PHP RendererInterface::addCacheableDependency方法代码示例

 /**
  * {@inheritdoc}
  */
 public function buildForm(array $form, FormStateInterface $form_state, CartInterface $cart = NULL)
 {
     $form['#attached']['library'][] = 'uc_cart/uc_cart.styles';
     $cart_config = $this->config('uc_cart.settings');
     $form['items'] = array('#type' => 'table', '#tree' => TRUE, '#header' => array('remove' => array('data' => $this->t('Remove'), 'class' => array('remove')), 'image' => array('data' => $this->t('Products'), 'class' => array('image')), 'desc' => array('data' => '', 'class' => array('desc')), 'qty' => array('data' => $this->t('Quantity'), 'class' => array('qty')), 'total' => array('data' => $this->t('Total'), 'class' => array('price'))));
     $form['data'] = array('#tree' => TRUE, '#parents' => array('items'));
     $i = 0;
     $subtotal = 0;
     foreach ($cart->getContents() as $cart_item) {
         $item = \Drupal::moduleHandler()->invoke($cart_item->data->module, 'uc_cart_display', array($cart_item));
         if (Element::children($item)) {
             $form['items'][$i]['remove'] = $item['remove'];
             $form['items'][$i]['remove']['#name'] = 'remove-' . $i;
             $form['items'][$i]['image'] = uc_product_get_picture($item['nid']['#value'], 'uc_cart');
             $form['items'][$i]['desc']['title'] = $item['title'];
             $form['items'][$i]['desc']['description'] = $item['description'];
             $form['items'][$i]['qty'] = $item['qty'];
             $form['items'][$i]['total'] = array('#theme' => 'uc_price', '#price' => $item['#total'], '#wrapper_attributes' => array('class' => 'total'));
             if (!empty($item['#suffixes'])) {
                 $form['items'][$i]['total']['#suffixes'] = $item['#suffixes'];
             }
             $form['data'][$i]['module'] = $item['module'];
             $form['data'][$i]['nid'] = $item['nid'];
             $form['data'][$i]['data'] = $item['data'];
             $form['data'][$i]['title'] = array('#type' => 'value', '#value' => $item['title']['#markup']);
             $subtotal += $item['#total'];
         }
         $i++;
     }
     $form['items'][]['total'] = array('#theme' => 'uc_price', '#prefix' => '<span id="subtotal-title">' . $this->t('Subtotal') . ':</span> ', '#price' => $subtotal, '#wrapper_attributes' => array('colspan' => 5, 'class' => array('subtotal')));
     $form['actions'] = array('#type' => 'actions');
     // If the continue shopping element is enabled...
     if (($cs_type = $cart_config->get('continue_shopping_type')) !== 'none') {
         // Add the element to the form based on the element type.
         if ($cart_config->get('continue_shopping_type') == 'link') {
             $form['actions']['continue_shopping'] = array('#markup' => $this->l($this->t('Continue shopping'), Url::fromUri('internal:' . $this->continueShoppingUrl())));
         } elseif ($cart_config->get('continue_shopping_type') == 'button') {
             $form['actions']['continue_shopping'] = array('#type' => 'submit', '#value' => $this->t('Continue shopping'), '#submit' => array(array($this, 'submitForm'), array($this, 'continueShopping')));
         }
     }
     // Add the empty cart button if enabled.
     if ($cart_config->get('empty_button')) {
         $form['actions']['empty'] = array('#type' => 'submit', '#value' => $this->t('Empty cart'), '#submit' => array(array($this, 'emptyCart')));
     }
     // Add the control buttons for updating and proceeding to checkout.
     $form['actions']['update'] = array('#type' => 'submit', '#name' => 'update-cart', '#value' => $this->t('Update cart'), '#submit' => array(array($this, 'submitForm'), array($this, 'displayUpdateMessage')));
     $form['actions']['checkout'] = array('#theme' => 'uc_cart_checkout_buttons');
     if ($cart_config->get('checkout_enabled')) {
         $form['actions']['checkout']['checkout'] = array('#type' => 'submit', '#value' => $this->t('Checkout'), '#button_type' => 'primary', '#submit' => array(array($this, 'submitForm'), array($this, 'checkout')));
     }
     $this->renderer->addCacheableDependency($form, $cart);
     $this->renderer->addCacheableDependency($form, $cart_config);
     return $form;
 }

