29 lines
793 B
JavaScript
29 lines
793 B
JavaScript
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// Ported from nanoraf 3.1.0 (MIT) — https://github.com/choojs/nanoraf
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// Only call requestAnimationFrame when needed.
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import { ok, equal } from './assert.js'
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export default function nanoraf (render, raf) {
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equal(typeof render, 'function', 'nanoraf: render should be a function')
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ok(typeof raf === 'function' || typeof raf === 'undefined', 'nanoraf: raf should be a function or undefined')
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if (!raf) raf = globalThis.requestAnimationFrame
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let redrawScheduled = false
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let args = null
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return function frame (...frameArgs) {
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if (args === null && !redrawScheduled) {
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redrawScheduled = true
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raf(function redraw () {
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redrawScheduled = false
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const _args = args
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args = null
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render(..._args)
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})
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}
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args = frameArgs
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}
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}
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