class StringListField

class StringListField extends StringArgument {
    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'])) {
            $value = $this->allowedValues[$value];
        }
        return FieldFilteredMarkup::create($this->caseTransform($value, $this->options['case']));
    }

}