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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @typechecks
*/
'use strict';
var getDocumentScrollElement = require("./getDocumentScrollElement");
var getUnboundedScrollPosition = require("./getUnboundedScrollPosition");
/**
* Gets the scroll position of the supplied element or window.
*
* The return values are bounded. This means that if the scroll position is
* negative or exceeds the element boundaries (which is possible using inertial
* scrolling), you will get zero or the maximum scroll position, respectively.
*
* If you need the unbound scroll position, use `getUnboundedScrollPosition`.
*
* @param {DOMWindow|DOMElement} scrollable
* @return {object} Map with `x` and `y` keys.
*/
function getScrollPosition(scrollable) {
var documentScrollElement = getDocumentScrollElement(scrollable.ownerDocument || scrollable.document);
if (scrollable.Window && scrollable instanceof scrollable.Window) {
scrollable = documentScrollElement;
}
var scrollPosition = getUnboundedScrollPosition(scrollable);
var viewport = scrollable === documentScrollElement ? scrollable.ownerDocument.documentElement : scrollable;
var xMax = scrollable.scrollWidth - viewport.clientWidth;
var yMax = scrollable.scrollHeight - viewport.clientHeight;
scrollPosition.x = Math.max(0, Math.min(scrollPosition.x, xMax));
scrollPosition.y = Math.max(0, Math.min(scrollPosition.y, yMax));
return scrollPosition;
}
module.exports = getScrollPosition;
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