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/* 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', '');
}
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