added tapbarview to display data

lib/main.dart

@@ -1,9 +1,7 @@
 
 import 'package:energy_bilance/models/EnergyBilanceModel.dart';
-import 'package:energy_bilance/models/MyInputModel.dart';
+import 'package:energy_bilance/widgets/EnergyDisplay.dart';
-import 'package:energy_bilance/widgets/MyCustomForm.dart';
 import 'package:energy_bilance/widgets/MyInputWidget.dart';
-import 'package:energy_bilance/widgets/MyTest.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -17,15 +15,11 @@ void main() {
             child: Center(
               child: Column(
                 mainAxisSize: MainAxisSize.min,
-                mainAxisAlignment: MainAxisAlignment.center,
+                mainAxisAlignment: MainAxisAlignment.start,
-                children: [
+                children: const [
-                  const Expanded(child: MyInputWidget()),
+                  Expanded(child: MyInputWidget()),
-                  Expanded(
+                  Divider(),
-                      child: Consumer<EnergyBilanceModel>(
+                  Expanded(child: EnergyDisplay()),
-                          builder: (context, model, child){
-                            return Text('Generierte Ekin: ${model.kineticEnergy}');
-                          }
-                      ))
                 ],
               )
 

lib/models/EnergyBilanceModel.dart

@@ -11,14 +11,26 @@ class EnergyBilanceModel extends ChangeNotifier {
 
   double _weight = 0;
 
-  static const double _gravity = 9.81; //in m/s^2
+  final double _gravity = 9.81; //in m/s^2
+
+  final double _waterHeatCapacity = 4.181; //J / (g * C°)
+  final double _ironHeatCapacity = 0.439; //in J / (g * C°)
+
+  double _waterTemparatureStart = 20; //in °C
+  final int _temparatureToBoilWater = 100; //in °C
+
+  double _ironTemparatureStart = 20; //in °C
+  final int _temparatureToMakeIronGlow = 700; //in °C
 
   double get deltaVelocity => _endVelocity - _startVelocity;
   double get deltaHeight => _endHeight - _startHeight;
 
-  double get potentialEnergy => _weight * _gravity * deltaHeight;
+  double get potentialEnergy => _weight * _gravity * deltaHeight; //in Joule = m^2 kg/s^2
   double get kineticEnergy => _weight * pow(deltaVelocity, 2) / 2;
 
+  double get amountOfBoilingWaterInL => (((potentialEnergy + kineticEnergy) / _waterHeatCapacity) / (_temparatureToBoilWater - _waterTemparatureStart)) / 1000; //in litre
+  double get amountOfGlowingIronInKg => (((potentialEnergy + kineticEnergy) / _ironHeatCapacity) / (_temparatureToMakeIronGlow - _ironTemparatureStart)) / 1000;
+
   void setStartVelocity(double v){
     _startVelocity = v;
     notifyListeners();

lib/models/MyInputModel.dart

@@ -1,12 +0,0 @@
-import 'package:flutter/cupertino.dart';
-
-class MyInputModel extends ChangeNotifier {
-  String _text = "Hallo Welt";
-
-  String get currentText => _text;
-
-  void changeText(String newText) {
-    _text = newText;
-    notifyListeners();
-  }
-}

lib/widgets/EnergyDisplay.dart

@@ -0,0 +1,49 @@
+import 'package:energy_bilance/models/EnergyBilanceModel.dart';
+import 'package:energy_bilance/widgets/TabDisplayWidget.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+class EnergyDisplay extends StatelessWidget {
+  const EnergyDisplay({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return DefaultTabController(
+        length: 3,
+        child: Scaffold(
+          appBar: AppBar(
+            title: const Text('Energie umrechnen in:'),
+            bottom: const TabBar(
+                tabs: [
+                  Tab(text: 'Wasser', icon: Icon(Icons.anchor_sharp),),
+                  Tab(text: 'Eisen', icon: Icon(Icons.iron)),
+                  Tab(text: 'Energie', icon: Icon(Icons.battery_charging_full),)
+                ]
+            ),
+          ),
+          body: TabBarView(
+              children: [
+                Consumer<EnergyBilanceModel>(
+                  builder: (context, model, child){
+                    return TabDisplayWidget('Wasser, das von 20 °C zum Kochen gebracht werden kann: ${double.parse((model.amountOfBoilingWaterInL).toStringAsFixed(2))} Liter');
+                  }
+                ),
+                Consumer<EnergyBilanceModel>(
+                    builder: (context, model, child){
+                      return TabDisplayWidget('Eisen, das von 20 °C zum Glühen gebracht werden kann: ${double.parse((model.amountOfGlowingIronInKg).toStringAsFixed(2))} Kilo');
+                    }
+                ),
+                Consumer<EnergyBilanceModel>(
+                    builder: (context, model, child){
+                      return TabDisplayWidget('Generierte potentielle Energie: ${model.potentialEnergy}\n'
+                          'Generierte kinetische Energie: ${model.kineticEnergy}');
+                    }
+                ),
+              ]
+          ),
+        )
+
+    );
+  }
+
+}

