Drupal list all node types and view mode

node_types_view_mode.php

<?php
  $node_types = array();
  foreach (node_type_get_types() as $type => $item) {
    $node_types[$type] = $item->name;
  }

  $form['type'] = array(
    '#type'          => 'select',
    '#title'         => t('Content Type'),
    '#options'       => $node_types,
    '#default_value' => $conf['type'],
    '#description'   => t('Select content type'),
  );
  $view_modes = array();
  $entity_info = entity_get_info('node');
  foreach ($entity_info['view modes'] as $key => $item) {
    $view_modes[$key] = $item['label'];
  };

  $form['view_mode'] = array(
    '#type'          => 'select',
    '#title'         => t('View Mode'),
    '#options'       => $view_modes,
    '#default_value' => $conf['view_mode'],
    '#description'   => t('Select display view mode'),
  );