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Viewing file:     getScrollPosition.js (1.57 KB)      -rw-r--r--

/**
 * 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;