Add sqlite dependency with flutter pub add sqflite.

lib/main.dart

@@ -41,6 +41,10 @@ class HomePage extends StatefulWidget {
 class _HomePageState extends State<HomePage> {
   var pageSelected = 0;
 
+  refresh() {
+    setState(() {});
+  }
+
   @override
   Widget build(BuildContext context) {
     Widget page;
@@ -48,7 +52,9 @@ class _HomePageState extends State<HomePage> {
     switch (pageSelected) {
       case 0:
         page = ExpensePage();
-        dialog = ExpenseInputDialog();
+        dialog = ExpenseInputDialog(
+          notifyParent: refresh,
+        );
       case 1:
         page = IncomePage();
       case 2:
@@ -79,49 +85,42 @@ class _HomePageState extends State<HomePage> {
 
     return LayoutBuilder(builder: (context, constraints) {
       return Scaffold(
-        // TODO: Add a drawer instead of nav rail.
+        appBar: AppBar(title: Text("Expense Tracker")),
-        body: Row(
+        drawer: NavigationRail(
-          children: [
+          extended: constraints.maxWidth >= 800,
-            SafeArea(
+          destinations: [
-              child: NavigationRail(
+            NavigationRailDestination(
-                extended: constraints.maxWidth >= 800,
+              icon: Icon(Icons.payment),
-                destinations: [
+              label: Text('Expenses'),
-                  NavigationRailDestination(
-                    icon: Icon(Icons.payment),
-                    label: Text('Expenses'),
-                  ),
-                  NavigationRailDestination(
-                    icon: Icon(Icons.account_balance),
-                    label: Text('Income'),
-                  ),
-                  NavigationRailDestination(
-                    icon: Icon(Icons.attach_money),
-                    label: Text('Liquid Assets'),
-                  ),
-                  NavigationRailDestination(
-                    icon: Icon(Icons.bar_chart),
-                    label: Text('Projections'),
-                  ),
-                  NavigationRailDestination(
-                    icon: Icon(Icons.settings),
-                    label: Text('Settings'),
-                  ),
-                ],
-                selectedIndex: pageSelected,
-                onDestinationSelected: (value) {
-                  setState(() {
-                    pageSelected = value;
-                  });
-                },
-              ),
             ),
-            Expanded(
+            NavigationRailDestination(
-              child: Container(
+              icon: Icon(Icons.account_balance),
-                color: Theme.of(context).colorScheme.primaryContainer,
+              label: Text('Income'),
-                child: page,
+            ),
-              ),
+            NavigationRailDestination(
+              icon: Icon(Icons.attach_money),
+              label: Text('Liquid Assets'),
+            ),
+            NavigationRailDestination(
+              icon: Icon(Icons.bar_chart),
+              label: Text('Reports'),
+            ),
+            NavigationRailDestination(
+              icon: Icon(Icons.settings),
+              label: Text('Settings'),
             ),
           ],
+          selectedIndex: pageSelected,
+          onDestinationSelected: (value) {
+            setState(() {
+              pageSelected = value;
+              Navigator.pop(context);
+            });
+          },
+        ),
+        body: Container(
+          color: Theme.of(context).colorScheme.primaryContainer,
+          child: Center(child: page),
         ),
         floatingActionButton: floatingButton,
       );

lib/pages/expense.dart

@@ -12,48 +12,39 @@ class ExpensePage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return ListView.builder(
+    return expenses.isEmpty
-        itemCount: expenses.length,
+        ? Text("Add expenses to get started!")
-        itemBuilder: (_, index) {
+        : ListView.builder(
-          final Expense curr = expenses[index];
+            itemCount: expenses.length,
-          return Center(
+            itemBuilder: (_, index) {
-            child: Padding(
+              final Expense curr = expenses[index];
-              padding: const EdgeInsets.all(4.0),
+              return Center(
-              child: Container(
+                child: Padding(
-                decoration: BoxDecoration(
+                  padding: const EdgeInsets.all(4.0),
-                  borderRadius: BorderRadius.circular(4),
+                  child: Container(
-                  color: Colors.greenAccent,
+                    decoration: BoxDecoration(
+                      borderRadius: BorderRadius.circular(4),
+                      color: Colors.greenAccent,
+                    ),
+                    child: Column(
+                      children: [
+                        Text(curr.name),
+                        Text("${curr.cost.toString()} ${curr.frequency.title}"),
+                      ],
+                    ),
+                  ),
                 ),
-                child: Column(
+              );
-                  children: [
+            },
-                    Text(curr.name),
-                    Text("${curr.cost.toString()} ${curr.frequency.title}"),
-                  ],
-                ),
-              ),
-            ),
           );
-        });
-    /*
-    return ListView(
-      children: [
-        ListTile(
-          title: Text("Fake Item 1"),
-          subtitle: Text("30.00 / month"),
-        ),
-        ListTile(
-          title: Text("Fake Item 2"),
-          subtitle: Text("180.00 / year"),
-        ),
-      ],
-    );
-    */
   }
 }
 
 class ExpenseInputDialog extends StatefulWidget {
+  final Function() notifyParent;
   const ExpenseInputDialog({
     super.key,
+    required this.notifyParent,
   });
 
