xiao_pet_tracker/lib/app/view/app.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_blue_plus_windows/flutter_blue_plus_windows.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:forui/forui.dart';
import 'package:xiao_pet_tracker/app_router/app_router.dart';
import 'package:xiao_pet_tracker/bootstrap.dart';
import 'package:xiao_pet_tracker/l10n/l10n.dart';

class AppView extends StatefulWidget {
  const AppView({super.key});

  @override
  State<AppView> createState() => _AppState();
}

class _AppState extends State<AppView> {
  BluetoothAdapterState _adapterState = BluetoothAdapterState.unknown;

  late StreamSubscription<BluetoothAdapterState> _adapterStateStateSubscription;

  @override
  void initState() {
    super.initState();
    _adapterStateStateSubscription =
        FlutterBluePlus.adapterState.listen((state) {
      _adapterState = state;
      if (mounted) {
        setState(() {});
      }
    });
  }

  @override
  void dispose() {
    _adapterStateStateSubscription.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    // Widget screen = _adapterState == BluetoothAdapterState.on
    //     ? const HomePage()
    //     : BluetoothOffScreen(
    //         adapterState: _adapterState,
    //       );

    // only allow portrait orientations
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown,
    ]);

    return MaterialApp.router(
      title: 'Xiao Pet Tracker',
      localizationsDelegates: const [
        AppLocalizations.delegate,
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      // localizationsDelegates: AppLocalizations.localizationsDelegates,
      supportedLocales: AppLocalizations.supportedLocales,
      routerConfig: getIt<AppRouter>().config(),
      theme: ThemeData(),
      darkTheme: ThemeData.dark(),
      builder: (context, child) => FTheme(
        data: MediaQuery.of(context).platformBrightness == Brightness.light
            ? FThemes.zinc.light
            : FThemes.zinc.dark,
        child: child!,
      ),
    );
  }
}

// This observer listens for Bluetooth Off and dismisses the DeviceScreen
class BluetoothAdapterStateObserver extends NavigatorObserver {
  StreamSubscription<BluetoothAdapterState>? _adapterStateSubscription;

  @override
  void didPush(Route route, Route? previousRoute) {
    super.didPush(route, previousRoute);
    if (route.settings.name == '/DeviceScreen') {
      // Start listening to Bluetooth state changes when a new route is pushed
      _adapterStateSubscription ??= FlutterBluePlus.adapterState.listen(
        (state) {
          if (state != BluetoothAdapterState.on) {
            // Pop the current route if Bluetooth is off
            navigator?.pop();
          }
        },
      );
    }
  }

  @override
  void didPop(Route route, Route? previousRoute) {
    super.didPop(route, previousRoute);
    // Cancel the subscription when the route is popped
    _adapterStateSubscription?.cancel();
    _adapterStateSubscription = null;
  }
}