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<?php |
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/** |
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* @author Alexey Samoylov <[email protected]> |
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*/ |
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namespace YarCode\Events; |
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trait EventEmitterTrait |
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{ |
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private $listeners = []; |
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/** |
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* @param string $eventName |
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* @param callable $listener |
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*/ |
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public function addListener($eventName, callable $listener) |
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{ |
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if (!isset($this->listeners[$eventName])) { |
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$this->listeners[$eventName] = []; |
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} |
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$this->listeners[$eventName][] = $listener; |
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} |
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/** |
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* @param string $eventName |
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* @param callable $listener |
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*/ |
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public function removeListener($eventName, callable $listener) |
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{ |
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if (isset($this->listeners[$eventName])) { |
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if (false !== $index = array_search($listener, $this->listeners[$eventName], true)) { |
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unset($this->listeners[$eventName][$index]); |
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} |
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} |
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} |
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/** |
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* @param string|null $eventName |
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*/ |
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public function removeAllListeners($eventName = null) |
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{ |
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if ($eventName !== null) { |
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unset($this->listeners[$eventName]); |
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} else { |
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$this->listeners = []; |
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} |
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} |
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/** |
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* @param string $eventName |
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* @param Event|mixed $eventData |
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*/ |
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public function emit($eventName, $eventData = null) |
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{ |
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if (empty($this->listeners($eventName))) { |
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return; |
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} |
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if ($eventData === null) { |
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$eventData = new Event(); |
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$eventData->name = $eventName; |
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$eventData->handled = false; |
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} |
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$this->runListeners($eventName, $eventData); |
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} |
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/** |
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* @param string $eventName |
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* @return array |
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*/ |
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public function listeners($eventName) |
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{ |
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return isset($this->listeners[$eventName]) ? $this->listeners[$eventName] : []; |
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} |
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/** |
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* @param string $eventName |
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* @param Event|mixed $eventData |
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*/ |
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private function runListeners($eventName, $eventData) |
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{ |
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foreach ($this->listeners($eventName) as $listener) { |
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call_user_func($listener, $eventData, $this); |
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if ($eventData instanceof Event) { |
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if ($eventData->handled) { |
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break; |
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} |
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} |
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} |
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} |
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} |
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yarcode /
simple-events
