07 Flutter: Adding-Deleting text in TextField

main.dart
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
home: new MyTextInput()
));
}
class MyTextInput extends StatefulWidget {
MyTextInputState createState() => new MyTextInputState();
}
class MyTextInputState extends State<MyTextInput>{
final TextEditingController controller = new TextEditingController();
String result = "";
Widget build(BuildContext context){
return new Scaffold(
appBar: new AppBar(title: new Text("Input Text"), backgroundColor: Colors.deepOrange),
body: new Container(
child: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new TextField(
decoration: new InputDecoration(
hintText: "Type in here"
),
//onChanged is called whenever we add or delete something on Text Field
onSubmitted: (String str){
setState((){
result = result + '\n' + str;
});
controller.text = "";
},
controller: controller
),
//displaying input text
new Text(result)
]
)
)
)
);
}
}