/* -*- C++ -*-

  $Id: CommandHistory.h,v 1.3 1999/01/28 08:33:42 sattler Exp $

  This file is part of KIllustrator.
  Copyright (C) 1998 Kai-Uwe Sattler (kus@iti.cs.uni-magdeburg.de)

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU Library 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 Library General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef CommandHistory_h_
#define CommandHistory_h_

#include "Command.h"

#include <qlist.h>

class CommandHistory : public QObject {
  Q_OBJECT

public:
  CommandHistory ();
  ~CommandHistory() {};

  void addCommand (Command *cmd, bool exec = false);
  void undo ();
  void redo ();

  void reset ();

  bool isUndoPossible() const { return (index > 0); } 
  bool isRedoPossible() const { return (index < history.count()); }

  QString getUndoName(); 
  QString getRedoName();

  void dump ();

signals:
  void changed(bool undoPossible, bool redoPossible);

private:
  QList<Command> history;
  unsigned int index;
};

#endif
