class views_handler_area

class views_handler_area extends views_handler {

  /**
   * {@inheritdoc}
   */
  public function init(&$view, &$options) {
    parent::init($view, $options);

    // Make sure that no result area handlers are set to be shown when the
    // result is empty.
    if ($this->handler_type == 'empty') {
      $this->options['empty'] = TRUE;
    }
  }

  /**
   * {@inheritdoc}
   */
  public function label() {
    if (!isset($this->options['label'])) {
      return $this
        ->ui_name();
    }
    return $this->options['label'];
  }

  /**
   * {@inheritdoc}
   */
  public function option_definition() {
    $options = parent::option_definition();
    $this->definition['field'] = !empty($this->definition['field']) ? $this->definition['field'] : '';
    $label = !empty($this->definition['label']) ? $this->definition['label'] : $this->definition['field'];
    $options['label'] = array(
      'default' => $label,
      'translatable' => TRUE,
    );
    $options['empty'] = array(
      'default' => FALSE,
      'bool' => TRUE,
    );
    return $options;
  }

  /**
   * Provide extra data to the administration form.
   */
  public function admin_summary() {
    return $this
      ->label();
  }

  /**
   * Default options form that provides the label widget that all fields should
   * have.
   */
  public function options_form(&$form, &$form_state) {
    parent::options_form($form, $form_state);
    $form['label'] = array(
      '#type' => 'textfield',
      '#title' => t('Label'),
      '#default_value' => isset($this->options['label']) ? $this->options['label'] : '',
      '#description' => t('The label for this area that will be displayed only administratively.'),
    );
    if ($form_state['type'] != 'empty') {
      $form['empty'] = array(
        '#type' => 'checkbox',
        '#title' => t('Display even if view has no result'),
        '#default_value' => isset($this->options['empty']) ? $this->options['empty'] : 0,
      );
    }
  }

  /**
   * Don't run a query.
   */
  public function query() {
  }

  /**
   * Render the area.
   */
  public function render($empty = FALSE) {
    return '';
  }

  /**
   * Area handlers shouldn't have groupby.
   */
  public function use_group_by() {
    return FALSE;
  }

}