ActionAdminManageForm.php

<?php

namespace Drupal\action\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Action\ActionManager;
use Drupal\Core\Form\FormStateInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a configuration form for configurable actions.
 *
 * @internal
 */
class ActionAdminManageForm extends FormBase {
  
  /**
   * The action plugin manager.
   *
   * @var \Drupal\Core\Action\ActionManager
   */
  protected $manager;
  
  /**
   * Constructs a new ActionAdminManageForm.
   *
   * @param \Drupal\Core\Action\ActionManager $manager
   *   The action plugin manager.
   */
  public function __construct(ActionManager $manager) {
    $this->manager = $manager;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('plugin.manager.action'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'action_admin_manage';
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $actions = [];
    foreach ($this->manager
      ->getDefinitions() as $id => $definition) {
      $actions[$id] = $definition['label'];
    }
    asort($actions);
    $form['parent'] = [
      '#type' => 'details',
      '#title' => $this->t('Create an advanced action'),
      '#attributes' => [
        'class' => [
          'container-inline',
        ],
      ],
      '#open' => TRUE,
    ];
    $form['parent']['action'] = [
      '#type' => 'select',
      '#title' => $this->t('Action'),
      '#title_display' => 'invisible',
      '#options' => $actions,
      '#empty_option' => $this->t('- Select -'),
    ];
    $form['parent']['actions'] = [
      '#type' => 'actions',
    ];
    $form['parent']['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Create'),
    ];
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    if ($form_state->getValue('action')) {
      $form_state->setRedirect('action.admin_add', [
        'action_id' => $form_state->getValue('action'),
      ]);
    }
  }

}