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/QList>
#include <plasma/plasma_export.h>
class KActionCollection;
class QAction;
namespace Plasma
{
/**
* A abstract super-class for Plasma Runners
*/
class PLASMA_EXPORT AbstractRunner : public QObject
{
Q_OBJECT
public:
typedef QList<AbstractRunner*> List;
/**
* Constrcuts an 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 );
virtual ~AbstractRunner();
/**
* If the runner can run precisely this term, return a QAction, else
* return 0. The first runner that returns a QAction will be the
* default runner. Other runner's actions will be suggested in the
* interface. Non-exact matches should be offered via findMatches.
* The action will be activated if the user selects it.
* If the action is informational only and should not be executed,
* disable the action with setEnabled( false ).
*
* If this runner's exact match is selected, the action will not
* be triggered, but it will be passed into the exec method.
* @see exec
*
* Ownership of the action passes to the AbstractRunner class.
*/
QAction* exactMatch(const QString& command);
/**
* @return the last action generated by exactMatch( const QString& )
*/
QAction* exactMatch();
/**
* Requests the runner to find possible matches for the search term.
* Includes basic results paging controls via max and offset.
*
* @param term the search string to use
* @param max maximum number of matches to return
* @param offset the offset into the matched set to start at
*
* @return the collection of actions representing the potential matches
**/
KActionCollection* matches( const QString& term, int max, int offset );
/**
* 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
*/
virtual bool hasOptions( );
/**
* If the hasOptions() returns true, this method will be called to get
* the widget displaying the options the user can interact with.
*/
virtual QWidget* options();
/**
* Static method is called to load and get a list available of Runners.
*/
static List loadRunners( QWidget* parent );
Q_SIGNALS:
/**
* When emitted, the interface will update itself to show the new
* matches. This is meant to be used by asynchronous runners that will
* only be able to start a query on fillMatches being called with
* response (and therefore matches) coming later
*/
void matchesUpdated( KActionCollection* matches );
protected:
/**
* This method is called when there is text input to match. The runner
* should fill the matches action collection with one action per match
* to a maximium of max matches starting at offset in the data set
* If the action is informational only and should not be executed,
* disable the action with setEnabled( false ).
*
* @param matches the action collection to add matches to
* @param term the current search term
* @param max the maximum number of results to return
* @param offset the number of initial results to skip,
* used in conjunction with max
*/
virtual void fillMatches( KActionCollection* matches,
const QString& term,
int max, int offset );
/**
* If the runner can run precisely this term, return a QAction, else
* return 0. The first runner that returns a QAction will be the
* default runner. Other runner's actions will be suggested in the
* interface. Non-exact matches should be offered via findMatches.
* The action will be activated if the user selects it.
*
* @param term the current search term
*/
virtual QAction* accepts(const QString& term) = 0;
/**
* Take action on the command. What this means is dependant on the
* particular runner implementation, e.g. some runners may treat
* command as a shell command, while others may treat it as an
* equation or a user name or ...
*
* This will be called automatically when the exact match is
* selected.
*
* @param action the QAction provided via exactMatch
* @param command the full command string
*/
virtual bool exec(QAction* action, const QString& command) = 0;
private:
class Private;
Private* const d;
private Q_SLOTS:
void runExactMatch();
};
} // Plasma namespace
#define K_EXPORT_PLASMA_RUNNER( libname, classname ) \
K_PLUGIN_FACTORY(factory, registerPlugin<classname>();) \
K_EXPORT_PLUGIN(factory("plasma_runner_" #libname))
#endif