protected function getInfoWindowOptions()
    {
        if (isset(Yii::$app->params['infoWindowOptions']) && empty($this->infoWindowOptions)) {
            $this->infoWindowOptions = Yii::$app->params['infoWindowOptions'];
        }

        return ArrayHelper::merge([
            'content' => '',
            'maxWidth' => 350,
        ], $this->infoWindowOptions);
    }