class RoleListBuilder

class RoleListBuilder extends DraggableListBuilder {
    
    /**
     * The messenger.
     *
     * @var \Drupal\Core\Messenger\MessengerInterface
     */
    protected $messenger;
    
    /**
     * RoleListBuilder constructor.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entityType
     *   The entity type definition.
     * @param \Drupal\Core\Entity\EntityStorageInterface $storage
     *   The entity storage class.
     * @param \Drupal\Core\Messenger\MessengerInterface $messenger
     *   The messenger.
     */
    public function __construct(EntityTypeInterface $entityType, EntityStorageInterface $storage, MessengerInterface $messenger) {
        parent::__construct($entityType, $storage);
        $this->messenger = $messenger;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
        return new static($entity_type, $container->get('entity_type.manager')
            ->getStorage($entity_type->id()), $container->get('messenger'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'user_admin_roles_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header['label'] = $this->t('Name');
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        $row['label'] = $entity->label();
        return $row + parent::buildRow($entity);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultOperations(EntityInterface $entity) {
        $operations = parent::getDefaultOperations($entity);
        if ($entity->hasLinkTemplate('edit-permissions-form')) {
            $operations['permissions'] = [
                'title' => $this->t('Edit permissions'),
                'weight' => 20,
                'url' => $entity->toUrl('edit-permissions-form'),
            ];
        }
        return $operations;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        parent::submitForm($form, $form_state);
        $this->messenger
            ->addStatus($this->t('The role settings have been updated.'));
    }

}