Layout created for single screen app (#2)

lib/BaseStatelessWidget.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:stacked/stacked.dart';
+
+import 'BaseViewModel.dart';
+import 'Utils/Constants.dart';
+import 'Utils/ViewState.dart';
+import 'Utils/ViewUtils.dart';
+
+abstract class BaseStatelessWidget<T extends BaseViewmodel>
+    extends StatelessWidget {
+  const BaseStatelessWidget({super.key});
+
+  T createViewModel();
+
+  Widget displayWidget(BuildContext context, T model, Widget? child);
+
+  @override
+  Widget build(BuildContext parent) {
+    return Scaffold(
+      body: Container(
+        padding: const EdgeInsets.all(PADDING_GLOBAL),
+        decoration: const BoxDecoration(
+            gradient: LinearGradient(
+                begin: Alignment.topLeft,
+                end: Alignment.bottomRight,
+                colors: [colourTwo, colourThree])),
+        child: ViewModelBuilder<T>.reactive(
+            viewModelBuilder: () => createViewModel(),
+            builder: (context, model, child) {
+              var state = model.viewState;
+
+              if (state is HasStarted) {
+                onStarted();
+                return const Center(
+                  child: CircularProgressIndicator(),
+                );
+              } else if (state is HasError) {
+                WidgetsBinding.instance.addPostFrameCallback(
+                    (_) => ViewUtils.displayToast(parent, state.error));
+              }
+              return Center(
+                child: displayWidget(context, model, child),
+              );
+            },
+            onModelReady: (T model) => onModelReady(model)),
+      ),
+    );
+  }
+
+  void onModelReady(model) {}
+
+  void onStarted() {}
+}

lib/BaseViewModel.dart

@@ -0,0 +1,24 @@
+import 'package:stacked/stacked.dart';
+
+import 'Utils/ViewState.dart';
+
+abstract class BaseViewmodel extends BaseViewModel{
+
+  ViewState _viewState = Idle();
+  ViewState get viewState => _viewState;
+
+  void onStart() {
+    _viewState = HasStarted();
+    notifyListeners();
+  }
+
+  void onSuccess(dynamic data) {
+    _viewState = HasData(data);
+    notifyListeners();
+  }
+
+  void onError(String error) {
+    _viewState = HasError(error);
+    notifyListeners();
+  }
+}

lib/Home.dart

@@ -0,0 +1,43 @@
+import 'package:easy_cc_flutter/MainViewModel.dart';
+import 'package:easy_cc_flutter/views/DropDownBox.dart';
+import 'package:easy_cc_flutter/views/EditText.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/src/widgets/framework.dart';
+
+import 'BaseStatelessWidget.dart';
+
+class HomePage extends BaseStatelessWidget<MainViewModel> {
+  @override
+  MainViewModel createViewModel() {
+    return MainViewModel();
+  }
+
+  @override
+  Widget displayWidget(
+      BuildContext context, MainViewModel model, Widget? child) {
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: [
+        Padding(
+          padding: const EdgeInsets.all(8.0),
+          child: Column(
+            children: [
+              DropDownBox(model.data, (selected) {}),
+              EditText("Enter conversion from", model.top, (selection) => {})
+            ],
+          ),
+        ),
+        Padding(
+          padding: const EdgeInsets.all(8.0),
+          child: Column(
+            children: [
+              DropDownBox(model.data, (selected) {}),
+              EditText("Enter conversion from", model.bottom, (selection) => {})
+            ],
+          ),
+        ),
+      ],
+    );
+  }
+}

