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/*
* This file is part of libdom.
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2009 Bo Yang <struggleyb.nku@gmail.com>
*/
#include <stdlib.h>
#include "events/event_listener.h"
#include "core/document.h"
/**
* Create an EventListener
*
* \param doc The document object
* \param handler The event function
* \param pw The private data
* \param listener The returned EventListener
* \return DOM_NO_ERR on success, DOM_NO_MEM_ERR on memory exhaustion.
*/
dom_exception dom_event_listener_create(struct dom_document *doc,
handle_event handler, void *pw, dom_event_listener **listener)
{
dom_event_listener *ret = malloc(sizeof(dom_event_listener));
if (ret == NULL)
return DOM_NO_MEM_ERR;
ret->handler = handler;
ret->pw = pw;
ret->refcnt = 1;
ret->doc = doc;
*listener = ret;
return DOM_NO_ERR;
}
/**
* Claim a new reference on the listener object
*
* \param listener The EventListener object
*/
void dom_event_listener_ref(dom_event_listener *listener)
{
listener->refcnt++;
}
/**
* Release a reference on the listener object
*
* \param listener The EventListener object
*/
void dom_event_listener_unref(dom_event_listener *listener)
{
if (listener->refcnt > 0)
listener->refcnt--;
if (listener->refcnt == 0)
free(listener);
}
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