entityTypeManager = $entity_type_manager; } /** * {@inheritdoc} */ public function applies(RouteMatchInterface $route_match, ?CacheableMetadata $cacheable_metadata = NULL) { // @todo Remove null safe operator in Drupal 12.0.0, see // https://www.drupal.org/project/drupal/issues/3459277. $cacheable_metadata?->addCacheContexts(['route']); return $route_match->getRouteName() == 'comment.reply' && $route_match->getParameter('entity'); } /** * {@inheritdoc} */ public function build(RouteMatchInterface $route_match) { $breadcrumb = new Breadcrumb(); // @todo Remove in Drupal 12.0.0, will be added from ::applies(). See // https://www.drupal.org/project/drupal/issues/3459277 $breadcrumb->addCacheContexts(['route']); $breadcrumb->addLink(Link::createFromRoute($this->t('Home'), '')); $entity = $route_match->getParameter('entity'); $breadcrumb->addLink(new Link($entity->label(), $entity->toUrl())); $breadcrumb->addCacheableDependency($entity); if (($pid = $route_match->getParameter('pid')) && ($comment = $this->entityTypeManager->getStorage('comment')->load($pid))) { /** @var \Drupal\comment\CommentInterface $comment */ $breadcrumb->addCacheableDependency($comment); // Display link to parent comment. // @todo Clean-up permalink in https://www.drupal.org/node/2198041 $breadcrumb->addLink(new Link($comment->getSubject(), $comment->toUrl())); } return $breadcrumb; } }