Signalv0ImplVC6.hxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef __SIGNALV0IMPLVC6__
#define __SIGNALV0IMPLVC6__

#ifndef __SIGNALV0__
#error "This is an internal implementation header. You are not allowed to include it directly!"
#endif

namespace SigSlot
{

        class Signalv0 
                : public Signal
        {
        public:
                typedef CBL::Functor0     tCallbackType;
                // Begin of ConnectionHandler
                struct tCallback
                {
                        tConnectionId  mConnection;
                        Slot*          mSlot;
                        tCallbackType  mCallback;
    
                        tCallback( tConnectionId id, Slot* slot, tCallbackType cb )
                                : mConnection( id ), mSlot( slot ), mCallback( cb )
                        {
                        }
                };
  
                typedef tCallbackType*                                     tCallbackPtr;
                typedef std::list<tCallbackPtr>                            tCallList;
                typedef std::list<tCallbackPtr >::iterator        tCallIterator;
                typedef std::list<tCallback>                               tCallbackList;
                typedef std::list<tCallback>::iterator            tCbListIterator;
                typedef std::list<tCallback>::const_iterator      const_tCbListIterator;
  
  
        protected:              
  
                void AddCallback( tConnectionId pConnection, Slot* slot, tCallbackType cb )
                {
                        mCallbacks.push_back( tCallback( pConnection, slot, cb ) );
                }
  
                bool HasNoCallbacks( ) const
                {
                        return mCallbacks.empty();
                }
  
                tCallList& GetCalls( )
                {
                        mCalls.clear();
    
                        tCbListIterator i   = mCallbacks.begin();
                        tCbListIterator end = mCallbacks.end();
    
                        while ( i!=end)
                        {
                                mCalls.push_back( &(i->mCallback) );
                                i++;
                        }
    
                        return mCalls;
                }
  
                void RemoveCall(  tConnectionId id )
                {
                        tCbListIterator i = mCallbacks.begin();
                        tCbListIterator end = mCallbacks.end();
    
                        while ( i!=end )
                        {
                                if ( i->mConnection == id )
                                {
                                        mCallbacks.erase( i );
                                        break;
                                }
                                i++;
                        }
                }
  
                void DestroyConnections()
                {
                        tCbListIterator elem;
    
                        while ( !mCallbacks.empty() )
                        {
                                elem = mCallbacks.begin();
        
                                elem->mSlot->Unbind( elem->mConnection );
                        }
                }
                // End of "ConnectionHandler"
        public:
                virtual ~Signalv0()
                {
                        DestroyConnections();
                }
  
  
                void Connect( Slotv0& slot )
                {
                        Connection c ( AssignConnection(), this );
    
                        AddCallback( c.GetID(), &slot, slot.GetMethod() );
    
                        slot.Bind(c);
                }
  
                void Emit()
                {
                        if ( HasNoCallbacks() )
                                return;
    
                        tCallList calls = GetCalls();
                        tCallIterator i = calls.begin();
                        tCallIterator end = calls.end();
    
                        while( i != end )
                        {
                                (*(*i))();
                                i++;
                        }
                }
  
                void FreeConnection( Connection* pConnection )
                {
                        RemoveCall( pConnection->GetID() );
                        FreeConnectionId( pConnection->GetID() );
                }

        private:
  
                tCallList       mCalls;
                tCallbackList   mCallbacks;
  
  
        };

}

#endif // Signalv0ImplVC6.hxx