Flutterhelp code review

Flutterhelp

import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_calendar/calendar.dart';
import 'package:syncfusion_flutter_core/core.dart';


void main() {
	return runApp(MyApp());
}

class MyApp extends StatelessWidget {
	// This widget is the root of your application.
	@override
	Widget build(BuildContext context) {
		return MaterialApp(
			title: 'Flutter Demo',
			theme: ThemeData(
				// This is the theme of your application.
				//
				// Try running your application with "flutter run". You'll see the
				// application has a blue toolbar. Then, without quitting the app, try
				// changing the primarySwatch below to Colors.green and then invoke
				// "hot reload" (press "r" in the console where you ran "flutter run",
				// or simply save your changes to "hot reload" in a Flutter IDE).
				// Notice that the counter didn't reset back to zero; the application
				// is not restarted.
				primarySwatch: Colors.blue,
				// This makes the visual density adapt to the platform that you run
				// the app on. For desktop platforms, the controls will be smaller and
				// closer together (more dense) than on mobile platforms.
				visualDensity: VisualDensity.adaptivePlatformDensity,
			),
			initialRoute: '/CalendarList',
			routes: {
				'/CalendarList': (context) => CalendarList(),
				'/CreateOrder': (context) => CreateOrder(),
				'/Reports': (context) => Reports(),
			},
		);
	}
}

Widget _heroAppBar({BuildContext context}){
	print(context);
	return PreferredSize(
		preferredSize: Size.fromHeight(kToolbarHeight),
		child: Hero(
			tag: 'app_bar',
			child: Builder(builder: (BuildContext context) {
				return AppBar(
					title: const Text('AppBar Demo'),
					actions: <Widget>[
						IconButton(
							icon: const Icon(Icons.add_box),
							tooltip: 'Show Snackbar',
							onPressed: () {
								Navigator.pushReplacementNamed(
									context,'/CreateOrder'
								);
							},
						),
						IconButton(
							icon: const Icon(Icons.calendar_today),
							tooltip: 'Next page',
							onPressed: () {
								Navigator.pushReplacementNamed(
									context, '/CalendarList'
								);
							}
						),
						IconButton(
							icon: const Icon(Icons.assessment),
							tooltip: 'Next page',
							onPressed: () {
								Navigator.pushReplacementNamed(
									context, '/CalendarList'
								);
							}
						),
					],
				);
			}
			),
		),
	);
}


// CREATE ORDER page
class CreateOrder extends StatefulWidget {
	CreateOrder({Key key, this.title}) : super(key: key);

	// This widget is the home page of your application. It is stateful, meaning
	// that it has a State object (defined below) that contains fields that affect
	// how it looks.

	// This class is the configuration for the state. It holds the values (in this
	// case the title) provided by the parent (in this case the App widget) and
	// used by the build method of the State. Fields in a Widget subclass are
	// always marked "final".

	final String title;

	@override
	_CreateOrderState createState() => _CreateOrderState();
}

class _CreateOrderState extends State<CreateOrder> {
	int _counter = 0;
	String _dropDownMenuBagType1;
	String _dropDownMenuBagType2;
	TextEditingController _controller;
	DateTime _date = new DateTime.now();

	Future<Null> _selectDate(BuildContext context) async {
		final DateTime picked = await showDatePicker(context: context, initialDate: _date, firstDate: new DateTime(2020), lastDate: new DateTime(2030));
		if (picked != null && picked != _date) {
			print('Date Selected: ${_date.toString()} ');
			setState(() {
			  _date = picked;
			});
		}
	}

	void initState() {
		super.initState();
		_controller = TextEditingController();
	}

	void dispose() {
		_controller.dispose();
		super.dispose();
	}

	Future<void> _confirmOrderCreation() async {
		await _selectDate(context);
		showDialog(
			context: context,
			builder: (_) => AlertDialog(
				title: (_counter > 1)? Text("Create $_counter Orders?") : Text("Create an Order?"),
				content: Text("This will create an order and print labels on $_date and will start printing labels"),
				actions: <Widget>[
					FlatButton(
						child: Text("No"),
						onPressed: () {
							Navigator.of(context).pop(); // close the bubble
						},
					),
					FlatButton(
						child: Text("Yes"),
						onPressed: (){
							// ERPNEXT //


							Navigator.of(context).pop(); // close the bubble
						},
					),
				],
			)
		);
	}

