updatemanager.h

/*
 For general Scribus (>=1.3.2) copyright and licensing information please refer
 to the COPYING file provided with the program. Following this notice may exist
 a copyright and/or license notice that predates the release of Scribus 1.3.2
 for which a new license (GPL+exception) is in place.
 */
/***************************************************************************
*                                                                         *
*   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.                                   *
*                                                                         *
***************************************************************************/

#ifndef UPDATEMANAGER_H
#define UPDATEMANAGER_H

#include "scribusapi.h"

#include <QSet>



struct SCRIBUS_API UpdateMemento
{
    virtual ~UpdateMemento();
};



class SCRIBUS_API UpdateManaged
{
public:
    virtual void updateNow(UpdateMemento* what) = 0;
    virtual ~UpdateManaged() {}
};


class SCRIBUS_API UpdateManager
{
    int m_updatesDisabled;
    QSet<QPair<UpdateManaged*, UpdateMemento*> > m_pending;
    
public:
    UpdateManager() : m_updatesDisabled(0), m_pending() {}
    virtual ~UpdateManager();
    
    void setUpdatesEnabled(bool val=true);
    void setUpdatesDisabled() { setUpdatesEnabled(false); };
    bool updatesEnabled() { return m_updatesDisabled == 0; };
    bool requestUpdate(UpdateManaged* observable, UpdateMemento* what);
};



#endif