/***************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact:  Qt Software Information (qt-info@nokia.com)
**
**
** Non-Open Source Usage
**
** Licensees may use this file in accordance with the Qt Beta Version
** License Agreement, Agreement version 2.2 provided with the Software or,
** alternatively, in accordance with the terms contained in a written
** agreement between you and Nokia.
**
** GNU General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the packaging
** of this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
**
** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt GPL Exception
** version 1.3, included in the file GPL_EXCEPTION.txt in this package.
**
***************************************************************************/

#ifndef PROCOMMANDMANAGER_H
#define PROCOMMANDMANAGER_H

#include "namespace_global.h"

#include <QtCore/QModelIndex>

QT_BEGIN_NAMESPACE
class ProItem;
QT_END_NAMESPACE

namespace Qt4ProjectManager {
namespace Internal {
    
class ProCommand
{
public:
    virtual ~ProCommand() {}
    virtual bool redo() = 0;
    virtual void undo() = 0;
};

class ProCommandGroup
{
public:
    ProCommandGroup(const QString &name);
    ~ProCommandGroup();

    void appendCommand(ProCommand *cmd);

    void undo();
    void redo();

private:
    QString m_name;
    QList<ProCommand *> m_commands;
};

class ProCommandManager : public QObject
{
    Q_OBJECT

public:
    ProCommandManager(QObject *parent);
    ~ProCommandManager();

    void beginGroup(const QString &name);
    void endGroup();

    // excutes the Command and adds it to the open group
    bool command(ProCommand *cmd);

    bool hasGroup() const;
    bool isDirty() const;

    void notifySave();

    bool canUndo() const;
    bool canRedo() const;

public slots:
    void undo();
    void redo();

signals:
    void modified();

private:
    ProCommandGroup *m_group;
    QList<ProCommandGroup *> m_groups;
    
    int m_pos;
    ProCommandGroup *m_savepoint;
};

} //namespace Internal
} //namespace Qt4ProjectManager

#endif // PROCOMMANDMANAGER_H