我正在尝试在Flutter中创建一个基本的聊天应用程序,我想将对话显示在简单的容器中,以使其长度适合于内部文本。当出现溢出错误时,一切工作正常,直到文本不适合容器的长度为止。
我正在使用的代码就是这个
Widget _buildMessage(Message message) {
return Row(children: <Widget>[
message.author == username ? Expanded(child: Container()) : Container(),
Container(
padding: EdgeInsets.all(8.0),
margin: EdgeInsets.all(4.0),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(8.0))),
child: Row(
children: <Widget>[
Text(
message.text,
),
SizedBox(
width: 8.0,
),
Padding(
padding: EdgeInsets.only(top: 6.0),
child: Text(
message.time,
style: TextStyle(fontSize: 10.0, color: Colors.grey),
),
),
SizedBox(
width: 8.0,
),
Padding(
padding: EdgeInsets.only(top: 6.0),
child: Text(
message.author,
style: TextStyle(fontSize: 10.0, color: Colors.grey),
),
),
],
)),
message.author != username ? Expanded(child: Container()) : Container(),
]);
}
我正在使用“行中的行”,以便根据作者的不同将其对齐。 如果在输入中键入带有多行的内容,则文本将正确呈现,容器将根据需要垂直扩展。问题是当我键入的内容超出容器的宽度时。
我可以通过以下方式解决此问题:将“文本”与“容器”一起包装,然后用“ fixed”包装,但是我不希望这样,因为我希望宽度是动态的并适应文本。
我还看到了其他一些人们建议使用“灵活”或“扩展”的问题,但是我不知道该怎么做。
任何想法都会受到赞赏。
答案 0 :(得分:2)
我试图编辑您的代码,这就是我所做的:
return Row(
mainAxisAlignment: message.author == username ? MainAxisAlignment.end : MainAxisAlignment.start,
//this will determine if the message should be displayed left or right
children: [
Flexible(
//Wrapping the container with flexible widget
child: Container(
padding: EdgeInsets.all(8.0),
margin: EdgeInsets.all(4.0),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(8.0))),
child: Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Flexible(
//We only want to wrap the text message with flexible widget
child: Container(
child: Text(
message.text,
)
)
),
SizedBox(
width: 8.0,
),
Padding(
padding: EdgeInsets.only(top: 6.0),
child: Text(
message.time,
style: TextStyle(fontSize: 10.0, color: Colors.grey),
),
),
SizedBox(
width: 8.0,
),
Padding(
padding: EdgeInsets.only(top: 6.0),
child: Text(
message.author,
style: TextStyle(fontSize: 10.0, color: Colors.grey),
),
),
],
)),
)
]
);
这是我的伪代码的完整版本:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
List<String> username = ['foo', 'bar', 'foo', 'bar', 'foo'];
List<String> messages = ['aaaaaaaaaaaaaaaaaaaaaaaaaaaaa', 'bb', 'cccccccccccccccccccccccccccccc', 'dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd', 'ee'];
List<String> time = ['131', '6454', '54564', '54546', '88888'];
List<String> author = ['Jesus', 'Joseph', 'Mary', 'John', 'Cardo'];
@override
Widget build(BuildContext context){
return Scaffold(
body: Container(
color: Colors.blue[200],
child: ListView.builder(
itemCount: 5,
itemBuilder: (_, int index){
return Row(
mainAxisAlignment: username[index] == "foo" ? MainAxisAlignment.end : MainAxisAlignment.start,
children: [
Flexible(
child: Container(
padding: EdgeInsets.all(8.0),
margin: EdgeInsets.all(4.0),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(8.0))),
child: Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Flexible(
child: Container(
child: Text(
messages[index],
),
)
),
SizedBox(
width: 8.0,
),
Padding(
padding: EdgeInsets.only(top: 6.0),
child: Text(
time[index],
style: TextStyle(fontSize: 10.0, color: Colors.grey),
),
),
SizedBox(
width: 8.0,
),
Padding(
padding: EdgeInsets.only(top: 6.0),
child: Text(
author[index],
style: TextStyle(fontSize: 10.0, color: Colors.grey),
),
),
],
)),
)
]
);
}
)
)
);
}
}