69 lines
1.6 KiB
PHP
69 lines
1.6 KiB
PHP
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<?php
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/*
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* This file is part of Evenement.
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*
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* (c) Igor Wiedler <igor@wiedler.ch>
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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 Evenement;
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trait EventEmitterTrait
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{
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protected $listeners = [];
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public function on($event, callable $listener)
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{
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if (!isset($this->listeners[$event])) {
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$this->listeners[$event] = [];
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}
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$this->listeners[$event][] = $listener;
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}
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public function once($event, callable $listener)
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{
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$onceListener = function () use (&$onceListener, $event, $listener) {
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$this->removeListener($event, $onceListener);
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call_user_func_array($listener, func_get_args());
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};
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$this->on($event, $onceListener);
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}
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public function removeListener($event, callable $listener)
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{
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if (isset($this->listeners[$event])) {
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$index = array_search($listener, $this->listeners[$event], true);
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if (false !== $index) {
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unset($this->listeners[$event][$index]);
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}
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}
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}
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public function removeAllListeners($event = null)
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{
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if ($event !== null) {
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unset($this->listeners[$event]);
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} else {
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$this->listeners = [];
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}
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}
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public function listeners($event)
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{
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return isset($this->listeners[$event]) ? $this->listeners[$event] : [];
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}
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public function emit($event, array $arguments = [])
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{
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foreach ($this->listeners($event) as $listener) {
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call_user_func_array($listener, $arguments);
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}
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}
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}
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