Signalv2ImplVC6.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 __SIGNALV2IMPLVC6__
#define __SIGNALV2IMPLVC6__

#ifndef __SIGNALV2__
#error "This is an implementation header. You are not allowed to include it directly!"
#endif

#include <list>
#include <utility>

namespace SigSlot
{

template < typename ParmType1, typename ParmType2 >
        class Signalv2 : public Signal
{

public:
                typedef typename CBL::Functor2<ParmType1,ParmType2>        tCallbackType;

// Begin of "Connection Handler"

                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 typename std::list<tCallbackPtr >::iterator        tCallIterator;
                typedef std::list<tCallback>                               tCallbackList;
                typedef typename std::list<tCallback>::iterator            tCbListIterator;
                typedef typename 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 ~Signalv2()
        {
                DestroyConnections();
        }

        void Connect( Slotv2<ParmType1,ParmType2>& slot )
        {
                Connection c( AssignConnection(), this );

                AddCallback( c.GetID(), &slot, slot.GetMethod() );

                slot.Bind(c);
        }

        
        void Emit( ParmType1 parm1, ParmType2 parm2 )
        {
                if ( HasNoCallbacks() )
                        return;
                
                tCallList calls = GetCalls();
                tCallIterator i = calls.begin();
                tCallIterator end = calls.end();

                while ( i != end )
                        {
                                (*(*i))( parm1, parm2 );
                                i++;
                        }
                
        }

        void FreeConnection( Connection* pConnection )
        {
                RemoveCall( pConnection->GetID() );
                FreeConnectionId( pConnection->GetID() );
        }

private:

                tCallList       mCalls;
                tCallbackList   mCallbacks;


};

}



#endif // Signalv2ImplVC6.hxx