 /**
  * Displays add links for the available bundles.
  *
  * Redirects to the add form if there's only one bundle available.
  *
  * @param string $entity_type_id
  *   The entity type ID.
  * @param \Symfony\Component\HttpFoundation\Request $request
  *   The request.
  *
  * @return \Symfony\Component\HttpFoundation\RedirectResponse|array
  *   If there's only one available bundle, a redirect response.
  *   Otherwise, a render array with the add links for each bundle.
  */
 public function addPage($entity_type_id, Request $request)
 {
     $entity_type = $this->entityTypeManager()->getDefinition($entity_type_id);
     $bundle_type = $entity_type->getBundleEntityType();
     $bundle_key = $entity_type->getKey('bundle');
     $form_route_name = 'entity.' . $entity_type_id . '.add_form';
     $build = ['#theme' => 'entity_add_list', '#cache' => ['tags' => $entity_type->getListCacheTags()], '#bundle_type' => $bundle_type];
     $bundles = $this->entityTypeBundleInfo->getBundleInfo($entity_type_id);
     // Filter out the bundles the user doesn't have access to.
     $access_control_handler = $this->entityTypeManager()->getAccessControlHandler($bundle_type);
     foreach ($bundles as $bundle_name => $bundle_info) {
         $access = $access_control_handler->createAccess($bundle_name, NULL, [], TRUE);
         if (!$access->isAllowed()) {
             unset($bundles[$bundle_name]);
         }
         $this->renderer->addCacheableDependency($build, $access);
     }
     // Redirect if there's only one bundle available.
     if (count($bundles) == 1) {
         $bundle_names = array_keys($bundles);
         $bundle_name = reset($bundle_names);
         return $this->redirect($form_route_name, [$bundle_key => $bundle_name]);
     }
     // Prepare the #bundles array for the template.
     $bundles = $this->loadBundleDescriptions($bundles, $bundle_type);
     foreach ($bundles as $bundle_name => $bundle_info) {
         $build['#bundles'][$bundle_name] = ['label' => $bundle_info['label'], 'description' => $bundle_info['description'], 'add_link' => Link::createFromRoute($bundle_info['label'], $form_route_name, [$bundle_key => $bundle_name])];
     }
     return $build;
 }

  /**
   * {@inheritdoc}
   */
  public function view(EntityInterface $entity, $view_mode = 'full', $langcode = NULL) {
    if ($entity->status()) {
      $message = $this->contactMessageStorage->create([
        'contact_form' => $entity->id(),
      ]);

      $form = $this->entityFormBuilder->getForm($message);
      $form['#title'] = $entity->label();
      $form['#cache']['contexts'][] = 'user.permissions';

      $this->renderer->addCacheableDependency($form, $this->config);
    }
    else {
      // Form disabled, display a custom message using a template.
      $form['disabled_form_error'] = array(
        '#theme' => 'contact_storage_disabled_form',
        '#contact_form' => $entity,
        '#redirect_uri' => $entity->getThirdPartySetting('contact_storage', 'redirect_uri', ''),
        '#disabled_form_message' => $entity->getThirdPartySetting('contact_storage', 'disabled_form_message', t('This contact form has been disabled.')),
      );
    }
    // Add required cacheability metadata from the contact form entity, so that
    // changing it invalidates the cache.
    $this->renderer->addCacheableDependency($form, $entity);
    return $form;
  }

 /**
  * {@inheritdoc}
  */
 public function viewElements(FieldItemListInterface $items, $langcode)
 {
     $elements = [];
     $media = $this->getEntitiesToView($items, $langcode);
     // Early opt-out if the field is empty.
     if (empty($media)) {
         return $elements;
     }
     $url = NULL;
     $image_link_setting = $this->getSetting('image_link');
     // Check if the formatter involves a link.
     if ($image_link_setting == 'content') {
         $entity = $items->getEntity();
         if (!$entity->isNew()) {
             $url = $entity->urlInfo();
         }
     } elseif ($image_link_setting == 'media') {
         $link_media = TRUE;
     }
     $image_style_setting = $this->getSetting('image_style');
     foreach ($media as $delta => $media_item) {
         if (isset($link_media)) {
             $url = $media_item->url();
         }
         $elements[$delta] = ['#theme' => 'image_formatter', '#item' => $media_item->get('thumbnail'), '#item_attributes' => [], '#image_style' => $image_style_setting, '#url' => $url];
         // Collect cache tags to be added for each item in the field.
         $this->renderer->addCacheableDependency($elements[$delta], $media_item);
     }
     // Collect cache tags related to the image style setting.
     $image_style = $this->imageStyleStorage->load($image_style_setting);
     $this->renderer->addCacheableDependency($elements, $image_style);
     return $elements;
 }