   @override
@@ -70,9 +61,6 @@ class _ExpenseInputDialogState extends State<ExpenseInputDialog> {
 
   @override
   Widget build(BuildContext context) {
-    const inputWidth = 300.0;
-    const inputHeight = 50.0;
-
     List<DropdownMenuItem> freqValues = [];
     for (var freq in Frequency.values) {
       freqValues.add(DropdownMenuItem(value: freq, child: Text(freq.title)));
@@ -83,130 +71,112 @@ class _ExpenseInputDialogState extends State<ExpenseInputDialog> {
       title: Center(child: Text("Add New Expense")),
       content: Form(
         key: _expenseFormKey,
-        autovalidateMode: AutovalidateMode.onUserInteraction,
+        //autovalidateMode: AutovalidateMode.onUserInteraction,
         child: Column(mainAxisSize: MainAxisSize.min, spacing: 10, children: [
-          SizedBox(
+          TextFormField(
-            width: inputWidth,
+            keyboardType: TextInputType.text,
-            height: inputHeight,
+            decoration: InputDecoration(
-            child: TextFormField(
+              labelText: "Name",
-              keyboardType: TextInputType.text,
+              hintText: "Example: Red Pocket Phone Bill",
-              decoration: InputDecoration(
-                labelText: "Name",
-                hintText: "Example: Red Pocket Phone Bill",
-              ),
-              validator: (value) {
-                if (value!.isEmpty) {
-                  return "Name must be provided.";
-                }
-                return null;
-              },
-              onSaved: (newValue) {
-                _name = newValue!;
-              },
             ),
+            validator: (value) {
+              if (value!.isEmpty) {
+                return "Name must be provided.";
+              }
+              return null;
+            },
+            onSaved: (newValue) {
+              _name = newValue!;
+            },
           ),
-          SizedBox(
+          TextFormField(
-            width: inputWidth,
+            keyboardType: TextInputType.numberWithOptions(decimal: true),
-            height: inputHeight,
+            decoration:
-            child: TextFormField(
+                InputDecoration(labelText: "Cost", hintText: "Example: 10.00"),
-              keyboardType: TextInputType.numberWithOptions(decimal: true),
+            validator: (value) {
-              decoration: InputDecoration(
+              if (value!.isEmpty) {
-                  labelText: "Cost", hintText: "Example: 10.00"),
+                return "Cost must be provided.";
-              validator: (value) {
+              }
-                if (value!.isEmpty) {
+              if (double.tryParse(value) == null) {
-                  return "Cost must be provided.";
+                return "Cost must be a valid number.";
-                }
+              }
-                if (double.tryParse(value) == null) {
+              return null;
-                  return "Cost must be a valid number.";
+            },
-                }
+            onSaved: (newValue) {
-                return null;
+              _cost = double.parse(newValue!);
-              },
+            },
-              onSaved: (newValue) {
-                _cost = double.parse(newValue!);
-              },
-            ),
           ),
-          SizedBox(
+          DropdownButtonFormField(
-            width: inputWidth,
+            items: freqValues,
-            height: inputHeight,
+            decoration: InputDecoration(
-            child: DropdownButtonFormField(
+                labelText: "Recurrence", hintText: "Example: Monthly"),
-              items: freqValues,
+            validator: (value) {
-              decoration: InputDecoration(
+              if (value == null) {
-                  labelText: "Recurrence", hintText: "Example: Monthly"),
+                return "Frequency must be provided.";
-              validator: (value) {
+              }
-                if (value == null) {
+              if (!Frequency.values.contains(value)) {
-                  return "Frequency must be provided.";
+                return "Value not valid.";
-                }
+              }
-                if (!Frequency.values.contains(value)) {
+              return null;
-                  return "Value not valid.";
+            },
-                }
+            onChanged: (newValue) {
-                return null;
+              _freq = newValue;
-              },
+            },
-              onChanged: (newValue) {
-                _freq = newValue;
-              },
-            ),
           ),
-          SizedBox(
+          TextFormField(
-            width: inputWidth,
+            keyboardType: TextInputType.text,
-            height: inputHeight,
+            decoration: InputDecoration(
-            child: TextFormField(
+                labelText: "Description",
-              keyboardType: TextInputType.text,
+                hintText: "Example: 1GB data with unlimited talk & text."),
-              decoration: InputDecoration(
+            validator: (value) {
-                  labelText: "Description",
+              return null;
-                  hintText: "Example: 1GB data with unlimited talk & text."),
+            },
-              validator: (value) {
+            onSaved: (newValue) {
-                return null;
+              _desc = newValue!;
-              },
+            },
-              onSaved: (newValue) {
-                _desc = newValue!;
-              },
-            ),
           ),
         ]),
       ),
       actions: [
-        SizedBox(
+        Row(
-          width: inputWidth,
+          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
-          height: inputHeight,
+          crossAxisAlignment: CrossAxisAlignment.center,
-          child: Row(
+          children: [
-            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+            ElevatedButton.icon(
-            crossAxisAlignment: CrossAxisAlignment.center,
+              onPressed: () {
-            children: [
+                print("TODO: Clear fields!");
-              ElevatedButton.icon(
+                Navigator.of(context).pop();
-                onPressed: () {
+              },
-                  print("TODO: Clear fields!");
+              icon: Icon(Icons.cancel),
-                  Navigator.of(context).pop();
+              label: Text('Cancel'),
-                },
+            ),
-                icon: Icon(Icons.cancel),
+            ElevatedButton.icon(
-                label: Text('Cancel'),
+              onPressed: () {
-              ),
+                print("TODO: Save expense!");
-              ElevatedButton.icon(
+                if (_expenseFormKey.currentState!.validate()) {
-                onPressed: () {
+                  _expenseFormKey.currentState!.save();
-                  print("TODO: Save expense!");
+                  setState(() {
-                  if (_expenseFormKey.currentState!.validate()) {
+                    expenses.add(
-                    _expenseFormKey.currentState!.save();
+                      Expense(
-                    setState(() {
+                          name: _name,
-                      expenses.add(
+                          cost: _cost,
-                        Expense(
+                          frequency: _freq,
-                            name: _name,
+                          description: _desc),
-                            cost: _cost,
+                    );
-                            frequency: _freq,
+                  });
-                            description: _desc),
+                  widget.notifyParent();
-                      );
+
-                    });
+                  print(expenses.toString());
-                    print(expenses.toString());
+                  for (var expense in expenses) {
-                    for (var expense in expenses) {
+                    print(expense.toString());
-                      print(expense.toString());
-                    }
-                    Navigator.of(context).pop();
                   }
-                },
+                  Navigator.of(context).pop();
-                icon: Icon(Icons.save),
+                }
-                label: Text('Submit'),
+              },
-              ),
+              icon: Icon(Icons.save),
-            ],
+              label: Text('Submit'),
-          ),
+            ),
+          ],
         )
       ],
     );

