refactor(data): create layered architecture with core/data/ui packages

- Move constants from lib/config/ to lib/core/constants/ - Move color themes to lib/core/theme/ - Create LocationData domain model in data/models/ - Create lightweight GpsService in data/services/ - Create LocationRepository in data/repositories/ consolidating GpsDataManager business logic (GPS stream, staleness, precision) - Create shared SpeedDisplay widget in ui/shared/ - Defer overlay feature — stubs reserved in ui/features/overlay/
2026-08-23 17:16:43 +09:00
parent 7a58483ba2
commit 44480eb969
10 changed files with 623 additions and 0 deletions
@@ -0,0 +1,81 @@
+import 'dart:async';
+import 'package:flutter/widgets.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import '../../../core/constants/speed_unit.dart';
+import '../../../data/models/location_data.dart';
+import '../../../data/repositories/location_repository.dart';
+
+/// ViewModel for the speedometer UI.
+///
+/// Thin state manager — subscribes to [LocationRepository] and exposes
+/// the current display state to the view. No data-layer logic here.
+class SpeedometerViewModel extends ChangeNotifier {
+  final LocationRepository _repository;
+  final SharedPreferences _prefs;
+
+  SpeedUnit _displayUnit = SpeedUnit.kmh;
+  LocationData _displayData = LocationData(
+    speed: 0.0,
+    heading: -1.0,
+    displaySpeed: '--',
+    displayHeading: 'N/A',
+    isSpeedValid: false,
+    isHeadingValid: false,
+    timestamp: DateTime.now(),
+  );
+
+  LocationData get displayData => _displayData;
+  SpeedUnit get displayUnit => _displayUnit;
+
+  SpeedometerViewModel({
+    required LocationRepository repository,
+    required SharedPreferences prefs,
+  })  : _repository = repository,
+        _prefs = prefs;
+
+  void init() {
+    _repository.locationStream.listen(_onLocationData);
+    _loadSettings();
+  }
+
+  void _onLocationData(LocationData data) {
+    _displayData = data;
+    notifyListeners();
+  }
+
+  Future<void> _loadSettings() async {
+    _displayUnit = _parseSpeedUnit(_prefs.getString('speed_unit') ?? 'km/h');
+    notifyListeners();
+  }
+
+  static SpeedUnit _parseSpeedUnit(String unit) {
+    switch (unit) {
+      case 'mph':
+        return SpeedUnit.mph;
+      case 'kts':
+        return SpeedUnit.knots;
+      default:
+        return SpeedUnit.kmh;
+    }
+  }
+
+  double get displaySpeed {
+    return _displayUnit.convert(_displayData.speed);
+  }
+
+  String get displaySpeedText {
+    return _displayData.displaySpeed;
+  }
+
+  String get displayHeading {
+    return _displayData.displayHeading;
+  }
+
+  bool get isSpeedValid {
+    return _displayData.isSpeedValid;
+  }
+
+  bool get isHeadingValid {
+    return _displayData.isHeadingValid;
+  }
+}