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;
}