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// 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.
// $Id$
#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() {
m_notify_mode = true;
std::for_each(m_observerlist.begin(), m_observerlist.end(),
std::bind2nd(std::mem_fun(&Observer::update), this));
m_notify_mode = false;
// remove dead observers
if (m_dead_observers.size()) {
std::for_each(m_dead_observers.begin(),
m_dead_observers.end(),
std::bind1st(std::mem_fun(&Subject::detach), this));
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
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