48 lines
1.2 KiB
TypeScript
48 lines
1.2 KiB
TypeScript
import raf from './raf';
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export default function throttleByAnimationFrame(fn: (...args: any[]) => void) {
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let requestId: number;
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const later = (args: any[]) => () => {
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requestId = null;
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fn(...args);
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};
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const throttled = (...args: any[]) => {
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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 as any).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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// eslint-disable-next-line func-names
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return function (target: any, key: string, descriptor: any) {
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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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// eslint-disable-next-line no-prototype-builtins
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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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