NavigationMenuBlock.php

<?php

declare (strict_types=1);
namespace Drupal\navigation\Plugin\Block;

use Drupal\Core\Block\Attribute\Block;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Menu\MenuTreeParameters;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\navigation\Plugin\Derivative\SystemMenuNavigationBlock as SystemMenuNavigationBlockDeriver;
use Drupal\system\Plugin\Block\SystemMenuBlock;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a generic menu navigation block.
 *
 * @internal
 */
final class NavigationMenuBlock extends SystemMenuBlock implements ContainerFactoryPluginInterface {
  const NAVIGATION_MAX_DEPTH = 3;
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : static {
    return new static($configuration, $plugin_id, $plugin_definition, $container->get('navigation.menu_tree'), $container->get('menu.active_trail'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() : array {
    return [
      'level' => 1,
      'depth' => 0,
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function blockForm($form, FormStateInterface $form_state) : array {
    $form = parent::blockForm($form, $form_state);
    unset($form['menu_levels']['expand_all_items']);
    $form['menu_levels']['depth']['#options'] = range(1, static::NAVIGATION_MAX_DEPTH);
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  public function blockSubmit($form, FormStateInterface $form_state) : void {
    $this->configuration['level'] = $form_state->getValue('level');
    $this->configuration['depth'] = $form_state->getValue('depth');
  }
  
  /**
   * {@inheritdoc}
   */
  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;
  }
  
  /**
   * {@inheritdoc}
   */
  public function calculateDependencies() {
    return [
      'module' => [
        'system',
      ],
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCacheContexts() : array {
    // We don't use menu active trails here.
    return array_filter(parent::getCacheContexts(), static fn(string $tag) => !str_starts_with($tag, 'route.menu_active_trails'));
  }

}