// import 'package:flutter/material.dart';

// class InformationPage extends StatefulWidget {
//   InformationPage({Key? key}) : super(key: key);

//   @override
//   State<InformationPage> createState() => _InformationPageState();
// }

// class _InformationPageState extends State<InformationPage> {
//   @override
//   Widget build(BuildContext context) {
//     return Container(
//       child: Text('aa'),
//     );
//   }
// }

import 'package:flutter/material.dart';
import 'package:web_socket_channel/io.dart';

class InformationPage extends StatefulWidget {
  InformationPage({Key? key}) : super(key: key);

  @override
  _InformationPageState createState() => _InformationPageState();
}

class _InformationPageState extends State<InformationPage> {
  TextEditingController _controller = TextEditingController();
  late IOWebSocketChannel channel;
  String _text = "";

  @override
  void initState() {
    // 创建websocket连接
    channel = IOWebSocketChannel.connect(
        'ws://101.35.117.69:9093/chat/api/chat/room/${1}');
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("发现页面 WebSocket"),
      ),
      body: Padding(
        padding: const EdgeInsets.all(20.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            Container(
              child: TextField(
                controller: _controller,
                decoration: InputDecoration(labelText: '发送消息'),
              ),
            ),
            StreamBuilder(
              stream: channel.stream,
              builder: (context, snapshot) {
                // 网络不通会走到这
                if (snapshot.hasError) {
                  _text = "网络不通...";
                } else if (snapshot.hasData) {
                  _text = "echo: ${snapshot.data}";
                }
                return Padding(
                  padding: const EdgeInsets.symmetric(vertical: 24.0),
                  child: Text(_text),
                );
              },
            )
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _sendMessage,
        tooltip: 'Send message',
        child: Icon(Icons.send),
      ),
    );
  }

  void _sendMessage() {
    if (_controller.text.isNotEmpty) {
      channel.sink.add(_controller.text);
    }
  }

  @override
  void dispose() {
    channel.sink.close();
    super.dispose();
  }
}