ng-zorro-antd/esm2015/core/util/throttleByAnimationFrame.js

An enterprise-class UI components based on Ant Design and Angular

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
// 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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