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/**
* Copyright (c) 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule getUnboundedScrollPosition
* @typechecks
*/
'use strict';
/**
* Gets the scroll position of the supplied element or window.
*
* The return values are unbounded, unlike `getScrollPosition`. This means they
* may be negative or exceed the element boundaries (which is possible using
* inertial scrolling).
*
* @param {DOMWindow|DOMElement} scrollable
* @return {object} Map with `x` and `y` keys.
*/
function getUnboundedScrollPosition(scrollable) {
if (scrollable.Window && scrollable instanceof scrollable.Window) {
return {
x: scrollable.pageXOffset || scrollable.document.documentElement.scrollLeft,
y: scrollable.pageYOffset || scrollable.document.documentElement.scrollTop
};
}
return {
x: scrollable.scrollLeft,
y: scrollable.scrollTop
};
}
module.exports = getUnboundedScrollPosition;
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