Flutter-Demos Raised Buttons,Alert Box,Three Column Widegets

Flutter-Demos Raised Buttons,Alert Box,Three Column Widegets import 'package:flutter/material.dart';
	class Home extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	return Center(
	child: Container(
	padding: EdgeInsets.only(left: 10.0, top: 40.0),
	alignment: Alignment.center,
	color: Colors.deepPurple,
	child: Column(
	children: <Widget>[
	Row(
	children: <Widget>[
	Expanded(
	child: Text(
	"Spice Jet",
	textDirection: TextDirection.ltr,
	style: TextStyle(
	decoration: TextDecoration.none,
	fontSize: 35.0,
	fontFamily: 'Raleway',
	fontWeight: FontWeight.w700,
	color: Colors.white),
	)),
	Expanded(
	child: Text(
	"From Mumbai to Bangalore via New Delhi",
	textDirection: TextDirection.ltr,
	style: TextStyle(
	decoration: TextDecoration.none,
	fontSize: 20.0,
	fontFamily: 'Raleway',
	fontWeight: FontWeight.w700,
	color: Colors.white),
	)),
	],
	),
	Row(
	children: <Widget>[
	Expanded(
	child: Text(
	"Air India",
	textDirection: TextDirection.ltr,
	style: TextStyle(
	decoration: TextDecoration.none,
	fontSize: 35.0,
	fontFamily: 'Raleway',
	fontWeight: FontWeight.w700,
	color: Colors.white),
	)),
	Expanded(
	child: Text(
	"From Jaipur to Goa",
	textDirection: TextDirection.ltr,
	style: TextStyle(
	decoration: TextDecoration.none,
	fontSize: 20.0,
	fontFamily: 'Raleway',
	fontWeight: FontWeight.w700,
	color: Colors.white),
	)),
	],
	),
	FlightImageAsset(),
	FlightBookButton()
	],
	)));
	}
	}
	class FlightImageAsset extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	AssetImage assetImage = AssetImage('images/flight.png');
	Image image = Image(
	image: assetImage,
	width: 250.0,
	height: 250.0,
	);
	return Container(
	child: image,
	);
	}
	}
	class FlightBookButton extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	return Container(
	margin: EdgeInsets.only(top: 30.0),
	width: 250.0,
	height: 50.0,
	child: RaisedButton(
	color: Colors.deepOrange,
	child: Text(
	"Book Your Flight",
	style: TextStyle(
	fontSize: 20.0,
	color: Colors.white,
	fontFamily: 'Raleway',
	fontWeight: FontWeight.w700),
	),
	elevation: 6.0,
	onPressed: () => bookFlight(context)),
	);
	}
	void bookFlight(BuildContext context) {
	var alertDialog = AlertDialog(
	title: Text("Flight Booked Successfully"),
	content: Text("Have a pleasant flight"),
	);
	showDialog(
	context: context,
	builder: (BuildContext context) => alertDialog);
	}
	}