/** * {@inheritdoc} */ public function preprocessVariables(Variables $variables) { $breadcrumb =& $variables['breadcrumb']; // Determine if breadcrumbs should be displayed. $breadcrumb_visibility = $this->theme->getSetting('breadcrumb'); if ($breadcrumb_visibility == 0 || $breadcrumb_visibility == 2 && \Drupal::service('router.admin_context')->isAdminRoute() || empty($breadcrumb)) { $breadcrumb = []; return; } // Optionally get rid of the homepage link. $show_breadcrumb_home = $this->theme->getSetting('breadcrumb_home'); if (!$show_breadcrumb_home) { array_shift($breadcrumb); } if ($this->theme->getSetting('breadcrumb_title') && !empty($breadcrumb)) { $request = \Drupal::request(); $route_match = \Drupal::routeMatch(); $page_title = \Drupal::service('title_resolver')->getTitle($request, $route_match->getRouteObject()); if (!empty($page_title)) { $breadcrumb[] = ['text' => $page_title, 'attributes' => new Attribute(['class' => ['active']])]; // Add cache context based on url. $variables->addCacheContexts(['url']); } } }