Throttle selectPoints #2040
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,36 @@ | ||
| /** | ||
| * Copyright 2012-2017, Plotly, Inc. | ||
| * All rights reserved. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| 'use strict'; | ||
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| /** | ||
| * Allow referencing a graph DOM element either directly | ||
| * or by its id string | ||
| * | ||
| * @param {HTMLDivElement|string} gd: a graph element or its id | ||
| * | ||
| * @returns {HTMLDivElement} the DOM element of the graph | ||
| */ | ||
| module.exports = function(gd) { | ||
| var gdElement; | ||
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| if(typeof gd === 'string') { | ||
| gdElement = document.getElementById(gd); | ||
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| if(gdElement === null) { | ||
| throw new Error('No DOM element with id \'' + gd + '\' exists on the page.'); | ||
| } | ||
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| return gdElement; | ||
| } | ||
| else if(gd === null || gd === undefined) { | ||
| throw new Error('DOM element provided is null or undefined'); | ||
| } | ||
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| return gd; // otherwise assume that gd is a DOM element | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| /** | ||
| * Copyright 2012-2017, Plotly, Inc. | ||
| * All rights reserved. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| 'use strict'; | ||
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| var timerCache = {}; | ||
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| /** | ||
| * Throttle a callback. `callback` executes synchronously only if | ||
| * more than `minInterval` milliseconds have already elapsed since the latest | ||
| * call (if any). Otherwise we wait until `minInterval` is over and execute the | ||
| * last callback received while waiting. | ||
| * So the first and last events in a train are always executed (eventually) | ||
| * but some of the events in the middle can be dropped. | ||
| * | ||
| * @param {string} id: an identifier to mark events to throttle together | ||
| * @param {number} minInterval: minimum time, in milliseconds, between | ||
| * invocations of `callback` | ||
| * @param {function} callback: the function to throttle. `callback` itself | ||
| * should be a purely synchronous function. | ||
| */ | ||
| exports.throttle = function throttle(id, minInterval, callback) { | ||
| var cache = timerCache[id]; | ||
| var now = Date.now(); | ||
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| if(!cache) { | ||
| /* | ||
| * Throw out old items before making a new one, to prevent the cache | ||
| * getting overgrown, for example from old plots that have been replaced. | ||
| * 1 minute age is arbitrary. | ||
| */ | ||
| for(var idi in timerCache) { | ||
| if(timerCache[idi].ts < now - 60000) { | ||
| delete timerCache[idi]; | ||
| } | ||
| } | ||
| cache = timerCache[id] = {ts: 0, timer: null}; | ||
| } | ||
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| _clearTimeout(cache); | ||
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| function exec() { | ||
| callback(); | ||
|
There was a problem hiding this comment. So |
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| cache.ts = Date.now(); | ||
| if(cache.onDone) { | ||
| cache.onDone(); | ||
| cache.onDone = null; | ||
| } | ||
| } | ||
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| if(now > cache.ts + minInterval) { | ||
| exec(); | ||
| return; | ||
| } | ||
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| cache.timer = setTimeout(function() { | ||
| exec(); | ||
| cache.timer = null; | ||
| }, minInterval); | ||
| }; | ||
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| exports.done = function(id) { | ||
| var cache = timerCache[id]; | ||
| if(!cache || !cache.timer) return Promise.resolve(); | ||
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| return new Promise(function(resolve) { | ||
| var previousOnDone = cache.onDone; | ||
| cache.onDone = function onDone() { | ||
| if(previousOnDone) previousOnDone(); | ||
| resolve(); | ||
| cache.onDone = null; | ||
| }; | ||
| }); | ||
| }; | ||
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| /** | ||
| * Clear the throttle cache for one or all timers | ||
| * @param {optional string} id: | ||
| * if provided, clear just this timer | ||
| * if omitted, clear all timers (mainly useful for testing) | ||
| */ | ||
| exports.clear = function(id) { | ||
| if(id) { | ||
| _clearTimeout(timerCache[id]); | ||
| delete timerCache[id]; | ||
| } | ||
| else { | ||
| for(var idi in timerCache) exports.clear(idi); | ||
| } | ||
| }; | ||
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| function _clearTimeout(cache) { | ||
| if(cache && cache.timer !== null) { | ||
| clearTimeout(cache.timer); | ||
| cache.timer = null; | ||
| } | ||
| } | ||
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NIce 🌴