import 'dart:async';

import 'package:flutter/material.dart';


ScaffoldFeatureController<SnackBar, SnackBarClosedReason> notifyUserX(ScaffoldMessengerState sm, String message, { int delaySeconds = 3 }) 
{
  return sm.showSnackBar(
    SnackBar(
      content: Text(message),
      duration: Duration(seconds: delaySeconds),
    ),
  );
}

ScaffoldFeatureController<SnackBar, SnackBarClosedReason> notifyUser(BuildContext context, String message, { int delaySeconds = 3 }) {
  return notifyUserX(ScaffoldMessenger.of(context), message, delaySeconds: delaySeconds);
}

Future<ScaffoldFeatureController<SnackBar, SnackBarClosedReason>> postNotifyUser(
  BuildContext context, String message, {int delaySeconds = 3}) {

  final completer = Completer<ScaffoldFeatureController<SnackBar, SnackBarClosedReason>>();

  WidgetsBinding.instance.addPostFrameCallback((_) {
    final controller = notifyUser(context, message, delaySeconds: delaySeconds);
    completer.complete(controller);
  });

  return completer.future;
}