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1<?php
2
3declare(strict_types=1);
4
5namespace Drupal\display_builder_page_layout\EventSubscriber;
6
7use Drupal\Core\Entity\EntityTypeManagerInterface;
8use Drupal\Core\Render\PageDisplayVariantSelectionEvent;
9use Drupal\Core\Render\RenderEvents;
10use Symfony\Component\EventDispatcher\EventSubscriberInterface;
11
12/**
13 * Drupal should return a display builder page for any non admin route.
14 *
15 * @code
16 * route.name:
17 *  ...
18 *  options:
19 *    _admin_route: false
20 *    _display_builder_route: true
21 *
22 * @endcode
23 */
24class PageVariantSubscriber implements EventSubscriberInterface {
25
26  public function __construct(
27    private EntityTypeManagerInterface $entityTypeManager,
28  ) {}
29
30  /**
31   * {@inheritdoc}
32   */
33  public static function getSubscribedEvents(): array {
34    return [
35      RenderEvents::SELECT_PAGE_DISPLAY_VARIANT => [
36        ['onSelectPageDisplayVariant', -100],
37      ],
38    ];
39  }
40
41  /**
42   * Selects the page display variant.
43   *
44   * @param \Drupal\Core\Render\PageDisplayVariantSelectionEvent $event
45   *   The event to process.
46   */
47  public function onSelectPageDisplayVariant(PageDisplayVariantSelectionEvent $event): void {
48    $route = $event->getRouteMatch()->getRouteObject();
49    $options = $route->getOptions();
50
51    // In admin pages, we want the page.html.twig from the admin theme.
52    // For now we don't build pages for Admin routes, but this will be possible
53    // in the future.
54    if ($options['_admin_route'] ?? FALSE) {
55      return;
56    }
57
58    // When we use Display Builder to build the full page, we don't want to have
59    // neither the theme's page.html.twig nor the page managed by Display
60    // Builder. We want a simple blank page.
61    // Example: entity.page_layout.display_builder.
62    if ($options['_display_builder_route'] ?? FALSE) {
63      $event->setPluginId('simple_page');
64
65      return;
66    }
67
68    // Fallback to Block Layout if there is no suitable Page Layout entities.
69    /** @var \Drupal\display_builder_page_layout\AccessControlHandler $access_control */
70    $access_control = $this->entityTypeManager->getAccessControlHandler('page_layout');
71    $page_layout = $access_control->loadCurrentPageLayout();
72
73    if (!$page_layout) {
74      return;
75    }
76
77    // Every other pages must be managed by Display Builder.
78    $event->setPluginId('display_builder');
79  }
80
81}