117 lines
3.2 KiB
C++
117 lines
3.2 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) 2018 A. Stebich (librecad@mail.lordofbikes.de)
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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_UNDO_H
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#define RS_UNDO_H
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#include <memory>
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#include <vector>
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class RS_UndoCycle;
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class RS_Undoable;
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/**
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* Undo / redo functionality. The internal undo list consists of
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* RS_UndoCycle entries.
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*
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* @see RS_UndoCycle
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* @author Andrew Mustun
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*/
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class RS_Undo {
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public:
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virtual ~RS_Undo() = default;
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virtual bool undo();
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virtual bool redo();
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// virtual std::shared_ptr<RS_UndoCycle> getUndoCycle();
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// virtual std::shared_ptr<RS_UndoCycle> getRedoCycle();
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virtual int countUndoCycles();
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virtual int countRedoCycles();
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virtual bool hasUndoable();
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virtual void startUndoCycle();
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virtual void addUndoable(RS_Undoable* u);
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virtual void endUndoCycle();
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/**
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* Must be overwritten by the implementing class and delete
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* the given Undoable (unrecoverable). This method is called
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* for Undoables that are no longer in the undo buffer.
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*/
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virtual void removeUndoable(RS_Undoable* u) = 0;
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/**
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*\brief enable/disable redo/undo buttons in main application window
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*\author: Dongxu Li
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**/
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void setGUIButtons() const;
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friend std::ostream& operator << (std::ostream& os, RS_Undo& a);
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static bool test();
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private:
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void addUndoCycle(std::shared_ptr<RS_UndoCycle> const& i);
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//! List of undo list items. every item is something that can be undone.
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std::vector<std::shared_ptr<RS_UndoCycle>> undoList;
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/**
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* Index that points to the current position in the undo list.
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* The item it points on will be undone the next time undo is called.
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* The item after will be redone (if there is an item) when redo
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* is called.
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*/
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int undoPointer = -1;
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/**
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* Current undo cycle.
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*/
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std::shared_ptr<RS_UndoCycle> currentCycle {nullptr};
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int refCount {0}; ///< reference counter for nested start/end calls
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};
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/**
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* Stub for testing the RS_Undo class.
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*/
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#ifdef RS_TEST
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class RS_UndoStub : public RS_Undo {
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virtual void removeUndoable(RS_Undoable* u) {
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delete u;
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u = NULL;
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}
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};
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#endif
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#endif
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