lib/MainViewModel.dart

@@ -0,0 +1,163 @@
+import 'package:easy_cc_flutter/BaseViewModel.dart';
+
+class MainViewModel extends BaseViewmodel {
+
+  String? top;
+  String? bottom;
+
+  final List<String> data = <String>['ALL - Albanian Lek',
+    'AFN - Afghan Afghani',
+    'DZD - Algerian Dinar',
+    'AOA - Angolan Kwanza',
+    'ARS - Argentine Peso',
+    'AMD - Armenian Dram',
+    'AWG - Aruban Florin',
+    'AUD - Australian Dollar',
+    'AZN - Azerbaijani Manat',
+    'BSD - Bahamian Dollar',
+    'BHD - Bahraini Dinar',
+    'BDT - Bangladeshi Taka',
+    'BBD - Barbadian Dollar',
+    'BYR - Belarusian Ruble',
+    'BZD - Belize Dollar',
+    'BTN - Bhutanese Ngultrum',
+    'BTC - Bitcoin',
+    'BOB - Bolivian Boliviano',
+    'BAM - Bosnia And Herzegovina Konvertibilna Marka',
+    'BWP - Botswana Pula',
+    'BRL - Brazilian Real',
+    'GBP - British Pound',
+    'BND - Brunei Dollar',
+    'BGN - Bulgarian Lev',
+    'BIF - Burundi Franc',
+    'KHR - Cambodian Riel',
+    'CAD - Canadian Dollar',
+    'CVE - Cape Verdean Escudo',
+    'KYD - Cayman Islands Dollar',
+    'XAF - Central African CFA Franc',
+    'XPF - CFP Franc',
+    'CLP - Chilean Peso',
+    'CNY - Chinese Yuan',
+    'COP - Colombian Peso',
+    'KMF - Comorian Franc',
+    'CDF - Congolese Franc',
+    'CRC - Costa Rican Colon',
+    'HRK - Croatian Kuna',
+    'CUP - Cuban Peso',
+    'CZK - Czech Koruna',
+    'DKK - Danish Krone',
+    'DJF - Djiboutian Franc',
+    'DOP - Dominican Peso',
+    'XCD - East Caribbean Dollar',
+    'EGP - Egyptian Pound',
+    'ERN - Eritrean Nakfa',
+    'ETB - Ethiopian Birr',
+    'EUR - Euro',
+    'FKP - Falkland Islands Pound',
+    'FJD - Fijian Dollar',
+    'GMD - Gambian Dalasi',
+    'GEL - Georgian Lari',
+    'GHS - Ghanaian Cedi',
+    'GIP - Gibraltar Pound',
+    'GTQ - Guatemalan Quetzal',
+    'GNF - Guinean Franc',
+    'GYD - Guyanese Dollar',
+    'HTG - Haitian Gourde',
+    'HNL - Honduran Lempira',
+    'HKD - Hong Kong Dollar',
+    'HUF - Hungarian Forint',
+    'ISK - Icelandic Kr\u00f3na',
+    'INR - Indian Rupee',
+    'IDR - Indonesian Rupiah',
+    'IRR - Iranian Rial',
+    'IQD - Iraqi Dinar',
+    'ILS - Israeli New Sheqel',
+    'JMD - Jamaican Dollar',
+    'JPY - Japanese Yen',
+    'JOD - Jordanian Dinar',
+    'KZT - Kazakhstani Tenge',
+    'KES - Kenyan Shilling',
+    'KWD - Kuwaiti Dinar',
+    'KGS - Kyrgyzstani Som',
+    'LAK - Lao Kip',
+    'LVL - Latvian Lats',
+    'LBP - Lebanese Lira',
+    'LSL - Lesotho Loti',
+    'LRD - Liberian Dollar',
+    'LYD - Libyan Dinar',
+    'MOP - Macanese Pataca',
+    'MKD - Macedonian Denar',
+    'MGA - Malagasy Ariary',
+    'MWK - Malawian Kwacha',
+    'MYR - Malaysian Ringgit',
+    'MVR - Maldivian Rufiyaa',
+    'MRO - Mauritanian Ouguiya',
+    'MUR - Mauritian Rupee',
+    'MXN - Mexican Peso',
+    'MDL - Moldovan Leu',
+    'MNT - Mongolian Tugrik',
+    'MAD - Moroccan Dirham',
+    'MZN - Mozambican Metical',
+    'MMK - Myanma Kyat',
+    'NAD - Namibian Dollar',
+    'NPR - Nepalese Rupee',
+    'ANG - Netherlands Antillean Gulden',
+    'TWD - New Taiwan Dollar',
+    'NZD - New Zealand Dollar',
+    'NIO - Nicaraguan Cordoba',
+    'NGN - Nigerian Naira',
+    'KPW - North Korean Won',
+    'NOK - Norwegian Krone',
+    'OMR - Omani Rial',
+    'TOP - Paanga',
+    'PKR - Pakistani Rupee',
+    'PAB - Panamanian Balboa',
+    'PGK - Papua New Guinean Kina',
+    'PYG - Paraguayan Guarani',
+    'PEN - Peruvian Nuevo Sol',
+    'PHP - Philippine Peso',
+    'PLN - Polish Zloty',
+    'QAR - Qatari Riyal',
+    'RON - Romanian Leu',
+    'RUB - Russian Ruble',
+    'RWF - Rwandan Franc',
+    'SHP - Saint Helena Pound',
+    'WST - Samoan Tala',
+    'STD - Sao Tome And Principe Dobra',
+    'SAR - Saudi Riyal',
+    'RSD - Serbian Dinar',
+    'SCR - Seychellois Rupee',
+    'SLL - Sierra Leonean Leone',
+    'SGD - Singapore Dollar',
+    'SBD - Solomon Islands Dollar',
+    'SOS - Somali Shilling',
+    'ZAR - South African Rand',
+    'KRW - South Korean Won',
+    'XDR - Special Drawing Rights',
+    'LKR - Sri Lankan Rupee',
+    'SDG - Sudanese Pound',
+    'SRD - Surinamese Dollar',
+    'SZL - Swazi Lilangeni',
+    'SEK - Swedish Krona',
+    'CHF - Swiss Franc',
+    'SYP - Syrian Pound',
+    'TJS - Tajikistani Somoni',
+    'TZS - Tanzanian Shilling',
+    'THB - Thai Baht',
+    'TTD - Trinidad and Tobago Dollar',
+    'TND - Tunisian Dinar',
+    'TRY - Turkish New Lira',
+    'TMT - Turkmenistan Manat',
+    'AED - UAE Dirham',
+    'UGX - Ugandan Shilling',
+    'UAH - Ukrainian Hryvnia',
+    'USD - United States Dollar',
+    'UYU - Uruguayan Peso',
+    'UZS - Uzbekistani Som',
+    'VUV - Vanuatu Vatu',
+    'VEF - Venezuelan Bolivar',
+    'VND - Vietnamese Dong',
+    'XOF - West African CFA Franc',
+    'YER - Yemeni Rial',
+    'ZMW - Zambian Kwacha'];
+}

