ZF2 listener to set ViewModel's terminal property if request is XHR

XhrTerminalViewModelListener.php

<?php
/**
 * Attach XhrTerminalViewModelListener in module's onBootstrap() method.
 *
 * <code>
 * public function onBootstrap(MvcEvent $e)
 * {
 *     $app = $e->getApplication();
 *     $eventManager = $app->getEventManager();
 *     $eventManager->attach(new XhrTerminalViewModelListener());
 *   
 *     /* [...] */
 * }
 * </code>
 */

namespace Application\Listener;

use Zend\EventManager\EventManagerInterface;
use Zend\EventManager\ListenerAggregateInterface;
use Zend\Mvc\MvcEvent;
use Zend\View\Model\ViewModel;

class XhrTerminalViewModelListener implements ListenerAggregateInterface
{

    protected $listeners = array();

    /**
     * @inheritdoc
     */
    public function attach(EventManagerInterface $events)
    {
        $sharedEvents = $events->getSharedManager();
        /** @noinspection PhpVoidFunctionResultUsedInspection */
        $this->listeners[] = $sharedEvents->attach(
            'Zend\Mvc\Controller\AbstractController',
            'dispatch',
            array($this, 'setXhrTerminal'),
            -99
        );
    }

    /**
     * @inheritdoc
     */
    public function detach(EventManagerInterface $events)
    {
        foreach ($this->listeners as $index => $listener) {
            if ($events->detach($listener)) {
                unset($this->listeners[$index]);
            }
        }
    }

    /**
     * Set ViewModel 'terminate' property to true if request is XHR.
     * @param MvcEvent $e
     */
    public function setXhrTerminal($e)
    {
        $result = $e->getResult();
        $request = $e->getApplication()->getRequest();
        if ($result instanceof ViewModel) {
            $result->setTerminal($request->isXmlHttpRequest());
        }
    }
}