81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
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// Subject.cc for FbTk
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// Copyright (c) 2002 Henrik Kinnunen (fluxgen@fluxbox.org)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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// $Id: Subject.cc,v 1.1 2003/02/15 01:21:40 fluxgen Exp $
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#include "Subject.hh"
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#include "Observer.hh"
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#include <algorithm>
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#include <functional>
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namespace FbTk {
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Subject::SubjectList Subject::s_subjectlist;
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Subject::Subject() {
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s_subjectlist.push_back(this);
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}
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Subject::~Subject() {
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SubjectList::iterator it = s_subjectlist.begin();
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SubjectList::iterator it_end = s_subjectlist.end();
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for (; it != it_end; ++it) {
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if (this == (*it)) {
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s_subjectlist.erase(it);
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break;
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}
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}
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}
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void Subject::attach(Observer *obj) {
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m_observerlist.push_back(obj);
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// no need to have more than one instance of an observer
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std::unique(m_observerlist.begin(), m_observerlist.end());
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}
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void Subject::detach(Observer *obj) {
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ObserverList::iterator it = m_observerlist.begin();
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ObserverList::iterator it_end = m_observerlist.end();
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for (; it != it_end; ++it) {
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if (obj == (*it)) {
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m_observerlist.erase(it);
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break;
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}
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}
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}
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void Subject::notify() {
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ObserverList::iterator it = m_observerlist.begin();
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for (; it != m_observerlist.end(); ++it) {
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(*it)->update(this);
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}
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}
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void Subject::removeObserver(Observer *obj) {
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SubjectList::iterator it = s_subjectlist.begin();
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for(; it != s_subjectlist.end(); ++it) {
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(*it)->detach(obj);
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}
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}
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}; // end namespace FbTk
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