forked from angular/angular
/
raf.ts
29 lines (28 loc) · 1.26 KB
/
raf.ts
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/**
* @license
* Copyright Google Inc. 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://angular.io/license
*/
import {global} from './global';
export function getNativeRequestAnimationFrame() {
let nativeRequestAnimationFrame: (callback: FrameRequestCallback) => number =
global['requestAnimationFrame'];
let nativeCancelAnimationFrame: (handle: number) => void = global['cancelAnimationFrame'];
if (typeof Zone !== 'undefined' && nativeRequestAnimationFrame && nativeCancelAnimationFrame) {
// use unpatched version of requestAnimationFrame(native delegate) if possible
// to avoid another Change detection
const unpatchedRequestAnimationFrame =
(nativeRequestAnimationFrame as any)[(Zone as any).__symbol__('OriginalDelegate')];
if (unpatchedRequestAnimationFrame) {
nativeRequestAnimationFrame = unpatchedRequestAnimationFrame;
}
const unpatchedCancelAnimationFrame =
(nativeCancelAnimationFrame as any)[(Zone as any).__symbol__('OriginalDelegate')];
if (unpatchedCancelAnimationFrame) {
nativeCancelAnimationFrame = unpatchedCancelAnimationFrame;
}
}
return {nativeRequestAnimationFrame, nativeCancelAnimationFrame};
}