зеркало из https://github.com/mozilla/gecko-dev.git
46 строки
1.2 KiB
JavaScript
46 строки
1.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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/**
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* Create a debouncing function wrapper to only call the target function after a certain
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* amount of time has passed without it being called.
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*
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* @param {Function} func
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* The function to debounce
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* @param {number} wait
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* The wait period
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* @param {Object} scope
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* The scope to use for func
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* @return {Function} The debounced function, which has a `cancel` method that the
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* consumer can call to cancel any pending setTimeout callback.
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*/
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exports.debounce = function(func, wait, scope) {
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let timer = null;
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function clearTimer(resetTimer = false) {
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if (timer) {
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clearTimeout(timer);
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}
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if (resetTimer) {
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timer = null;
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}
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}
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const debouncedFunction = function() {
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clearTimer();
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const args = arguments;
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timer = setTimeout(function() {
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timer = null;
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func.apply(scope, args);
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}, wait);
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};
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debouncedFunction.cancel = clearTimer.bind(null, true);
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return debouncedFunction;
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};
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