Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\block_place\EventSubscriber;
Chris@0: 
Chris@0: use Drupal\Core\Render\PageDisplayVariantSelectionEvent;
Chris@0: use Drupal\Core\Render\RenderEvents;
Chris@0: use Symfony\Component\EventDispatcher\EventSubscriberInterface;
Chris@0: use Symfony\Component\HttpFoundation\RequestStack;
Chris@0: use Drupal\Core\Session\AccountInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * @see \Drupal\block_place\Plugin\DisplayVariant\PlaceBlockPageVariant
Chris@0:  */
Chris@0: class BlockPlaceEventSubscriber implements EventSubscriberInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The request stack.
Chris@0:    *
Chris@0:    * @var \Symfony\Component\HttpFoundation\RequestStack
Chris@0:    */
Chris@0:   protected $requestStack;
Chris@0: 
Chris@0:   /**
Chris@0:    * The current user.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Session\AccountInterface
Chris@0:    */
Chris@0:   protected $account;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a \Drupal\block_place\EventSubscriber\BlockPlaceEventSubscriber object.
Chris@0:    *
Chris@0:    * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
Chris@0:    *   The request stack used to retrieve the current request.
Chris@0:    * @param \Drupal\Core\Session\AccountInterface $account
Chris@0:    *   The current user.
Chris@0:    */
Chris@0:   public function __construct(RequestStack $request_stack, AccountInterface $account) {
Chris@0:     $this->requestStack = $request_stack;
Chris@0:     $this->account = $account;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Selects the block place override of the block page display variant.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Render\PageDisplayVariantSelectionEvent $event
Chris@0:    *   The event to process.
Chris@0:    */
Chris@0:   public function onBlockPageDisplayVariantSelected(PageDisplayVariantSelectionEvent $event) {
Chris@0:     if ($event->getPluginId() === 'block_page') {
Chris@0:       if ($this->requestStack->getCurrentRequest()->query->has('block-place') && $this->account->hasPermission('administer blocks')) {
Chris@0:         $event->setPluginId('block_place_page');
Chris@0:       }
Chris@0:       $event->addCacheContexts(['user.permissions', 'url.query_args']);
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public static function getSubscribedEvents() {
Chris@0:     // Set a very low priority, so that it runs last.
Chris@0:     $events[RenderEvents::SELECT_PAGE_DISPLAY_VARIANT][] = ['onBlockPageDisplayVariantSelected', -1000];
Chris@0:     return $events;
Chris@0:   }
Chris@0: 
Chris@0: }