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diff --git a/src/qmmpui/playstate.h b/src/qmmpui/playstate.h
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+/***************************************************************************
+ *   Copyright (C) 2006 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
+
+/**
+   @author Vladimir Kuznetsov <vovanec@gmail.com>
+ */
+
+#include <playlistmodel.h>
+
+/*!
+ * Abstract class that represents data model playing states
+ */
+class PlayState
+{
+public:
+    /*! Makes single step forward through songs list.
+     *  If the step has done returns \b true, otherwise \b false
+     */
+    virtual bool next() = 0;
+
+    /*! Makes single step back through songs list.
+     *  If the step has done returns \b true, otherwise \b false
+     */
+    virtual bool previous() = 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;
+};
+
+/*!
+ *  Represents normal playing state.
+ *  @author Vladimir Kuznetsov <vovanec@gmail.com>
+ */
+class NormalPlayState : public PlayState
+{
+public:
+    virtual bool next();
+    virtual bool previous();
+    NormalPlayState(PlayListModel* model);
+};
+
+/*!
+ *  Represents shuffle playing state.
+ *  @author Vladimir Kuznetsov <vovanec@gmail.com>
+ */
+class ShufflePlayState : public PlayState
+{
+public:
+    virtual bool next();
+    virtual bool previous();
+    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