class NodePreviewController in Drupal 8

Defines a controller to render a single node in preview.

Hierarchy

• class \Drupal\Core\Entity\Controller\EntityViewController implements ContainerInjectionInterface, TrustedCallbackInterface uses DeprecatedServicePropertyTrait
  • class \Drupal\node\Controller\NodePreviewController

File

core/modules/node/src/Controller/NodePreviewController.php, line 15

Namespace

Drupal\node\Controller

class NodePreviewController extends EntityViewController {

  /**
   * The entity repository service.
   *
   * @var \Drupal\Core\Entity\EntityRepositoryInterface
   */
  protected $entityRepository;

  /**
   * Creates an NodeViewController object.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   * @param \Drupal\Core\Render\RendererInterface $renderer
   *   The renderer service.
   * @param \Drupal\Core\Entity\EntityRepositoryInterface $entity_repository
   *   The entity repository.
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager, RendererInterface $renderer, EntityRepositoryInterface $entity_repository = NULL) {
    parent::__construct($entity_type_manager, $renderer);
    if (!$entity_repository) {
      @trigger_error('The entity.repository service must be passed to NodePreviewController::__construct(), it is required before Drupal 9.0.0. See https://www.drupal.org/node/2549139.', E_USER_DEPRECATED);
      $entity_repository = \Drupal::service('entity.repository');
    }
    $this->entityRepository = $entity_repository;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container
      ->get('entity_type.manager'), $container
      ->get('renderer'), $container
      ->get('entity.repository'));
  }

  /**
   * {@inheritdoc}
   */
  public function view(EntityInterface $node_preview, $view_mode_id = 'full', $langcode = NULL) {
    $node_preview->preview_view_mode = $view_mode_id;
    $build = parent::view($node_preview, $view_mode_id);
    $build['#attached']['library'][] = 'node/drupal.node.preview';

    // Don't render cache previews.
    unset($build['#cache']);
    return $build;
  }

  /**
   * The _title_callback for the page that renders a single node in preview.
   *
   * @param \Drupal\Core\Entity\EntityInterface $node_preview
   *   The current node.
   *
   * @return string
   *   The page title.
   */
  public function title(EntityInterface $node_preview) {
    return $this->entityRepository
      ->getTranslationFromContext($node_preview)
      ->label();
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DeprecatedServicePropertyTrait::__get	public	function	Allows to access deprecated/removed properties.
EntityViewController::$deprecatedProperties	protected	property
EntityViewController::$entityTypeManager	protected	property	The entity type manager.
EntityViewController::$renderer	protected	property	The renderer service.
EntityViewController::buildTitle	public	function	Pre-render callback to build the page title.
EntityViewController::trustedCallbacks	public static	function	Lists the trusted callbacks provided by the implementing class. Overrides TrustedCallbackInterface::trustedCallbacks
EntityViewController::viewRevision	public	function	Provides a page to render a single entity revision.
NodePreviewController::$entityRepository	protected	property	The entity repository service.
NodePreviewController::create	public static	function	Instantiates a new instance of this class. Overrides EntityViewController::create
NodePreviewController::title	public	function	The _title_callback for the page that renders a single node in preview.
NodePreviewController::view	public	function	Provides a page to render a single entity. Overrides EntityViewController::view
NodePreviewController::__construct	public	function	Creates an NodeViewController object. Overrides EntityViewController::__construct
TrustedCallbackInterface::THROW_EXCEPTION		constant	Untrusted callbacks throw exceptions.
TrustedCallbackInterface::TRIGGER_SILENCED_DEPRECATION		constant	Untrusted callbacks trigger silenced E_USER_DEPRECATION errors.
TrustedCallbackInterface::TRIGGER_WARNING		constant	Untrusted callbacks trigger E_USER_WARNING errors.