twig_tweak-8.x-2.8/src/View/RegionViewBuilder.php

<?php

declare(strict_types=1);

namespace Drupal\twig_tweak\View;

use Drupal\Core\Block\TitleBlockPluginInterface;
use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Controller\TitleResolverInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Routing\RouteObjectInterface;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * Region view builder.
 */
final readonly class RegionViewBuilder {

  /**
   * {@selfdoc}
   */
  public function __construct(
    public EntityTypeManagerInterface $entityTypeManager,
    public ConfigFactoryInterface $configFactory,
    public RequestStack $requestStack,
    public TitleResolverInterface $titleResolver,
  ) {}

  /**
   * Builds the render array of a given region.
   *
   * @param non-empty-string $region
   *   The region to build.
   * @param non-empty-string|null $theme
   *   (optional) The name of the theme to load the region. If it is not
   *   provided then default theme will be used.
   *
   * @return array
   *   A render array to display the region content.
   */
  public function build(string $region, ?string $theme = NULL): array {

    $blocks = $this->entityTypeManager->getStorage('block')->loadByProperties([
      'region' => $region,
      'theme'  => $theme ?: $this->configFactory->get('system.theme')->get('default'),
    ]);

    $view_builder = $this->entityTypeManager->getViewBuilder('block');

    $build = [];

    $entity_type = $this->entityTypeManager->getDefinition('block');
    $cache_metadata = (new CacheableMetadata())
      ->addCacheTags($entity_type->getListCacheTags())
      ->addCacheContexts($entity_type->getListCacheContexts());

    /** @var \Drupal\block\BlockInterface[] $blocks */
    foreach ($blocks as $id => $block) {
      $access = $block->access('view', NULL, TRUE);
      $cache_metadata = $cache_metadata->addCacheableDependency($access);
      if (!$access->isAllowed()) {
        continue;
      }
      $block_plugin = $block->getPlugin();
      // Title block requires special treatment.
      if ($block_plugin instanceof TitleBlockPluginInterface) {
        $request = $this->requestStack->getCurrentRequest();
        if ($route = $request->attributes->get(RouteObjectInterface::ROUTE_OBJECT)) {
          $block_plugin->setTitle($this->titleResolver->getTitle($request, $route));
        }
      }
      $build[$id] = $view_builder->view($block);
    }

    if ($build) {
      $build['#region'] = $region;
      $build['#theme_wrappers'] = ['region'];
    }
    $cache_metadata->applyTo($build);

    return $build;
  }

}