03 Flutter: Buttons and Stateful widgets

main.dart
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
home: new AwesomeButton()
));
}
class AwesomeButton extends StatefulWidget {
AwesomeButtonState createState() => new AwesomeButtonState();
}
class AwesomeButtonState extends State<AwesomeButton> {
int counter = 0;
List<String> strings = ["Flutter", "Is", "Awesome"];
String displayedString = "";
//you can also declare variables like this
// var counter = 0;
// var strings = ["Flutter", "Is", "Awesome"];
void onPressed(){
setState(() {
displayedString = strings[counter];
counter = counter < 2 ? counter+1 : 0;
});
}
Widget build(BuildContext context){
return new Scaffold(
appBar: new AppBar(title: new Text("Stateful Widget!"), backgroundColor: Colors.deepOrange),
body: new Container(
child: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Text(displayedString, style: new TextStyle(fontSize: 30.0, fontWeight: FontWeight.bold)),
new Padding(padding: new EdgeInsets.all(15.0)),
new RaisedButton(
child: new Text("Press me!", style: new TextStyle(color: Colors.white, fontStyle: FontStyle.italic, fontSize: 20.0)),
color: Colors.red,
onPressed: onPressed
)
]
)
)
)
);
}
}