class WorkflowListBuilder

class WorkflowListBuilder extends ConfigEntityListBuilder {
  
  /**
   * The workflow type plugin manager.
   *
   * @var \Drupal\Component\Plugin\PluginManagerInterface
   */
  protected $workflowTypeManager;
  
  /**
   * {@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('plugin.manager.workflows.type'));
  }
  
  /**
   * Constructs a new WorkflowListBuilder object.
   *
   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
   *   The entity type definition.
   * @param \Drupal\Core\Entity\EntityStorageInterface $storage
   *   The entity storage class.
   * @param \Drupal\Component\Plugin\PluginManagerInterface $workflow_type_manager
   *   The workflow type plugin manager.
   */
  public function __construct(EntityTypeInterface $entity_type, EntityStorageInterface $storage, PluginManagerInterface $workflow_type_manager) {
    parent::__construct($entity_type, $storage);
    $this->workflowTypeManager = $workflow_type_manager;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'workflow_admin_overview_form';
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildHeader() {
    $header['label'] = $this->t('Workflow');
    $header['type'] = $this->t('Type');
    $header['states'] = $this->t('States');
    return $header + parent::buildHeader();
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildRow(EntityInterface $entity) {
    /** @var \Drupal\workflows\WorkflowInterface $entity */
    $row['label'] = $entity->label();
    $row['type']['data'] = [
      '#markup' => $entity->getTypePlugin()
        ->label(),
    ];
    $items = array_map([
      State::class,
      'labelCallback',
    ], $entity->getTypePlugin()
      ->getStates());
    $row['states']['data'] = [
      '#theme' => 'item_list',
      '#context' => [
        'list_style' => 'comma-list',
      ],
      '#items' => $items,
    ];
    return $row + parent::buildRow($entity);
  }
  
  /**
   * {@inheritdoc}
   */
  public function render() {
    $build = parent::render();
    $workflow_types_count = count($this->workflowTypeManager
      ->getDefinitions());
    if ($workflow_types_count === 0) {
      $build['table']['#empty'] = $this->t('There are no workflow types available. In order to create workflows you need to install a module that provides a workflow type. For example, the <a href=":content-moderation">Content Moderation</a> module provides a workflow type that enables workflows for content entities.', [
        ':content-moderation' => Url::fromRoute('system.modules_list', [], [
          'fragment' => 'module-content-moderation',
        ])->toString(),
      ]);
    }
    return $build;
  }

}