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EventDispatcherInterface.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * file that was distributed with this source code.
10 */
11
12 namespace Symfony\Component\EventDispatcher;
13
14 /**
15 * The EventDispatcherInterface is the central point of Symfony's event listener system.
16 * Listeners are registered on the manager and events are dispatched through the
17 * manager.
18 *
19 * @author Bernhard Schussek <bschussek@gmail.com>
20 */
21 interface EventDispatcherInterface
22 {
23 /**
24 * Dispatches an event to all registered listeners.
25 *
26 * @param string $eventName The name of the event to dispatch. The name of
27 * the event is the name of the method that is
28 * invoked on listeners.
29 * @param Event|null $event The event to pass to the event handlers/listeners
30 * If not supplied, an empty Event instance is created
31 *
32 * @return Event
33 */
34 public function dispatch($eventName, Event $event = null);
35
36 /**
37 * Adds an event listener that listens on the specified events.
38 *
39 * @param string $eventName The event to listen on
40 * @param callable $listener The listener
41 * @param int $priority The higher this value, the earlier an event
42 * listener will be triggered in the chain (defaults to 0)
43 */
44 public function addListener($eventName, $listener, $priority = 0);
45
46 /**
47 * Adds an event subscriber.
48 *
49 * The subscriber is asked for all the events it is
50 * interested in and added as a listener for these events.
51 */
52 public function addSubscriber(EventSubscriberInterface $subscriber);
53
54 /**
55 * Removes an event listener from the specified events.
56 *
57 * @param string $eventName The event to remove a listener from
58 * @param callable $listener The listener to remove
59 */
60 public function removeListener($eventName, $listener);
61
62 public function removeSubscriber(EventSubscriberInterface $subscriber);
63
64 /**
65 * Gets the listeners of a specific event or all listeners sorted by descending priority.
66 *
67 * @param string|null $eventName The name of the event
68 *
69 * @return array The event listeners for the specified event, or all event listeners by event name
70 */
71 public function getListeners($eventName = null);
72
73 /**
74 * Gets the listener priority for a specific event.
75 *
76 * Returns null if the event or the listener does not exist.
77 *
78 * @param string $eventName The name of the event
79 * @param callable $listener The listener
80 *
81 * @return int|null The event listener priority
82 */
83 public function getListenerPriority($eventName, $listener);
84
85 /**
86 * Checks whether an event has any registered listeners.
87 *
88 * @param string|null $eventName The name of the event
89 *
90 * @return bool true if the specified event has any listeners, false otherwise
91 */
92 public function hasListeners($eventName = null);
93 }
94