NodeTypeForm::form

public NodeTypeForm::form(array $form, FormStateInterface $form_state)

public function form(array $form, FormStateInterface $form_state) {
  $form = parent::form($form, $form_state);

  $type = $this->entity;
  if ($this->operation == 'add') {
    $form['#title'] = $this->t('Add content type');
    $fields = $this->entityManager->getBaseFieldDefinitions('node');
    // Create a node with a fake bundle using the type's UUID so that we can
    // get the default values for workflow settings.
    // @todo Make it possible to get default values without an entity.
    //   https://www.drupal.org/node/2318187
    $node = $this->entityManager->getStorage('node')->create(array('type' => $type->uuid()));
  }
  else {
    $form['#title'] = $this->t('Edit %label content type', array('%label' => $type->label()));
    $fields = $this->entityManager->getFieldDefinitions('node', $type->id());
    // Create a node to get the current values for workflow settings fields.
    $node = $this->entityManager->getStorage('node')->create(array('type' => $type->id()));
  }

  $form['name'] = array(
    '#title' => t('Name'),
    '#type' => 'textfield',
    '#default_value' => $type->label(),
    '#description' => t('The human-readable name of this content type. This text will be displayed as part of the list on the <em>Add content</em> page. This name must be unique.'),
    '#required' => TRUE,
    '#size' => 30,
  );

  $form['type'] = array(
    '#type' => 'machine_name',
    '#default_value' => $type->id(),
    '#maxlength' => EntityTypeInterface::BUNDLE_MAX_LENGTH,
    '#disabled' => $type->isLocked(),
    '#machine_name' => array(
      'exists' => ['Drupal\node\Entity\NodeType', 'load'],
      'source' => array('name'),
    ),
    '#description' => t('A unique machine-readable name for this content type. It must only contain lowercase letters, numbers, and underscores. This name will be used for constructing the URL of the %node-add page, in which underscores will be converted into hyphens.', array(
      '%node-add' => t('Add content'),
    )),
  );

  $form['description'] = array(
    '#title' => t('Description'),
    '#type' => 'textarea',
    '#default_value' => $type->getDescription(),
    '#description' => t('This text will be displayed on the <em>Add new content</em> page.'),
  );

  $form['additional_settings'] = array(
    '#type' => 'vertical_tabs',
    '#attached' => array(
      'library' => array('node/drupal.content_types'),
    ),
  );

  $form['submission'] = array(
    '#type' => 'details',
    '#title' => t('Submission form settings'),
    '#group' => 'additional_settings',
    '#open' => TRUE,
  );
  $form['submission']['title_label'] = array(
    '#title' => t('Title field label'),
    '#type' => 'textfield',
    '#default_value' => $fields['title']->getLabel(),
    '#required' => TRUE,
  );
  $form['submission']['preview_mode'] = array(
    '#type' => 'radios',
    '#title' => t('Preview before submitting'),
    '#default_value' => $type->getPreviewMode(),
    '#options' => array(
      DRUPAL_DISABLED => t('Disabled'),
      DRUPAL_OPTIONAL => t('Optional'),
      DRUPAL_REQUIRED => t('Required'),
    ),
  );
  $form['submission']['help'] = array(
    '#type' => 'textarea',
    '#title' => t('Explanation or submission guidelines'),
    '#default_value' => $type->getHelp(),
    '#description' => t('This text will be displayed at the top of the page when creating or editing content of this type.'),
  );
  $form['workflow'] = array(
    '#type' => 'details',
    '#title' => t('Publishing options'),
    '#group' => 'additional_settings',
  );
  $workflow_options = array(
    'status' => $node->status->value,
    'promote' => $node->promote->value,
    'sticky' => $node->sticky->value,
    'revision' => $type->isNewRevision(),
  );
  // Prepare workflow options to be used for 'checkboxes' form element.
  $keys = array_keys(array_filter($workflow_options));
  $workflow_options = array_combine($keys, $keys);
  $form['workflow']['options'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Default options'),
    '#default_value' => $workflow_options,
    '#options' => array(
      'status' => t('Published'),
      'promote' => t('Promoted to front page'),
      'sticky' => t('Sticky at top of lists'),
      'revision' => t('Create new revision'),
    ),
    '#description' => t('Users with the <em>Administer content</em> permission will be able to override these options.'),
  );
  if ($this->moduleHandler->moduleExists('language')) {
    $form['language'] = array(
      '#type' => 'details',
      '#title' => t('Language settings'),
      '#group' => 'additional_settings',
    );

    $language_configuration = ContentLanguageSettings::loadByEntityTypeBundle('node', $type->id());
    $form['language']['language_configuration'] = array(
      '#type' => 'language_configuration',
      '#entity_information' => array(
        'entity_type' => 'node',
        'bundle' => $type->id(),
      ),
      '#default_value' => $language_configuration,
    );
  }
  $form['display'] = array(
    '#type' => 'details',
    '#title' => t('Display settings'),
    '#group' => 'additional_settings',
  );
  $form['display']['display_submitted'] = array(
    '#type' => 'checkbox',
    '#title' => t('Display author and date information'),
    '#default_value' => $type->displaySubmitted(),
    '#description' => t('Author username and publish date will be displayed.'),
  );

  return $this->protectBundleIdElement($form);
}