double_back_for_exit.dart

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

class DoubleBackForExit extends StatelessWidget {
  final Widget child;

  DoubleBackForExit({Key? key, required this.child}) : super(key: key);

  DateTime? latestBackTappedTime;

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () async {
        if (latestBackTappedTime == null ||
            (DateTime.now().millisecondsSinceEpoch -
                    latestBackTappedTime!.millisecondsSinceEpoch) >
                4500) {
          latestBackTappedTime = DateTime.now();
          ScaffoldMessenger.of(context).showSnackBar(SnackBar(
            content: Text(context.tr.tap_again_for_exit),
          ));
        } else {
          return true;
        }
        return false;
      },
      child: child,
    );
  }
}