Created
December 8, 2019 15:24
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Flutter App 39: Implement a message list
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import 'package:flutter/material.dart'; | |
const String _name = "YourName"; | |
void main() { | |
runApp(new FriendlychatApp()); | |
} | |
class FriendlychatApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return new MaterialApp( | |
title: "Friendlychat", | |
home: new ChatScreen(), | |
); | |
} | |
} | |
class ChatScreen extends StatefulWidget { | |
@override | |
State createState() => new ChatScreenState(); | |
} | |
class ChatMessage extends StatelessWidget { | |
ChatMessage({this.text}); | |
final String text; | |
@override | |
Widget build(BuildContext context) { | |
return new Container( | |
decoration: myBoxDecoration(), | |
margin: const EdgeInsets.symmetric(vertical: 10.0), | |
child: new Row( | |
crossAxisAlignment: CrossAxisAlignment.start, | |
children: <Widget>[ | |
new Container( | |
decoration: myBoxDecoration(), | |
margin: const EdgeInsets.only(right: 16.0), | |
child: new CircleAvatar(child: new Text(_name[0])), | |
), | |
new Column( | |
crossAxisAlignment: CrossAxisAlignment.start, | |
children: <Widget>[ | |
new Text(_name, style: Theme.of(context).textTheme.subhead), | |
new Container( | |
decoration: myBoxDecoration(), | |
margin: const EdgeInsets.only(top: 5.0), | |
child: new Text(text), | |
), | |
], | |
), | |
], | |
), | |
); | |
} | |
BoxDecoration myBoxDecoration() { | |
return BoxDecoration( | |
border: Border.all( | |
width: 3.0, | |
color: Colors.blue, | |
), | |
borderRadius: BorderRadius.all(Radius.circular(5.0)), | |
); | |
} | |
} | |
class ChatScreenState extends State<ChatScreen> { | |
final List<ChatMessage> _messages = <ChatMessage>[]; | |
final TextEditingController _textController = new TextEditingController(); | |
@override | |
Widget build(BuildContext context) { | |
return new Scaffold( | |
appBar: new AppBar(title: new Text("Friendlychat")), | |
body: new Column( | |
children: <Widget>[ | |
new Flexible( | |
child: new ListView.builder( | |
padding: new EdgeInsets.all(8.0), | |
reverse: true, | |
itemBuilder: (_, int index) => _messages[index], | |
itemCount: _messages.length, | |
), | |
), | |
new Divider(height: 1.0), | |
new Container( | |
decoration: myBoxDecoration(), | |
child: _buildTextComposer(), | |
), | |
], | |
), | |
); | |
} | |
Widget _buildTextComposer() { | |
return new Container( | |
decoration: myBoxDecoration(), | |
margin: const EdgeInsets.symmetric(horizontal: 8.0), | |
child: new Row( | |
children: <Widget>[ | |
new Flexible( | |
child: new TextField( | |
controller: _textController, | |
onSubmitted: _handleSubmitted, | |
decoration: | |
new InputDecoration.collapsed(hintText: "Send a message"), | |
), | |
), | |
new Container( | |
decoration: myBoxDecoration(), | |
margin: new EdgeInsets.symmetric(horizontal: 4.0), | |
child: new IconButton( | |
icon: new Icon(Icons.send), | |
onPressed: () => _handleSubmitted(_textController.text)), | |
), | |
], | |
), | |
); | |
} | |
void _handleSubmitted(String text) { | |
_textController.clear(); | |
ChatMessage message = new ChatMessage( text: text, ); | |
setState(() { | |
_messages.insert(0, message); | |
}); | |
} | |
BoxDecoration myBoxDecoration() { | |
return BoxDecoration( | |
border: Border.all( | |
width: 3.0, | |
color: Colors.blue, | |
), | |
borderRadius: BorderRadius.all(Radius.circular(5.0)), | |
); | |
} | |
} | |
// https://medium.com/@suragch/adding-a-border-to-a-widget-in-flutter-d387bc5d7cff |
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