entity_agree-2.0.x-dev/src/Plugin/entity_agree/AgreementHandler/EntityAgreementForm.php

<?php

namespace Drupal\entity_agree\Plugin\entity_agree\AgreementHandler;

use Drupal\Core\Form\FormStateInterface;
use Drupal\entity_agree\AgreementHandlerPluginBase;

/**
 * Plugin to display an agreement field as a form on the entity.
 *
 * @AgreementHandler(
 *   id = "entity_agree_entity_form",
 *   label = @Translation("Agreement form"),
 *   category = @Translation("Form"),
 * )
 */
class EntityAgreementForm extends AgreementHandlerPluginBase {

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return ['button_text' => 'Agree'];
  }

  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    $form['button_text'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Button text'),
      '#description' => $this->t("This text will appear on the button displayed on the agreement. Don't forget to set the agreement field into the entity view display."),
      '#maxlength' => 32,
      '#default_value' => $this->configuration['button_text'],
      '#required' => TRUE,
    ];

    return parent::buildConfigurationForm($form, $form_state);
  }

}