lib/Utils/Constants.dart

@@ -0,0 +1,9 @@
+import 'package:flutter/cupertino.dart';
+
+const Color colourOne = Color(0xFF253031);
+const Color colourTwo = Color(0xFF315659);
+const Color colourThree = Color(0xFF2978A0);
+const Color colourFour = Color(0xFF8549ff);
+const Color colourFive = Color(0xFFC6E0FF);
+
+const double PADDING_GLOBAL = 12;

lib/Utils/ViewState.dart

@@ -0,0 +1,20 @@
+import 'package:sealed_annotations/sealed_annotations.dart';
+
+@Sealed()
+abstract class ViewState {}
+
+class Idle implements ViewState {}
+
+class HasStarted implements ViewState {}
+
+class HasData implements ViewState {
+  final dynamic data;
+
+  HasData(this.data);
+}
+
+class HasError implements ViewState {
+  final String error;
+
+  HasError(this.error);
+}

lib/Utils/ViewUtils.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/cupertino.dart';
+import 'package:toast/toast.dart';
+
+class ViewUtils{
+
+  static displayToast(BuildContext context, String message){
+    Toast.show(
+        message,
+        duration: Toast.lengthLong,
+        gravity:  Toast.bottom
+    );
+  }
+
+  static displayToastDeferred(BuildContext context, String message){
+    WidgetsBinding.instance.addPostFrameCallback(
+            (_) => displayToast(context, message));
+  }
+}

lib/main.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
 
+import 'Home.dart';
+
 void main() {
   runApp(const MyApp());
 }
@@ -24,92 +26,7 @@ class MyApp extends StatelessWidget {
         // is not restarted.
         primarySwatch: Colors.blue,
       ),
-      home: const MyHomePage(title: 'Flutter Demo Home Page'),
+      home: HomePage(),
-    );
-  }
-}
-
-class MyHomePage extends StatefulWidget {
-  const MyHomePage({super.key, required this.title});
-
-  // 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
-  State<MyHomePage> createState() => _MyHomePageState();
-}
-
-class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
-
-  void _incrementCounter() {
-    setState(() {
-      // This call to setState tells the Flutter framework that something has
-      // changed in this State, which causes it to rerun the build method below
-      // so that the display can reflect the updated values. If we changed
-      // _counter without calling setState(), then the build method would not be
-      // called again, and so nothing would appear to happen.
-      _counter++;
-    });
-  }
-
-  @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: AppBar(
-        // Here we take the value from the MyHomePage object that was created by
-        // the App.build method, and use it to set our appbar title.
-        title: Text(widget.title),
-      ),
-      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>[
-            const Text(
-              'You have pushed the button this many times:',
-            ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headline4,
-            ),
-          ],
-        ),
-      ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
-        child: const Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
     );
   }
 }

