public function MenuTreeFormatter::viewElements in Field Menu 8

Builds a renderable array for a field value.

Parameters

\Drupal\Core\Field\FieldItemListInterface $items: The field values to be rendered.

string $langcode: The language that should be used to render the field.

Return value

array A renderable array for $items, as an array of child elements keyed by consecutive numeric indexes starting from 0.

Overrides FormatterInterface::viewElements

File

src/Plugin/Field/FieldFormatter/MenuTreeFormatter.php, line 79

Class

MenuTreeFormatter

Plugin implementation of the 'field_menu_tree_formatter' formatter.

Namespace

Drupal\field_menu\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
  $elements = [];
  foreach ($items as $delta => $item) {
    $menu_key_value_arr = explode(':', $item->menu_item_key);
    $menu_name = isset($menu_key_value_arr[0]) && $menu_key_value_arr[0] ? $menu_key_value_arr[0] : NULL;
    $parent = isset($menu_key_value_arr[1]) && $menu_key_value_arr[1] ? $menu_key_value_arr[1] : NULL;
    $menu_link = isset($menu_key_value_arr[2]) && $menu_key_value_arr[2] ? $menu_key_value_arr[2] : NULL;
    $menu_route = $parent == 'menu_link_content' ? $parent . ':' . $menu_link : $parent;
    $menu_parameters = new MenuTreeParameters();
    $menu_parameters
      ->setRoot($menu_route);
    $menu_parameters
      ->onlyEnabledLinks();
    if ($item->max_depth > 0) {
      $menu_parameters
        ->setMaxDepth($item->max_depth);
    }
    if (!$item->include_root) {
      $menu_parameters
        ->excludeRoot();
    }
    $tree = $this->menuLinkTree
      ->load($menu_name, $menu_parameters);
    $manipulators = [
      [
        'callable' => 'menu.default_tree_manipulators:checkNodeAccess',
      ],
      [
        'callable' => 'menu.default_tree_manipulators:checkAccess',
      ],
      [
        'callable' => 'menu.default_tree_manipulators:generateIndexAndSort',
      ],
    ];
    $tree = $this->menuLinkTree
      ->transform($tree, $manipulators);
    $tree_render_array = $this->menuLinkTree
      ->build($tree);
    $menu_title = trim($item->menu_title);
    $elements[$delta] = [
      '#theme' => 'field_menu_item',
      '#title' => $menu_title,
      '#tree' => $tree_render_array,
      '#cache' => [
        'contexts' => [
          'languages:' . LanguageInterface::TYPE_INTERFACE,
        ],
      ],
    ];
  }
  return $elements;
}