Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\node;
Chris@0: 
Chris@0: use Drupal\Core\Entity\EntityInterface;
Chris@0: use Drupal\Core\Entity\EntityViewBuilder;
Chris@0: 
Chris@0: /**
Chris@0:  * View builder handler for nodes.
Chris@0:  */
Chris@0: class NodeViewBuilder extends EntityViewBuilder {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
Chris@0:     /** @var \Drupal\node\NodeInterface[] $entities */
Chris@0:     if (empty($entities)) {
Chris@0:       return;
Chris@0:     }
Chris@0: 
Chris@0:     parent::buildComponents($build, $entities, $displays, $view_mode);
Chris@0: 
Chris@0:     foreach ($entities as $id => $entity) {
Chris@0:       $bundle = $entity->bundle();
Chris@0:       $display = $displays[$bundle];
Chris@0: 
Chris@0:       if ($display->getComponent('links')) {
Chris@0:         $build[$id]['links'] = [
Chris@0:           '#lazy_builder' => [
Chris@0:             get_called_class() . '::renderLinks', [
Chris@0:               $entity->id(),
Chris@0:               $view_mode,
Chris@0:               $entity->language()->getId(),
Chris@0:               !empty($entity->in_preview),
Chris@14:               $entity->isDefaultRevision() ? NULL : $entity->getLoadedRevisionId(),
Chris@0:             ],
Chris@0:           ],
Chris@0:         ];
Chris@0:       }
Chris@0: 
Chris@0:       // Add Language field text element to node render array.
Chris@0:       if ($display->getComponent('langcode')) {
Chris@0:         $build[$id]['langcode'] = [
Chris@0:           '#type' => 'item',
Chris@0:           '#title' => t('Language'),
Chris@0:           '#markup' => $entity->language()->getName(),
Chris@0:           '#prefix' => '<div id="field-language-display">',
Chris@17:           '#suffix' => '</div>',
Chris@0:         ];
Chris@0:       }
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
Chris@0:     $defaults = parent::getBuildDefaults($entity, $view_mode);
Chris@0: 
Chris@0:     // Don't cache nodes that are in 'preview' mode.
Chris@0:     if (isset($defaults['#cache']) && isset($entity->in_preview)) {
Chris@0:       unset($defaults['#cache']);
Chris@0:     }
Chris@0: 
Chris@0:     return $defaults;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * #lazy_builder callback; builds a node's links.
Chris@0:    *
Chris@0:    * @param string $node_entity_id
Chris@0:    *   The node entity ID.
Chris@0:    * @param string $view_mode
Chris@0:    *   The view mode in which the node entity is being viewed.
Chris@0:    * @param string $langcode
Chris@0:    *   The language in which the node entity is being viewed.
Chris@0:    * @param bool $is_in_preview
Chris@0:    *   Whether the node is currently being previewed.
Chris@14:    * @param $revision_id
Chris@14:    *   (optional) The identifier of the node revision to be loaded. If none
Chris@14:    *   is provided, the default revision will be loaded.
Chris@0:    *
Chris@0:    * @return array
Chris@0:    *   A renderable array representing the node links.
Chris@0:    */
Chris@14:   public static function renderLinks($node_entity_id, $view_mode, $langcode, $is_in_preview, $revision_id = NULL) {
Chris@0:     $links = [
Chris@0:       '#theme' => 'links__node',
Chris@0:       '#pre_render' => ['drupal_pre_render_links'],
Chris@0:       '#attributes' => ['class' => ['links', 'inline']],
Chris@0:     ];
Chris@0: 
Chris@0:     if (!$is_in_preview) {
Chris@14:       $storage = \Drupal::entityTypeManager()->getStorage('node');
Chris@14:       /** @var \Drupal\node\NodeInterface $revision */
Chris@14:       $revision = !isset($revision_id) ? $storage->load($node_entity_id) : $storage->loadRevision($revision_id);
Chris@14:       $entity = $revision->getTranslation($langcode);
Chris@0:       $links['node'] = static::buildLinks($entity, $view_mode);
Chris@0: 
Chris@0:       // Allow other modules to alter the node links.
Chris@0:       $hook_context = [
Chris@0:         'view_mode' => $view_mode,
Chris@0:         'langcode' => $langcode,
Chris@0:       ];
Chris@0:       \Drupal::moduleHandler()->alter('node_links', $links, $entity, $hook_context);
Chris@0:     }
Chris@0:     return $links;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Build the default links (Read more) for a node.
Chris@0:    *
Chris@0:    * @param \Drupal\node\NodeInterface $entity
Chris@0:    *   The node object.
Chris@0:    * @param string $view_mode
Chris@0:    *   A view mode identifier.
Chris@0:    *
Chris@0:    * @return array
Chris@0:    *   An array that can be processed by drupal_pre_render_links().
Chris@0:    */
Chris@0:   protected static function buildLinks(NodeInterface $entity, $view_mode) {
Chris@0:     $links = [];
Chris@0: 
Chris@0:     // Always display a read more link on teasers because we have no way
Chris@0:     // to know when a teaser view is different than a full view.
Chris@0:     if ($view_mode == 'teaser') {
Chris@0:       $node_title_stripped = strip_tags($entity->label());
Chris@0:       $links['node-readmore'] = [
Chris@0:         'title' => t('Read more<span class="visually-hidden"> about @title</span>', [
Chris@0:           '@title' => $node_title_stripped,
Chris@0:         ]),
Chris@18:         'url' => $entity->toUrl(),
Chris@0:         'language' => $entity->language(),
Chris@0:         'attributes' => [
Chris@0:           'rel' => 'tag',
Chris@0:           'title' => $node_title_stripped,
Chris@0:         ],
Chris@0:       ];
Chris@0:     }
Chris@0: 
Chris@0:     return [
Chris@0:       '#theme' => 'links__node__node',
Chris@0:       '#links' => $links,
Chris@0:       '#attributes' => ['class' => ['links', 'inline']],
Chris@0:     ];
Chris@0:   }
Chris@0: 
Chris@0: }