hook_event_dispatcher-8.x-2.04/examples/ExampleEntityEventSubscribers.php

<?php

namespace Drupal\hook_event_dispatcher;

use Drupal\Core\Entity\FieldableEntityInterface;
use Drupal\core_event_dispatcher\EntityHookEvents;
use Drupal\core_event_dispatcher\Event\Entity\EntityDeleteEvent;
use Drupal\core_event_dispatcher\Event\Entity\EntityInsertEvent;
use Drupal\core_event_dispatcher\Event\Entity\EntityPredeleteEvent;
use Drupal\core_event_dispatcher\Event\Entity\EntityPresaveEvent;
use Drupal\core_event_dispatcher\Event\Entity\EntityUpdateEvent;
use Drupal\core_event_dispatcher\Event\Entity\EntityViewEvent;
use Drupal\node\NodeInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Class ExampleEntityEventSubscribers.
 *
 * Don't forget to define your class as a service and tag it as
 * an "event_subscriber":
 *
 * services:
 *  hook_event_dispatcher.example_entity_subscribers:
 *   class: Drupal\hook_event_dispatcher\ExampleEntityEventSubscribers
 *   tags:
 *     - { name: event_subscriber }
 */
class ExampleEntityEventSubscribers implements EventSubscriberInterface {

  /**
   * Alter entity view.
   *
   * @param \Drupal\core_event_dispatcher\Event\Entity\EntityViewEvent $event
   *   The event.
   */
  public function alterEntityView(EntityViewEvent $event): void {
    $entity = $event->getEntity();

    // Only do this for entities of type Node.
    if ($entity instanceof NodeInterface) {
      $build = &$event->getBuild();
      $build['extra_markup'] = [
        '#markup' => 'this is extra markup',
      ];
    }
  }

  /**
   * Entity pre save.
   *
   * @param \Drupal\core_event_dispatcher\Event\Entity\EntityPresaveEvent $event
   *   The event.
   */
  public function entityPreSave(EntityPresaveEvent $event): void {
    $entity = $event->getEntity();
    if ($entity instanceof FieldableEntityInterface) {
      $entity->set('special_field', 'PreSave!');
    }
  }

  /**
   * Entity insert.
   *
   * @param \Drupal\core_event_dispatcher\Event\Entity\EntityInsertEvent $event
   *   The event.
   */
  public function entityInsert(EntityInsertEvent $event): void {
    // Do some fancy stuff with new entity.
    $entity = $event->getEntity();
    if ($entity instanceof FieldableEntityInterface) {
      $entity->set('special_field', 'Insert!');
    }
  }

  /**
   * Entity update.
   *
   * @param \Drupal\core_event_dispatcher\Event\Entity\EntityUpdateEvent $event
   *   The event.
   */
  public function entityUpdate(EntityUpdateEvent $event): void {
    // Do some fancy stuff, when entity is updated.
    $entity = $event->getEntity();
    if ($entity instanceof FieldableEntityInterface) {
      $entity->set('special_field', 'Update!');
    }
  }

  /**
   * Entity pre delete.
   *
   * @param \Drupal\core_event_dispatcher\Event\Entity\EntityPredeleteEvent $event
   *   The event.
   */
  public function entityPreDelete(EntityPredeleteEvent $event): void {
    // Do something before entity is deleted.
    $entity = $event->getEntity();
    if ($entity instanceof FieldableEntityInterface) {
      $entity->set('special_field', 'PreDelete!');
    }
  }

  /**
   * Entity delete.
   *
   * @param \Drupal\core_event_dispatcher\Event\Entity\EntityDeleteEvent $event
   *   The event.
   */
  public function entityDelete(EntityDeleteEvent $event): void {
    // Do some fancy stuff, after entity is deleted.
    $entity = $event->getEntity();
    if ($entity instanceof FieldableEntityInterface) {
      $entity->set('special_field', 'Deleted!');
    }
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents(): array {
    return [
      EntityHookEvents::ENTITY_VIEW => 'alterEntityView',
      EntityHookEvents::ENTITY_PRE_SAVE => 'entityPreSave',
      EntityHookEvents::ENTITY_INSERT => 'entityInsert',
      EntityHookEvents::ENTITY_UPDATE => 'entityUpdate',
      EntityHookEvents::ENTITY_PRE_DELETE => 'entityPreDelete',
      EntityHookEvents::ENTITY_DELETE => 'entityDelete',
    ];
  }

}