function NavigationMenuBlock::build

Overrides SystemMenuBlock::build

File

core/modules/navigation/src/Plugin/Block/NavigationMenuBlock.php, line 76

Class

NavigationMenuBlock

Provides a generic menu navigation block.

Namespace

Code

public function build() : array {
  $menu_name = $this->getDerivativeId();
  $level = $this->configuration['level'];
  $depth = $this->configuration['depth'];
  $parameters = new MenuTreeParameters();
  $parameters->setMinDepth($level)
    ->setMaxDepth(min($level + $depth, $this->menuTree
    ->maxDepth()))
    ->onlyEnabledLinks();
  $tree = $this->menuTree
    ->load($menu_name, $parameters);
  $manipulators = [
    [
      'callable' => 'menu.default_tree_manipulators:checkAccess',
    ],
    [
      'callable' => 'menu.default_tree_manipulators:generateIndexAndSort',
    ],
  ];
  $tree = $this->menuTree
    ->transform($tree, $manipulators);
  $build = $this->menuTree
    ->build($tree);
  if (!empty($build)) {
    $build['#title'] = $this->configuration['label'];
  }
  return $build;
}