ant-design/components/_util/getRequestAnimationFrame.tsx
陆离 3789e0cbbb Affix listener bug fix (#4756)
*  Affix listener bug fix

 + close #4755
 + close #4760
 + clearScrollEventListeners before setTargetEventListeners
 + add tests for throttle
 + append affix test case

*  genMockFn -> fn()
2017-02-08 14:44:43 +08:00

45 lines
1.3 KiB
TypeScript

const availablePrefixs = ['moz', 'ms', 'webkit'];
function requestAnimationFramePolyfill() {
let lastTime = 0;
return function(callback) {
const currTime = new Date().getTime();
const timeToCall = Math.max(0, 16 - (currTime - lastTime));
const id = window.setTimeout(function() { callback(currTime + timeToCall); }, timeToCall);
lastTime = currTime + timeToCall;
return id;
};
}
export default function getRequestAnimationFrame() {
if (typeof window === 'undefined') {
return () => {};
}
if (window.requestAnimationFrame) {
return window.requestAnimationFrame;
}
const prefix = availablePrefixs.filter(key => `${key}RequestAnimationFrame` in window)[0];
return prefix
? window[`${prefix}RequestAnimationFrame`]
: requestAnimationFramePolyfill();
}
export function cancelRequestAnimationFrame(id) {
if (typeof window === 'undefined') {
return null;
}
if (window.cancelAnimationFrame) {
return window.cancelAnimationFrame(id);
}
const prefix = availablePrefixs.filter(key =>
`${key}CancelAnimationFrame` in window || `${key}CancelRequestAnimationFrame` in window
)[0];
return prefix ?
(window[`${prefix}CancelAnimationFrame`] || window[`${prefix}CancelRequestAnimationFrame`]).call(this, id)
: clearTimeout(id);
}