100 lines
1.9 KiB
JavaScript
100 lines
1.9 KiB
JavaScript
/*
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* Copyright (c) 2010-2018 Tim Düsterhus.
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*
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* Use of this software is governed by the Business Source License
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* included in the LICENSE file.
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*
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* Change Date: 2024-11-01
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*
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* On the date above, in accordance with the Business Source
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* License, use of this software will be governed by version 2
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* or later of the General Public License.
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*/
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define([], function () {
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'use strict'
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class Throttler {
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constructor(callback, delay = 125) {
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if (!(typeof callback === 'function')) {
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throw new Error('Callback must be a function.')
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}
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if (delay < 0) {
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throw new Error('Delay must be non-negative.')
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}
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this.callback = callback
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this._delay = delay
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this.hot = false
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this.awaiting = false
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this.timer = null
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this.last = Date.now()
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}
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setTimer() {
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if (this.timer != null) {
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clearTimeout(this.timer)
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}
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this.timer = setTimeout((_) => {
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this.timer = null
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this.hot = false
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if (this.awaiting) {
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this.execute()
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}
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}, this.delay)
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}
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execute() {
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this.awaiting = false
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this.hot = true
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this.last = Date.now()
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this.setTimer()
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this.callback()
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}
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guardedExecute() {
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if (this.hot) {
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this.awaiting = true
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} else {
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this.execute()
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}
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}
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get delay() {
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return this._delay
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}
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set delay(newDelay) {
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if (this.awaiting && Date.now() - this.last > newDelay) {
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this._delay = 0
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this.setTimer()
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} else if (this.timer) {
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this._delay = Math.max(0, newDelay - (Date.now() - this.last))
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this.setTimer()
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}
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this._delay = newDelay
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}
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}
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const throttle = function (callback, delay = 125) {
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const throttler = new Throttler(callback, delay)
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const result = throttler.guardedExecute.bind(throttler)
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result.setDelay = function (newDelay) {
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throttler.delay = newDelay
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}
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result.getDelay = function () {
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return throttler.delay
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}
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return result
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}
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return throttle
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})
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