60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
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/* This file is part of Clementine.
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Copyright 2010, David Sansome <me@davidsansome.com>
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Clementine is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Clementine 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 Clementine. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef COVERPROVIDERS_H
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#define COVERPROVIDERS_H
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#include <QMutex>
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#include <QObject>
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class CoverProvider;
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// This is a singleton, a global repository for cover providers. Each one of those has to register
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// with CoverProviders instance by invoking "CoverProviders::instance().AddCoverProvider(this)".
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// Providers are automatically unregistered from the repository when they are deleted.
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// The class is thread safe except for the initialization.
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class CoverProviders : public QObject {
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Q_OBJECT
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public:
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// This performs lazy initialization of the CoverProviders which is not thread-safe!
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static CoverProviders& instance() {
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static CoverProviders instance_;
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return instance_;
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}
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// Let's a cover provider to register itself in the repository.
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void AddCoverProvider(CoverProvider* provider);
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// Returns a list of the currently registered cover providers.
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const QList<CoverProvider*> List();
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~CoverProviders() {}
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private slots:
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void RemoveCoverProvider();
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private:
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CoverProviders();
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CoverProviders(CoverProviders const&);
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void operator=(CoverProviders const&);
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QList<CoverProvider*> cover_providers_;
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QMutex mutex_;
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};
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#endif // COVERPROVIDERS_H
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