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -5,6 +5,8 @@
 import FlutterMacOS
 import Foundation
 
+import sqflite_darwin
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
+  SqflitePlugin.register(with: registry.registrar(forPlugin: "SqflitePlugin"))
 }

pubspec.lock

@@ -131,6 +131,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      sha256: "5d6b1b0036a5f331ebc77c850ebc8506cbc1e9416c27e59b439f917a902a4984"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.6"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.8"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -144,6 +160,46 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.10.0"
+  sqflite:
+    dependency: "direct main"
+    description:
+      name: sqflite
+      sha256: "2d7299468485dca85efeeadf5d38986909c5eb0cd71fd3db2c2f000e6c9454bb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  sqflite_android:
+    dependency: transitive
+    description:
+      name: sqflite_android
+      sha256: "78f489aab276260cdd26676d2169446c7ecd3484bbd5fead4ca14f3ed4dd9ee3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.0"
+  sqflite_common:
+    dependency: transitive
+    description:
+      name: sqflite_common
+      sha256: "761b9740ecbd4d3e66b8916d784e581861fd3c3553eda85e167bc49fdb68f709"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.4+6"
+  sqflite_darwin:
+    dependency: transitive
+    description:
+      name: sqflite_darwin
+      sha256: "22adfd9a2c7d634041e96d6241e6e1c8138ca6817018afc5d443fef91dcefa9c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1+1"
+  sqflite_platform_interface:
+    dependency: transitive
+    description:
+      name: sqflite_platform_interface
+      sha256: "8dd4515c7bdcae0a785b0062859336de775e8c65db81ae33dd5445f35be61920"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.0"
   stack_trace:
     dependency: transitive
     description:
@@ -168,6 +224,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.0"
+  synchronized:
+    dependency: transitive
+    description:
+      name: synchronized
+      sha256: "69fe30f3a8b04a0be0c15ae6490fc859a78ef4c43ae2dd5e8a623d45bfcf9225"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.3.0+3"
   term_glyph:
     dependency: transitive
     description:
@@ -202,4 +266,4 @@ packages:
     version: "14.3.0"
 sdks:
   dart: ">=3.6.1 <4.0.0"
-  flutter: ">=3.18.0-18.0.pre.54"
+  flutter: ">=3.24.0"

pubspec.yaml

@@ -9,6 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  sqflite: ^2.4.1
 
 dev_dependencies:
   flutter_test: