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scrollTo.js
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Thu, Dec 12, 07:26

scrollTo.js
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/* eslint-disable no-nested-ternary */
import { cancel, request } from './animationFrame';
import height from './height';
import getWindow from './isWindow';
import getOffset from './offset';
import getScrollParent from './scrollParent';
import scrollTop from './scrollTop';
export default function scrollTo(selected, scrollParent) {
var offset = getOffset(selected);
var poff = {
top: 0,
left: 0
};
if (!selected) return undefined;
var list = scrollParent || getScrollParent(selected);
var isWin = getWindow(list);
var listScrollTop = scrollTop(list);
var listHeight = height(list, true);
if (!isWin) poff = getOffset(list);
offset = {
top: offset.top - poff.top,
left: offset.left - poff.left,
height: offset.height,
width: offset.width
};
var selectedHeight = offset.height;
var selectedTop = offset.top + (isWin ? 0 : listScrollTop);
var bottom = selectedTop + selectedHeight;
listScrollTop = listScrollTop > selectedTop ? selectedTop : bottom > listScrollTop + listHeight ? bottom - listHeight : listScrollTop;
var id = request(function () {
return scrollTop(list, listScrollTop);
});
return function () {
return cancel(id);
};
}

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