Clementine-audio-player-Mac.../src/covers/coverproviders.h

66 lines
2.3 KiB
C++

/* This file is part of Clementine.
Copyright 2010, David Sansome <me@davidsansome.com>
Clementine is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Clementine 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 General Public License
along with Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef COVERPROVIDERS_H
#define COVERPROVIDERS_H
#include <QMutex>
#include <QObject>
class AlbumCoverFetcherSearch;
class CoverProvider;
class CoverProviderFactory;
// This is a singleton, a global repository for factories of cover providers. Each one of those has to register
// with CoverProviders' instance by invoking "CoverProviders::instance().AddCoverProviderFactory(this)".
// Factories are automatically unregistered from the repository when they are deleted.
// The class is thread safe except for the initialization.
class CoverProviders : public QObject {
Q_OBJECT
public:
// This performs lazy initialization of the CoverProviders which is not thread-safe!
static CoverProviders& instance() {
static CoverProviders instance_;
return instance_;
}
// Let's a cover provider factory to register itself in the repository.
void AddProviderFactory(CoverProviderFactory* factory);
// Creates a list of cover providers, one for every registered factory. Providers that get created will
// be children of the given AlbumCoverFetcherSearch's instance.
QList<CoverProvider*> List(AlbumCoverFetcherSearch* parent);
// Returns true if this repository has at least one registered provider factory.
bool HasAnyProviderFactories() { return !cover_provider_factories_.isEmpty(); }
~CoverProviders() {}
private slots:
void RemoveProviderFactory();
private:
CoverProviders();
CoverProviders(CoverProviders const&);
void operator=(CoverProviders const&);
QList<CoverProviderFactory*> cover_provider_factories_;
QMutex mutex_;
};
#endif // COVERPROVIDERS_H