NegotiationConfigureForm::submitForm

public NegotiationConfigureForm::submitForm(array &$form, FormStateInterface $form_state)

public function submitForm(array &$form, FormStateInterface $form_state) {
  $configurable_types = $form['#language_types'];

  $stored_values = $this->languageTypes->get('configurable');
  $customized = array();
  $method_weights_type = array();

  foreach ($configurable_types as $type) {
    $customized[$type] = in_array($type, $stored_values);
    $method_weights = array();
    $enabled_methods = $form_state->getValue(array($type, 'enabled'));
    $enabled_methods[LanguageNegotiationSelected::METHOD_ID] = TRUE;
    $method_weights_input = $form_state->getValue(array($type, 'weight'));
    if ($form_state->hasValue(array($type, 'configurable'))) {
      $customized[$type] = !$form_state->isValueEmpty(array($type, 'configurable'));
    }

    foreach ($method_weights_input as $method_id => $weight) {
      if ($enabled_methods[$method_id]) {
        $method_weights[$method_id] = $weight;
      }
    }

    $method_weights_type[$type] = $method_weights;
    $this->languageTypes->set('negotiation.' . $type . '.method_weights', $method_weights_input)->save();
  }

  // Update non-configurable language types and the related language
  // negotiation configuration.
  $this->negotiator->updateConfiguration(array_keys(array_filter($customized)));

  // Update the language negotiations after setting the configurability.
  foreach ($method_weights_type as $type => $method_weights) {
    $this->negotiator->saveConfiguration($type, $method_weights);
  }

  // Clear block definitions cache since the available blocks and their names
  // may have been changed based on the configurable types.
  if ($this->blockStorage) {
    // If there is an active language switcher for a language type that has
    // been made not configurable, deactivate it first.
    $non_configurable = array_keys(array_diff($customized, array_filter($customized)));
    $this->disableLanguageSwitcher($non_configurable);
  }
  $this->blockManager->clearCachedDefinitions();

  $form_state->setRedirect('language.negotiation');
  drupal_set_message($this->t('Language detection configuration saved.'));
}