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<?php
namespace Drupal\layout_builder\EventSubscriber;
use Drupal\Core\Messenger\MessengerInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\layout_builder\Event\PrepareLayoutEvent;
use Drupal\layout_builder\LayoutBuilderEvents;
use Drupal\layout_builder\LayoutTempstoreRepositoryInterface;
use Drupal\layout_builder\OverridesSectionStorageInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
/**
* An event subscriber to prepare section storage.
*
* Section storage works via the
* \Drupal\layout_builder\Event\PrepareLayoutEvent.
*
* @see \Drupal\layout_builder\Event\PrepareLayoutEvent
* @see \Drupal\layout_builder\Element\LayoutBuilder::prepareLayout()
*/
class PrepareLayout implements EventSubscriberInterface {
use StringTranslationTrait;
/**
* The layout tempstore repository.
*
* @var \Drupal\layout_builder\LayoutTempstoreRepositoryInterface
*/
protected $layoutTempstoreRepository;
/**
* The messenger service.
*
* @var \Drupal\Core\Messenger\MessengerInterface
*/
protected $messenger;
/**
* Constructs a new PrepareLayout.
*
* @param \Drupal\layout_builder\LayoutTempstoreRepositoryInterface $layout_tempstore_repository
* The tempstore repository.
* @param \Drupal\Core\Messenger\MessengerInterface $messenger
* The messenger service.
*/
public function __construct(LayoutTempstoreRepositoryInterface $layout_tempstore_repository, MessengerInterface $messenger) {
$this->layoutTempstoreRepository = $layout_tempstore_repository;
$this->messenger = $messenger;
}
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents(): array {
$events[LayoutBuilderEvents::PREPARE_LAYOUT][] = ['onPrepareLayout', 10];
return $events;
}
/**
* Prepares a layout for use in the UI.
*
* @param \Drupal\layout_builder\Event\PrepareLayoutEvent $event
* The prepare layout event.
*/
public function onPrepareLayout(PrepareLayoutEvent $event) {
$section_storage = $event->getSectionStorage();
// If the layout has pending changes, add a warning.
if ($this->layoutTempstoreRepository->has($section_storage)) {
$this->messenger->addWarning($this->t('You have unsaved changes.'));
}
else {
// If the layout is an override that has not yet been overridden, copy the
// sections from the corresponding default.
if ($section_storage instanceof OverridesSectionStorageInterface && !$section_storage->isOverridden()) {
$sections = $section_storage->getDefaultSectionStorage()->getSections();
foreach ($sections as $section) {
$section_storage->appendSection($section);
}
}
// Add storage to tempstore regardless of what the storage is.
$this->layoutTempstoreRepository->set($section_storage);
}
}
}
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