eventdispatcher.cpp

来自「This software aims to create an applet a」· C++ 代码 · 共 177 行

//
// EventDispatcher.cpp
//
// $Id: //poco/Main/XML/src/EventDispatcher.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#include "DOM/EventDispatcher.h"
#include "DOM/Event.h"
#include "DOM/EventListener.h"


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


XML_BEGIN


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;
	}
}


XML_END