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/***************************************************************************
UndoHandler.h - abstract base class for undo saving
-------------------
begin : Sat Feb 01 2014
copyright : (C) 2014 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef UNDO_HANDLER_H
#define UNDO_HANDLER_H
#include "config.h"
#include "libkwave_export.h"
#include <QtGlobal>
namespace Kwave
{
class UndoTransaction;
class LIBKWAVE_EXPORT UndoHandler
{
public:
/** Default constructor */
UndoHandler()
{}
/** Destructor */
virtual ~UndoHandler() {}
/**
* Called by an undo manager to notify the handler that
* it is time to save data for undo.
*
* @param undo an undo transaction to append some undo data
* @retval true if successful
* @retval false if saving undo data failed, e.g. out of memory
* or aborted
*/
virtual bool saveUndoData(Kwave::UndoTransaction &undo) = 0;
};
}
#endif /* UNDO_HANDLER_H */
//***************************************************************************
//***************************************************************************
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