/**
* 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]);
}
