hacky virtual navigation

native_page.dart

import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';

void navigate(BuildContext context) {
  Navigator.push<void>(
    context,
    NativePageRoute(
      onPush: () => openAppSetttings(),
      onResume: () => Future.value(),
    ),
  );
}

class NativePageRoute<T> extends PageRoute<T> {
  /// Creates a route that delegates to builder callbacks.
  NativePageRoute({
    required this.onPush,
    required this.onResume,
    super.settings,
    this.maintainState = true,
    super.fullscreenDialog,
    super.allowSnapshotting = true,
  });

  final VoidCallback onPush;
  final Future<T> Function() onResume;

  @override
  final Duration transitionDuration = Duration.zero;

  @override
  final Duration reverseTransitionDuration = Duration.zero;

  @override
  final bool opaque = false;

  @override
  final bool barrierDismissible = false;

  @override
  final Color? barrierColor = null;

  @override
  final String? barrierLabel = null;

  @override
  final bool maintainState;

  @override
  Widget buildPage(
    BuildContext context,
    Animation<double> animation,
    Animation<double> secondaryAnimation,
  ) {
    return NativePage(
      onPush: onPush,
      onResume: onResume,
    );
  }

  @override
  Widget buildTransitions(
    BuildContext context,
    Animation<double> animation,
    Animation<double> secondaryAnimation,
    Widget child,
  ) {
    return child;
  }
}

class NativePage<T> extends StatefulWidget {
  const NativePage({super.key, required this.onPush, required this.onResume});

  final VoidCallback onPush;
  final Future<T> Function() onResume;

  @override
  State<NativePage> createState() => _NativePageState();
}

class _NativePageState extends State<NativePage> {
  late final AppLifecycleListener _listener;

  @override
  void initState() {
    super.initState();

    _listener = AppLifecycleListener(onResume: _onResume);
    widget.onPush();
  }

  @override
  void dispose() {
    _listener.dispose();
    super.dispose();
  }

  void _onResume() async {
    final t = await widget.onResume();
    if (context.mounted) {
      Navigator.pop(context, t);
    }
  }

  @override
  Widget build(BuildContext context) {
    return const SizedBox.shrink();
  }
}