class LayoutAccessNegatable

layout_autoload_info in core/modules/layout/layout.module

Implements hook_autoload_info().

class LayoutAccessNegatable extends LayoutAccess {
  function __construct($plugin_name, array $data = array()) {
    parent::__construct($plugin_name, $data);
    // Ensure a setting always exists for negation.
    $this->settings += array(
      'negate' => FALSE,
    );
  }

  /**
   * {@inheritdoc}
   */
  function form(&$form, &$form_state) {
    parent::form($form, $form_state);
    $form['negate'] = array(
      '#type' => 'checkbox',
      '#title' => t('Reverse (NOT)'),
      '#weight' => 100,
      '#default_value' => $this->settings['negate'],
    );
  }

  /**
   * {@inheritdoc}
   */
  function formSubmit($form, &$form_state) {
    parent::formSubmit($form, $form_state);
    $this->settings['negate'] = !empty($form_state['values']['negate']);
  }
}