plasma-framework/runnercontext.h
Jacopo De Simoi 13dd4280f7 Finally constify isValid() [BIC]
svn path=/trunk/KDE/kdelibs/; revision=963116
2009-05-03 23:13:52 +00:00

178 lines
5.4 KiB
C++

/*
* 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 PLASMA_RUNNERCONTEXT_H
#define PLASMA_RUNNERCONTEXT_H
#include <QtCore/QList>
#include <QtCore/QObject>
#include <QtCore/QSharedDataPointer>
#include <plasma/plasma_export.h>
class KCompletion;
namespace Plasma
{
class QueryMatch;
class AbstractRunner;
class RunnerContextPrivate;
/**
* @class RunnerContext plasma/runnercontext.h <Plasma/RunnerContext>
*
* @short The RunnerContext class provides information related to a search,
* including the search term, metadata on the search term and collected
* matches.
*/
class PLASMA_EXPORT RunnerContext : public QObject
{
Q_OBJECT
public:
enum Type {
None = 0,
UnknownType = 1,
Directory = 2,
File = 4,
NetworkLocation = 8,
Executable = 16,
ShellCommand = 32,
Help = 64,
FileSystem = Directory | File | Executable | ShellCommand
};
Q_DECLARE_FLAGS(Types, Type)
explicit RunnerContext(QObject *parent = 0);
/**
* Copy constructor
*/
explicit RunnerContext(RunnerContext &other, QObject *parent = 0);
~RunnerContext();
/**
* Resets the search term for this object.
* This removes all current matches in the process.
*/
void reset();
/**
* Sets the query term for this object and attempts to determine
* the type of the search.
*/
void setQuery(const QString &term);
/**
* @return the current search query term.
*/
QString query() const;
/**
* The type of item the search term might refer to.
* @see Type
*/
Type type() const;
/**
* The mimetype that the search term refers to, if discoverable.
*
* @return QString() if the mimetype can not be determined, otherwise
* the mimetype of the object being referred to by the search
* string.
*/
QString mimeType() const;
/**
* @returns true if this context is no longer valid and therefore
* matching using it should abort. Most useful as an optimization technique
* inside of AbstractRunner subclasses in the match method, e.g.:
*
* while (.. a possibly large iteration) {
* if (!context.isValid()) {
* return;
* }
*
* ... some processing ...
* }
*
* While not required to be used within runners, it provies a nice way
* to avoid unecessary processing in runners that may run for an extended
* period (as measured in 10s of ms) and therefore improve the user experience.
* @since 4.2.3
*/
bool isValid() const;
/**
* Appends lists of matches to the list of matches.
*
* This method is thread safe and causes the matchesChanged() signal to be emitted.
*
* @return true if matches were added, false if matches were e.g. outdated
*/
// trueg: what do we need the term for? It is stored in the context anyway! Plus: matches() does not have a term parameter!
// plus: it is Q_UNUSED
bool addMatches(const QString &term, const QList<QueryMatch> &matches);
/**
* Appends a match to the existing list of matches.
*
* If you are going to be adding multiple matches, use addMatches instead.
*
* @arg term the search term that this match was generated for.
* @arg match the match to add
*
* @return true if the match was added, false otherwise.
*/
// trueg: what do we need the term for? It is stored in the context anyway! Plus: matches() does not have a term parameter!
// plus: it is Q_UNUSED
bool addMatch(const QString &term, const QueryMatch &match);
/**
* Retrieves all available matches for the current search term.
*
* @return a list of matches
*/
QList<QueryMatch> matches() const;
/**
* Retrieves a match by id.
*
* @param id the id of the match to return
* @return the match associated with this id, or an invalid QueryMatch object
* if the id does not eixst
*/
QueryMatch match(const QString &id) const;
Q_SIGNALS:
void matchesChanged();
private:
QExplicitlySharedDataPointer<RunnerContextPrivate> d;
};
}
Q_DECLARE_OPERATORS_FOR_FLAGS(Plasma::RunnerContext::Types)
#endif