36 Flutter: Rows and Columns

main.dart

import 'package:flutter/material.dart';
import 'dart:async';

void main(){
  runApp(new MaterialApp(
    home: new MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  @override
  _State createState() => new _State();
}

//State is information of the application that can change over time or when some actions are taken.
class _State extends State<MyApp>{

  TextEditingController _user = new TextEditingController();
  TextEditingController _pass = new TextEditingController();

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Name here'),
        backgroundColor: Colors.red,
      ),
      //hit Ctrl+space in intellij to know what are the options you can use in flutter widgets
      body: new Container(
        padding: new EdgeInsets.all(32.0),
        child: new Center(
          child: new Column(
            children: <Widget>[
              new Text('Please Login'),
              new Row(
                children: <Widget>[
                  new Text('Username'),
                  /*this will give an error because TextField is infinite, you can type
                  and type, it doesn't know where to stop and confuse Flutter but our
                  screen width is limited o to solve this we use 'Expanded' widget
                  controller is like an Android Cursor and we use it with TextField*/
                  //new TextField(controller: _user,)

                  new Expanded(child: new TextField(controller: _user,))
                ],
              ),
              new Row(
                children: <Widget>[
                  new Text('Password'),
                  //obscureText changes text to dots for password fields
                  new Expanded(child: new TextField(controller: _pass, obscureText: true,))
                ],
              ),

              new Padding(
                padding: new EdgeInsets.all(32.0),
                //onPressed will show login with the username typed on terminal
                child: new RaisedButton(onPressed: () => print('Login ${_user.text}'), child: new Text('Click me'),),
              )

            ],
          ),
        ),
      ),
    );
  }
}