easy_social-8.x-3.x-dev/contrib/easy_social_example/src/Form/SettingsForm.php

<?php

namespace Drupal\easy_social_example\Form;

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

/**
 * Configure user settings for this site.
 */
final class SettingsForm extends ConfigFormBase {

  /**
   * Config settings.
   *
   * @var string
   */
  private const SETTINGS = 'easy_social.example';

  /**
   * {@inheritdoc}
   */
  protected function getEditableConfigNames(): array {
    return [self::SETTINGS];
  }

  /**
   * {@inheritdoc}
   */
  public function getFormId(): string {
    return 'easy_social_example_settings';
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state): array {
    $config = $this->configFactory->get(self::SETTINGS);

    $form['help'] = [
      '#markup' => t('For more information, please check out the official @example share widget <a href="@url" target="_blank">documentation</a>', ['@example' => t('Example'), '@url' => '#']),
      '#weight' => -99,
    ];

    $form['size'] = [
      '#type' => 'checkbox',
      '#title' => t('Large button'),
      '#default_value' => $config->get('size'),
    ];

    $form['foo'] = [
      '#type' => 'textfield',
      '#title' => t('Foo'),
      '#default_value' => $config->get('foo'),
    ];

    $form['baz'] = [
      '#type' => 'checkbox',
      '#title' => t('Baz'),
      '#default_value' => $config->get('baz'),
    ];

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

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

    $this->configFactory->get(self::SETTINGS)
      ->set('size', $form_state['values']['size'])
      ->set('foo', $form_state['values']['foo'])
      ->set('baz', $form_state['values']['baz'])
      ->save();
  }

}