[ [static::class, 'preRenderPlaceholder'], ], '#id' => NULL, ]; } /** * Pre-render callback: Renders a contextual links placeholder into #markup. * * Renders an empty (hence invisible) placeholder div with a data-attribute * that contains an identifier ("contextual id"), which allows the JavaScript * of the drupal.contextual-links library to dynamically render contextual * links. * * @param array $element * A structured array with #id containing a "contextual id". * * @return array * The passed-in element with a contextual link placeholder in '#markup'. * * @see \Drupal\contextual\ContextualLinksSerializer::linksToId() */ public static function preRenderPlaceholder(array $element) { $token = Crypt::hmacBase64($element['#id'], Settings::getHashSalt() . \Drupal::service('private_key')->get()); $attribute = new Attribute([ 'data-contextual-id' => $element['#id'], 'data-contextual-token' => $token, 'data-drupal-ajax-container' => '', ]); $element['#markup'] = new FormattableMarkup('', ['@attributes' => $attribute]); $element['#attached']['drupalSettings']['contextual']['theme'] = \Drupal::service('theme.manager')->getActiveTheme()->getName(); $cache = CacheableMetadata::createFromRenderArray($element); $cache->addCacheContexts(['theme']); $cache->applyTo($element); return $element; } }