function NavigationMenuLinkTree::build

Overrides MenuLinkTree::build

File

core/modules/navigation/src/Menu/NavigationMenuLinkTree.php, line 19

Class

NavigationMenuLinkTree

Extends MenuLinkTree to add specific theme suggestions for the navigation.

Namespace

Code

public function build(array $tree) : array {
  if (!$tree) {
    return [];
  }
  $build = parent::build($tree);
  if (empty($build['#items'])) {
    return [];
  }
  /** @var \Drupal\Core\Menu\MenuLinkInterface $link */
  $first_link = reset($tree)->link;
  // Get the menu name of the first link.
  $menu_name = $first_link->getMenuName();
  // Add a more specific theme suggestion to differentiate this rendered
  // menu from others.
  $build['#menu_name'] = $menu_name;
  $build['#theme'] = 'navigation_menu__' . strtr($menu_name, '-', '_');
  // Loop through menu items and add the plugin id as a class.
  foreach ($tree as $item) {
    if ($item->access
      ->isAllowed()) {
      $plugin_id = $item->link
        ->getPluginId();
      $plugin_class = str_replace('.', '_', $plugin_id);
      $build['#items'][$plugin_id]['class'] = $plugin_class;
    }
  }
  return $build;
}