/*  -*- mode: C++; c-file-style: "gnu" -*-
 *
 *  This file is part of KMail, the KDE mail client.
 *  Copyright (c) 2003 Carsten Burghardt <burghardt@kde.org>
 *
 *  KMail is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License, version 2, as
 *  published by the Free Software Foundation.
 *
 *  KMail 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  In addition, as a special exception, the copyright holders give
 *  permission to link the code of this program with any edition of
 *  the TQt library by Trolltech AS, Norway (or with modified versions
 *  of TQt that use the same license as TQt), and distribute linked
 *  combinations including the two.  You must obey the GNU General
 *  Public License in all respects for all of the code used other than
 *  TQt.  If you modify this file, you may extend this exception to
 *  your version of the file, but you are not obligated to do so.  If
 *  you do not wish to do so, delete this exception statement from
 *  your version.
 */

#ifndef __KMAIL_ISUBJECT_H__
#define __KMAIL_ISUBJECT_H__

#include "interfaces/observable.h"

#include <tqvaluevector.h>

namespace KMail {

  namespace Interface {
    class Observer;
  }

  class ISubject : public Interface::Observable {
  public :
      virtual ~ISubject();

      /** \reimp Attach the observer if it is not in the list yet */ 
      void attach( Interface::Observer * );

      /** \reimp Detach the observer */ 
      void detach( Interface::Observer * );

      /** \reimp Notify all observers ( call observer->update() ) */ 
      void notify();

  private:
      TQValueVector<Interface::Observer*> mObserverList;
  };

} // namespace KMail

#endif // __KMAIL_ISUBJECT_H__