64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/****************************************************************************
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**
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** This file is part of the LibreCAD project, a 2D CAD program
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**
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** Copyright (C) 2010 R. van Twisk (librecad@rvt.dds.nl)
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** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
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**
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**
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** This file may be distributed and/or modified under the terms of the
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** GNU General Public License version 2 as published by the Free Software
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** Foundation and appearing in the file gpl-2.0.txt included in the
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** packaging of this file.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**
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** This copyright notice MUST APPEAR in all copies of the script!
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**
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**********************************************************************/
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#ifndef RS_UNDOABLE_H
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#define RS_UNDOABLE_H
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#include "rs.h"
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#include "rs_flags.h"
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/**
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* Base class for something that can be added and deleted and every
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* addition and deletion can be undone.
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*
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* @see RS_Undo
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* @author Andrew Mustun
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*/
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class RS_Undoable : public RS_Flags {
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public:
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/**
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* Runtime type identification for undoables.
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* Note that this is voluntarily. The default implementation
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* returns RS2::UndoableUnknown.
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*/
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virtual RS2::UndoableType undoRtti() const {
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return RS2::UndoableUnknown;
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}
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void changeUndoState();
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void setUndoState(bool undone);
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bool isUndone() const;
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/**
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* Can be overwritten by the implementing class to be notified
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* when the undo state changes (the undoable becomes visible / invisible).
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*/
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virtual void undoStateChanged(bool undone) = 0;
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};
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#endif
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