Contao\StyleSheets::updateStyleSheet PHP Method

    public function updateStyleSheet($intId)
    {
        $objStyleSheet = $this->Database->prepare("SELECT * FROM tl_style_sheet WHERE id=?")->limit(1)->execute($intId);
        if ($objStyleSheet->numRows < 1) {
            return;
        }
        // Delete the CSS file
        if (\Input::get('act') == 'delete') {
            $this->import('Files');
            $this->Files->delete('assets/css/' . $objStyleSheet->name . '.css');
        } else {
            $this->writeStyleSheet($objStyleSheet->row());
            $this->log('Generated style sheet "' . $objStyleSheet->name . '.css"', __METHOD__, TL_CRON);
        }
    }