1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\EventDispatcher;
/**
* The EventDispatcherInterface is the central point of Symfony's event listener system.
*
* Listeners are registered on the manager and events are dispatched through the
* manager.
*
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Jonathan Wage <jonwage@gmail.com>
* @author Roman Borschel <roman@code-factory.org>
* @author Bernhard Schussek <bschussek@gmail.com>
* @author Fabien Potencier <fabien@symfony.com>
* @author Jordi Boggiano <j.boggiano@seld.be>
* @author Jordan Alliot <jordan.alliot@gmail.com>
*/
class EventDispatcher implements EventDispatcherInterface
{
private $listeners = array();
private $sorted = array();
/**
* {@inheritdoc}
*/
public function dispatch($eventName, Event $event = null)
{
if (null === $event) {
$event = new Event();
}
$event->setDispatcher($this);
$event->setName($eventName);
if ($listeners = $this->getListeners($eventName)) {
$this->doDispatch($listeners, $eventName, $event);
}
return $event;
}
/**
* {@inheritdoc}
*/
public function getListeners($eventName = null)
{
if (null !== $eventName) {
if (!isset($this->listeners[$eventName])) {
return array();
}
if (!isset($this->sorted[$eventName])) {
$this->sortListeners($eventName);
}
return $this->sorted[$eventName];
}
foreach ($this->listeners as $eventName => $eventListeners) {
if (!isset($this->sorted[$eventName])) {
$this->sortListeners($eventName);
}
}
return array_filter($this->sorted);
}
/**
* {@inheritdoc}
*/
public function hasListeners($eventName = null)
{
return (bool) count($this->getListeners($eventName));
}
/**
* {@inheritdoc}
*/
public function addListener($eventName, $listener, $priority = 0)
{
$this->listeners[$eventName][$priority][] = $listener;
unset($this->sorted[$eventName]);
}
/**
* {@inheritdoc}
*/
public function removeListener($eventName, $listener)
{
if (!isset($this->listeners[$eventName])) {
return;
}
foreach ($this->listeners[$eventName] as $priority => $listeners) {
if (false !== ($key = array_search($listener, $listeners, true))) {
unset($this->listeners[$eventName][$priority][$key], $this->sorted[$eventName]);
}
}
}
/**
* {@inheritdoc}
*/
public function addSubscriber(EventSubscriberInterface $subscriber)
{
foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
if (is_string($params)) {
$this->addListener($eventName, array($subscriber, $params));
} elseif (is_string($params[0])) {
$this->addListener($eventName, array($subscriber, $params[0]), isset($params[1]) ? $params[1] : 0);
} else {
foreach ($params as $listener) {
$this->addListener($eventName, array($subscriber, $listener[0]), isset($listener[1]) ? $listener[1] : 0);
}
}
}
}
/**
* {@inheritdoc}
*/
public function removeSubscriber(EventSubscriberInterface $subscriber)
{
foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
if (is_array($params) && is_array($params[0])) {
foreach ($params as $listener) {
$this->removeListener($eventName, array($subscriber, $listener[0]));
}
} else {
$this->removeListener($eventName, array($subscriber, is_string($params) ? $params : $params[0]));
}
}
}
/**
* Triggers the listeners of an event.
*
* This method can be overridden to add functionality that is executed
* for each listener.
*
* @param callable[] $listeners The event listeners.
* @param string $eventName The name of the event to dispatch.
* @param Event $event The event object to pass to the event handlers/listeners.
*/
protected function doDispatch($listeners, $eventName, Event $event)
{
foreach ($listeners as $listener) {
if ($event->isPropagationStopped()) {
break;
}
call_user_func($listener, $event, $eventName, $this);
}
}
/**
* Sorts the internal list of listeners for the given event by priority.
*
* @param string $eventName The name of the event.
*/
private function sortListeners($eventName)
{
$this->sorted[$eventName] = array();
krsort($this->listeners[$eventName]);
$this->sorted[$eventName] = call_user_func_array('array_merge', $this->listeners[$eventName]);
}
}
|
