4 * Default theme implementation to display a book tree.
6 * Returns HTML for a wrapper for a book sub-tree.
9 * - items: A nested list of book items. Each book item contains:
10 * - attributes: HTML attributes for the book item.
11 * - below: The book item child items.
12 * - title: The book link title.
13 * - url: The book link URL, instance of \Drupal\Core\Url.
14 * - is_expanded: TRUE if the link has visible children within the current
16 * - is_collapsed: TRUE if the link has children within the current book tree
17 * that are not currently visible.
18 * - in_active_trail: TRUE if the link is in the active trail.
23 {% import _self as book_tree %}
26 We call a macro which calls itself to render the full tree.
27 @see http://twig.sensiolabs.org/doc/tags/macro.html
29 {{ book_tree.book_links(items, attributes, 0) }}
31 {% macro book_links(items, attributes, menu_level) %}
32 {% import _self as book_tree %}
34 {% if menu_level == 0 %}
39 {% for item in items %}
40 <li{{ item.attributes }}>
41 {{ link(item.title, item.url) }}
43 {{ book_tree.book_links(item.below, attributes, menu_level + 1) }}