97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
/*
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Gwenview: an image viewer
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Copyright 2007 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, Boston, MA 02110-1301, USA.
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*/
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#ifndef DOCUMENTFACTORY_H
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#define DOCUMENTFACTORY_H
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// Qt
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#include <QObject>
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#include <lib/document/document.h>
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class QUndoGroup;
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class QUrl;
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namespace Gwenview
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{
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struct DocumentFactoryPrivate;
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/**
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* This class holds all instances of Document.
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*
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* It keeps a cache of recently accessed documents to avoid reloading them.
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* To do so it keeps a last-access timestamp, which is updated to the
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* current time every time DocumentFactory::load() is called.
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*/
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class GWENVIEWLIB_EXPORT DocumentFactory : public QObject
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{
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Q_OBJECT
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public:
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static DocumentFactory *instance();
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~DocumentFactory() override;
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/**
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* Loads the document associated with url, or returns an already cached
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* instance of Document::Ptr if there is any.
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* This method updates the last-access timestamp.
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*/
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Document::Ptr load(const QUrl &url);
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/**
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* Returns a document if it has already been loaded once with load().
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* This method does not update the last-access timestamp.
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*/
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Document::Ptr getCachedDocument(const QUrl &) const;
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QList<QUrl> modifiedDocumentList() const;
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bool hasUrl(const QUrl &) const;
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void clearCache();
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QUndoGroup *undoGroup();
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/**
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* Do not keep document whose url is @url in cache even if it has been
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* modified
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*/
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void forget(const QUrl &url);
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Q_SIGNALS:
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void modifiedDocumentListChanged();
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void documentChanged(const QUrl &);
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void documentBusyStateChanged(const QUrl &, bool);
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void readyForDirListerStart(const QUrl &url);
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private Q_SLOTS:
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void slotLoaded(const QUrl &);
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void slotSaved(const QUrl &, const QUrl &);
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void slotModified(const QUrl &);
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void slotBusyChanged(const QUrl &, bool);
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private:
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DocumentFactory();
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DocumentFactoryPrivate *const d;
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};
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} // namespace
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#endif /* DOCUMENTFACTORY_H */
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