244 lines
8.0 KiB
C++
244 lines
8.0 KiB
C++
/*
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* Copyright 2006-2007 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 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 RUNNER_H
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#define RUNNER_H
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#include <QtCore/QObject>
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#include <QtCore/QMutex>
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#include <QtCore/QStringList>
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#include <KDE/KConfigGroup>
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#include <KDE/KService>
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#include <plasma/plasma_export.h>
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#include <plasma/package.h>
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#include <plasma/searchmatch.h>
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#include <plasma/searchcontext.h>
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class KCompletion;
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namespace Plasma
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{
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class Package;
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class RunnerScript;
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/**
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* An abstract base class for Plasma Runner plugins
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*
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* Be aware that runners have to be thread-safe. This is due to
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* the fact that each runner is executed in its own thread for
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* each new term. Thus, a runner may be executed more than once
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* at the same time.
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*/
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class PLASMA_EXPORT AbstractRunner : public QObject
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{
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Q_OBJECT
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public:
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enum Speed { NormalSpeed,
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SlowSpeed
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};
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enum Priority { LowestPriority = 0,
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LowPriority,
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NormalPriority,
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HighPriority,
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HighestPriority
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};
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typedef QList<AbstractRunner*> List;
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/**
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* Static method is called to load and get a list available of Runners.
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*
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* @param whitelist An optional whitelist of runners to load
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*/
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static List load(QObject* parent, const QStringList& whitelist = QStringList());
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/**
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* Constructs a Runner object. Since AbstractRunner has pure virtuals,
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* this constructor can not be called directly. Rather a subclass must
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* be created
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*/
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explicit AbstractRunner(QObject* parent = 0, const QString& serviceId = QString());
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AbstractRunner(QObject* parent, const QVariantList& args);
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virtual ~AbstractRunner();
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/**
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* Provides access to the runner's configuration object.
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*/
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KConfigGroup config() const;
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/**
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* This is the main query method. It should trigger creation of
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* SearchMatch instances through SearchContext::addInformationalMatch,
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* SearchContext::addExactMatch, and SearchContext::addPossibleMatch.
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*
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* If the runner can run precisely the requested term (SearchContext::searchTerm),
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* it should create an exact match (SearchContext::addExactMatch).
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* The first runner that creates a SearchMatch will be the
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* default runner. Other runner's matches will be suggested in the
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* interface. Non-exact matches should be offered via SearchContext::addPossibleMatch.
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*
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* The match will be activated if the user selects it.
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*
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* If this runner's exact match is selected, it will be passed into
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* the exec method.
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* @see exec
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*
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* Since each runner is executed in its own thread there is no need
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* to return from this method right away, nor to create all matches
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* here.
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*/
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virtual void match(Plasma::SearchContext *search);
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/**
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* Triggers a call to match.
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*
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* @arg globalContext the search context used in executing this match.
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*/
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void performMatch(Plasma::SearchContext &globalContext);
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/**
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* If the runner has options that the user can interact with to modify
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* what happens when exec or one of the actions created in fillMatches
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* is called, the runner should return true
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*/
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bool hasMatchOptions();
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/**
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* If hasMatchOptions() returns true, this method may be called to get
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* a widget displaying the options the user can interact with to modify
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* the behaviour of what happens when a given match is selected.
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*
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* @param widget the parent of the options widgets.
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*/
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virtual void createMatchOptions(QWidget *widget);
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/**
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* If the runner itself has configuration options, this method returns true
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*/
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bool isConfigurable();
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/**
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* If isConfigurable() returns true, this method may to get
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* a widget displaying the options the user can interact with to modify
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* the behaviour of what happens when a given match is selected.
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*
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* @param widget the parent of the options widgets.
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*/
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virtual void createConfigurationInterface(QWidget *widget);
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/**
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* Called whenever an exact or possible match associated with this
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* runner is triggered.
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*/
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virtual void exec(const Plasma::SearchContext *context, const Plasma::SearchMatch *action);
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/**
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* The nominal speed of the runner.
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* @see setSpeed
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*/
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Speed speed() const;
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/**
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* The priority of the runner.
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* @see setPriority
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*/
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Priority priority() const;
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/**
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* Returns the engine name for the Runner
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*/
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QString runnerName() const;
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/**
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* Accessor for the associated Package object if any.
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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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protected:
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/**
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* Sets whether or not the the runner has options for matches
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*/
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void setHasMatchOptions(bool hasMatchOptions);
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/**
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* Sets whether or not the runner has configuration options itself
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*/
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void setIsConfigurable(bool canBeConfigured);
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/**
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* Sets the nominal speed of the runner. Only slow runners need
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* to call this within their constructor because the default
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* speed is NormalSpeed. Runners that use DBUS should call
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* this within their constructors.
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*/
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void setSpeed(Speed newSpeed);
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//For 4.1
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// /**
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// * Sets the run tier of the runner. Higher tier runners execute only
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// * after all lower-level runners execute. Call this method if your runner
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// * depends on the output of previous runners.
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// */
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// void setTier(int tier);
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/**
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* Sets the priority of the runner. Lower priority runners are executed
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* only after higher priority runners.
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*/
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void setPriority(Priority newPriority);
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/**
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* A blocking method to do queries of installed Services which can provide
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* a measure of safety for runners running their own threads. This should
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* be used instead of calling KServiceTypeTrader::query(..) directly.
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*
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* @arg serviceType a service type like "Plasma/Applet" or "KFilePlugin"
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* @arg constraint a constraint to limit the the choices returned.
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* @see KServiceTypeTrader::query(const QString&, const QString&)
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*
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* @return a list of services that satisfy the query.
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*/
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KService::List serviceQuery(const QString &serviceType,
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const QString &constraint = QString()) const;
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QMutex* bigLock() const;
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protected Q_SLOTS:
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void init();
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private:
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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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#define K_EXPORT_PLASMA_RUNNER( libname, classname ) \
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K_PLUGIN_FACTORY(factory, registerPlugin<classname>();) \
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K_EXPORT_PLUGIN(factory("plasma_runner_" #libname))
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#endif
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