import 'package:flutter/cupertino.dart';

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      title: "Sateful App Exampl",
      home: FavoriteCity(),
    )
  );
}
//----------------------------------------------------------
class FavoriteCity extends StatefulWidget{
  @override
  State<StatefulWidget> createState() {

    return _FavoriteCityState();
  }
}
//---------------------------------------------------------
class _FavoriteCityState extends State<FavoriteCity>{
  String nameCity = "";
  var _currencies = ['Rupess','Dollar','Pound','other'];
  var _currentItemSelected = 'Rupees';

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        title: Text("Stateful App Example"),
      ),
      body: Container(
        color: Colors.lightBlueAccent,
        margin: EdgeInsets.all(20.0),
        child: Column(
          children: <Widget>[
            TextField(
              onSubmitted: (String userInput){
                setState(() {
                  nameCity = userInput;

                });
              },
            ),
            DropdownButton<String>(

              items: _currencies.map((String dropDownStringItem){
                return DropdownMenuItem<String>(
                  value: dropDownStringItem,
                  child: Text(dropDownStringItem),
                );
              }).toList(),

              onChanged: (String newValueSelected){
                //your code to execute , when a menu item is selected from drop down
                _onDropDownItemSelected(newValueSelected);
              },
              value: _currentItemSelected,
            ),
            Padding(
                padding: EdgeInsets.all(30.0),
                child: Text(
                 "Your Text City Is :- $nameCity",
                 style: TextStyle(fontSize: 20.0,backgroundColor: Colors.yellow),
            ))
          ],
        ),
      ),
    );
  }

 void _onDropDownItemSelected(String newValueSelected){
   setState(() {
     this._currentItemSelected = newValueSelected;
   });
 }
}