18 Flutter: RaisedButton with parameters

main.dart
import 'package:flutter/material.dart';
void main(){
runApp(new MaterialApp(
home: new MyApp(),
));
}
class MyApp extends StatefulWidget {
_State createState() => new _State();
}
class _State extends State<MyApp>{
String _value = 'Hello World';
void _onPressed(String value) {
setState(() {
_value = value;
});
}
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Name here'),
),
//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(_value),
//dart treates everything as objects so we pass a function in onPressed value
new RaisedButton(onPressed: () => _onPressed('Hello Raunak'), child: new Text('Click me')),
],
),
),
),
);
}
}