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Viewing file:     Scroll.js (2.41 KB)      -rw-r--r--

"use strict";

/**
 * 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.
 *
 */

/**
 * @param {DOMElement} element
 * @param {DOMDocument} doc
 * @return {boolean}
 */
function _isViewportScrollElement(element, doc) {
  return !!doc && (element === doc.documentElement || element === doc.body);
}
/**
 * Scroll Module. This class contains 4 simple static functions
 * to be used to access Element.scrollTop/scrollLeft properties.
 * To solve the inconsistencies between browsers when either
 * document.body or document.documentElement is supplied,
 * below logic will be used to alleviate the issue:
 *
 * 1. If 'element' is either 'document.body' or 'document.documentElement,
 *    get whichever element's 'scroll{Top,Left}' is larger.
 * 2. If 'element' is either 'document.body' or 'document.documentElement',
 *    set the 'scroll{Top,Left}' on both elements.
 */


var Scroll = {
  /**
   * @param {DOMElement} element
   * @return {number}
   */
  getTop: function getTop(element) {
    var doc = element.ownerDocument;
    return _isViewportScrollElement(element, doc) ? // In practice, they will either both have the same value,
    // or one will be zero and the other will be the scroll position
    // of the viewport. So we can use `X || Y` instead of `Math.max(X, Y)`
    doc.body.scrollTop || doc.documentElement.scrollTop : element.scrollTop;
  },

  /**
   * @param {DOMElement} element
   * @param {number} newTop
   */
  setTop: function setTop(element, newTop) {
    var doc = element.ownerDocument;

    if (_isViewportScrollElement(element, doc)) {
      doc.body.scrollTop = doc.documentElement.scrollTop = newTop;
    } else {
      element.scrollTop = newTop;
    }
  },

  /**
   * @param {DOMElement} element
   * @return {number}
   */
  getLeft: function getLeft(element) {
    var doc = element.ownerDocument;
    return _isViewportScrollElement(element, doc) ? doc.body.scrollLeft || doc.documentElement.scrollLeft : element.scrollLeft;
  },

  /**
   * @param {DOMElement} element
   * @param {number} newLeft
   */
  setLeft: function setLeft(element, newLeft) {
    var doc = element.ownerDocument;

    if (_isViewportScrollElement(element, doc)) {
      doc.body.scrollLeft = doc.documentElement.scrollLeft = newLeft;
    } else {
      element.scrollLeft = newLeft;
    }
  }
};
module.exports = Scroll;