46 lines
1016 B
JavaScript
46 lines
1016 B
JavaScript
import raf from 'raf';
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export default function throttleByAnimationFrame(fn) {
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let requestId;
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const later = args => () => {
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requestId = null;
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fn(...args);
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};
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const throttled = (...args) => {
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if (requestId == null) {
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requestId = raf(later(args));
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}
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};
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throttled.cancel = () => raf.cancel(requestId);
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return throttled;
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}
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export function throttleByAnimationFrameDecorator() {
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return function(target, key, descriptor) {
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const fn = descriptor.value;
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let definingProperty = false;
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return {
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configurable: true,
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get() {
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if (definingProperty || this === target.prototype || this.hasOwnProperty(key)) {
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return fn;
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}
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const boundFn = throttleByAnimationFrame(fn.bind(this));
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definingProperty = true;
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Object.defineProperty(this, key, {
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value: boundFn,
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configurable: true,
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writable: true,
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});
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definingProperty = false;
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return boundFn;
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},
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};
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};
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}
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