39 lines
1.3 KiB
TypeScript
39 lines
1.3 KiB
TypeScript
import raf from './raf';
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import getScroll, { isWindow } from './getScroll';
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import { easeInOutCubic } from './easings';
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interface ScrollToOptions {
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/** Scroll container, default as window */
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getContainer?: () => HTMLElement | Window | Document;
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/** Scroll end callback */
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callback?: () => any;
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/** Animation duration, default as 450 */
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duration?: number;
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}
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export default function scrollTo(y: number, options: ScrollToOptions = {}) {
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const { getContainer = () => window, callback, duration = 450 } = options;
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const container = getContainer();
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const scrollTop = getScroll(container, true);
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const startTime = Date.now();
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const frameFunc = () => {
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const timestamp = Date.now();
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const time = timestamp - startTime;
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const nextScrollTop = easeInOutCubic(time > duration ? duration : time, scrollTop, y, duration);
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if (isWindow(container)) {
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(container as Window).scrollTo(window.pageXOffset, nextScrollTop);
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} else if (container instanceof HTMLDocument || container.constructor.name === 'HTMLDocument') {
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(container as HTMLDocument).documentElement.scrollTop = nextScrollTop;
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} else {
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(container as HTMLElement).scrollTop = nextScrollTop;
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}
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if (time < duration) {
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raf(frameFunc);
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} else if (typeof callback === 'function') {
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callback();
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}
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};
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raf(frameFunc);
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}
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