undolib.h

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/*
 Copyright (C) 2001-2006, William Joseph.
 All Rights Reserved.

 This file is part of GtkRadiant.

 GtkRadiant 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.

 GtkRadiant 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 GtkRadiant; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined (INCLUDED_UNDOLIB_H)
#define INCLUDED_UNDOLIB_H

#include "iundo.h"
#include "mapfile.h"
#include "generic/callback.h"

template<typename Copyable>
class BasicUndoMemento: public UndoMemento
{
        Copyable m_data;
    public:
        BasicUndoMemento (const Copyable& data) :
            m_data(data)
        {
        }

        const Copyable& get () const
        {
            return m_data;
        }
};

template<typename Copyable>
class ObservedUndoableObject: public Undoable
{
        typedef Callback1<const Copyable&> ImportCallback;

        Copyable& m_object;
        ImportCallback m_importCallback;
        UndoObserver* m_undoQueue;
        MapFile* m_map;
    public:

        ObservedUndoableObject<Copyable> (Copyable& object, const ImportCallback& importCallback) :
            m_object(object), m_importCallback(importCallback), m_undoQueue(0), m_map(0)
        {
        }
        ~ObservedUndoableObject ()
        {
        }

        MapFile* map ()
        {
            return m_map;
        }

        void instanceAttach (MapFile* map)
        {
            m_map = map;
            m_undoQueue = GlobalUndoSystem().observer(this);
        }
        void instanceDetach (MapFile* map)
        {
            m_map = 0;
            m_undoQueue = 0;
            GlobalUndoSystem().release(this);
        }

        void save ()
        {
            if (m_map != 0) {
                m_map->changed();
            }
            if (m_undoQueue != 0) {
                m_undoQueue->save(this);
            }
        }

        UndoMemento* exportState () const
        {
            return new BasicUndoMemento<Copyable> (m_object);
        }
        void importState (const UndoMemento* state)
        {
            save();
            m_importCallback((static_cast<const BasicUndoMemento<Copyable>*> (state))->get());
        }
};

template<typename Copyable>
class UndoableObject: public Undoable
{
        Copyable& m_object;
        UndoObserver* m_undoQueue;
        MapFile* m_map;

    public:
        UndoableObject (Copyable& object) :
            m_object(object), m_undoQueue(0), m_map(0)
        {
        }
        ~UndoableObject ()
        {
        }

        void instanceAttach (MapFile* map)
        {
            m_map = map;
            m_undoQueue = GlobalUndoSystem().observer(this);
        }
        void instanceDetach (MapFile* map)
        {
            m_map = 0;
            m_undoQueue = 0;
            GlobalUndoSystem().release(this);
        }

        void save ()
        {
            if (m_map != 0) {
                m_map->changed();
            }
            if (m_undoQueue != 0) {
                m_undoQueue->save(this);
            }
        }

        UndoMemento* exportState () const
        {
            return new BasicUndoMemento<Copyable> (m_object);
        }
        void importState (const UndoMemento* state)
        {
            save();
            m_object = (static_cast<const BasicUndoMemento<Copyable>*> (state))->get();
        }
};

#endif