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