101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
|
/*
|
||
|
|
* Strawberry Music Player
|
||
|
|
* This file was part of Clementine.
|
||
|
|
* Copyright 2010, David Sansome <me@davidsansome.com>
|
||
|
|
*
|
||
|
|
* Strawberry 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.
|
||
|
|
*
|
||
|
|
* Strawberry 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 Strawberry. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef PLAYLISTGENERATOR_H
|
||
|
|
#define PLAYLISTGENERATOR_H
|
||
|
|
|
||
|
|
#include "config.h"
|
||
|
|
|
||
|
|
#include <memory>
|
||
|
|
|
||
|
|
#include <QObject>
|
||
|
|
#include <QByteArray>
|
||
|
|
#include <QString>
|
||
|
|
|
||
|
|
#include "playlist/playlistitem.h"
|
||
|
|
|
||
|
|
class CollectionBackend;
|
||
|
|
|
||
|
|
class PlaylistGenerator : public QObject, public std::enable_shared_from_this<PlaylistGenerator> {
|
||
|
|
Q_OBJECT
|
||
|
|
|
||
|
|
public:
|
||
|
|
explicit PlaylistGenerator();
|
||
|
|
|
||
|
|
static const int kDefaultLimit;
|
||
|
|
static const int kDefaultDynamicHistory;
|
||
|
|
static const int kDefaultDynamicFuture;
|
||
|
|
|
||
|
|
enum Type {
|
||
|
|
Type_None = 0,
|
||
|
|
Type_Query = 1
|
||
|
|
};
|
||
|
|
|
||
|
|
// Creates a new PlaylistGenerator of the given type
|
||
|
|
static std::shared_ptr<PlaylistGenerator> Create(const Type type = Type_Query);
|
||
|
|
|
||
|
|
// Should be called before Load on a new PlaylistGenerator
|
||
|
|
void set_collection(CollectionBackend *backend) { backend_ = backend; }
|
||
|
|
void set_name(const QString &name) { name_ = name; }
|
||
|
|
CollectionBackend *collection() const { return backend_; }
|
||
|
|
QString name() const { return name_; }
|
||
|
|
|
||
|
|
// Name of the subclass
|
||
|
|
virtual Type type() const = 0;
|
||
|
|
|
||
|
|
// Serializes the PlaylistGenerator's settings
|
||
|
|
// Called on UI-thread.
|
||
|
|
virtual void Load(const QByteArray &data) = 0;
|
||
|
|
// Called on UI-thread.
|
||
|
|
virtual QByteArray Save() const = 0;
|
||
|
|
|
||
|
|
// Creates and returns a playlist
|
||
|
|
// Called from non-UI thread.
|
||
|
|
virtual PlaylistItemList Generate() = 0;
|
||
|
|
|
||
|
|
// If the generator can be used as a dynamic playlist then GenerateMore should return the next tracks in the sequence.
|
||
|
|
// The subclass should remember the last GetDynamicHistory() + GetDynamicFuture() tracks,
|
||
|
|
// and ensure that the tracks returned from this method are not in that set.
|
||
|
|
virtual bool is_dynamic() const { return false; }
|
||
|
|
virtual void set_dynamic(const bool dynamic) { Q_UNUSED(dynamic); }
|
||
|
|
// Called from non-UI thread.
|
||
|
|
virtual PlaylistItemList GenerateMore(int count) {
|
||
|
|
Q_UNUSED(count);
|
||
|
|
return PlaylistItemList();
|
||
|
|
}
|
||
|
|
|
||
|
|
virtual int GetDynamicHistory() { return kDefaultDynamicHistory; }
|
||
|
|
virtual int GetDynamicFuture() { return kDefaultDynamicFuture; }
|
||
|
|
|
||
|
|
signals:
|
||
|
|
void Error(const QString& message);
|
||
|
|
|
||
|
|
protected:
|
||
|
|
CollectionBackend *backend_;
|
||
|
|
|
||
|
|
private:
|
||
|
|
QString name_;
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
#include "playlistgenerator_fwd.h"
|
||
|
|
|
||
|
|
#endif // PLAYLISTGENERATOR_H
|