chat.dart

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

final ThemeData kIOSTheme = new ThemeData(
  primarySwatch: Colors.yellow,
  primaryColor: Colors.yellow[500],
  primaryColorBrightness: Brightness.light,
);

final ThemeData kDefaultTheme = new ThemeData(
  primarySwatch: Colors.green,
  accentColor: Colors.greenAccent[400],
);
const String _name = "Farmer";
class Forum extends StatelessWidget {
  @override

  Widget build(BuildContext context) {
    return new MaterialApp(

      title: "Forum",

      debugShowCheckedModeBanner: false,

      theme: defaultTargetPlatform == TargetPlatform.iOS
          ? kIOSTheme
          : kDefaultTheme,
      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.green[300])))
              : null),
    );
  }
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
          title: Padding(
            padding: const EdgeInsets.all(8.0),
            child: new Text("Forum"),
          ),
          actions: <Widget>[
            Padding(
              padding: const EdgeInsets.all(20.0),
              child: Icon(Icons.people),
            )
          ],

          elevation:
          Theme.of(context).platform == TargetPlatform.iOS ? 0.0 : 4.0
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: 0, // this will be set when a new tab is tapped
        items: [
         
          BottomNavigationBarItem(
            icon: new Icon(Icons.message),
            title: new Text("Message"),
         ),
          BottomNavigationBarItem(
            icon: new Icon(Icons.edit),
            title: new Text("Edit"),
           ),
          BottomNavigationBarItem(
              icon: Icon(Icons.person),
              title: Text("Profile"),
          )
        ],
      ),
 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.green[400]))) : null),//new
    );
  }
}