class views_handler_field_counter

class views_handler_field_counter extends views_handler_field {
    
    /**
     * {@inheritdoc}
     */
    public function option_definition() {
        $options = parent::option_definition();
        $options['counter_start'] = array(
            'default' => 1,
        );
        $options['reverse'] = array(
            'default' => FALSE,
        );
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function options_form(&$form, &$form_state) {
        $form['counter_start'] = array(
            '#type' => 'textfield',
            '#title' => t('Starting value'),
            '#default_value' => $this->options['counter_start'],
            '#description' => t('Specify the number the counter should start at.'),
            '#size' => 2,
        );
        $form['reverse'] = array(
            '#type' => 'checkbox',
            '#title' => t('Reverse'),
            '#default_value' => $this->options['reverse'],
            '#description' => t('Reverse the counter.'),
        );
        parent::options_form($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        // Do nothing -- to override the parent query.
    }
    
    /**
     * {@inheritdoc}
     */
    public function render($values) {
        $reverse = empty($this->options['reverse']) ? 1 : -1;
        // Note: 1 is subtracted from the counter start value below because the
        // counter value is incremented by 1 at the end of this function.
        $counter_start = is_numeric($this->options['counter_start']) ? $this->options['counter_start'] : 0;
        $count = $reverse == -1 ? count($this->view->result) + $counter_start : $counter_start - 1;
        $pager = $this->view->query->pager;
        // Get the base count of the pager.
        if ($pager->use_pager()) {
            if ($reverse == -1) {
                $count = $pager->total_items + $counter_start - $pager->get_current_page() * $pager->get_items_per_page() + $pager->get_offset();
            }
            else {
                $count += ($pager->get_items_per_page() * $pager->get_current_page() + $pager->get_offset()) * $reverse;
            }
        }
        // Add the counter for the current site.
        $count += ($this->view->row_index + 1) * $reverse;
        return $count;
    }

}