我正在尝试实现浮动Snackbar的动画，它从屏幕底部出现并向上移动，就像在Gmail应用程序中滑动邮件以获取成功时出现的动画一样。有人能举个例子吗？

ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                          content: Text(
                            'Product removed from cart',
                          ),
                          action: SnackBarAction(
                              label: 'Undo',
                              onPressed: () {
                               //
                              }),
                          duration: Duration(seconds: 3),
                          behavior: SnackBarBehavior.floating,
                          margin: EdgeInsets.only(bottom: 30,left: 10,right: 10),
                          animation: // **Answer Please**
                      }