Webiny\Component\EventManager\EventManager::listen PHP Method

EventManager Class Documentation Usage Examples Of Webiny\Component\EventManager\EventManager::listen Datei anzeigen Open project: Webiny/Framework

listen() public method

Subscribe to event
public listen ( string $eventName, EventListener $eventListener = null ) : EventListener
$eventName string Event name you want to listen
$eventListener EventListener (Optional) If specified, given EventListener will be used for this event
return EventListener Return instance of EventListener 
    public function listen($eventName, EventListener $eventListener = null)
    {
        if (!$this->isString($eventName) || $this->str($eventName)->length() == 0) {
            throw new EventManagerException(EventManagerException::INVALID_EVENT_NAME);
        }
        if ($this->isNull($eventListener)) {
            $eventListener = new EventListener();
        }
        $eventListeners = $this->events->key($eventName, [], true);
        $eventListeners[] = $eventListener;
        $this->events->key($eventName, $eventListeners);
        return $eventListener;
    }

Usage Example

Beispiel #1
0
 /**
  * binds the listeners
  */
 public function bind()
 {
     $this->eventManager->listen(Compiler\Event\ExpressionBeforeCompile::EVENT_NAME)->handler(new ExpressionListener($this->bindOnExpressions))->method('beforeCompile');
     $this->eventManager->listen(Compiler\Event\StatementBeforeCompile::EVENT_NAME)->handler(new StatementListener($this->bindOnStatements))->method('beforeCompile');
     $this->eventManager->listen(Compiler\Event\ScalarBeforeCompile::EVENT_NAME)->handler(new ScalarListener($this->bindOnScalars))->method('beforeCompile');
 }
EventManager
disable
enable
fire
fireWildcardEvents
getEventListeners
init
listen
subscribe