protected function clearCacheImageStyle()
    {
        $this->controlToken('clear');
        $style_id = $this->getQuery('clear');

        if (!empty($style_id)) {

            if ($this->image_style->clearCache($style_id)) {
                $this->redirect('', $this->text('Cache has been deleted'), 'success');
            }

            $this->redirect('', $this->text('Cache has not been deleted'), 'warning');
        }
    }