This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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82 lines
2.4 KiB
82 lines
2.4 KiB
/** |
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* Copyright (c) 2013-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* @providesModule Scroll |
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*/ |
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/** |
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* @param {DOMElement} element |
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* @param {DOMDocument} doc |
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* @return {boolean} |
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*/ |
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function _isViewportScrollElement(element, doc) { |
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return !!doc && (element === doc.documentElement || element === doc.body); |
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} |
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/** |
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* Scroll Module. This class contains 4 simple static functions |
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* to be used to access Element.scrollTop/scrollLeft properties. |
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* To solve the inconsistencies between browsers when either |
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* document.body or document.documentElement is supplied, |
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* below logic will be used to alleviate the issue: |
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* |
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* 1. If 'element' is either 'document.body' or 'document.documentElement, |
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* get whichever element's 'scroll{Top,Left}' is larger. |
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* 2. If 'element' is either 'document.body' or 'document.documentElement', |
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* set the 'scroll{Top,Left}' on both elements. |
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*/ |
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const Scroll = { |
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/** |
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* @param {DOMElement} element |
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* @return {number} |
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*/ |
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getTop: function (element) { |
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const doc = element.ownerDocument; |
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return _isViewportScrollElement(element, doc) ? |
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// In practice, they will either both have the same value, |
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// or one will be zero and the other will be the scroll position |
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// of the viewport. So we can use `X || Y` instead of `Math.max(X, Y)` |
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doc.body.scrollTop || doc.documentElement.scrollTop : element.scrollTop; |
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}, |
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/** |
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* @param {DOMElement} element |
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* @param {number} newTop |
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*/ |
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setTop: function (element, newTop) { |
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const doc = element.ownerDocument; |
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if (_isViewportScrollElement(element, doc)) { |
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doc.body.scrollTop = doc.documentElement.scrollTop = newTop; |
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} else { |
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element.scrollTop = newTop; |
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} |
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}, |
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/** |
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* @param {DOMElement} element |
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* @return {number} |
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*/ |
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getLeft: function (element) { |
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const doc = element.ownerDocument; |
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return _isViewportScrollElement(element, doc) ? doc.body.scrollLeft || doc.documentElement.scrollLeft : element.scrollLeft; |
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}, |
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/** |
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* @param {DOMElement} element |
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* @param {number} newLeft |
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*/ |
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setLeft: function (element, newLeft) { |
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const doc = element.ownerDocument; |
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if (_isViewportScrollElement(element, doc)) { |
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doc.body.scrollLeft = doc.documentElement.scrollLeft = newLeft; |
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} else { |
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element.scrollLeft = newLeft; |
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} |
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} |
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}; |
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module.exports = Scroll; |