ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
88 lines • 6.35 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Alibaba.com All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
// tslint:disable:no-any typedef no-invalid-this
import { cancelRequestAnimationFrame, reqAnimFrame } from '../polyfill/request-animation';
/**
* @param {?} fn
* @return {?}
*/
export default function throttleByAnimationFrame(fn) {
/** @type {?} */
let requestId;
/** @type {?} */
const later = (/**
* @param {?} args
* @return {?}
*/
(args) => (/**
* @return {?}
*/
() => {
requestId = null;
fn(...args);
}));
/** @type {?} */
const throttled = (/**
* @param {...?} args
* @return {?}
*/
(...args) => {
if (requestId == null) {
requestId = reqAnimFrame(later(args));
}
});
// tslint:disable-next-line:no-non-null-assertion
((/** @type {?} */ (throttled))).cancel = (/**
* @return {?}
*/
() => cancelRequestAnimationFrame((/** @type {?} */ (requestId))));
return throttled;
}
/**
* @return {?}
*/
export function throttleByAnimationFrameDecorator() {
return (/**
* @param {?} target
* @param {?} key
* @param {?} descriptor
* @return {?}
*/
function (target, key, descriptor) {
/** @type {?} */
const fn = descriptor.value;
/** @type {?} */
let definingProperty = false;
return {
configurable: true,
/**
* @return {?}
*/
get() {
if (definingProperty || this === target.prototype || this.hasOwnProperty(key)) {
return fn;
}
/** @type {?} */
const boundFn = throttleByAnimationFrame(fn.bind(this));
definingProperty = true;
Object.defineProperty(this, key, {
value: boundFn,
configurable: true,
writable: true
});
definingProperty = false;
return boundFn;
}
};
});
}
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