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EventDispatcher.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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.
 *
 * $URL$
 * $Id$
 *
 */

#include "common/events.h"

namespace Common {

EventDispatcher::EventDispatcher() : _mapper(0) {
}

EventDispatcher::~EventDispatcher() {
      for (Common::List<SourceEntry>::iterator i = _sources.begin(); i != _sources.end(); ++i) {
            if (i->autoFree)
                  delete i->source;
      }

      for (Common::List<ObserverEntry>::iterator i = _observers.begin(); i != _observers.end(); ++i) {
            if (i->autoFree)
                  delete i->observer;
      }

      delete _mapper;
      _mapper = 0;
}

00048 void EventDispatcher::dispatch() {
      Common::Event event;

      for (Common::List<SourceEntry>::iterator i = _sources.begin(); i != _sources.end(); ++i) {
            const bool allowMapping = i->source->allowMapping();

            while (i->source->pollEvent(event)) {
                  // We only try to process the events via the setup event mapper, when
                  // we have a setup mapper and when the event source allows mapping.
                  if (_mapper && allowMapping) {
                        if (_mapper->notifyEvent(event)) {
                              // We allow the event mapper to create multiple events, when
                              // eating an event.
                              while (_mapper->pollEvent(event))
                                    dispatchEvent(event);

                              // Try getting another event from the current EventSource.
                              continue;
                        }
                  }

                  dispatchEvent(event);
            }
      }
}

00074 void EventDispatcher::registerMapper(EventMapper *mapper) {
      delete _mapper;
      _mapper = mapper;
}

00079 void EventDispatcher::registerSource(EventSource *source, bool autoFree) {
      SourceEntry newEntry;

      newEntry.source = source;
      newEntry.autoFree = autoFree;

      _sources.push_back(newEntry);
}

00088 void EventDispatcher::unregisterSource(EventSource *source) {
      for (Common::List<SourceEntry>::iterator i = _sources.begin(); i != _sources.end(); ++i) {
            if (i->source == source) {
                  if (i->autoFree)
                        delete source;

                  _sources.erase(i);
                  return;
            }
      }
}

00100 void EventDispatcher::registerObserver(EventObserver *obs, uint priority, bool autoFree) {
      ObserverEntry newEntry;

      newEntry.observer = obs;
      newEntry.priority = priority;
      newEntry.autoFree = autoFree;

      for (Common::List<ObserverEntry>::iterator i = _observers.begin(); i != _observers.end(); ++i) {
            if (i->priority < priority) {
                  _observers.insert(i, newEntry);
                  return;
            }
      }

      _observers.push_back(newEntry);
}

00117 void EventDispatcher::unregisterObserver(EventObserver *obs) {
      for (Common::List<ObserverEntry>::iterator i = _observers.begin(); i != _observers.end(); ++i) {
            if (i->observer == obs) {
                  if (i->autoFree)
                        delete obs;

                  _observers.erase(i);
                  return;
            }
      }
}

void EventDispatcher::dispatchEvent(const Event &event) {
      for (Common::List<ObserverEntry>::iterator i = _observers.begin(); i != _observers.end(); ++i) {
            if (i->observer->notifyEvent(event))
                  break;
      }
}

} // End of namespace Common


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