 /**
  * {@inheritdoc}
  */
 public function buildForm(array $form, FormStateInterface $form_state, $args = array())
 {
     /* @var $search_api_page \Drupal\search_api_page\SearchApiPageInterface */
     $search_api_page = SearchApiPage::load($args['search_api_page']);
     $route = 'search_api_page.' . $this->languageManager->getCurrentLanguage()->getId() . '.' . $search_api_page->id();
     $form['#action'] = $this->getUrlGenerator()->generateFromRoute($route);
     $form['search_api_page'] = array('#type' => 'value', '#value' => $search_api_page->id());
     $form['keys'] = array('#type' => 'search', '#title' => $this->t('Search'), '#title_display' => 'invisible', '#size' => 15, '#default_value' => isset($args['keys']) ? $args['keys'] : '', '#attributes' => array('title' => $this->t('Enter the terms you wish to search for.')));
     $form['actions'] = array('#type' => 'actions');
     $form['actions']['submit'] = array('#type' => 'submit', '#value' => $this->t('Search'));
     if (!$search_api_page->getCleanUrl()) {
         $form['#method'] = 'get';
         $form['actions']['submit']['#name'] = '';
     }
     // Dependency on search api config entity.
     $this->renderer->addCacheableDependency($form, $search_api_page->getConfigDependencyName());
     return $form;
 }

 /**
  * {@inheritdoc}
  */
 public function buildForm(array $form, FormStateInterface $form_state)
 {
     // Set up the form to submit using GET to the correct search page.
     $entity_id = $this->searchPageRepository->getDefaultSearchPage();
     if (!$entity_id) {
         $form['message'] = array('#markup' => $this->t('Search is currently disabled'));
         return $form;
     }
     $route = 'search.view_' . $entity_id;
     $form['#action'] = $this->url($route);
     $form['#method'] = 'get';
     $form['keys'] = array('#type' => 'search', '#title' => $this->t('Search'), '#title_display' => 'invisible', '#size' => 15, '#default_value' => '', '#attributes' => array('title' => $this->t('Enter the terms you wish to search for.')));
     $form['actions'] = array('#type' => 'actions');
     $form['actions']['submit'] = array('#type' => 'submit', '#value' => $this->t('Search'), '#name' => '');
     // SearchPageRepository::getDefaultSearchPage() depends on search.settings.
     $this->renderer->addCacheableDependency($form, $this->configFactory->get('search.settings'));
     return $form;
 }

 /**
  * {@inheritdoc}
  */
 public function view(EntityInterface $entity, $view_mode = 'full', $langcode = NULL)
 {
     $message = $this->contactMessageStorage->create(['contact_form' => $entity->id()]);
     $form = $this->entityFormBuilder->getForm($message);
     $form['#title'] = $entity->label();
     $form['#cache']['contexts'][] = 'user.permissions';
     $this->renderer->addCacheableDependency($form, $this->config);
     return $form;
 }

