/home/pete/Work/TSE3.svn/tse3/src/tse3/cmd/CommandHistory.h

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/*
 * @(#)cmd/CommandHistory.h 3.00 10 June 1999
 *
 * Copyright (c) 2000 Pete Goodliffe (pete@cthree.org)
 *
 * This file is part of TSE3 - the Trax Sequencer Engine version 3.00.
 *
 * This library is modifiable/redistributable under the terms of the GNU
 * General Public License.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING. If not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

#ifndef TSE3_CMD_COMMANDHISTORY_H
#define TSE3_CMD_COMMANDHISTORY_H

#include "tse3/listen/cmd/CommandHistory.h"

#include "tse3/Notifier.h"
#include "tse3/cmd/Command.h"

#include <list>
#include <cstddef>

namespace TSE3
{
    namespace Cmd
    {
        class CommandHistory : public TSE3::Notifier<CommandHistoryListener>
        {
            public:

                CommandHistory(int limit = defaultLimit);

                void add(Command *command);

                bool undos() const;

                void undo();

                Command *undoCommand(size_t pos);

                bool redos() const;

                void redo();

                Command *redoCommand(size_t pos);

                int limit() const;

                void setLimit(int limit);

                void clear()
                {
                    clearUndos();
                    clearRedos();
                }

                void clearUndos();

                void clearRedos();

                static const int defaultLimit = 20;

            private:

                int _limit;
                std::list<Command*> undolist;
                std::list<Command*> redolist;
        };
    }
}

#endif

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