contextless_navigator_service_sample.dart

import 'package:flutter/material.dart';

class NavigatorService{
  ///The next three lines makes this class a singleton
  ///You may also use a locator to register this class as a singleton
  
  NavigatorService._internal();
  static final NavigatorService _instance = NavigatorService._internal();
  factory NavigatorService() => _instance;
  
  final GlobalKey<NavigatorState> _navKey = GlobalKey<NavigatorState>();

  GlobalKey<NavigatorState> get key => _navKey;

  pushNamed(String routeName, {dynamic arguments}) {
    return _navKey.currentState!.pushNamed(routeName, arguments: arguments);
  }

  pop(value) {
    return _navKey.currentState!.pop(value);
  }

  goBack() {
    return _navKey.currentState!.pop();
  }

  popUntil(String routeName, {dynamic arguments}) {
    return _navKey.currentState!.popUntil(ModalRoute.withName(routeName));
  }

  pushNamedAndRemoveUntil(String routeName, {dynamic arguments}) {
    return _navKey.currentState!.pushNamedAndRemoveUntil(routeName, (route) => false, arguments: arguments);
  }

  pushReplacementNamed(String routeName, {dynamic arguments}) {
    return _navKey.currentState!.pushReplacementNamed(routeName, arguments: arguments);
  }

  BuildContext get context => _navKey.currentState!.context;
}


class DialogService{
  
  ///The next three lines makes this class a singleton
  ///You may also use a locator to register this class as a singleton
  DialogService._internal();
  static final DialogService _instance = DialogService._internal();
  factory DialogService() => _instance;
  
  final NavigatorService _navigatorService = NavigatorService();
  
  
  ///You can also use a dialog here
  showSuccessDialog(String message){
    ScaffoldMessenger.of(_navigatorService.context).showSnackBar(
      SnackBar(
        duration: const Duration(milliseconds: 1000),
        backgroundColor: AppColors.green,
          content: Text(message,
          style: Theme.of(_navigatorService.context).textTheme.headline3!.copyWith(color: Colors.white),
      )),
    );
  }
}