Signalv4ImplVC6.hxx

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00001 /*
00002  * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
00003  *                         UNIVERSITAT POMPEU FABRA
00004  *
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License
00017  * along with this program; if not, write to the Free Software
00018  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00019  *
00020  */
00021 
00022 #ifndef __SIGNALV4IMPLVC6__
00023 #define __SIGNALV4IMPLVC6__
00024 
00025 #ifndef __SIGNALV4__
00026 #error "This is an implementation header. You are not allowed to include it directly!"
00027 #endif
00028 
00029 #include <list>
00030 #include <utility>
00031 
00032 namespace SigSlot
00033 {
00034 
00035 template < typename ParmType1, typename ParmType2, typename ParmType3, typename ParmType4 >
00036         class Signalv4 : public Signal
00037 {
00038 
00039 public:
00040                 typedef typename CBL::Functor4<ParmType1,ParmType2,ParmType3,ParmType4>        tCallbackType;
00041 
00042 // Begin of "Connection Handler"
00043 
00044                 struct tCallback
00045                 {
00046                         tConnectionId  mConnection;
00047                         Slot*          mSlot;
00048                         tCallbackType  mCallback;
00049 
00050                         tCallback( tConnectionId id, Slot* slot, tCallbackType cb )
00051                                 : mConnection( id ), mSlot( slot ), mCallback( cb )
00052                         {
00053                         }
00054                 };
00055 
00056                 typedef tCallbackType*                                     tCallbackPtr;
00057                 typedef std::list<tCallbackPtr>                            tCallList;
00058                 typedef typename std::list<tCallbackPtr >::iterator        tCallIterator;
00059                 typedef std::list<tCallback>                               tCallbackList;
00060                 typedef typename std::list<tCallback>::iterator            tCbListIterator;
00061                 typedef typename std::list<tCallback>::const_iterator      const_tCbListIterator;
00062 
00063 
00064 protected:              
00065 
00066                 void AddCallback( tConnectionId pConnection, Slot* slot, tCallbackType cb )
00067                 {
00068                                 mCallbacks.push_back( tCallback( pConnection, slot, cb ) );
00069                 }
00070                 
00071                 bool HasNoCallbacks( ) const
00072                 {
00073                                 return mCallbacks.empty();
00074                 }
00075                 
00076                 tCallList& GetCalls( )
00077                 {
00078                                 mCalls.clear();
00079                                 
00080                                 tCbListIterator i   = mCallbacks.begin();
00081                                 tCbListIterator end = mCallbacks.end();
00082                                 
00083                                 while ( i!=end)
00084                                 {
00085                                                 mCalls.push_back( &(i->mCallback) );
00086                                                 i++;
00087                                 }
00088                                 
00089                                 return mCalls;
00090                 }
00091                 
00092                 void RemoveCall(  tConnectionId id )
00093                 {
00094                                 tCbListIterator i = mCallbacks.begin();
00095                                 tCbListIterator end = mCallbacks.end();
00096 
00097                                 while ( i!=end )
00098                                 {
00099                                                 if ( i->mConnection == id )
00100                                                 {
00101                                                                 mCallbacks.erase( i );
00102                                                                 break;
00103                                                 }
00104                                                 i++;
00105                                 }
00106                 }
00107 
00108                 void DestroyConnections()
00109                 {
00110                         tCbListIterator elem;
00111 
00112                         while ( !mCallbacks.empty() )
00113                         {
00114                                 elem = mCallbacks.begin();
00115 
00116                                 elem->mSlot->Unbind( elem->mConnection );
00117                         }
00118                 }
00119 
00120 // End of "ConnectionHandler"
00121                 
00122 public:
00123         
00124         virtual ~Signalv4()
00125         {
00126                 DestroyConnections();
00127         }
00128 
00129         void Connect( Slotv4<ParmType1, ParmType2, ParmType3, ParmType4>& slot )
00130         {
00131                 Connection c( AssignConnection(), this );
00132 
00133                 AddCallback( c.GetID(), &slot, slot.GetMethod() );
00134 
00135                 slot.Bind(c);
00136         }
00137         
00138         void Emit( ParmType1 parm1, ParmType2 parm2, ParmType3 parm3, ParmType4 parm4 )
00139         {
00140                 if ( HasNoCallbacks() )
00141                         return;
00142                 
00143                 tCallList calls = GetCalls();
00144                 tCallIterator i = calls.begin();
00145                 tCallIterator end = calls.end();
00146 
00147                 while ( i != end )
00148                         {
00149                                 (*(*i))( parm1, parm2, parm3, parm4 );
00150                                 i++;
00151                         }
00152                 
00153         }
00154 
00155         void FreeConnection( Connection* pConnection )
00156         {
00157                 RemoveCall( pConnection->GetID() );
00158                 FreeConnectionId( pConnection->GetID() );
00159         }
00160 
00161 private:
00162 
00163                 tCallList       mCalls;
00164                 tCallbackList   mCallbacks;
00165 
00166 
00167 };
00168 
00169 }
00170 
00171 
00172 
00173 #endif // Signalv4ImplVC6.hxx
00174 
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