source: XMLIO_V2/external/src/POCO/XML/EventDispatcher.cpp @ 80

//
// EventDispatcher.cpp
//
// $Id: //poco/1.3/XML/src/EventDispatcher.cpp#1 $
//
// Library: XML
// Package: DOM
// Module:  DOMEvents
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// 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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include <Poco/DOM/EventDispatcher.h>
#include <Poco/DOM/Event.h>
#include <Poco/DOM/EventListener.h>


namespace 
{
        class DispatchGuard
        {
        public:
                DispatchGuard(int& count):
                        _count(count)
                {
                        ++_count;
                }
                
                ~DispatchGuard()
                {
                        --_count;
                }
                
        private:
                int& _count;
        };
}


namespace Poco {
namespace XML {


EventDispatcher::EventDispatcher():
        _inDispatch(0)
{
}

        
EventDispatcher::~EventDispatcher()
{
}


void EventDispatcher::addEventListener(const XMLString& type, EventListener* listener, bool useCapture)
{
        EventListenerItem item;
        item.type       = type;
        item.pListener  = listener;
        item.useCapture = useCapture;
        _listeners.push_front(item);
}


void EventDispatcher::removeEventListener(const XMLString& type, EventListener* listener, bool useCapture)
{
        EventListenerList::iterator it = _listeners.begin();
        while (it != _listeners.end())
        {
                if (it->type == type && it->pListener == listener && it->useCapture == useCapture)
                {
                        it->pListener = 0;
                }
                if (!_inDispatch && !it->pListener)
                {
                        EventListenerList::iterator del = it++;
                        _listeners.erase(del);
                }
                else ++it;
        }
}


void EventDispatcher::dispatchEvent(Event* evt)
{
        DispatchGuard guard(_inDispatch);
        EventListenerList::iterator it = _listeners.begin();
        while (it != _listeners.end())
        {
                if (it->pListener && it->type == evt->type())
                {
                        it->pListener->handleEvent(evt);
                }
                if (!it->pListener)
                {
                        EventListenerList::iterator del = it++;
                        _listeners.erase(del);
                }
                else ++it;
        }
}


void EventDispatcher::captureEvent(Event* evt)
{
        DispatchGuard guard(_inDispatch);
        EventListenerList::iterator it = _listeners.begin();
        while (it != _listeners.end())
        {
                if (it->pListener && it->useCapture && it->type == evt->type())
                {
                        it->pListener->handleEvent(evt);
                }
                if (!it->pListener)
                {
                        EventListenerList::iterator del = it++;
                        _listeners.erase(del);
                }
                else ++it;
        }
}


void EventDispatcher::bubbleEvent(Event* evt)
{
        DispatchGuard guard(_inDispatch);
        EventListenerList::iterator it = _listeners.begin();
        while (it != _listeners.end())
        {
                if (it->pListener && !it->useCapture && it->type == evt->type())
                {
                        it->pListener->handleEvent(evt);
                }
                if (!it->pListener)
                {
                        EventListenerList::iterator del = it++;
                        _listeners.erase(del);
                }
                else ++it;
        }
}


} } // namespace Poco::XML