main.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

enum RunningState { stopped, running, paused }

final _options = [
  {"name": "Kochwäsche 30°C", "duration": 150},
  {"name": "Kochwäsche 40°C", "duration": 155}
];

class _MyHomePageState extends State<MyHomePage> {
  RunningState state = RunningState.stopped;
  int _counter = 0;
  String _program = _options.first["name"];

  void _onProgramChange(String newValue) {
    setState(() {
      if (_counter == 0) {
        _counter = 240;
      } else {}
      _program = newValue;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          DropdownButton<String>(
            value: _program,
            icon: Icon(Icons.arrow_downward),
            iconSize: 24,
            elevation: 16,
            style: TextStyle(color: Colors.deepPurple),
            underline: Container(
              height: 2,
              color: Colors.deepPurpleAccent,
            ),
            onChanged: _onProgramChange,
            items: _options.map<DropdownMenuItem<String>>((Map value) {
              return DropdownMenuItem<String>(
                value: value["name"],
                child: Text(value["name"]),
              );
            }).toList(),
          ),
          Text(
            'You have pushed the button this many times:',
          ),
          Text(
            '$_counter',
            style: Theme.of(context).textTheme.headline4,
          ),
        ],
      ),
    ));
  }
}