103 lines
2.9 KiB
C++
103 lines
2.9 KiB
C++
/**
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* @file lleventemitter.h
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* @brief General event emitter class
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*
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* $LicenseInfo:firstyear=2005&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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// header guard
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#ifndef LL_EVENTEMITTER_H
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#define LL_EVENTEMITTER_H
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// standard headers
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#include <algorithm>
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#include <typeinfo>
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#include <iostream>
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#include <string>
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#include <list>
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#include "stdtypes.h"
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///////////////////////////////////////////////////////////////////////////////
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// templatized emitter class
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template < class T >
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class eventEmitter
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{
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public:
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typedef typename T::EventType EventType;
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typedef std::list< T* > ObserverContainer;
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typedef void ( T::*observerMethod )( const EventType& );
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protected:
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ObserverContainer observers;
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public:
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eventEmitter () { };
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~eventEmitter () { };
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///////////////////////////////////////////////////////////////////////////////
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//
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bool addObserver ( T* observerIn )
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{
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if ( ! observerIn )
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return false;
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// check if observer already exists
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if ( std::find ( observers.begin (), observers.end (), observerIn ) != observers.end () )
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return false;
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// save it
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observers.push_back ( observerIn );
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return true;
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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bool remObserver ( T* observerIn )
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{
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if ( ! observerIn )
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return false;
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observers.remove ( observerIn );
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return true;
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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void update ( observerMethod method, const EventType& msgIn )
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{
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typename std::list< T* >::iterator iter = observers.begin ();
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while ( iter != observers.end () )
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{
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( ( *iter )->*method ) ( msgIn );
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++iter;
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};
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};
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};
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#endif // lleventemitter_h
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