ConfigTranslationFormBase::buildForm

public ConfigTranslationFormBase::buildForm(array $form, FormStateInterface $form_state, RouteMatchInterface $route_match = NULL, $plugin_id = NULL, $langcode = NULL)

public function buildForm(array $form, FormStateInterface $form_state, RouteMatchInterface $route_match = NULL, $plugin_id = NULL, $langcode = NULL) {
  /** @var \Drupal\config_translation\ConfigMapperInterface $mapper */
  $mapper = $this->configMapperManager->createInstance($plugin_id);
  $mapper->populateFromRouteMatch($route_match);

  $language = $this->languageManager->getLanguage($langcode);
  if (!$language) {
    throw new NotFoundHttpException();
  }

  $this->mapper = $mapper;
  $this->language = $language;

  // ConfigTranslationFormAccess will not grant access if this raises an
  // exception, so we can call this without a try-catch block here.
  $langcode = $this->mapper->getLangcode();

  $this->sourceLanguage = $this->languageManager->getLanguage($langcode);

  // Get base language configuration to display in the form before setting the
  // language to use for the form. This avoids repetitively settings and
  // resetting the language to get original values later.
  $this->baseConfigData = $this->mapper->getConfigData();

  // Set the translation target language on the configuration factory.
  $original_language = $this->languageManager->getConfigOverrideLanguage();
  $this->languageManager->setConfigOverrideLanguage($this->language);

  // Add some information to the form state for easier form altering.
  $form_state->set('config_translation_mapper', $this->mapper);
  $form_state->set('config_translation_language', $this->language);
  $form_state->set('config_translation_source_language', $this->sourceLanguage);

  $form['#attached']['library'][] = 'config_translation/drupal.config_translation.admin';

  // Even though this is a nested form, we do not set #tree to TRUE because
  // the form value structure is generated by using #parents for each element.
  // @see \Drupal\config_translation\FormElement\FormElementBase::getElements()
  $form['config_names'] = array('#type' => 'container');
  foreach ($this->mapper->getConfigNames() as $name) {
    $form['config_names'][$name] = array('#type' => 'container');

    $schema = $this->typedConfigManager->get($name);
    $source_config = $this->baseConfigData[$name];
    $translation_config = $this->configFactory()->get($name)->get();

    if ($form_element = $this->createFormElement($schema)) {
      $parents = array('config_names', $name);
      $form['config_names'][$name] += $form_element->getTranslationBuild($this->sourceLanguage, $this->language, $source_config, $translation_config, $parents);
    }
  }

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

  // Set the configuration language back.
  $this->languageManager->setConfigOverrideLanguage($original_language);

  return $form;
}