/*
 * 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
 * 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.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 */

/** \file
 * \ingroup GHOST
 * Declaration of GHOST_IEventConsumer interface class.
 */

#ifndef __GHOST_IEVENTCONSUMER_H__
#define __GHOST_IEVENTCONSUMER_H__

#include "GHOST_IEvent.h"

/**
 * Interface class for objects interested in receiving events.
 * Objects interested in events should inherit this class and implement the
 * processEvent() method. They should then be registered with the system that
 * they want to receive events. The system will call the processEvent() method
 * for every installed event consumer to pass events.
 * \see GHOST_ISystem#addEventConsumer
 */
class GHOST_IEventConsumer {
 public:
  /**
   * Destructor.
   */
  virtual ~GHOST_IEventConsumer()
  {
  }

  /**
   * This method is called by the system when it has events to dispatch.
   * \see GHOST_ISystem#dispatchEvents
   * \param   event   The event that can be handled or ignored.
   * \return  Indication as to whether the event was handled.
   */
  virtual bool processEvent(GHOST_IEvent *event) = 0;

#ifdef WITH_CXX_GUARDEDALLOC
  MEM_CXX_CLASS_ALLOC_FUNCS("GHOST:GHOST_IEventConsumer")
#endif
};

#endif /* __GHOST_IEVENTCONSUMER_H__ */
