argue-2.0.0-alpha4/modules/argue_versions/src/Form/ArgueVersionsSettingsForm.php

<?php

namespace Drupal\argue_versions\Form;

use Drupal\Core\Form\ConfigFormBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * Class ArgueVersionsSettingsForm.
 */
class ArgueVersionsSettingsForm extends ConfigFormBase {

  /**
   * {@inheritdoc}
   */
  protected function getEditableConfigNames() {
    return [
      'argue_versions.settings',
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'argue_versions_settings';
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $config = $this->config('argue_versions.settings');
    $form['description'] = [
      '#type' => 'text_format',
      '#title' => $this->t('Description'),
      '#description' => $this->t('Enter the description displayed on top of the version overview page.'),
      '#default_value' => $config->get('description'),
    ];
    return parent::buildForm($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    parent::submitForm($form, $form_state);

    $this->config('argue_versions.settings')
      ->set('description', $form_state->getValue('description')['value'])
      ->save();
  }

}