class NodePreviewController in Zircon Profile 8

Defines a controller to render a single node in preview.

Hierarchy

• class \Drupal\Core\Entity\Controller\EntityViewController implements ContainerInjectionInterface
  • class \Drupal\node\Controller\NodePreviewController

File

core/modules/node/src/Controller/NodePreviewController.php, line 16

Contains \Drupal\node\Controller\NodePreviewController.

Namespace

Drupal\node\Controller

class NodePreviewController extends EntityViewController {

  /**
   * {@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($build['#cache']);
    foreach ($node_preview
      ->uriRelationships() as $rel) {

      // Set the node path as the canonical URL to prevent duplicate content.
      $build['#attached']['html_head_link'][] = array(
        array(
          'rel' => $rel,
          'href' => $node_preview
            ->url($rel),
        ),
        TRUE,
      );
      if ($rel == 'canonical') {

        // Set the non-aliased canonical path as a default shortlink.
        $build['#attached']['html_head_link'][] = array(
          array(
            'rel' => 'shortlink',
            'href' => $node_preview
              ->url($rel, array(
              'alias' => TRUE,
            )),
          ),
          TRUE,
        );
      }
    }
    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 $this->entityManager
      ->getTranslationFromContext($node_preview)
      ->label();
  }

}

Members

Name	Modifiers	Type	Description	Overrides
EntityViewController::$entityManager	protected	property	The entity manager
EntityViewController::$renderer	protected	property	The renderer service.
EntityViewController::buildTitle	public	function	Pre-render callback to build the page title.
EntityViewController::create	public static	function	Instantiates a new instance of this class. Overrides ContainerInjectionInterface::create
EntityViewController::__construct	public	function	Creates an EntityViewController object.
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