materio-base-d7/sites/all/modules/contrib/form/webform/views/webform_handler_filter_is_draft.inc

<?php

/**
 * Views handler to filter submissions by draft state.
 *
 * Filter by submission status.
 */
class webform_handler_filter_is_draft extends views_handler_filter_in_operator {

  /**
   *
   */
  public function get_value_options() {
    if (!isset($this->value_options)) {
      $this->value_title = t('Status');
      $options = array('0' => t('Completed'), '1' => t('Draft'));
      $this->value_options = $options;
    }
  }

  /**
   * '0' won't work as a key for checkboxes.
   */
  public function value_form(&$form, &$form_state) {
    parent::value_form($form, $form_state);
    $form['value']['#type'] = 'select';
  }

}