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import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
void main() {
runApp(new MessengerApp());
}
final ThemeData iosTheme = new ThemeData(
primarySwatch: Colors.orange,
primaryColor: Colors.grey[100],
primaryColorBrightness: Brightness.light,
);
final ThemeData defaultTheme = new ThemeData(
primarySwatch: Colors.blue,
accentColor: Colors.orangeAccent[400],
);
const String _name = "Marvin Borner";
class MessengerApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: "BEAM-Messenger",
theme:
defaultTargetPlatform == TargetPlatform.iOS ? iosTheme : defaultTheme,
home: new ChatScreen(),
);
}
}
class ChatMessage extends StatelessWidget {
ChatMessage({this.text, this.animationController});
final String text;
final AnimationController animationController;
@override
Widget build(BuildContext context) {
return new SizeTransition(
sizeFactor: new CurvedAnimation(
parent: animationController, curve: Curves.easeOut),
axisAlignment: 0.0,
child: new Container(
margin: const EdgeInsets.symmetric(vertical: 10.0),
child: new Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
new Container(
margin: const EdgeInsets.only(right: 16.0),
child: new CircleAvatar(child: new Text(_name[0])),
),
new Expanded(
child: new Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
new Text(_name, style: Theme.of(context).textTheme.subhead),
new Container(
margin: const EdgeInsets.only(top: 5.0),
child: new Text(text),
),
],
),
),
],
),
));
}
}
class ChatScreen extends StatefulWidget {
@override
State createState() => new ChatScreenState();
}
class ChatScreenState extends State<ChatScreen> with TickerProviderStateMixin {
final List<ChatMessage> _messages = <ChatMessage>[];
final TextEditingController _textController = new TextEditingController();
bool _isComposing = false;
void _handleSubmitted(String text) {
_textController.clear();
setState(() {
_isComposing = false;
});
ChatMessage message = new ChatMessage(
text: text,
animationController: new AnimationController(
duration: new Duration(milliseconds: 700),
vsync: this,
),
);
setState(() {
_messages.insert(0, message);
});
message.animationController.forward();
}
void dispose() {
for (ChatMessage message in _messages)
message.animationController.dispose();
super.dispose();
}
Widget _buildTextComposer() {
return new IconTheme(
data: new IconThemeData(color: Theme.of(context).accentColor),
child: new Container(
margin: const EdgeInsets.symmetric(horizontal: 8.0),
child: new Row(children: <Widget>[
new Flexible(
child: new TextField(
controller: _textController,
onChanged: (String text) {
setState(() {
_isComposing = text.length > 0;
});
},
onSubmitted: _handleSubmitted,
decoration: new InputDecoration.collapsed(
hintText: "Send a message..."),
),
),
new Container(
margin: new EdgeInsets.symmetric(horizontal: 4.0),
child: Theme.of(context).platform == TargetPlatform.iOS
? new CupertinoButton(
child: new Text("Send"),
onPressed: _isComposing
? () => _handleSubmitted(_textController.text)
: null,
)
: new IconButton(
icon: new Icon(Icons.send),
onPressed: _isComposing
? () => _handleSubmitted(_textController.text)
: null,
)),
]),
decoration: Theme.of(context).platform == TargetPlatform.iOS
? new BoxDecoration(
border:
new Border(top: new BorderSide(color: Colors.grey[200])))
: null),
);
}
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("BEAM-Messenger"),
elevation:
Theme.of(context).platform == TargetPlatform.iOS ? 0.0 : 4.0),
body: new Container(
child: 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: new BoxDecoration(color: Theme.of(context).cardColor),
child: _buildTextComposer(),
),
]),
decoration: Theme.of(context).platform == TargetPlatform.iOS
? new BoxDecoration(
border:
new Border(top: new BorderSide(color: Colors.grey[200])))
: null),
);
}
}
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