350 lines
12 KiB
C++
350 lines
12 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 PLASMA_ABSTRACTRUNNER_H
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#define PLASMA_ABSTRACTRUNNER_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 <kconfiggroup.h>
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#include <kservice.h>
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#include <plasma/plasma_export.h>
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#include <plasma/runnercontext.h>
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#include <plasma/querymatch.h>
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#include <plasma/version.h>
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class QAction;
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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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class QueryMatch;
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class AbstractRunnerPrivate;
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/**
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* @class AbstractRunner plasma/abstractrunner.h <Plasma/AbstractRunner>
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*
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* @short 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 the fact that
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* each runner is executed in its own thread for each new term. Thus, a runner
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* may be executed more than once at the same time. See match() for details.
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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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/** Specifies a nominal speed for the runner */
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enum Speed {
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SlowSpeed,
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NormalSpeed
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};
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/** Specifies a priority for the runner */
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enum Priority {
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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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/** An ordered list of runners */
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typedef QList<AbstractRunner*> List;
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virtual ~AbstractRunner();
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/**
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* This is the main query method. It should trigger creation of
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* QueryMatch instances through RunnerContext::addMatch and
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* RunnerContext::addMatches. It is called internally by performMatch().
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*
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* If the runner can run precisely the requested term (RunnerContext::query()),
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* it should create an exact match by setting the type to RunnerContext::ExactMatch.
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* The first runner that creates a QueryMatch 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 RunnerContext::PossibleMatch.
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*
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* The match will be activated via run() if the user selects it.
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*
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* Each runner is executed in its own thread. Whenever the user input changes this
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* method is called again. Thus, it needs to be thread-safe. Also, all matches need
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* to be reported once this method returns. Asyncroneous runners therefore need
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* to make use of a local event loop to wait for all matches.
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*
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* It is recommended to use local status data in async runners. The simplest way is
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* to have a separate class doing all the work like so:
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*
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* \code
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* void MyFancyAsyncRunner::match( RunnerContext& context )
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* {
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* QEventLoop loop;
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* MyAsyncWorker worker( context );
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* connect( &worker, SIGNAL(finished()),
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* &loop, SLOT(quit()) );
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* worker.work();
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* loop.exec();
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* }
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* \endcode
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*
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* Here MyAsyncWorker creates all the matches and calls RunnerContext::addMatch
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* in some internal slot. It emits the finished() signal once done which will
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* quit the loop and make the match() method return. The local status is kept
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* entirely in MyAsyncWorker which makes match() trivially thread-safe.
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*
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* If a particular match supports multiple actions, set up the corresponding
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* actions in the actionsForMatch method. Do not call any of the action methods
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* within this method!
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* @see actionsForMatch
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*
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* Execution of the correct action should be handled in the run method.
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* @caution This method needs to be thread-safe since KRunner will simply
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* start a new thread for each new term.
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*
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* @caution Returning from this method means to end execution of the runner.
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*
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* @sa run(), RunnerContext::addMatch, RunnerContext::addMatches, QueryMatch
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*/
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virtual void match(Plasma::RunnerContext &context);
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/**
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* Triggers a call to match. This will call match() internally.
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*
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* @arg context the search context used in executing this match.
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*/
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void performMatch(Plasma::RunnerContext &context);
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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 run 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 hasRunOptions();
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/**
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* If hasRunOptions() 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 createRunOptions(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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* @param context The context in which the match is triggered, i.e. for which
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* the match was created.
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* @param match The actual match to run/execute.
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*/
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virtual void run(const Plasma::RunnerContext &context, const Plasma::QueryMatch &match);
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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 OR'ed value of all the Information types (as defined in RunnerContext::Type)
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* this runner is not interested in.
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* @return OR'ed value of black listed types
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*/
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RunnerContext::Types ignoredTypes() const;
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/**
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* Sets the types this runner will ignore
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* @param types OR'ed listed of ignored types
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*/
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void setIgnoredTypes(RunnerContext::Types types);
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/**
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* Returns the user visible engine name for the Runner
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*/
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QString name() const;
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/**
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* Returns an id string for the Runner
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*/
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QString id() const;
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/**
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* Returns the description of this Runner
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*/
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QString description() 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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* Note that the returned pointer is only valid for the lifetime of
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* the runner.
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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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* Signal runner to reload its configuration.
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*/
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virtual void reloadConfiguration();
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protected:
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friend class RunnerManager;
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friend class RunnerManagerPrivate;
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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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/**
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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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* Sets whether or not the runner has options for matches
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*/
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void setHasRunOptions(bool hasRunOptions);
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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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/**
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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 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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/**
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* A given match can have more than action that can be performed on it.
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* For example, a song match returned by a music player runner can be queued,
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* added to the playlist, or played.
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*
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* Call this method to add actions that can be performed by the runner.
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* Actions must first be added to the runner's action registry.
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* Note: execution of correct action is left up to the runner.
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*/
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virtual QList<QAction*> actionsForMatch(const Plasma::QueryMatch &match);
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/**
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* Creates and then adds an action to the action registry.
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* AbstractRunner assumes ownership of the created action.
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*
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* @param id A unique identifier string
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* @param icon The icon to display
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* @param text The text to display
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* @return the created QAction
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*/
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QAction* addAction(const QString &id, const QIcon &icon, const QString &text);
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/**
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* Adds an action to the runner's action registry.
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*
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* The QAction must be created within the GUI thread;
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* do not create it within the match method of AbstractRunner.
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*
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* @param id A unique identifier string
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* @param action The QAction to be stored
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*/
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void addAction(const QString &id, QAction *action);
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/**
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* Removes the action from the action registry.
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* AbstractRunner deletes the action once removed.
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*
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* @param id The id of the action to be removed
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*/
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void removeAction(const QString &id);
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/**
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* Returns the action associated with the id
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*/
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QAction* action(const QString &id) const;
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/**
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* Returns all registered actions
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*/
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QHash<QString, QAction*> actions() const;
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/**
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* Clears the action registry.
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* The action pool deletes the actions.
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*/
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void clearActions();
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protected Q_SLOTS:
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void init();
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private:
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AbstractRunnerPrivate *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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K_EXPORT_PLUGIN_VERSION(PLASMA_VERSION)
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#define K_EXPORT_RUNNER_CONFIG( name, classname ) \
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K_PLUGIN_FACTORY(ConfigFactory, registerPlugin<classname>();) \
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K_EXPORT_PLUGIN(ConfigFactory("kcm_krunner_" #name)) \
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K_EXPORT_PLUGIN_VERSION(PLASMA_VERSION)
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#endif
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