Dart 如何使websocket响应显示在与发送的消息相同的小部件中,如适当的聊天屏幕
我是一个新手,到目前为止我已经爱上了它 我需要一种方法将来自web套接字服务器的响应放在左侧;就像一个合适的聊天屏幕Dart 如何使websocket响应显示在与发送的消息相同的小部件中,如适当的聊天屏幕,dart,flutter,Dart,Flutter,我是一个新手,到目前为止我已经爱上了它 我需要一种方法将来自web套接字服务器的响应放在左侧;就像一个合适的聊天屏幕 WebSocketChannel channel; final List<String> list = []; final List<ChatMessageListItem> _messages = <ChatMessageListItem>[]; TextEditingController _textController;
WebSocketChannel channel;
final List<String> list = [];
final List<ChatMessageListItem> _messages = <ChatMessageListItem>[];
TextEditingController _textController;
bool _isComposing = false;
@override
void initState() {
super.initState();
channel = IOWebSocketChannel.connect('ws://echo.websocket.org');
_textController = TextEditingController();
channel.stream.listen((receivedMessage){
setState(() {
list.add(receivedMessage);
});
});
}
//用于显示已发送消息的小部件
new Flexible(
child: new ListView.builder(
padding: new EdgeInsets.all(8.0),
reverse: true,
itemBuilder: (_, int index) => _messages[index],
itemCount: _messages.length,
),
)
目前,我只能使用下面的地图显示收到的消息
new Flexible(
child: Column(
children: list.map((receivedMessage) => Text(receivedMessage)).toList(),
),
),
请,我需要一种方法使它显示在ListView生成器中
与其为发送和接收的消息保留两个单独的列表,为什么不为这两个消息都保留一个ChatMessageListItem列表呢?您可以使用一个名为type:sent或received的属性来区分它们,因此您可以确定在ListView的左侧或右侧显示不同的颜色等。当收到一条receivedMessage时,将其添加到列表中。现在,ListView可以处理这两种类型的消息
WebSocketChannel channel;
//final List<String> list = []; //Remove this line
final List<ChatMessageListItem> _messages = <ChatMessageListItem>[];
TextEditingController _textController;
bool _isComposing = false;
@override
void initState() {
super.initState();
channel = IOWebSocketChannel.connect('ws://echo.websocket.org');
_textController = TextEditingController();
channel.stream.listen((receivedMessage){
setState(() {
_messages.insert(0, new ChatMessageListItem(message: receivedMessage, type: MessageType.received));
//list.add(receivedMessage);
});
});
}
WebSocketChannel频道;
//最终名单=[]//删除此行
最终列表_消息=[];
TextEditingController\u textController;
bool _isComposing=false;
@凌驾
void initState(){
super.initState();
channel=IOWebSocketChannel.connect('ws://echo.websocket.org');
_textController=TextEditingController();
channel.stream.listen((接收消息){
设置状态(){
_插入(0,新的ChatMessageListItem(消息:receivedMessage,类型:MessageType.received));
//list.add(receivedMessage);
});
});
}
谢谢;正是我需要的。
WebSocketChannel channel;
//final List<String> list = []; //Remove this line
final List<ChatMessageListItem> _messages = <ChatMessageListItem>[];
TextEditingController _textController;
bool _isComposing = false;
@override
void initState() {
super.initState();
channel = IOWebSocketChannel.connect('ws://echo.websocket.org');
_textController = TextEditingController();
channel.stream.listen((receivedMessage){
setState(() {
_messages.insert(0, new ChatMessageListItem(message: receivedMessage, type: MessageType.received));
//list.add(receivedMessage);
});
});
}