Returns a rendered menu tree.

The menu item's LI element is given one of the following classes:

• expanded: The menu item is showing its submenu.
• collapsed: The menu item has a submenu which is not shown.

Parameters

array $tree: A data structure representing the tree as returned from buildBookOutlineData.

Return value

array A structured array to be rendered by \Drupal\Core\Render\RendererInterface::render().

Overrides BookManagerInterface::bookTreeOutput

File

core/modules/book/src/BookManager.php, line 579

Class

BookManager

Defines a book manager.

Namespace

Drupal\book

Code

public function bookTreeOutput(array $tree) {
  $items = $this->buildItems($tree);
  $build = [];
  if ($items) {
    // Make sure Drupal\Core\Render\Element::children() does not re-order the
    // links.
    $build['#sorted'] = TRUE;
    // Get the book id from the last link.
    $item = end($items);
    // Add the theme wrapper for outer markup.
    // Allow menu-specific theme overrides.
    $build['#theme'] = 'book_tree__book_toc_' . $item['original_link']['bid'];
    $build['#items'] = $items;
    // Set cache tag.
    $build['#cache']['tags'][] = 'config:system.book.' . $item['original_link']['bid'];
  }
  return $build;
}

---