Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\system\Plugin\Block;
Chris@0: 
Chris@0: use Drupal\Core\Block\BlockBase;
Chris@0: use Drupal\Core\Block\MessagesBlockPluginInterface;
Chris@0: use Drupal\Core\Cache\Cache;
Chris@0: 
Chris@0: /**
Chris@0:  * Provides a block to display the messages.
Chris@0:  *
Chris@17:  * @see @see \Drupal\Core\Messenger\MessengerInterface
Chris@0:  *
Chris@0:  * @Block(
Chris@0:  *   id = "system_messages_block",
Chris@0:  *   admin_label = @Translation("Messages")
Chris@0:  * )
Chris@0:  */
Chris@0: class SystemMessagesBlock extends BlockBase implements MessagesBlockPluginInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function defaultConfiguration() {
Chris@0:     return [
Chris@0:       'label_display' => FALSE,
Chris@0:     ];
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function build() {
Chris@0:     return ['#type' => 'status_messages'];
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getCacheMaxAge() {
Chris@0:     // The messages are session-specific and hence aren't cacheable, but the
Chris@0:     // block itself *is* cacheable because it uses a #lazy_builder callback and
Chris@0:     // hence the block has a globally cacheable render array.
Chris@0:     return Cache::PERMANENT;
Chris@0:   }
Chris@0: 
Chris@0: }