public static function OffCanvas::preRender in Responsive and off-canvas menu 4.4.x

Same name and namespace in other branches

1. 4.0.x src/OffCanvas.php \Drupal\responsive_menu\OffCanvas::preRender()
2. 4.1.x src/OffCanvas.php \Drupal\responsive_menu\OffCanvas::preRender()
3. 4.3.x src/OffCanvas.php \Drupal\responsive_menu\OffCanvas::preRender()

Pre render callback to assemble the menu as markup.

Parameters

array $build: The render array to modify.

Return value

array The built render array.

File

src/OffCanvas.php, line 33

Class

OffCanvas

Provides the HorizontalMenu block.

Namespace

Drupal\responsive_menu

Code

public static function preRender(array $build) {
  $off_canvas_menus = \Drupal::config('responsive_menu.settings')
    ->get('off_canvas_menus');

  // Other modules can modify the menu names so we need to take this into
  // account when building the menu.
  \Drupal::ModuleHandler()
    ->alter('responsive_menu_off_canvas_menu_names', $off_canvas_menus);
  $menus = explode(',', $off_canvas_menus);
  $combined_tree = [];
  $menu_tree = \Drupal::menuTree();
  $manipulators = [
    // Show links to nodes that are accessible for the current user.
    [
      'callable' => 'menu.default_tree_manipulators:checkNodeAccess',
    ],
    // Only show links that are accessible for the current user.
    [
      'callable' => 'menu.default_tree_manipulators:checkAccess',
    ],
    // Use the default sorting of menu links.
    [
      'callable' => 'menu.default_tree_manipulators:generateIndexAndSort',
    ],
  ];

  // Allow other modules to alter manipulators before transforming menu tree.
  \Drupal::ModuleHandler()
    ->alter('responsive_menu_off_canvas_manipulators', $manipulators);

  // Iterate over the menus and merge them together.
  foreach ($menus as $menu_name) {
    $menu_name = trim($menu_name);
    $parameters = $menu_tree
      ->getCurrentRouteMenuTreeParameters($menu_name);

    // Force the entire tree to be build by setting expandParents to an
    // empty array.
    $parameters->expandedParents = [];
    $tree_items = $menu_tree
      ->load($menu_name, $parameters);
    $tree_manipulated = $menu_tree
      ->transform($tree_items, $manipulators);
    $combined_tree = array_merge($combined_tree, $tree_manipulated);
    $build['#cache']['contexts'][] = 'route.menu_active_trails:' . $menu_name;
    $build['#cache']['tags'][] = 'config:system.menu.' . $menu_name;
    $build['#cache']['tags'][] = 'offcanvas_render';
  }
  $menu = $menu_tree
    ->build($combined_tree);

  // Manipulate the #theme element to provide a known working template, rather
  // than leave it up to the theme to provide one which may break the
  // off-canvas menu.
  $menu['#theme'] = 'responsive_menu_off_canvas';

  // Allow other modules to manipulate the built tree data.
  \Drupal::ModuleHandler()
    ->alter('responsive_menu_off_canvas_tree', $menu);
  $build['#markup'] = \Drupal::service("renderer")
    ->renderRoot($menu);
  return $build;
}