closedquestion-8.x-3.x-dev/src/Form/QuestionForm.php

<?php

namespace Drupal\closedquestion\Form;

use Drupal\closedquestion\Entity\ClosedQuestionInterface;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;

/**
 * Class QuestionForm.
 *
 * @package Drupal\closedquestion\Form
 */
class QuestionForm extends FormBase {

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

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state, ClosedQuestionInterface $closedQuestion = NULL) {
    $form_state->getStorage()['closedquestion'] = $closedQuestion;

    // Disable form cache because stored entity cannot be serialized.
    $form_state->disableCache();
    $form['#cache'] = ['max-age' => 0];

    if (isset($closedQuestion->question) && $closedQuestion->question) {
      $form = $closedQuestion->question->getForm($form_state);
      if (!isset($closedQuestion->noReset)) {
        $form['reset'] = array(
          '#type' => 'submit',
          '#value' => 'Reset',
        );
      }
      $form['#attached']['library'][] = 'closedquestion/closedquestion.core';
    }

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    /** @var \Drupal\closedquestion\Entity\ClosedQuestionInterface $closedquestion */
    $closedquestion = $form_state->getStorage()['closedquestion'];

    /** @var \Drupal\closedquestion\Question\CqQuestionInterface $question */
    $question = $closedquestion->question;
    if ($form_state->getTriggeringElement()['#value'] == $form_state->getValue('reset') && !isset($closedquestion->noReset)) {
      $question->reset();
      \Drupal::messenger()->addMessage(t('Answer Reset.'));
      $url = URL::fromRoute('<current>');
      $form_state->setRedirectUrl($url);
      \Drupal::moduleHandler()->invokeAll('closedquestion_reset', [$question]);
    }
    else {
      $question->submitAnswer($form, $form_state);
      $form_state->setRebuild();
    }
  }

}