 /**
  * Generates an overview table of older revisions of a node.
  *
  * @param \Drupal\node\NodeInterface $node
  *   A node object.
  *
  * @return array
  *   An array as expected by drupal_render().
  */
 public function revisionOverview(NodeInterface $node)
 {
     $account = $this->currentUser();
     $langcode = $node->language()->getId();
     $langname = $node->language()->getName();
     $languages = $node->getTranslationLanguages();
     $has_translations = count($languages) > 1;
     $node_storage = $this->entityManager()->getStorage('node');
     $type = $node->getType();
     $build['#title'] = $has_translations ? $this->t('@langname revisions for %title', ['@langname' => $langname, '%title' => $node->label()]) : $this->t('Revisions for %title', ['%title' => $node->label()]);
     $header = array($this->t('Revision'), $this->t('Operations'));
     $revert_permission = ($account->hasPermission("revert {$type} revisions") || $account->hasPermission('revert all revisions') || $account->hasPermission('administer nodes')) && $node->access('update');
     $delete_permission = ($account->hasPermission("delete {$type} revisions") || $account->hasPermission('delete all revisions') || $account->hasPermission('administer nodes')) && $node->access('delete');
     $rows = array();
     $vids = $node_storage->revisionIds($node);
     $latest_revision = TRUE;
     foreach (array_reverse($vids) as $vid) {
         /** @var \Drupal\node\NodeInterface $revision */
         $revision = $node_storage->loadRevision($vid);
         // Only show revisions that are affected by the language that is being
         // displayed.
         if ($revision->hasTranslation($langcode) && $revision->getTranslation($langcode)->isRevisionTranslationAffected()) {
             $username = ['#theme' => 'username', '#account' => $revision->getRevisionAuthor()];
             // Use revision link to link to revisions that are not active.
             $date = $this->dateFormatter->format($revision->revision_timestamp->value, 'short');
             if ($vid != $node->getRevisionId()) {
                 $link = $this->l($date, new Url('entity.node.revision', ['node' => $node->id(), 'node_revision' => $vid]));
             } else {
                 $link = $node->link($date);
             }
             $row = [];
             $column = ['data' => ['#type' => 'inline_template', '#template' => '{% trans %}{{ date }} by {{ username }}{% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}', '#context' => ['date' => $link, 'username' => $this->renderer->renderPlain($username), 'message' => ['#markup' => $revision->revision_log->value, '#allowed_tags' => Xss::getHtmlTagList()]]]];
             // @todo Simplify once https://www.drupal.org/node/2334319 lands.
             $this->renderer->addCacheableDependency($column['data'], $username);
             $row[] = $column;
             if ($latest_revision) {
                 $row[] = ['data' => ['#prefix' => '<em>', '#markup' => $this->t('Current revision'), '#suffix' => '</em>']];
                 foreach ($row as &$current) {
                     $current['class'] = ['revision-current'];
                 }
                 $latest_revision = FALSE;
             } else {
                 $links = [];
                 if ($revert_permission) {
                     $links['revert'] = ['title' => $this->t('Revert'), 'url' => $has_translations ? Url::fromRoute('node.revision_revert_translation_confirm', ['node' => $node->id(), 'node_revision' => $vid, 'langcode' => $langcode]) : Url::fromRoute('node.revision_revert_confirm', ['node' => $node->id(), 'node_revision' => $vid])];
                 }
                 if ($delete_permission) {
                     $links['delete'] = ['title' => $this->t('Delete'), 'url' => Url::fromRoute('node.revision_delete_confirm', ['node' => $node->id(), 'node_revision' => $vid])];
                 }
                 $row[] = ['data' => ['#type' => 'operations', '#links' => $links]];
             }
             $rows[] = $row;
         }
     }
     $build['node_revisions_table'] = array('#theme' => 'table', '#rows' => $rows, '#header' => $header, '#attached' => array('library' => array('node/drupal.node.admin')));
     return $build;
 }

 /**
  * Returns a renderable forum index page array.
  *
  * @param array $forums
  *   A list of forums.
  * @param \Drupal\taxonomy\TermInterface $term
  *   The taxonomy term of the forum.
  * @param array $topics
  *   The topics of this forum.
  * @param array $parents
  *   The parent forums in relation this forum.
  * @param array $header
  *   Array of header cells.
  *
  * @return array
  *   A render array.
  */
 protected function build($forums, TermInterface $term, $topics = array(), $parents = array(), $header = array())
 {
     $config = $this->config('forum.settings');
     $build = array('#theme' => 'forums', '#forums' => $forums, '#topics' => $topics, '#parents' => $parents, '#header' => $header, '#term' => $term, '#sortby' => $config->get('topics.order'), '#forums_per_page' => $config->get('topics.page_limit'));
     $build['#attached']['library'][] = 'forum/forum.index';
     if (empty($term->forum_container->value)) {
         $build['#attached']['feed'][] = array('taxonomy/term/' . $term->id() . '/feed', 'RSS - ' . $term->getName());
     }
     $this->renderer->addCacheableDependency($build, $config);
     return ['action' => $this->buildActionLinks($config->get('vocabulary'), $term), 'forum' => $build];
 }

 /**
  * Presents the site-wide contact form.
  *
  * @param \Drupal\contact\ContactFormInterface $contact_form
  *   The contact form to use.
  *
  * @return array
  *   The form as render array as expected by drupal_render().
  *
  * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
  *   Exception is thrown when user tries to access non existing default
  *   contact form.
  */
 public function contactSitePage(ContactFormInterface $contact_form = NULL)
 {
     $config = $this->config('contact.settings');
     // Use the default form if no form has been passed.
     if (empty($contact_form)) {
         $contact_form = $this->entityManager()->getStorage('contact_form')->load($config->get('default_form'));
         // If there are no forms, do not display the form.
         if (empty($contact_form)) {
             if ($this->currentUser()->hasPermission('administer contact forms')) {
                 drupal_set_message($this->t('The contact form has not been configured. <a href="@add">Add one or more forms</a> .', array('@add' => $this->url('contact.form_add'))), 'error');
                 return array();
             } else {
                 throw new NotFoundHttpException();
             }
         }
     }
     $message = $this->entityManager()->getStorage('contact_message')->create(array('contact_form' => $contact_form->id()));
     $form = $this->entityFormBuilder()->getForm($message);
     $form['#title'] = SafeMarkup::checkPlain($contact_form->label());
     $form['#cache']['contexts'][] = 'user.permissions';
     $this->renderer->addCacheableDependency($form, $config);
     return $form;
 }

