1 files changed, 119 insertions, 0 deletions
diff --git a/lib/home.dart b/lib/home.dart
new file mode 100644
index 0000000..0235016
--- /dev/null
+++ b/lib/home.dart
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+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:geolocator/geolocator.dart';
+
+import 'main.dart';
+import 'about.dart';
+
+extension on SpeedUnit {
+  double fromMetersPerSecond(double metersPerSecond) => switch (this) {
+    SpeedUnit.kilometersPerHour => metersPerSecond * 3.6,
+    SpeedUnit.milesPerHour => metersPerSecond * 2.236936,
+  };
+
+  String get acronym => switch (this) {
+    SpeedUnit.kilometersPerHour => 'kmph',
+    SpeedUnit.milesPerHour => 'mph',
+  };
+}
+
+class HomePage extends StatefulWidget {
+  const HomePage({super.key});
+
+  @override
+  State<HomePage> createState() => _HomePageState();
+}
+
+class _HomePageState extends State<HomePage> {
+  StreamSubscription<Position>? _positionStream;
+  double _speed = 0.0;
+  double _speedAccuracy = 0.0;
+  SpeedUnit _speedUnit = SpeedUnit.milesPerHour;
+  LocationSettings _locationSettings = LocationSettings();
+
+  void _initPositionStream() {
+    _positionStream =
+        Geolocator.getPositionStream(
+          locationSettings: _locationSettings,
+        ).listen((Position? position) {
+          if (position != null) {
+            setState(() {
+              _speed = position.speed;
+              _speedAccuracy = position.speedAccuracy;
+            });
+          }
+        });
+  }
+
+  @override
+  void initState() {
+    super.initState();
+
+    Geolocator.checkPermission()
+        .then(
+          (permission) => permission == LocationPermission.denied
+              ? Geolocator.requestPermission()
+              : permission,
+        )
+        .then((permission) {
+          if (![
+            LocationPermission.deniedForever,
+            LocationPermission.denied,
+          ].contains(permission)) {
+            _initPositionStream();
+          }
+        });
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+    _positionStream?.cancel();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        actions: [
+          MenuAnchor(
+            builder: (context, controller, child) => IconButton(
+              icon: Icon(Icons.more_vert),
+              onPressed: () =>
+                  controller.isOpen ? controller.close() : controller.open(),
+              tooltip: "Navigation menu",
+            ),
+            menuChildren: [
+              MenuItemButton(child: Text('Settings')),
+              MenuItemButton(
+                child: Text('About'),
+                onPressed: () => Navigator.push(
+                  context,
+                  MaterialPageRoute(builder: (context) => AboutPage()),
+                ),
+              ),
+            ],
+          ),
+        ],
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          crossAxisAlignment: CrossAxisAlignment.center,
+          children: [
+            Flex(direction: Axis.horizontal),
+            Text(
+              '${_speedUnit.fromMetersPerSecond(_speed).round()} ${_speedUnit.acronym}',
+              style: Theme.of(context).textTheme.displayLarge,
+            ),
+            Text(
+              '± ${_speedUnit.fromMetersPerSecond(_speedAccuracy).round()} ${_speedUnit.acronym}',
+              style: Theme.of(context).textTheme.displaySmall,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}