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 *   Copyright (C) 2005 by Riku Leino                                      *
 *                                                      *
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *


#include <qstring.h>
#include "undostate.h"

 * @brief Superclass for all objects that are wanted to have undoable actions.
 * The most important feature of UndoObject is the restore() method which must be
 * implemented in the subclass. When an action that is wanted to be undoable
 * happens UndoObject subclass must use UndoManager::action() method to store the
 * action using UndoState object. Then when a user undos this action UndoManager
 * will send the UndoState object back to this UndoObject by using the restore()
 * method.
 * What is needed for an undo/redo:
        <li>UndoObject creates an UndoState object describing the action</li>
        <li>Sends it to the UndoManager</li>
        <li>When an undo/redo is requested UndoManager will send this very same UndoState
        object back to the UndoObject which then uses it to restore the state.</li>
 * @author Riku Leino
 * @date December 2004

class UndoObject
        /** @brief id number to be used with the next UndoObject */
        static ulong nextId;

        /** @brief unique id number */
        ulong _id;

         * @brief Name of the UndoObject
         * This name will be used in UndoGui implementations

        QString uname;
        /** @brief Creates a new anonymous UndoObject instance  */

         * @brief Creates a new UndoObject instance with the name <code>objectName</code>
         * @param objectName Name of the UndoObject

        UndoObject(QString objectName);

        /** @brief Destroys the object. */
        virtual ~UndoObject() {};

         * @brief Returns the name of the UndoObject.
         * @return the name of the UndoObject

        virtual QString getUName();

         * @brief Set the name of the UndoObject
         * @param newUName New name for the UndoObject

        virtual void setUName(QString newUName);

         * @brief Returns an unique identifier number for the UndoObject
         * @return unique identifier number for the UndoObjet

        virtual ulong getUId();

         * @brief Method used when an undo/redo is requested.
         * UndoObject must know how to handle the UndoState object given as a
         * parameter. It is the same object that was send from the UndoObject to
         * the UndoManager when the action happened.
         * @param state State describing the action that is wanted to be undone/redone
         * @param isUndo If true undo is wanted else if false redo.

        virtual void restore(UndoState* state, bool isUndo) = 0;