lib/widgets/MyAppBar.dart

@@ -1,25 +0,0 @@
-import 'package:flutter/material.dart';
-
-class MyAppBar extends StatelessWidget {
-  const MyAppBar({required this.title, super.key});
-
-  final Widget title;
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      height: 56.0,
-      padding: const EdgeInsets.symmetric(horizontal: 8.0),
-      decoration: BoxDecoration(color: Colors.blue[500]),
-      child: Row(
-        children: [
-          const IconButton(onPressed: null, icon: Icon(Icons.menu), tooltip: 'Navigation Menu'),
-          Expanded(child: title),
-          const IconButton(onPressed: null, icon: Icon(Icons.search), tooltip: 'Search')
-        ],
-      ),
-    );
-  }
-
-  
-}

lib/widgets/MyCustomForm.dart

@@ -1,43 +0,0 @@
-import 'package:energy_bilance/models/MyInputModel.dart';
-import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
-
-class MyCustomForm extends StatefulWidget {
-  const MyCustomForm({super.key});
-
-  @override
-  State<StatefulWidget> createState() {
-    return MyCustomFormState();
-  }
-}
-
-class MyCustomFormState extends State<MyCustomForm> {
-
-  final _formKey = GlobalKey<FormState>();
-
-  @override
-  Widget build(BuildContext context) {
-    return Form(
-      key: _formKey,
-      child: Column(
-        children: <Widget>[
-          TextFormField(
-            decoration: const InputDecoration(
-              labelText: 'Gib was ein',
-              hintText: 'keine Zahlen bidde'
-            ),
-            validator: (String? value) {
-              return (value != null && value.contains('@')) ? 'Do not use the @ char.' : null;
-            },
-            onChanged: (value) {
-              Provider.of<MyInputModel>(context, listen: false).changeText(value);
-            }
-
-          )
-        ],
-      ),
-    );
-  }
-
-
-}

lib/widgets/MyInputWidget.dart

@@ -15,7 +15,7 @@ class MyInputWidget extends StatelessWidget {
           children: [
             Row(
               mainAxisSize: MainAxisSize.min,
-              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+              mainAxisAlignment: MainAxisAlignment.start,
 
               children: [
                 Expanded(

lib/widgets/MyScaffold.dart

@@ -1,24 +0,0 @@
-import 'package:energy_bilance/widgets/MyAppBar.dart';
-import 'package:flutter/material.dart';
-
-class MyScaffold extends StatelessWidget {
-  const MyScaffold({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return Material(
-      child: Column(
-        children: [
-          MyAppBar(title: Text('MyAppBar', style: Theme.of(context).primaryTextTheme.headline6)),
-          const Expanded(child:
-            Center(
-              child: Text("Hello World!"),
-            )
-          )
-        ],
-      ),
-    );
-  }
-  
-  
-}

lib/widgets/MyTest.dart

@@ -1,30 +0,0 @@
-import 'package:energy_bilance/models/MyInputModel.dart';
-import 'package:energy_bilance/widgets/MyCustomForm.dart';
-import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
-
-class MyTest extends StatelessWidget {
-  const MyTest({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return Material(
-      child:
-      ChangeNotifierProvider(create: (context) => MyInputModel(),
-        child: Column(
-          children: [
-            const MyCustomForm(),
-            Consumer<MyInputModel>(
-                builder: (context, input, child){
-                  return Text('Das ist die Eingabe: ${input.currentText}');
-                }
-            ),
-          ],
-        ),
-      )
-
-    );
-  }
-
-
-}

lib/widgets/TabDisplayWidget.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/cupertino.dart';
+
+class TabDisplayWidget extends StatelessWidget {
+
+  String _displayText = "";
+
+  TabDisplayWidget(String displayText, {super.key}) {
+    _displayText = displayText;
+  }
+
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+        child: Text(_displayText)
+    );
+  }
+
+}

test/EnergyBilanceModelTest.dart

@@ -0,0 +1,21 @@
+import 'dart:async';
+
+import 'package:energy_bilance/models/EnergyBilanceModel.dart';
+
+void main() async {
+  //Location _locationModel;StreamController<Location> _controller;setUp(() {
+  _controller = StreamController<EnergyBilanceModel>();
+  _energyModel = EnergyBilanceModel();
+});group('[Location Model]', () {
+//test('[Model] Check individual values', () async {
+_locationModel = Location(
+city: 'London',
+countryName: 'England',
+country: 'England',
+currency: 'GBP',
+ip: '',
+inEu: true,
+languages: 'EN',
+);// BEGIN TESTS....
+expect(_locationModel.city, 'London');expect(_locationModel.countryName.runtimeType, equals(String));expect(_locationModel.country, isNotNull);expect(_locationModel.ip, isEmpty);expect(_locationModel.inEu, isTrue);expect(_locationModel.languages, contains('EN'));expect(_locationModel.currency, startsWith('G'));expect(_locationModel.country, matches('England'));
+});}