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**
** This file is part of the LibreCAD project, a 2D CAD program
**
** Copyright (C) 2010 R. van Twisk (librecad@rvt.dds.nl)
** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
**
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file gpl-2.0.txt included in the
** packaging of this file.
**
** 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
**
** This copyright notice MUST APPEAR in all copies of the script!
**
**********************************************************************/
#ifndef RS_UNDOABLE_H
#define RS_UNDOABLE_H
#include "rs.h"
#include "rs_flags.h"
/**
* Base class for something that can be added and deleted and every
* addition and deletion can be undone.
*
* @see RS_Undo
* @author Andrew Mustun
*/
class RS_Undoable : public RS_Flags {
public:
/**
* Runtime type identification for undoables.
* Note that this is voluntarily. The default implementation
* returns RS2::UndoableUnknown.
*/
virtual RS2::UndoableType undoRtti() const {
return RS2::UndoableUnknown;
}
void changeUndoState();
void setUndoState(bool undone);
bool isUndone() const;
/**
* Can be overwritten by the implementing class to be notified
* when the undo state changes (the undoable becomes visible / invisible).
*/
virtual void undoStateChanged(bool undone) = 0;
};
#endif
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