Adds an "overview" child link to second level menu links with children.

In the navigation menu, a second-level menu item is a link if it does not have children, but if it does, it instead becomes a button that opens its child menu. To provide a way to access the page a second-level menu item links to, add an "overview" link that links to the page as a child (third-level) menu item.

Parameters

\Drupal\Core\Menu\MenuLinkTreeElement[] $tree: The menu link tree to manipulate.

Return value

\Drupal\Core\Menu\MenuLinkTreeElement[] The manipulated menu link tree.

File

core/modules/navigation/src/Menu/NavigationMenuLinkTreeManipulators.php, line 46

Class

NavigationMenuLinkTreeManipulators

Provides a menu link tree manipulator for the navigation menu block.

Namespace

Drupal\navigation\Menu

Code

public function addSecondLevelOverviewLinks(array $tree) : array {
  if (!$tree) {
    return [];
  }
  foreach ($tree as $item) {
    if (!$this->isEnabledAndAccessible($item)) {
      continue;
    }
    foreach ($item->subtree as $sub_item) {
      if ($this->shouldAddOverviewLink($sub_item)) {
        $this->addOverviewLink($sub_item);
      }
    }
  }
  return $tree;
}

---