nevent1.hpp

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// LICENSE: (Please see the file COPYING for details)
//
// NUS - Nemesis Utilities System: A C++ application development framework 
// Copyright (C) 2006, 2008 Otavio Rodolfo Piske
//
//  This file is part of NUS
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation version 2.1
//  of the License.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
#ifndef NEVENT1_HPP
#define NEVENT1_HPP

template <typename Param1>
class NEvent1 {
      public:
            typedef NMap<nint32, NEventHandlerBase1<Param1> *> HandlersMap;
            
            NEvent1();
            
            virtual ~NEvent1();

            template <typename ListenerT>
            NEventId attach(ListenerT* object, 
                        void (ListenerT::*member)(Param1));
            
            bool detach(NEventId id);
            
            bool isAttached(NEventId id);
            
            void notify(Param1 param) const;

      private:
            HandlersMap m_handlers;
            int m_count;
};

template <typename Param1>
NEvent1<Param1>::NEvent1()
      : m_handlers(),
      m_count(0)
{}
      
template <typename Param1>
NEvent1<Param1>::~NEvent1() {

      for(typename HandlersMap::iterator it = m_handlers.begin(); 
               it != m_handlers.end();
                ++it)
      {
            delete it.value();
      }
}


template <typename Param1>
template <typename ListenerT>
NEventId NEvent1<Param1>::attach(ListenerT* object, 
                                    void (ListenerT::*member)(Param1)) 
{
      typedef void (ListenerT::*PtrMember)(Param1);
      
      NEventHandler1<ListenerT, Param1> *handle = 
                  new NEventHandler1<ListenerT, Param1>(object, member);
      
      m_handlers.insert(m_count, handle);
      m_count++;
      return m_count - 1;
}


// Finds the handler and, if it exists, remove it
template <typename Param1>
bool NEvent1<Param1>::detach(NEventId id) {
      typename HandlersMap::iterator it = m_handlers.find(id);

      if(it == m_handlers.end()) { 
            return false;
      }

      if (m_handlers.erase(it)) {
            delete it.value();
      }
      
      
      return true;
}

template <typename Param1>
bool NEvent1<Param1>::isAttached(NEventId id) {
      return m_handlers.find(id) != m_handlers.end();
}

template <typename Param1>
void NEvent1<Param1>::notify(Param1 param) const {
      
      for(typename HandlersMap::const_iterator it = m_handlers.constBegin();
               it != m_handlers.constEnd(); it++)
      {
            it.value()->notify(param);
      }
}

#endif // NEVENT1_HPP

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