// Subject.cc for FbTk // Copyright (c) 2002 - 2006 Henrik Kinnunen (fluxgen at fluxbox dot org) // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. #include "Subject.hh" #include "Observer.hh" #include <algorithm> #include <functional> namespace FbTk { Subject::SubjectList Subject::s_subjectlist; Subject::Subject():m_notify_mode(false) { s_subjectlist.push_back(this); } Subject::~Subject() { s_subjectlist.erase(std::remove(s_subjectlist.begin(), s_subjectlist.end(), this)); } void Subject::attach(Observer *obj) { m_observerlist.push_back(obj); // no need to have more than one instance of an observer m_observerlist.erase(std::unique(m_observerlist.begin(), m_observerlist.end()), m_observerlist.end()); } void Subject::detach(Observer *obj) { if (m_notify_mode) m_dead_observers.push_back(obj); else { m_observerlist.erase(std::remove(m_observerlist.begin(), m_observerlist.end(), obj), m_observerlist.end()); } } void Subject::notify() { ObserverList::iterator it = m_observerlist.begin(), it_end = m_observerlist.end(); for (; it != it_end; ++it) { m_notify_mode = true; (*it)->update(this); ObserverList::iterator d_it = m_dead_observers.begin(), d_it_end = m_dead_observers.end(); m_notify_mode = false; // there might be dead observers later in the list, so we must remove // them now for (; d_it != d_it_end; ++d_it) { if (*d_it == *it) --it; // don't invalidate our iterator detach(*d_it); } m_dead_observers.clear(); } } void Subject::removeObserver(Observer *obj) { std::for_each(s_subjectlist.begin(), s_subjectlist.end(), std::bind2nd(std::mem_fun(&Subject::detach), obj)); } } // end namespace FbTk