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/***************************************************************************
* Copyright (C) 2007-2009 by Ilya Kotov *
* forkotov02@hotmail.ru *
* *
* This program 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 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifndef _PLAYSTATE_H
#define _PLAYSTATE_H
#include "playlistmodel.h"
/*! @internal
* @brief Abstract class that represents data model playing states.
* @author Vladimir Kuznetsov <vovanec@gmail.com>
*/
class PlayState
{
public:
/*! Makes single step forward through songs list.
* If the step has done returns \b true, otherwise returns \b false
*/
virtual bool next() = 0;
/*! Makes single step back through songs list.
* If the step has done returns \b true, otherwise returns \b false
*/
virtual bool previous() = 0;
/*!
* Returns next item index.
*/
virtual int nextIndex() = 0;
/*!
* Service method, resets state to it's defaults.
*/
virtual void resetState()
{
;
}
/*!
* Service method, can be used for state initializing.
*/
virtual void prepare()
{
;
}
virtual ~PlayState()
{
;
}
PlayState(PlayListModel* model) : m_model(model)
{
;
}
protected:
/// Data model
PlayListModel* m_model;
};
/*! @internal
* @brief Represents normal playing state.
* @author Vladimir Kuznetsov <vovanec@gmail.com>
*/
class NormalPlayState : public PlayState
{
public:
virtual bool next();
virtual bool previous();
virtual int nextIndex();
NormalPlayState(PlayListModel* model);
};
/*! @internal
* @brief Represents shuffle playing state.
* @author Vladimir Kuznetsov <vovanec@gmail.com>
*/
class ShufflePlayState : public PlayState
{
public:
virtual bool next();
virtual bool previous();
virtual int nextIndex();
virtual void prepare();
ShufflePlayState(PlayListModel* model);
virtual void resetState();
private:
/// Current shuffled index.
int m_shuffled_current;
/// List of indexes used for shuffled playing.
QList<int> m_shuffled_indexes;
};
#endif
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