Working app

lib/main.dart

@@ -1,111 +1,120 @@
 import 'package:flutter/material.dart';
 
+import './models/transaction.dart';
+import './widgets/new_transaction.dart';
+import './widgets/transaction_list.dart';
+import './widgets/chart.dart';
+
 void main() => runApp(MyApp());
 
 class MyApp extends StatelessWidget {
-  // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-      title: 'Flutter Demo',
+      title: 'Personal Expenses', 
+      home: MyHomePage(), 
       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,
+        primarySwatch: Colors.purple,
+        accentColor: Colors.amber,
+
+        fontFamily: 'Quicksand',
+        textTheme: ThemeData.light().textTheme.copyWith(
+            title: TextStyle(fontFamily: 'OpenSans', fontSize: 18, fontWeight: FontWeight.bold),
+            button: TextStyle(color: Colors.white),  
+          ),
+        appBarTheme: AppBarTheme(
+          textTheme: ThemeData.light().textTheme.copyWith(
+            title: TextStyle(fontFamily: 'OpenSans', fontSize: 20, fontWeight: FontWeight.bold)
+          )
+        )      
       ),
-      home: MyHomePage(title: 'Flutter Demo Home Page'),
+      debugShowCheckedModeBanner: false,
+
     );
   }
 }
 
 class MyHomePage extends StatefulWidget {
-  MyHomePage({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
   _MyHomePageState createState() => _MyHomePageState();
 }
 
 class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
 
-  void _incrementCounter() {
+  final List<Transaction> _userTransactions = [
+    // Transaction(id: '1', title: 'New Shoe', amount: 60, date: DateTime.now()),
+    // Transaction(
+    //     id: '2',
+    //     title: 'Weekly groceries',
+    //     amount: 54.99,
+    //     date: DateTime.now()), 
+    // Transaction(
+    //     id: '3', title: 'Phone bill', amount: 19.99, date: DateTime.now()),
+    // Transaction(
+    //     id: '4', title: 'Internet', amount: 29.99, date: DateTime.now()),
+  ];
+
+  List<Transaction> get _recentTransactions {
+    return _userTransactions.where((tx){
+      return tx.date.isAfter(DateTime.now().subtract(Duration(days:7)));
+    }).toList();
+  }
+
+  void _addNewTransaction(String title, double amount, DateTime chosenDate){
+    final newTx = Transaction(
+      title: title, 
+      amount: amount, 
+      date: chosenDate,
+      id: DateTime.now().toString(),
+    );
     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++;
+      _userTransactions.add(newTx);
+    });
+  }
+
+  void _deleteTransaction(String id){
+    setState(() {
+      _userTransactions.removeWhere((tx) => tx.id == id);
+    });
+
+  }
+
+  void _startAddNewTransaction(BuildContext ctx){
+    showModalBottomSheet(context: ctx, builder: (_){
+      return NewTransaction(_addNewTransaction);
     });
   }
 
   @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>[
-            Text(
-              'You have pushed the button this many times:',
-            ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.display1,
-            ),
-          ],
+        title: Text(
+          'Personal Expenses',
+          style: TextStyle(
+            fontFamily: 'OpenSans'
+          ),
         ),
+        actions: <Widget>[
+          IconButton(icon: Icon(Icons.add,), onPressed:()=>_startAddNewTransaction(context),),
+        ],
+      ),
+      body: SingleChildScrollView(
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.start,
+                crossAxisAlignment: CrossAxisAlignment.center,
+                children: <Widget>[
+                  Chart(_recentTransactions),
+                  TransactionList(_userTransactions, _deleteTransaction),
+                ],
+              ),
       ),
+      floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
       floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
         child: Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
+        onPressed: ()=>_startAddNewTransaction(context),
+      ),      
     );
   }
 }

lib/models/transaction.dart

@@ -0,0 +1,16 @@
+import 'package:flutter/foundation.dart';
+
+class Transaction{
+  final String id;
+  final String title;
+  final double amount;
+  final DateTime date;
+
+  Transaction({
+    @required this.id, 
+    @required this.title, 
+    @required this.amount, 
+    @required this.date
+  });
+
+}

lib/widgets/chart.dart

@@ -0,0 +1,64 @@
+import '../models/transaction.dart';
+import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+import './chart_bar.dart';
+
+class Chart extends StatelessWidget {
+  final List<Transaction> recentTransactions;
+
+  Chart(this.recentTransactions);
+
+  List<Map<String, Object>> get groupedTransactionValues {
+    return List.generate(7, (index) {
+      final weekday = DateTime.now().subtract(
+        Duration(days: index),
+      );
+      var totalSum = 0.0;
+
+      for (var i = 0; i < recentTransactions.length; i++) {
+        if (recentTransactions[i].date.day == weekday.day &&
+            recentTransactions[i].date.month == weekday.month &&
+            recentTransactions[i].date.year == weekday.year) {
+          totalSum += recentTransactions[i].amount;
+        }
+      }
+
+      return {
+        'day': DateFormat.E().format(weekday).substring(0, 1),
+        'amount': totalSum
+      };
+    }).reversed.toList();
+  }
+
+  double get totalSpending {
+    return groupedTransactionValues.fold(0.0, (sum, item) {
+      return sum + item['amount'];
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    print(groupedTransactionValues);
+    return Card(
+      elevation: 6,
+      margin: EdgeInsets.all(20),
+      child: Container(
+        padding: EdgeInsets.all(10),
+        child: Row(
+          mainAxisAlignment: MainAxisAlignment.spaceBetween,
+          children: groupedTransactionValues.map((tx) {
+            print(totalSpending == 0.0 ? 0.0 : (tx['amount'] as double) / totalSpending);
+            return Flexible(
+                    fit: FlexFit.tight,
+                    child: ChartBar(
+                      tx['day'], 
+                      tx['amount'],
+                      totalSpending == 0.0 ? 0.0 : (tx['amount'] as double) / totalSpending,
+                    ),
+            );
+          }).toList(),
+        ),
+      ),
+    );
+  }
+}

lib/widgets/chart_bar.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+
+class ChartBar extends StatelessWidget {
+  final String label;
+  final double spendingAmount;
+  final double spendingPctOfTotal;
+
+  ChartBar(this.label, this.spendingAmount, this.spendingPctOfTotal);
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: <Widget>[
+        Container(
+          height: 20,
+          child: FittedBox(
+            child: Text('\$${spendingAmount.toStringAsFixed(0)}'),
+          ),
+        ),
+        SizedBox(
+          height: 4,
+        ),
+        Container(
+          height: 60,
+          width: 10,
+          child: Stack(
+            children: <Widget>[
+              Container(
+                decoration: BoxDecoration(
+                  border: Border.all(color: Colors.grey, width: 1.0),
+                  color: Color.fromRGBO(220, 220, 220, 1),
+                  borderRadius: BorderRadius.circular(10),
+                ),
+              ),
+              FractionallySizedBox(
+                heightFactor: spendingPctOfTotal,
+                child: Container(
+                  decoration: BoxDecoration(
+                    color: Theme.of(context).primaryColor,
+                    borderRadius: BorderRadius.circular(10),
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
+        SizedBox(
+          height: 4,
+        ),
+        Text(label)
+      ],
+    );
+  }
+}