 /**
  * {@inheritdoc}
  */
 public function buildForm(array $form, FormStateInterface $form_state)
 {
     $config = $this->config('system.site');
     // Display login form:
     $form['name'] = array('#type' => 'textfield', '#title' => $this->t('Username'), '#size' => 60, '#maxlength' => USERNAME_MAX_LENGTH, '#description' => $this->t('Enter your @s username.', array('@s' => $config->get('name'))), '#required' => TRUE, '#attributes' => array('autocorrect' => 'none', 'autocapitalize' => 'none', 'spellcheck' => 'false', 'autofocus' => 'autofocus'));
     $form['pass'] = array('#type' => 'password', '#title' => $this->t('Password'), '#size' => 60, '#description' => $this->t('Enter the password that accompanies your username.'), '#required' => TRUE);
     $form['actions'] = array('#type' => 'actions');
     $form['actions']['submit'] = array('#type' => 'submit', '#value' => $this->t('Log in'));
     $form['#validate'][] = '::validateName';
     $form['#validate'][] = '::validateAuthentication';
     $form['#validate'][] = '::validateFinal';
     $this->renderer->addCacheableDependency($form, $config);
     return $form;
 }

 /**
  * Shows permission-dependent content.
  *
  * @return array
  *   A render array.
  */
 public function permissionDependentContent()
 {
     $build = [];
     // The content depends on the access result.
     $access = AccessResult::allowedIfHasPermission($this->currentUser, 'pet llamas');
     $this->renderer->addCacheableDependency($build, $access);
     // Build the content.
     if ($access->isAllowed()) {
         $build['allowed'] = ['#markup' => 'Permission to pet llamas: yes!'];
     } else {
         $build['forbidden'] = ['#markup' => 'Permission to pet llamas: no!'];
     }
     return $build;
 }

 /**
  * Creates a render array for the search page.
  *
  * @param \Symfony\Component\HttpFoundation\Request $request
  *   The request object.
  * @param \Drupal\search\SearchPageInterface $entity
  *   The search page entity.
  *
  * @return array
  *   The search form and search results build array.
  */
 public function view(Request $request, SearchPageInterface $entity)
 {
     $build = array();
     $plugin = $entity->getPlugin();
     // Build the form first, because it may redirect during the submit,
     // and we don't want to build the results based on last time's request.
     $build['#cache']['contexts'][] = 'url.query_args:keys';
     if ($request->query->has('keys')) {
         $keys = trim($request->query->get('keys'));
         $plugin->setSearch($keys, $request->query->all(), $request->attributes->all());
     }
     $build['#title'] = $plugin->suggestedTitle();
     $build['search_form'] = $this->entityFormBuilder()->getForm($entity, 'search');
     // Build search results, if keywords or other search parameters are in the
     // GET parameters. Note that we need to try the search if 'keys' is in
     // there at all, vs. being empty, due to advanced search.
     $results = array();
     if ($request->query->has('keys')) {
         if ($plugin->isSearchExecutable()) {
             // Log the search.
             if ($this->config('search.settings')->get('logging')) {
                 $this->logger->notice('Searched %type for %keys.', array('%keys' => $keys, '%type' => $entity->label()));
             }
             // Collect the search results.
             $results = $plugin->buildResults();
         } else {
             // The search not being executable means that no keywords or other
             // conditions were entered.
             drupal_set_message($this->t('Please enter some keywords.'), 'error');
         }
     }
     if (count($results)) {
         $build['search_results_title'] = array('#markup' => '<h2>' . $this->t('Search results') . '</h2>');
     }
     $build['search_results'] = array('#theme' => array('item_list__search_results__' . $plugin->getPluginId(), 'item_list__search_results'), '#items' => $results, '#empty' => array('#markup' => '<h3>' . $this->t('Your search yielded no results.') . '</h3>'), '#list_type' => 'ol', '#context' => array('plugin' => $plugin->getPluginId()));
     $this->renderer->addCacheableDependency($build, $entity);
     if ($plugin instanceof CacheableDependencyInterface) {
         $this->renderer->addCacheableDependency($build, $plugin);
     }
     // If this plugin uses a search index, then also add the cache tag tracking
     // that search index, so that cached search result pages are invalidated
     // when necessary.
     if ($plugin->getType()) {
         $build['search_results']['#cache']['tags'][] = 'search_index';
         $build['search_results']['#cache']['tags'][] = 'search_index:' . $plugin->getType();
     }
     $build['pager'] = array('#type' => 'pager');
     return $build;
 }

