ActionAdminManageForm::buildForm

public ActionAdminManageForm::buildForm(array $form, FormStateInterface $form_state)

public function buildForm(array $form, FormStateInterface $form_state) {
  $actions = array();
  foreach ($this->manager->getDefinitions() as $id => $definition) {
    if (is_subclass_of($definition['class'], '\Drupal\Core\Plugin\PluginFormInterface')) {
      $key = Crypt::hashBase64($id);
      $actions[$key] = $definition['label'] . '...';
    }
  }
  $form['parent'] = array(
    '#type' => 'details',
    '#title' => $this->t('Create an advanced action'),
    '#attributes' => array('class' => array('container-inline')),
    '#open' => TRUE,
  );
  $form['parent']['action'] = array(
    '#type' => 'select',
    '#title' => $this->t('Action'),
    '#title_display' => 'invisible',
    '#options' => $actions,
    '#empty_option' => $this->t('Choose an advanced action'),
  );
  $form['parent']['actions'] = array(
    '#type' => 'actions'
  );
  $form['parent']['actions']['submit'] = array(
    '#type' => 'submit',
    '#value' => $this->t('Create'),
  );
  return $form;
}