material_base-8.x-2.x-dev/themes/material_base_mdc/templates/navigation/menu--navbar.html.twig

{#
/**
 * @file
 * Theme override to display a menu.
 *
 * Available variables:
 * - menu_name: The machine name of the menu.
 * - items: A nested list of menu items. Each menu item contains:
 *   - attributes: HTML attributes for the menu item.
 *   - below: The menu item child items.
 *   - title: The menu link title.
 *   - url: The menu link url, instance of \Drupal\Core\Url
 *   - localized_options: Menu link localized options.
 *   - is_expanded: TRUE if the link has visible children within the current
 *     menu tree.
 *   - is_collapsed: TRUE if the link has children within the current menu tree
 *     that are not currently visible.
 *   - in_active_trail: TRUE if the link is in the active trail.
 */
#}
{% import _self as menus %}

{#
  We call a macro which calls itself to render the full tree.
  @see https://twig.symfony.com/doc/1.x/tags/macro.html
#}
<div class="navbar-menu navbar-menu--dropdown">
  {{ menus.menu_links(items, attributes, 0) }}
</div>

{% macro menu_links(items, attributes, menu_level) %}
  {% import _self as menus %}
  {% if items %}
    {% if menu_level == 0 %}
      <ul{{ attributes.addClass('menu', 'menu--level-' ~ menu_level, 'mdc-menu-dropdown__group') }}>
    {% else %}
      <div class="mdc-menu-surface--anchor">
      <div class="mdc-menu mdc-menu-surface navbar-menu--level-{{ menu_level }}" data-mdc-auto-init="MDCMenu">
      <ul class="menu menu--level-{{ menu_level }} mdc-deprecated-list" role="menu" aria-hidden="true" aria-orientation="vertical" tabindex="-1" data-mdc-auto-init="MDCList">
    {% endif %}
    {% for item in items %}
      {% set classes = [
          'menu-item',
          item.is_expanded ? 'menu-item--expanded',
          item.is_collapsed ? 'menu-item--collapsed',
          item.in_active_trail ? 'menu-item--active-trail',
          item.is_expanded and menu_level == 0 ? 'mdc-menu-dropdown',
      ] %}
      <li{{ item.attributes.addClass(classes) }}>
        {% set item_label %}
          {% if menu_level == 1 %}
            <span class="mdc-deprecated-list-item__ripple"></span>
          {% endif %}
          <span class="navbar-menu__item-text {{ menu_level == 1 ? ' mdc-deprecated-list-item__text'}}">{{ item.title }}</span>
          {% if item.is_expanded and menu_level == 0 %}
            {% include "@material_base/components/01_atoms/icon.twig" with {
              data: {
                value: 'arrow_drop_down',
              },
              settings: {
                type: 'svg-sprite',
                classes: ['navbar-menu__item-icon'],
              }
            } %}
          {% endif %}
        {% endset %}
        {% set item_classes = [
          'navbar-menu__item',
          item.is_expanded and menu_level == 0 ? 'mdc-menu-dropdown__toggle',
          menu_level == 1 ? 'mdc-deprecated-list-item',
        ] %}
        {{ link(item_label, item.url, { 'class': item_classes, 'data-mdc-auto-init': 'MDCRipple' }) }}
        {% if item.below %}
          {{ menus.menu_links(item.below, attributes, menu_level + 1) }}
        {% endif %}
      </li>
    {% endfor %}
    </ul>
    {% if menu_level != 0 %}
      </div>
      </div>
    {% endif %}
  {% endif %}
{% endmacro %}