[Flutter] Style a message chat style-ish bubble

const kOtherBubblePointer = BorderRadius.only(
  topRight: Radius.circular(30),
  bottomLeft: Radius.circular(30),
  bottomRight: Radius.circular(30),
);

const kMeBubblePointer = BorderRadius.only(
  topLeft: Radius.circular(30),
  bottomLeft: Radius.circular(30),
  bottomRight: Radius.circular(30),
);

class MessageBubble extends StatelessWidget {
  MessageBubble({this.sender, this.text, this.isMe});

  final String text;
  final String sender;
  final bool isMe;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: EdgeInsets.all(10.0),
      child: Column(
        crossAxisAlignment:
            isMe ? CrossAxisAlignment.end : CrossAxisAlignment.start,
        children: <Widget>[
          Text(
            sender,
            style: TextStyle(fontSize: 12, color: Colors.black45),
          ),
          Material(
            borderRadius: isMe ? kMeBubblePointer : kOtherBubblePointer,
            elevation: 5,
            color: isMe ? Colors.lightBlueAccent : Colors.white,
            child: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
              child: Text(
                '$text',
                style: TextStyle(
                  fontSize: 15.0,
                  color: isMe ? Colors.white : Colors.black54,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

来源：https://www.cnblogs.com/Answer1215/p/11870389.html