lib/views/DropDownBox.dart

@@ -0,0 +1,37 @@
+import 'package:dropdown_search/dropdown_search.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+import '../Utils/Constants.dart';
+
+class DropDownBox extends StatelessWidget {
+  final List<String> _selection;
+  final Function(String?) _onChanged;
+
+  const DropDownBox(this._selection, this._onChanged, {super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      color: colourThree,
+      elevation: 2,
+      shape: const RoundedRectangleBorder(
+          borderRadius: BorderRadius.all(Radius.circular(22))),
+      child: DropdownSearch<String>(
+        popupProps: const PopupProps.dialog(showSearchBox: true),
+        items: _selection,
+        dropdownDecoratorProps: const DropDownDecoratorProps(
+          dropdownSearchDecoration: InputDecoration(
+            contentPadding: EdgeInsets.all(14),
+            border: InputBorder.none,
+            filled: true,
+            fillColor: Colors.transparent,
+            hintText: "Select a currency",
+          ),
+        ),
+        onChanged: _onChanged,
+      ),
+    );
+  }
+
+}

lib/views/EditText.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+
+import '../Utils/Constants.dart';
+
+class EditText extends StatelessWidget {
+  final String _hintText;
+  final String? _input;
+  final Function(String?) _onChanged;
+
+  const EditText(this._hintText, this._input, this._onChanged, {super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.symmetric(vertical: 2, horizontal: 4),
+      child: TextField(
+        controller: TextEditingController(
+          text: _input
+        ),
+        decoration: InputDecoration(
+          contentPadding: const EdgeInsets.all(14),
+          border: const OutlineInputBorder(
+            borderRadius: BorderRadius.all(Radius.circular(22)),
+            borderSide: BorderSide.none,
+          ),
+          filled: true,
+          fillColor: colourTwo,
+          hintText: _hintText,
+        ),
+        onChanged: _onChanged,
+
+      ),
+    );
+  }
+
+}

pubspec.lock

@@ -36,6 +36,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.16.0"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.2"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -43,6 +50,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.5"
+  dropdown_search:
+    dependency: "direct main"
+    description:
+      name: dropdown_search
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "5.0.0"
+  equatable:
+    dependency: transitive
+    description:
+      name: equatable
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.5"
   fake_async:
     dependency: transitive
     description:
@@ -67,6 +88,39 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  get:
+    dependency: transitive
+    description:
+      name: get
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.6.5"
+  get_it:
+    dependency: transitive
+    description:
+      name: get_it
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "7.2.0"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.6.4"
+  lazy_evaluation:
+    dependency: "direct main"
+    description:
+      name: lazy_evaluation
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   lints:
     dependency: transitive
     description:
@@ -95,6 +149,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
   path:
     dependency: transitive
     description:
@@ -102,6 +163,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.2"
+  provider:
+    dependency: transitive
+    description:
+      name: provider
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.0.3"
+  sealed_annotations:
+    dependency: "direct main"
+    description:
+      name: sealed_annotations
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.13.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -121,6 +196,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.10.0"
+  stacked:
+    dependency: "direct main"
+    description:
+      name: stacked
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.3.15"
+  stacked_core:
+    dependency: transitive
+    description:
+      name: stacked_core
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.4"
+  stacked_services:
+    dependency: "direct main"
+    description:
+      name: stacked_services
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.8.26"
   stream_channel:
     dependency: transitive
     description:
@@ -149,6 +245,34 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.4.9"
+  toast:
+    dependency: "direct main"
+    description:
+      name: toast
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.0"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.1"
+  universal_io:
+    dependency: transitive
+    description:
+      name: universal_io
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.4"
+  validators:
+    dependency: "direct main"
+    description:
+      name: validators
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.0"
   vector_math:
     dependency: transitive
     description:
@@ -158,3 +282,4 @@ packages:
     version: "2.1.2"
 sdks:
   dart: ">=2.18.0-190.0.dev <3.0.0"
+  flutter: ">=1.20.0"

pubspec.yaml

@@ -29,7 +29,15 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-
+  dropdown_search: 5.0.0
+  # utils
+  toast: ^0.3.0
+  validators: ^3.0.0
+  lazy_evaluation: ^1.1.0
+  sealed_annotations: ^1.13.0
+  # stacked
+  stacked: ^2.1.9
+  stacked_services: ^0.8.13
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.