plasma-framework/abstractrunner.h

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