class NumberListField

class NumberListField extends NumericArgument {
  use FieldAPIHandlerTrait;
  
  /**
   * Stores the allowed values of this field.
   *
   * @var array
   */
  protected $allowedValues = NULL;
  
  /**
   * {@inheritdoc}
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);
    $field_storage = $this->getFieldStorageDefinition();
    $this->allowedValues = options_allowed_values($field_storage);
  }
  
  /**
   * {@inheritdoc}
   */
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['summary']['contains']['human'] = [
      'default' => FALSE,
    ];
    return $options;
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    parent::buildOptionsForm($form, $form_state);
    $form['summary']['human'] = [
      '#title' => $this->t('Display list value as human readable'),
      '#type' => 'checkbox',
      '#default_value' => $this->options['summary']['human'],
      '#states' => [
        'visible' => [
          ':input[name="options[default_action]"]' => [
            'value' => 'summary',
          ],
        ],
      ],
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function summaryName($data) {
    $value = $data->{$this->name_alias};
    // If the list element has a human readable name show it.
    if (isset($this->allowedValues[$value]) && !empty($this->options['summary']['human'])) {
      return FieldFilteredMarkup::create($this->allowedValues[$value]);
    }
    else {
      return $value;
    }
  }

}