diff core/modules/block_place/src/EventSubscriber/BlockPlaceEventSubscriber.php @ 0:c75dbcec494b

Initial commit from drush-created site

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/block_place/src/EventSubscriber/BlockPlaceEventSubscriber.php	Thu Jul 05 14:24:15 2018 +0000
@@ -0,0 +1,67 @@
+<?php
+
+namespace Drupal\block_place\EventSubscriber;
+
+use Drupal\Core\Render\PageDisplayVariantSelectionEvent;
+use Drupal\Core\Render\RenderEvents;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Drupal\Core\Session\AccountInterface;
+
+/**
+ * @see \Drupal\block_place\Plugin\DisplayVariant\PlaceBlockPageVariant
+ */
+class BlockPlaceEventSubscriber implements EventSubscriberInterface {
+
+  /**
+   * The request stack.
+   *
+   * @var \Symfony\Component\HttpFoundation\RequestStack
+   */
+  protected $requestStack;
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $account;
+
+  /**
+   * Constructs a \Drupal\block_place\EventSubscriber\BlockPlaceEventSubscriber object.
+   *
+   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
+   *   The request stack used to retrieve the current request.
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The current user.
+   */
+  public function __construct(RequestStack $request_stack, AccountInterface $account) {
+    $this->requestStack = $request_stack;
+    $this->account = $account;
+  }
+
+  /**
+   * Selects the block place override of the block page display variant.
+   *
+   * @param \Drupal\Core\Render\PageDisplayVariantSelectionEvent $event
+   *   The event to process.
+   */
+  public function onBlockPageDisplayVariantSelected(PageDisplayVariantSelectionEvent $event) {
+    if ($event->getPluginId() === 'block_page') {
+      if ($this->requestStack->getCurrentRequest()->query->has('block-place') && $this->account->hasPermission('administer blocks')) {
+        $event->setPluginId('block_place_page');
+      }
+      $event->addCacheContexts(['user.permissions', 'url.query_args']);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    // Set a very low priority, so that it runs last.
+    $events[RenderEvents::SELECT_PAGE_DISPLAY_VARIANT][] = ['onBlockPageDisplayVariantSelected', -1000];
+    return $events;
+  }
+
+}