Chris@0: {#
Chris@0: /**
Chris@0:  * @file
Chris@0:  * Theme override to navigate books.
Chris@0:  *
Chris@0:  * Presented under nodes that are a part of book outlines.
Chris@0:  *
Chris@0:  * Available variables:
Chris@0:  * - tree: The immediate children of the current node rendered as an unordered
Chris@0:  *   list.
Chris@0:  * - current_depth: Depth of the current node within the book outline. Provided
Chris@0:  *   for context.
Chris@0:  * - prev_url: URL to the previous node.
Chris@0:  * - prev_title: Title of the previous node.
Chris@0:  * - parent_url: URL to the parent node.
Chris@0:  * - parent_title: Title of the parent node. Not printed by default. Provided
Chris@0:  *   as an option.
Chris@0:  * - next_url: URL to the next node.
Chris@0:  * - next_title: Title of the next node.
Chris@0:  * - has_links: Flags TRUE whenever the previous, parent or next data has a
Chris@0:  *   value.
Chris@0:  * - book_id: The book ID of the current outline being viewed. Same as the node
Chris@0:  *   ID containing the entire outline. Provided for context.
Chris@0:  * - book_url: The book/node URL of the current outline being viewed. Provided
Chris@0:  *   as an option. Not used by default.
Chris@0:  * - book_title: The book/node title of the current outline being viewed.
Chris@0:  *
Chris@0:  * @see template_preprocess_book_navigation()
Chris@0:  */
Chris@0: #}
Chris@0: {{ attach_library('classy/book-navigation') }}
Chris@0: {% if tree or has_links %}
Chris@0:   <nav id="book-navigation-{{ book_id }}" class="book-navigation" role="navigation" aria-labelledby="book-label-{{ book_id }}">
Chris@0:     {{ tree }}
Chris@0:     {% if has_links %}
Chris@0:       <h2 class="visually-hidden" id="book-label-{{ book_id }}">{{ 'Book traversal links for'|t }} {{ book_title }}</h2>
Chris@0:       <ul class="book-pager">
Chris@0:       {% if prev_url %}
Chris@0:         <li class="book-pager__item book-pager__item--previous">
Chris@0:           <a href="{{ prev_url }}" rel="prev" title="{{ 'Go to previous page'|t }}"><b>{{ '‹'|t }}</b> {{ prev_title }}</a>
Chris@0:         </li>
Chris@0:       {% endif %}
Chris@0:       {% if parent_url %}
Chris@0:         <li class="book-pager__item book-pager__item--center">
Chris@0:           <a href="{{ parent_url }}" title="{{ 'Go to parent page'|t }}">{{ 'Up'|t }}</a>
Chris@0:         </li>
Chris@0:       {% endif %}
Chris@0:       {% if next_url %}
Chris@0:         <li class="book-pager__item book-pager__item--next">
Chris@0:           <a href="{{ next_url }}" rel="next" title="{{ 'Go to next page'|t }}">{{ next_title }} <b>{{ '›'|t }}</b></a>
Chris@0:         </li>
Chris@0:       {% endif %}
Chris@0:     </ul>
Chris@0:     {% endif %}
Chris@0:   </nav>
Chris@0: {% endif %}