mobx_debouce.dart

import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:mobx/mobx.dart';

class Debounce {
  final Duration delay;
  Timer _timer;

  Debounce(this.delay);

  void call(void Function() action) {
    _timer?.cancel();
    _timer = Timer(delay, action);
  }

  void dispose() {
    _timer?.cancel();
    _timer = null;
  }
}

ReactionDisposer debounceReaction<T>(
    T Function(Reaction) fn, void Function(T) effect,
    {String name,
    @required Duration debounce,
    bool fireImmediately,
    EqualityComparer<T> equals,
    ReactiveContext context,
    void Function(Object, Reaction) onError}) {
  var debounceHandler = Debounce(debounce);
  var reactionDisposer = reaction<T>(
    fn,
    (x) {
      debounceHandler(() {
        print(x);
        effect(x);
      });
    },
    name: name,
    fireImmediately: fireImmediately,
    equals: equals,
    context: context,
    onError: onError,
  );

  return DebounceReactionDisposer(
    reactionDisposer.reaction,
    debounceHandler,
  );
}

class DebounceReactionDisposer extends ReactionDisposer {
  final Debounce _debounce;

  DebounceReactionDisposer(Reaction reaction, this._debounce) : super(reaction);

  @override
  void call() {
    _debounce.dispose();
    super.call();
  }
}