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<?php |
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/** |
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* Webino™ (http://webino.sk) |
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* |
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* @link https://github.com/webino/event-emitter |
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* @copyright Copyright (c) 2019 Webino, s.r.o. (http://webino.sk) |
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* @author Peter Bačinský <[email protected]> |
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* @license BSD-3-Clause |
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*/ |
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namespace Webino; |
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/** |
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* Class EventHandlerTrait |
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* @package event-emitter |
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*/ |
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trait EventHandlerTrait |
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{ |
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/** |
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* @var EventDispatcherInterface |
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*/ |
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private $emitter; |
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/** |
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* @var callable[] |
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*/ |
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private $handlers = []; |
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/** |
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* Initialize events. |
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*/ |
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abstract protected function initEvents(): void; |
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/** |
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* Handle an event. |
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* |
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* @param string|EventInterface $event Event name or object |
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* @param string|callable|null $callback Event handler |
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* @param int $priority |
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* @return void |
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*/ |
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protected function on($event, $callback = null, $priority = 1): void |
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{ |
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$handler = $this->createCallback($callback); |
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$this->emitter->on($event, $handler, $priority); |
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$this->handlers[] = $handler; |
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} |
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/** |
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* Attach event emitter to handler. |
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* |
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* @api |
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* @param EventDispatcherInterface $emitter Event emitter |
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* @return void |
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*/ |
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public function attachEventEmitter(EventDispatcherInterface $emitter): void |
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{ |
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$this->emitter = $emitter; |
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$this->initEvents(); |
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} |
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/** |
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* Detach event emitter from handler. |
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* |
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* @api |
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* @param EventDispatcherInterface $emitter Event emitter |
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* @return void |
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*/ |
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public function detachEventEmitter(EventDispatcherInterface $emitter): void |
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{ |
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foreach ($this->handlers as $index => $handler) { |
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$emitter->off($handler); |
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unset($this->handlers[$index]); |
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} |
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} |
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/** |
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* @param string|callable|null $callback |
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* @return callable |
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*/ |
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private function createCallback($callback) |
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{ |
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$callback = is_string($callback) ? [$this, $callback] : $callback; |
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return is_callable($callback) ? $callback : function () { |
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}; |
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} |
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} |
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webino /
event-emitter
