class ActionListBuilder

class ActionListBuilder extends ConfigEntityListBuilder {
    
    /**
     * @var bool
     */
    protected $hasConfigurableActions = FALSE;
    
    /**
     * The action plugin manager.
     *
     * @var \Drupal\Core\Action\ActionManager
     */
    protected $actionManager;
    
    /**
     * Constructs a new ActionListBuilder object.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param \Drupal\Core\Entity\EntityStorageInterface $storage
     *   The action storage.
     * @param \Drupal\Core\Action\ActionManager $action_manager
     *   The action plugin manager.
     */
    public function __construct(EntityTypeInterface $entity_type, EntityStorageInterface $storage, ActionManager $action_manager) {
        parent::__construct($entity_type, $storage);
        $this->actionManager = $action_manager;
    }
    
    /**
     * {@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.action'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function load() {
        $entities = parent::load();
        foreach ($entities as $entity) {
            if ($entity->isConfigurable()) {
                $this->hasConfigurableActions = TRUE;
                break;
            }
        }
        return $entities;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        $row['type'] = $entity->getType();
        $row['label'] = $entity->label();
        if ($this->hasConfigurableActions) {
            $row += parent::buildRow($entity);
        }
        return $row;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header = [
            'type' => t('Action type'),
            'label' => t('Label'),
        ] + parent::buildHeader();
        return $header;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultOperations(EntityInterface $entity) {
        $operations = $entity->isConfigurable() ? parent::getDefaultOperations($entity) : [];
        if (isset($operations['edit'])) {
            $operations['edit']['title'] = t('Configure');
        }
        return $operations;
    }
    
    /**
     * {@inheritdoc}
     */
    public function render() {
        $build['action_admin_manage_form'] = \Drupal::formBuilder()->getForm('Drupal\\action\\Form\\ActionAdminManageForm');
        $build['action_header']['#markup'] = '<h3>' . $this->t('Available actions:') . '</h3>';
        $build['action_table'] = parent::render();
        if (!$this->hasConfigurableActions) {
            unset($build['action_table']['table']['#header']['operations']);
        }
        return $build;
    }

}