setPluginConfiguration example

class TestPageDisplayVariantSubscriber implements EventSubscriberInterface {

  /** * Selects the page display variant. * * @param \Drupal\Core\Render\PageDisplayVariantSelectionEvent $event * The event to process. */
  public function onSelectPageDisplayVariant(PageDisplayVariantSelectionEvent $event) {
    $event->setPluginId('display_variant_test');
    $event->setPluginConfiguration(['required_configuration' => 'A very important, required value.']);
    $event->addCacheTags(['custom_cache_tag']);

    $context = new Context(new ContextDefinition('string', NULL, TRUE), 'Explicitly passed in context.');
    $event->setContexts(['context' => $context]);
  }

  /** * {@inheritdoc} */
  public static function getSubscribedEvents(): array {
    $events[RenderEvents::SELECT_PAGE_DISPLAY_VARIANT][] = ['onSelectPageDisplayVariant'];