInfo(const QString &parentApp = QString()); /** * Set the plugin loader which will be queried for all loads. * * @param loader A subclass of PluginLoader which will be supplied * by the application **/ static void setPluginLoader(PluginLoader* loader); /** * Return the active plugin loader **/ static PluginLoader* pluginLoader(); protected: /** * A re-implementable method that allows subclasses to override * the default behaviour of loadApplet. If the applet requested is not recognized, * then the implementation should return a NULL pointer. This method is called * by loadApplet prior to attempting to load an applet using the standard Plasma * plugin mechanisms. * * @param name the plugin name, as returned by KPluginInfo::pluginName() * @param appletId unique ID to assign the applet, or zero to have one * assigned automatically. * @param args to send the applet extra arguments * @return a pointer to the loaded applet, or 0 on load failure **/ virtual Applet *internalLoadApplet(const QString &name, uint appletId = 0, const QVariantList &args = QVariantList()); /** * A re-implementable method that allows subclasses to override * the default behaviour of loadRunner. If the runner requested is not recognized, * then the implementation should return a NULL pointer. This method is called * by loadRunner prior to attempting to load a DataEgine using the standard Plasma * plugin mechanisms. * * @param name the name of the engine * @return the data engine that was loaded, or the NullEngine on failure. **/ virtual AbstractRunner *internalLoadRunner(const QString &name); /** * A re-implementable method that allows subclasses to override * the default behaviour of loadDataEngine. If the engine requested is not recognized, * then the implementation should return a NULL pointer. This method is called * by loadDataEngine prior to attempting to load a DataEgine using the standard Plasma * plugin mechanisms. * * @param name the name of the engine * @return the data engine that was loaded, or the NullEngine on failure. **/ virtual DataEngine *internalLoadDataEngine(const QString &name); /** * A re-implementable method that allows subclasses to override * the default behaviour of loadService. If the service requested is not recognized, * then the implementation should return a NULL pointer. This method is called * by loadService prior to attempting to load a Service using the standard Plasma * plugin mechanisms. * * @param name the plugin name of the service to load * @param args a list of arguments to supply to the service plugin when loading it * @param parent the parent object, if any, for the service * * @return a Service object, unlike Plasma::Service::loadService, this can return null. **/ virtual Service *internalLoadService(const QString &name, const QVariantList &args, QObject *parent = 0); /** * A re-implementable method that allows subclasses to override * the default behaviour of loadPackage. If the service requested is not recognized, * then the implementation should return a NULL pointer. This method is called * by loadService prior to attempting to load a Service using the standard Plasma * plugin mechanisms. * * @param name the plugin name of the service to load * @param args a list of arguments to supply to the service plugin when loading it * @param parent the parent object, if any, for the service * * @return a Service object, unlike Plasma::Service::loadService, this can return null. **/ virtual Package internalLoadPackage(const QString &name, const QString &specialization); /** * A re-implementable method that allows subclasses to provide additional applets * for listAppletInfo. If the application has no applets to give to the application, * then the implementation should return an empty list. * * This method is called by listAppletInfo prior to generating the list of applets installed * on the system using the standard Plasma plugin mechanisms, and will try to find .desktop * files for your applets. * * @param category Only applets matching this category will be returned. * Useful in conjunction with knownCategories. * If "Misc" is passed in, then applets without a * Categories= entry are also returned. * If an empty string is passed in, all applets are * returned. * @return list of applets **/ virtual KPluginInfo::List internalAppletInfo(const QString &category) const; /** * A re-implementable method that allows subclasses to provide additional DataEngines * for DataEngineManager::listDataEngines. * * @return list of DataEngines, or an empty list if none **/ virtual KPluginInfo::List internalDataEngineInfo() const; /** * Returns a list of all known Runner implementations * * @return list of AbstractRunners, or an empty list if none */ virtual KPluginInfo::List internalRunnerInfo() const; /** * Returns a list of all known Runner implementations * * @return list of AbstractRunners, or an empty list if none */ virtual KPluginInfo::List internalServiceInfo() const; /** * Standardized mechanism for providing internal Applets by install .desktop files * in $APPPDATA/plasma/internal/applets/ * * For applications that do this, internalAppletInfo can be implemented as a one-liner * call to this method. * * @param category Only applets matching this category will be returned. * Useful in conjunction with knownCategories. * If "Misc" is passed in, then applets without a * Categories= entry are also returned. * If an empty string is passed in, all applets are * returned. * @return list of Applets, or an empty list if none */ KPluginInfo::List standardInternalAppletInfo(const QString &category) const; /** * Standardized mechanism for providing internal Applets by install .desktop files * in $APPPDATA/plasma/internal/dataengines/ * * For applications that do this, internalDataEngineInfo can be implemented as a one-liner * call to this method. * * @return list of applets */ KPluginInfo::List standardInternalDataEngineInfo() const; /** * Standardized mechanism for providing internal Applets by install .desktop files * in $APPPDATA/plasma/internal/runners/ * * For applications that do this, internalRunnerInfo can be implemented as a one-liner * call to this method. * * @return list of applets */ KPluginInfo::List standardInternalRunnerInfo() const; /** * Standardized mechanism for providing internal Applets by install .desktop files * in $APPPDATA/plasma/internal/services/ * * For applications that do this, internalRunnerInfo can be implemented as a one-liner * call to this method. * * @return list of applets */ KPluginInfo::List standardInternalServiceInfo() const; private: PluginLoaderPrivate * const d; }; } Q_DECLARE_METATYPE(Plasma::PluginLoader*) #endif