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82 lines
2.7 KiB
82 lines
2.7 KiB
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\EventDispatcher;
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use Symfony\Contracts\EventDispatcher\EventDispatcherInterface as ContractsEventDispatcherInterface;
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/**
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* The EventDispatcherInterface is the central point of Symfony's event listener system.
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* Listeners are registered on the manager and events are dispatched through the
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* manager.
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*
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* @author Bernhard Schussek <bschussek@gmail.com>
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*/
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interface EventDispatcherInterface extends ContractsEventDispatcherInterface
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{
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/**
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* Adds an event listener that listens on the specified events.
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*
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* @param string $eventName The event to listen on
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* @param callable $listener The listener
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* @param int $priority The higher this value, the earlier an event
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* listener will be triggered in the chain (defaults to 0)
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*/
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public function addListener($eventName, $listener, $priority = 0);
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/**
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* Adds an event subscriber.
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*
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* The subscriber is asked for all the events it is
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* interested in and added as a listener for these events.
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*/
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public function addSubscriber(EventSubscriberInterface $subscriber);
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/**
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* Removes an event listener from the specified events.
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*
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* @param string $eventName The event to remove a listener from
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* @param callable $listener The listener to remove
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*/
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public function removeListener($eventName, $listener);
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public function removeSubscriber(EventSubscriberInterface $subscriber);
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/**
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* Gets the listeners of a specific event or all listeners sorted by descending priority.
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*
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* @param string|null $eventName The name of the event
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*
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* @return array The event listeners for the specified event, or all event listeners by event name
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*/
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public function getListeners($eventName = null);
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/**
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* Gets the listener priority for a specific event.
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*
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* Returns null if the event or the listener does not exist.
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*
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* @param string $eventName The name of the event
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* @param callable $listener The listener
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*
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* @return int|null The event listener priority
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*/
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public function getListenerPriority($eventName, $listener);
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/**
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* Checks whether an event has any registered listeners.
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*
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* @param string|null $eventName The name of the event
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*
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* @return bool true if the specified event has any listeners, false otherwise
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*/
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public function hasListeners($eventName = null);
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}
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