vp-1.0.x-dev/modules/vp_analytics/src/Form/VpAnalyticsSettingsForm.php

<?php

namespace Drupal\vp_analytics\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * Configuration form for a vp analytics entity type.
 */
class VpAnalyticsSettingsForm extends FormBase {

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

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {

    $form['settings'] = [
      '#markup' => $this->t('Settings form for a vp analytics entity type.'),
    ];

    $form['actions'] = [
      '#type' => 'actions',
    ];

    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Save'),
    ];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $this->messenger()->addStatus($this->t('The configuration has been updated.'));
  }

}