	@override
	Widget build(BuildContext context) {
		// This method is rerun every time setState is called, for instance as done
		// by the _incrementCounter method above.
		//
		// The Flutter framework has been optimized to make rerunning build methods
		// fast, so that you can just rebuild anything that needs updating rather
		// than having to individually change instances of widgets.
		return Scaffold(
			appBar: _heroAppBar(context:context),
			body: Center(
				// Center is a layout widget. It takes a single child and positions it
				// in the middle of the parent.
				child: Column(
					// Column is also a layout widget. It takes a list of children and
					// arranges them vertically. By default, it sizes itself to fit its
					// children horizontally, and tries to be as tall as its parent.
					//
					// Invoke "debug painting" (press "p" in the console, choose the
					// "Toggle Debug Paint" action from the Flutter Inspector in Android
					// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
					// to see the wireframe for each widget.
					//
					// Column has various properties to control how it sizes itself and
					// how it positions its children. Here we use mainAxisAlignment to
					// center the children vertically; the main axis here is the vertical
					// axis because Columns are vertical (the cross axis would be
					// horizontal).
					mainAxisAlignment: MainAxisAlignment.center,
					children: <Widget>[
						Padding(
							padding: EdgeInsets.all(8),
							child: Text(
								'Choose Bag Type',
								style: Theme.of(context).textTheme.headline5,
							),
						),Padding(
							padding: EdgeInsets.fromLTRB(40,0,40,40),
								child: DropdownButton<String>(
									value: _dropDownMenuBagType1,
									icon: Icon(Icons.arrow_downward),
									iconSize: 24,
									elevation: 16,
									isExpanded: true,
									style: TextStyle(color: Colors.blue),
									underline: Container(
										height: 2,
										color: Colors.blue,
									),
									onChanged: (String newValue) {
										setState(() {
											_dropDownMenuBagType1 = newValue;
										});
									},
									items: <String>['One', 'Two', 'Free', 'Four']
										.map<DropdownMenuItem<String>>((String value) {
										return DropdownMenuItem<String>(
											value: value,
											child: Text(value),
										);
									}).toList(),
								),
						),
						Padding(
							padding: EdgeInsets.all(8),
							child: Text(
								'End Customer',
								style: Theme.of(context).textTheme.headline5,
							),
						),
						Padding(
							padding: EdgeInsets.fromLTRB(40,0,40,40),
							child: Row(
								children: <Widget>[
									IconButton(
										icon: Icon(Icons.group_add),
									),
									Expanded(
										child: DropdownButton<String>(
											value: _dropDownMenuBagType2,
											icon: Icon(Icons.arrow_downward),
											iconSize: 24,
											elevation: 16,
											isExpanded: true,
											style: TextStyle(color: Colors.blue),
											underline: Container(
												height: 2,
												color: Colors.blue,
											),
											onChanged: (String newValue) {
												setState(() {
													_dropDownMenuBagType2 = newValue;
												});
											},
											items: <String>['One', 'Two', 'Free', 'Four']
												.map<DropdownMenuItem<String>>((String value) {
												return DropdownMenuItem<String>(
													value: value,
													child: Text(value),
												);
											}).toList(),
										),
									),
								],
							),
						),
						Padding(
							padding: EdgeInsets.all(8),
							child: Text(
								'Order Size',
								style: Theme.of(context).textTheme.headline5,
							),
						),Padding(
							padding: EdgeInsets.fromLTRB(40,0,40,40),
								child: TextField(
									controller: _controller,
									decoration: InputDecoration(
										enabledBorder: UnderlineInputBorder(
											borderSide: BorderSide(color: Colors.blue, width: 2),
										),
									),
									onChanged: (userInput) async {
										setState(() {
										  _counter = userInput?.isEmpty ?  0 :int.parse(userInput);
										  print(_counter);
										});
									},
								),
						),
						Padding(
							padding: EdgeInsets.all(8),
							child: RaisedButton(
								onPressed: _counter > 0
									&& _dropDownMenuBagType1 != null
									&& _dropDownMenuBagType2 != null
									? _confirmOrderCreation : null,
								child: Text(
									'Submit',
								),
							),
						),
					],
				),
			),
		);
	}
}

// CALENDAR Page
class CalendarList extends StatefulWidget {
  @override
  _CalendarListState createState() => _CalendarListState();
}

class _CalendarListState extends State<CalendarList> {
	@override
	Widget build(BuildContext context) {
		return Scaffold(
			appBar: _heroAppBar(context:context),
			body: Center(
				child: SfCalendar(
					view: CalendarView.month,
					monthViewSettings: MonthViewSettings(showAgenda: true),
				),
			),
		);
	}
}


// REPORTS PAGE
class Reports extends StatefulWidget {
  @override
  _ReportsState createState() => _ReportsState();
}

class _ReportsState extends State<Reports> {
  @override
  Widget build(BuildContext context) {
    return Container();
  }
}


// TODO : rename all tooltips
// todo: clean up