153 lines
3.8 KiB
JavaScript
153 lines
3.8 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.throttle = throttle;
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exports.debounce = debounce;
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var _Stream = require('../Stream');
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var _Stream2 = _interopRequireDefault(_Stream);
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var _Pipe = require('../sink/Pipe');
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var _Pipe2 = _interopRequireDefault(_Pipe);
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var _Map = require('../fusion/Map');
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var _Map2 = _interopRequireDefault(_Map);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Limit the rate of events by suppressing events that occur too often
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* @param {Number} period time to suppress events
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* @param {Stream} stream
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* @returns {Stream}
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*/
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function throttle(period, stream) {
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return new _Stream2.default(throttleSource(period, stream.source));
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} /** @license MIT License (c) copyright 2010-2016 original author or authors */
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/** @author Brian Cavalier */
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/** @author John Hann */
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function throttleSource(period, source) {
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return source instanceof _Map2.default ? commuteMapThrottle(period, source) : source instanceof Throttle ? fuseThrottle(period, source) : new Throttle(period, source);
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}
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function commuteMapThrottle(period, source) {
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return _Map2.default.create(source.f, throttleSource(period, source.source));
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}
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function fuseThrottle(period, source) {
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return new Throttle(Math.max(period, source.period), source.source);
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}
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function Throttle(period, source) {
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this.period = period;
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this.source = source;
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}
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Throttle.prototype.run = function (sink, scheduler) {
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return this.source.run(new ThrottleSink(this.period, sink), scheduler);
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};
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function ThrottleSink(period, sink) {
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this.time = 0;
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this.period = period;
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this.sink = sink;
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}
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ThrottleSink.prototype.event = function (t, x) {
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if (t >= this.time) {
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this.time = t + this.period;
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this.sink.event(t, x);
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}
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};
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ThrottleSink.prototype.end = _Pipe2.default.prototype.end;
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ThrottleSink.prototype.error = _Pipe2.default.prototype.error;
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/**
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* Wait for a burst of events to subside and emit only the last event in the burst
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* @param {Number} period events occurring more frequently than this
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* will be suppressed
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* @param {Stream} stream stream to debounce
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* @returns {Stream} new debounced stream
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*/
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function debounce(period, stream) {
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return new _Stream2.default(new Debounce(period, stream.source));
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}
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function Debounce(dt, source) {
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this.dt = dt;
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this.source = source;
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}
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Debounce.prototype.run = function (sink, scheduler) {
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return new DebounceSink(this.dt, this.source, sink, scheduler);
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};
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function DebounceSink(dt, source, sink, scheduler) {
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this.dt = dt;
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this.sink = sink;
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this.scheduler = scheduler;
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this.value = void 0;
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this.timer = null;
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this.disposable = source.run(this, scheduler);
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}
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DebounceSink.prototype.event = function (t, x) {
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this._clearTimer();
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this.value = x;
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this.timer = this.scheduler.delay(this.dt, new DebounceTask(this, x));
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};
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DebounceSink.prototype._event = function (t, x) {
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this._clearTimer();
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this.sink.event(t, x);
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};
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DebounceSink.prototype.end = function (t, x) {
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if (this._clearTimer()) {
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this.sink.event(t, this.value);
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this.value = void 0;
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}
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this.sink.end(t, x);
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};
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DebounceSink.prototype.error = function (t, x) {
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this._clearTimer();
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this.sink.error(t, x);
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};
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DebounceSink.prototype.dispose = function () {
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this._clearTimer();
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return this.disposable.dispose();
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};
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DebounceSink.prototype._clearTimer = function () {
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if (this.timer === null) {
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return false;
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}
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this.timer.dispose();
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this.timer = null;
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return true;
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};
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function DebounceTask(debounce, value) {
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this.debounce = debounce;
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this.value = value;
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}
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DebounceTask.prototype.run = function (t) {
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this.debounce._event(t, this.value);
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};
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DebounceTask.prototype.error = function (t, e) {
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this.debounce.error(t, e);
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};
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DebounceTask.prototype.dispose = function () {}; |