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51 lines
1.4 KiB
TypeScript
51 lines
1.4 KiB
TypeScript
import raf from 'rc-util/lib/raf';
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export function throttleByAnimationFrame(fn: (...args: any[]) => void) {
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let requestId: number | null;
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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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return function throttle(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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// In IE11 calling Object.defineProperty has a side-effect of evaluating the
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// getter for the property which is being replaced. This causes infinite
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// recursion and an "Out of stack space" error.
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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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/* istanbul ignore next */
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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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