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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 <assert.h>
#include <stdlib.h>
#include "events/event.h"
#include "events/event_listener.h"
#include "events/event_target.h"
#include "core/document.h"
#include "core/node.h"
#include "core/string.h"
#include "utils/utils.h"
#include "utils/validate.h"
static void event_target_destroy_listeners(struct listener_entry *list)
{
struct listener_entry *next = NULL;
for (; list != next; list = next) {
next = (struct listener_entry *) list->list.next;
list_del(&list->list);
dom_event_listener_unref(list->listener);
dom_string_unref(list->type);
free(list);
}
}
/* Initialise this EventTarget */
dom_exception _dom_event_target_internal_initialise(
dom_event_target_internal *eti)
{
eti->listeners = NULL;
return DOM_NO_ERR;
}
/* Finalise this EventTarget */
void _dom_event_target_internal_finalise(dom_event_target_internal *eti)
{
if (eti->listeners != NULL)
event_target_destroy_listeners(eti->listeners);
}
/*-------------------------------------------------------------------------*/
/* The public API */
/**
* Add an EventListener to the EventTarget
*
* \param et The EventTarget object
* \param type The event type which this event listener listens for
* \param listener The event listener object
* \param capture Whether add this listener in the capturing phase
* \return DOM_NO_ERR on success, appropriate dom_exception on failure.
*/
dom_exception _dom_event_target_add_event_listener(
dom_event_target_internal *eti,
dom_string *type, struct dom_event_listener *listener,
bool capture)
{
struct listener_entry *le = NULL;
le = malloc(sizeof(struct listener_entry));
if (le == NULL)
return DOM_NO_MEM_ERR;
/* Initialise the listener_entry */
list_init(&le->list);
le->type = dom_string_ref(type);
le->listener = listener;
dom_event_listener_ref(listener);
le->capture = capture;
if (eti->listeners == NULL) {
eti->listeners = le;
} else {
list_append(&eti->listeners->list, &le->list);
}
return DOM_NO_ERR;
}
/**
* Remove an EventListener from the EventTarget
*
* \param et The EventTarget object
* \param type The event type this listener is registered for
* \param listener The listener object
* \param capture Whether the listener is registered at the capturing phase
* \return DOM_NO_ERR on success, appropriate dom_exception on failure.
*/
dom_exception _dom_event_target_remove_event_listener(
dom_event_target_internal *eti,
dom_string *type, struct dom_event_listener *listener,
bool capture)
{
if (eti->listeners != NULL) {
struct listener_entry *le = eti->listeners;
do {
if (dom_string_isequal(le->type, type) &&
le->listener == listener &&
le->capture == capture) {
list_del(&le->list);
dom_event_listener_unref(le->listener);
dom_string_unref(le->type);
free(le);
break;
}
le = (struct listener_entry *) le->list.next;
} while (le != eti->listeners);
}
return DOM_NO_ERR;
}
/**
* Add an EventListener
*
* \param et The EventTarget object
* \param namespace The namespace of this listener
* \param type The event type which this event listener listens for
* \param listener The event listener object
* \param capture Whether add this listener in the capturing phase
* \return DOM_NO_ERR on success, appropriate dom_exception on failure.
*
* We don't support this API now, so it always return DOM_NOT_SUPPORTED_ERR.
*/
dom_exception _dom_event_target_add_event_listener_ns(
dom_event_target_internal *eti,
dom_string *namespace, dom_string *type,
struct dom_event_listener *listener, bool capture)
{
UNUSED(eti);
UNUSED(namespace);
UNUSED(type);
UNUSED(listener);
UNUSED(capture);
return DOM_NOT_SUPPORTED_ERR;
}
/**
* Remove an EventListener
*
* \param et The EventTarget object
* \param namespace The namespace of this listener
* \param type The event type which this event listener listens for
* \param listener The event listener object
* \param capture Whether add this listener in the capturing phase
* \return DOM_NO_ERR on success, appropriate dom_exception on failure.
*
* We don't support this API now, so it always return DOM_NOT_SUPPORTED_ERR.
*/
dom_exception _dom_event_target_remove_event_listener_ns(
dom_event_target_internal *eti,
dom_string *namespace, dom_string *type,
struct dom_event_listener *listener, bool capture)
{
UNUSED(eti);
UNUSED(namespace);
UNUSED(type);
UNUSED(listener);
UNUSED(capture);
return DOM_NOT_SUPPORTED_ERR;
}
/*-------------------------------------------------------------------------*/
/**
* Dispatch an event on certain EventTarget
*
* \param et The EventTarget object
* \param eti Internal EventTarget object
* \param evt The event object
* \param success Indicates whether any of the listeners which handled the
* event called Event.preventDefault(). If
* Event.preventDefault() was called the returned value is
* false, else it is true.
* \return DOM_NO_ERR on success, appropriate dom_exception on failure.
*/
dom_exception _dom_event_target_dispatch(dom_event_target *et,
dom_event_target_internal *eti,
struct dom_event *evt, dom_event_flow_phase phase,
bool *success)
{
if (eti->listeners != NULL) {
struct listener_entry *le = eti->listeners;
evt->current = et;
do {
if (dom_string_isequal(le->type, evt->type)) {
assert(le->listener->handler != NULL);
if ((le->capture &&
phase == DOM_CAPTURING_PHASE) ||
(le->capture == false &&
phase == DOM_BUBBLING_PHASE) ||
(evt->target == evt->current &&
phase == DOM_AT_TARGET)) {
le->listener->handler(evt,
le->listener->pw);
/* If the handler called
* stopImmediatePropagation, we should
* break */
if (evt->stop_now == true)
break;
}
}
le = (struct listener_entry *) le->list.next;
} while (le != eti->listeners);
}
if (evt->prevent_default == true)
*success = false;
return DOM_NO_ERR;
}
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