 /**
  * Generates an overview table of older revisions of a node.
  *
  * @param \Drupal\node\NodeInterface $node
  *   A node object.
  *
  * @return array
  *   An array as expected by drupal_render().
  */
 public function revisionOverview(NodeInterface $node)
 {
     $account = $this->currentUser();
     $node_storage = $this->entityManager()->getStorage('node');
     $type = $node->getType();
     $build = array();
     $build['#title'] = $this->t('Revisions for %title', array('%title' => $node->label()));
     $header = array($this->t('Revision'), $this->t('Operations'));
     $revert_permission = ($account->hasPermission("revert {$type} revisions") || $account->hasPermission('revert all revisions') || $account->hasPermission('administer nodes')) && $node->access('update');
     $delete_permission = ($account->hasPermission("delete {$type} revisions") || $account->hasPermission('delete all revisions') || $account->hasPermission('administer nodes')) && $node->access('delete');
     $rows = array();
     $vids = $node_storage->revisionIds($node);
     foreach (array_reverse($vids) as $vid) {
         $revision = $node_storage->loadRevision($vid);
         $username = ['#theme' => 'username', '#account' => $revision->uid->entity];
         // Use revision link to link to revisions that are not active.
         $date = $this->dateFormatter->format($revision->revision_timestamp->value, 'short');
         if ($vid != $node->getRevisionId()) {
             $link = $this->l($date, new Url('entity.node.revision', ['node' => $node->id(), 'node_revision' => $vid]));
         } else {
             $link = $node->link($date);
         }
         $row = [];
         $column = ['data' => ['#type' => 'inline_template', '#template' => '{% trans %}{{ date }} by {{ username }}{% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}', '#context' => ['date' => $link, 'username' => $this->renderer->renderPlain($username), 'message' => Xss::filter($revision->revision_log->value)]]];
         // @todo Simplify once https://www.drupal.org/node/2334319 lands.
         $this->renderer->addCacheableDependency($column['data'], $username);
         $row[] = $column;
         if ($vid == $node->getRevisionId()) {
             $row[0]['class'] = ['revision-current'];
             $row[] = ['data' => SafeMarkup::placeholder($this->t('current revision')), 'class' => ['revision-current']];
         } else {
             $links = [];
             if ($revert_permission) {
                 $links['revert'] = ['title' => $this->t('Revert'), 'url' => Url::fromRoute('node.revision_revert_confirm', ['node' => $node->id(), 'node_revision' => $vid])];
             }
             if ($delete_permission) {
                 $links['delete'] = ['title' => $this->t('Delete'), 'url' => Url::fromRoute('node.revision_delete_confirm', ['node' => $node->id(), 'node_revision' => $vid])];
             }
             $row[] = ['data' => ['#type' => 'operations', '#links' => $links]];
         }
         $rows[] = $row;
     }
     $build['node_revisions_table'] = array('#theme' => 'table', '#rows' => $rows, '#header' => $header, '#attached' => array('library' => array('node/drupal.node.admin')));
     return $build;
 }

 /**
  * {@inheritdoc}
  */
 public function viewElements(FieldItemListInterface $items, $langcode)
 {
     $elements = array();
     $entity = current($this->getEntitiesToView($items, $langcode));
     if ($entity) {
         if ($entity->id()) {
             // @see \Drupal\contact\Controller\ContactController::contactSitePage().
             $config = $this->configFactory->get('contact.settings')->get();
             $message = $this->entityManager->getStorage('contact_message')->create(array('contact_form' => $entity->id()));
             $form = $this->entityFormBuilder->getForm($message);
             $form['#title'] = $entity->label();
             $form['#cache']['contexts'][] = 'user.permissions';
             $this->renderer->addCacheableDependency($form, $config);
             $elements[] = $form;
         }
     }
     return $elements;
 }