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**
** This file is part of the LibreCAD project, a 2D CAD program
**
** Copyright (C) 2025 Dongxu Li (dongxuli2011 at gmail.com)
** Copyright (C) 2018 A. Stebich (librecad@mail.lordofbikes.de)
** 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_UNDO_H
#define RS_UNDO_H
#include <memory>
#include <vector>
class RS_UndoCycle;
class RS_Undoable;
/**
* Undo / redo functionality. The internal undo list consists of
* RS_UndoCycle entries.
*
* @see RS_UndoCycle
* @author Andrew Mustun
*/
class RS_Undo {
public:
virtual ~RS_Undo() = default;
virtual bool undo();
virtual bool redo();
virtual int countUndoCycles();
virtual int countRedoCycles();
virtual bool hasUndoable();
virtual void startUndoCycle();
virtual void addUndoable(RS_Undoable* u);
virtual void endUndoCycle();
/**
* Must be overwritten by the implementing class and delete
* the given Undoable (unrecoverable). This method is called
* for Undoables that are no longer in the undo buffer.
*/
virtual void removeUndoable(RS_Undoable* u) = 0;
/**
*\brief enable/disable redo/undo buttons in main application window
*\author: Dongxu Li
**/
void updateUndoState() const;
void collectUndoState(bool &undoAvailable, bool &redoAvailable) const;
friend std::ostream& operator << (std::ostream& os, RS_Undo& a);
static bool test();
protected:
virtual void fireUndoStateChanged([[maybe_unused]]bool undoAvailable, [[maybe_unused]] bool redoAvailable) const {};
private:
void addUndoCycle(std::shared_ptr<RS_UndoCycle> undoCycle);
//! List of undo list items. every item is something that can be undone.
std::vector<std::shared_ptr<RS_UndoCycle>> undoList;
/**
* This is the iterator pointing to the first redoCycle, ready to be called for redo
* this iterator could be pointing to undoList.end(), indicating there's no cycle for redo
*/
decltype(undoList.cend()) m_redoPointer = undoList.cend();
/**
* Current undo cycle.
*/
std::shared_ptr<RS_UndoCycle> currentCycle;
int refCount {0}; ///< reference counter for nested start/end calls
};
/**
* Stub for testing the RS_Undo class.
*/
#ifdef RS_TEST
class RS_UndoStub : public RS_Undo {
virtual void removeUndoable(RS_Undoable* u) {
delete u;
u = NULL;
}
};
#endif
#endif
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