107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
// vim: set tabstop=4 shiftwidth=4 expandtab:
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/*
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Gwenview: an image viewer
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Copyright 2008 Aurélien Gâteau <agateau@kde.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
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*/
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#ifndef ABSTRACTSEMANTICINFOBACKEND_H
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#define ABSTRACTSEMANTICINFOBACKEND_H
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#include <lib/gwenviewlib_export.h>
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// Qt
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#include <QObject>
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#include <QSet>
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// KF
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// Local
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class QUrl;
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namespace Gwenview
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{
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using SemanticInfoTag = QString;
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/**
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* This class represents the set of tags associated to an url.
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*
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* It provides convenience methods to convert to and from QVariant, which are
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* useful to communicate with SemanticInfoDirModel.
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*/
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class GWENVIEWLIB_EXPORT TagSet : public QSet<SemanticInfoTag>
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{
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public:
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TagSet();
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TagSet(const QSet<SemanticInfoTag> &);
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QVariant toVariant() const;
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static TagSet fromVariant(const QVariant &);
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static TagSet fromList(const QList<SemanticInfoTag> &);
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private:
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TagSet(const QList<SemanticInfoTag> &);
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};
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/**
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* A POD struct used by AbstractSemanticInfoBackEnd to store the metadata
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* associated to an url.
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*/
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struct SemanticInfo {
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int mRating;
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QString mDescription;
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TagSet mTags;
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};
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/**
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* An abstract class, used by SemanticInfoDirModel to store and retrieve metadata.
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*/
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class GWENVIEWLIB_EXPORT AbstractSemanticInfoBackEnd : public QObject
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{
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Q_OBJECT
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public:
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explicit AbstractSemanticInfoBackEnd(QObject *parent);
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virtual TagSet allTags() const = 0;
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virtual void refreshAllTags() = 0;
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virtual void storeSemanticInfo(const QUrl &, const SemanticInfo &) = 0;
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virtual void retrieveSemanticInfo(const QUrl &) = 0;
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virtual QString labelForTag(const SemanticInfoTag &) const = 0;
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/**
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* Return a tag for a label. Will emit tagAdded() if the tag had to be
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* created.
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*/
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virtual SemanticInfoTag tagForLabel(const QString &) = 0;
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Q_SIGNALS:
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void semanticInfoRetrieved(const QUrl &, const SemanticInfo &);
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/**
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* Emitted whenever a new tag is added to allTags()
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*/
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void tagAdded(const SemanticInfoTag &, const QString &label);
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};
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} // namespace
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#endif /* ABSTRACTSEMANTICINFOBACKEND_H */
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