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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\Plugin\CachedDiscoveryClearerInterface;
9use Drupal\display_builder\DisplayBuildablePluginManager;
10use Drupal\display_builder\Event\DisplayBuilderEvent;
11use Drupal\display_builder\Event\DisplayBuilderEvents;
12use Drupal\display_builder_page_layout\Plugin\display_builder\Buildable\PageLayout;
13use Symfony\Component\EventDispatcher\EventSubscriberInterface;
14
15/**
16 * The event subscriber for display builder islands.
17 */
18class DisplayBuilderSubscriber implements EventSubscriberInterface {
19
20  public function __construct(
21    private CachedDiscoveryClearerInterface $pluginCacheClearer,
22    private EntityTypeManagerInterface $entityTypeManager,
23    private DisplayBuildablePluginManager $displayBuildableManager,
24  ) {}
25
26  /**
27   * {@inheritdoc}
28   */
29  public static function getSubscribedEvents(): array {
30    return [
31      DisplayBuilderEvents::ON_SAVE => 'onSave',
32    ];
33  }
34
35  /**
36   * Event handler for when a display builder is saved.
37   *
38   * @param \Drupal\display_builder\Event\DisplayBuilderEvent $event
39   *   The event object.
40   */
41  public function onSave(DisplayBuilderEvent $event): void {
42    $builder_id = $event->getBuilderId();
43    $contexts = $event->getData();
44    $params = PageLayout::checkInstanceId($builder_id);
45
46    if (!$params) {
47      return;
48    }
49
50    // Context requirements is set to allow SourcePlugin when editing. We need
51    // a precedence when saving.
52    // @todo perhaps we need a third context.
53    /** @var \Drupal\display_builder\InstanceInterface $instance */
54    $instance = $this->entityTypeManager->getStorage('display_builder_instance')->load($builder_id);
55
56    if (!$instance->hasSaveContextsRequirement(PageLayout::getContextRequirement(), $contexts)) {
57      return;
58    }
59    $page_layout_id = $params['page_layout'] ?? NULL;
60
61    if (!$page_layout_id) {
62      // This must never happen because PageLayout::checkInstanceId() always
63      // return a page_layout key.
64      return;
65    }
66    /** @var \Drupal\display_builder_page_layout\PageLayoutInterface $page_layout */
67    $page_layout = $this->entityTypeManager->getStorage('page_layout')->load($page_layout_id);
68    /** @var \Drupal\display_builder\DisplayBuildableInterface $buildable */
69    $buildable = $this->displayBuildableManager->createInstance('page_layout', ['entity' => $page_layout]);
70    $buildable->saveSources();
71    // Clearing plugin cache seems enough to get the new layout.
72    // @todo It looks very costly. Check if it is still needed.
73    $this->pluginCacheClearer->clearCachedDefinitions();
74  }
75
76}