public function MenuLinkBreadcrumbFormatter::viewElements in Menu Link (Field) 8

Same name and namespace in other branches

1. 2.0.x src/Plugin/Field/FieldFormatter/MenuLinkBreadcrumbFormatter.php \Drupal\menu_link\Plugin\Field\FieldFormatter\MenuLinkBreadcrumbFormatter::viewElements()

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/MenuLinkBreadcrumbFormatter.php, line 126

Class

MenuLinkBreadcrumbFormatter

Plugin implementation of the 'menu_link_breadcrumb' formatter.

Namespace

Drupal\menu_link\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
  $elements = [];
  foreach ($items as $delta => $item) {
    $menu_links = [];
    $id = $items[$delta]
      ->getMenuPluginId();
    $parent_ids = $this->menuLinkManager
      ->getParentIds($id);
    if (!empty($parent_ids)) {
      foreach ($parent_ids as $parent_id) {
        if (!$this
          ->getSetting('parents_only') || $parent_id != $id) {
          $menu_links[] = $this->menuLinkManager
            ->createInstance($parent_id);
        }
      }
    }
    $menu_links = array_reverse($menu_links);

    // Get the links to add to the breadcrumb.
    $links = array_map(function ($link) {
      if ($this
        ->getSetting('link_to_target')) {
        $url = $link
          ->getUrlObject();
      }
      else {

        // Set URL to none if we don't want to link to the menu link target.
        $url = new Url('<none>');
      }
      return Link::fromTextAndUrl($link
        ->getTitle(), $url);
    }, $menu_links);

    // Set up the breadcrumb.
    $breadcrumb = new Breadcrumb();
    $breadcrumb
      ->setLinks($links);
    $elements[$delta] = $breadcrumb
      ->toRenderable();
  }
  return $elements;
}