ExamplePreprocessorEventSubscriber.php in Hook Event Dispatcher 8

Namespace

Drupal\hook_event_dispatcher\Example

File

src/Example/ExamplePreprocessorEventSubscriber.php

<?php

namespace Drupal\hook_event_dispatcher\Example;

use Drupal\hook_event_dispatcher\Event\Preprocess\BlockPreprocessEvent;
use Drupal\hook_event_dispatcher\Event\Preprocess\PagePreprocessEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Class ExamplePreprocessorEventSubscriber.
 */
final class ExamplePreprocessorEventSubscriber implements EventSubscriberInterface {

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    return [
      PagePreprocessEvent::name() => 'preprocessPage',
      BlockPreprocessEvent::name() => 'preprocessBlock',
    ];
  }

  /**
   * Preprocess a node page to set the node title as page title.
   *
   * @param \Drupal\hook_event_dispatcher\Event\Preprocess\PagePreprocessEvent $event
   *   Event.
   */
  public function preprocessPage(PagePreprocessEvent $event) {

    /** @var \Drupal\hook_event_dispatcher\Event\Preprocess\Variables\PageEventVariables $variables */
    $variables = $event
      ->getVariables();
    $node = $variables
      ->getNode();
    if ($node === NULL) {
      return;
    }
    $variables
      ->set('title', $node
      ->getTitle());
  }

  /**
   * Preprocess blocks with field_contact_form and add contact-form-wrapper id.
   *
   * @param \Drupal\hook_event_dispatcher\Event\Preprocess\BlockPreprocessEvent $event
   *   Event.
   */
  public function preprocessBlock(BlockPreprocessEvent $event) {

    /** @var \Drupal\hook_event_dispatcher\Event\Preprocess\Variables\BlockEventVariables $variables */
    $variables = $event
      ->getVariables();
    if ($variables
      ->get('field_contact_form') === NULL) {
      return;
    }
    $variables
      ->getByReference('attributes')['id'] = 'contact-form-wrapper';
  }

}

Classes

Name	Description
ExamplePreprocessorEventSubscriber	Class ExamplePreprocessorEventSubscriber.