38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
import raf from 'raf';
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import getScroll 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;
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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, options = {}) {
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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 (container === window) {
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window.scrollTo(window.pageXOffset, nextScrollTop);
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} else {
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container.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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