added experimental states class

 import 'dart:async';
 import 'dart:collection';
+import 'package:meta/meta.dart';
+
 import '../rx_core/rx_interface.dart';
 part 'rx_num.dart';
 
@@ -230,6 +232,72 @@ class Rx<T> extends _RxImpl<T> {
   dynamic toJson() => (value as dynamic)?.toJson();
 }
 
+/// It's Experimental class, the Api can be change
+abstract class RxState<T> extends RxInterface<T> {
+  RxState(T initial) {
+    _value = initial;
+  }
+
+  T _value;
+
+  StreamController<T> subject = StreamController<T>.broadcast();
+  final _subscriptions = HashMap<Stream<T>, StreamSubscription>();
+
+  bool get canUpdate => _subscriptions.isNotEmpty;
+
+  @protected
+  T call([T v]) {
+    if (v != null) {
+      value = v;
+    }
+    return value;
+  }
+
+  bool firstRebuild = true;
+
+  void addListener(Stream<T> rxGetx) {
+    if (_subscriptions.containsKey(rxGetx)) {
+      return;
+    }
+    _subscriptions[rxGetx] = rxGetx.listen((data) {
+      subject.add(data);
+    });
+  }
+
+  @protected
+  set value(T val) {
+    if (_value == val && !firstRebuild) return;
+    firstRebuild = false;
+    _value = val;
+    subject.add(_value);
+  }
+
+  /// Returns the current [value]
+  T get value {
+    if (getObs != null) {
+      getObs.addListener(subject.stream);
+    }
+    return _value;
+  }
+
+  Stream<T> get stream => subject.stream;
+
+  StreamSubscription<T> listen(void Function(T) onData,
+          {Function onError, void Function() onDone, bool cancelOnError}) =>
+      stream.listen(onData, onError: onError, onDone: onDone);
+
+  void bindStream(Stream<T> stream) {
+    _subscriptions[stream] = stream.listen((va) => value = va);
+  }
+
+  @protected
+  void change(T newState) {
+    if (newState != _value) {
+      value = newState;
+    }
+  }
+}
+
 extension StringExtension on String {
   /// Returns a `RxString` with [this] `String` as initial value.
   RxString get obs => RxString(this);

 import 'dart:collection';
-
 import 'package:flutter/material.dart';
 import 'package:get_core/get_core.dart';
 import 'package:get_instance/get_instance.dart';
@@ -271,3 +270,36 @@ class Value<T> extends GetxController {
     update();
   }
 }
+
+/// It's Experimental class, the Api can be change
+abstract class GetState<T> extends GetxController {
+  GetState(T initialValue) {
+    _state = initialValue;
+  }
+
+  // StreamController<T> _subject;
+
+  // @override
+  // void onClose() {
+  //   _subject?.close();
+  // }
+
+  // Stream<T> get stream {
+  //   if (_subject == null) {
+  //     _subject = StreamController<T>.broadcast();
+  //   }
+  //   return _subject.stream;
+  // }
+
+  T _state;
+
+  T get state => _state;
+
+  @protected
+  void change(T newState) {
+    if (newState != _state) {
+      _state = newState;
+      update();
+    }
+  }
+}