| /* Copyright (c) 2014 The Chromium Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. */ |
| |
| var borderColor; |
| var borderStyle; |
| var borderWidth; |
| |
| chrome.storage.onChanged.addListener(function(changes, namespace) { |
| if (changes.addBorder.newValue) { |
| addBorders(); |
| } else { |
| removeBorders(); |
| } |
| }); |
| |
| chrome.storage.sync.get("addBorder", function(item) { |
| if (item.addBorder) { |
| addBorders(); |
| } |
| }); |
| |
| document.addEventListener('contextmenu', function(element) { |
| updateContextMenuItem(element); |
| }, false); |
| |
| document.addEventListener('mouseover', function(element) { |
| updateContextMenuItem(element); |
| }, false); |
| |
| document.addEventListener('focus', function(element) { |
| updateContextMenuItem(element); |
| }); |
| |
| /** |
| * Sends a message to the backgrond script notifying it to |
| * enable or disable the context menu item. |
| * |
| * @param element |
| */ |
| function updateContextMenuItem(element) { |
| var longDesc = ''; |
| var ariaDescribedAt = ''; |
| |
| if (element.target.hasAttribute("longdesc")) { |
| longDesc = element.target.getAttribute("longdesc"); |
| var link = document.createElement("a"); |
| link.href = longDesc; |
| longDesc = link.href; |
| } |
| |
| if (element.target.hasAttribute("aria-describedat")) { |
| ariaDescribedAt = element.target.getAttribute("aria-describedat"); |
| } |
| |
| if (longDesc !== '' || ariaDescribedAt !== '') { |
| chrome.runtime.sendMessage({ |
| ariaDescribedAt: ariaDescribedAt, |
| longDesc: longDesc, |
| enabled: true |
| }); |
| } else { |
| chrome.runtime.sendMessage({ |
| enabled: false |
| }); |
| } |
| } |
| |
| /** |
| * Modify border to make the HTML element more visible. |
| */ |
| function addBorders() { |
| document.body.setAttribute('showlongdescborders', ''); |
| } |
| |
| /** |
| * Revert back to the original border styling. |
| */ |
| function removeBorders() { |
| document.body.removeAttribute('showlongdescborders', ''); |
| } |