Method error

Demo/Notification.py:234–242

(cls, title, message, callback=None)

    @classmethod
    def error(cls, title, message, callback=None):
        cls._createInstance()
        item = QListWidgetItem(cls._instance)
        w = NotificationItem(title, message, item,
                             ntype=NotificationIcon.Error, callback=callback)
        w.closed.connect(cls._instance.removeItem)
        width = cls._instance.width() - cls._instance.spacing()
        item.setSizeHint(QSize(width, w.height()))
        cls._instance.setItemWidget(item, w)


if __name__ == '__main__':