konami_code_trigger.dart

import 'package:flutter/material.dart';
import 'package:collection/collection.dart';
import 'package:rxdart/rxdart.dart';
import 'package:simple_gesture_detector/simple_gesture_detector.dart';

enum _Kode { left, right, tap, longPress }

const List<_Kode> _konamiCode = [_Kode.left, _Kode.right, _Kode.left, _Kode.right, _Kode.tap, _Kode.longPress];

class KonamiCodeTrigger extends StatefulWidget {
  final VoidCallback action;
  final Widget child;

  KonamiCodeTrigger({required this.action, required this.child});

  @override
  _KonamiCodeTriggerState createState() => _KonamiCodeTriggerState();
}

class _KonamiCodeTriggerState extends State<KonamiCodeTrigger> {
  ReplaySubject<_Kode> codes = ReplaySubject(maxSize: _konamiCode.length);

  _KonamiCodeTriggerState() {
    codes //
        .bufferCount(_konamiCode.length, 1)
        .where((actualCode) => const IterableEquality<_Kode>().equals(actualCode, _konamiCode))
        .listen((_) => widget.action());
  }

  @override
  Widget build(BuildContext context) {
    return SimpleGestureDetector(
      onHorizontalSwipe: (d) => d == SwipeDirection.left ? codes.add(_Kode.left) : codes.add(_Kode.right),
      onTap: () => codes.add(_Kode.tap),
      onLongPress: () => codes.add(_Kode.longPress),
      child: widget.child,
    );
  }
}