/*
Darken
Add menuitem into browser context menu to darken the web page.
Compatibility: Firefox 11.0 or newer.
Copyright (C) 2012 LouCypher
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
// ==UserScript==
// @name            Darken
// @namespace       http://userscripts.org/users/12
// @description     Add menuitem into browser context menu to darken the web page. For Firefox 11.0 and newer only.
// @version         3.0.1
// @author          LouCypher
// @contributor     luckymouse (CSS)
// @license         GPL
// @homepageURL     https://greasyfork.org/scripts/14
// @supportURL      https://greasyfork.org/scripts/14/feedback
// @resource        css https://raw.github.com/LouCypher/userscripts/master/darken/darken.css
// @resource        license https://raw.github.com/LouCypher/userscripts/master/licenses/GPL/LICENSE.txt
// @include         *
// ==/UserScript==
if (frameElement) return;
const STYLE_ID = "userscript-darken-style";
var isDark = sessionStorage.getItem("dark-site");
if (isDark) darken();
if (!(document.head && document.body)) return;
var menu = document.body.appendChild(document.createElement("menu"));
var html = document.documentElement;
if (html.hasAttribute("contextmenu")) {
// We don't want to override web page context menu if any
var contextmenu = $("#" + html.getAttribute("contextmenu"));
contextmenu.appendChild(menu); // Append to web page context menu
} else {
html.setAttribute("contextmenu", "userscript-darken-context-menu");
}
menu.outerHTML = '<menu id="userscript-darken-context-menu"\
type="context">\
<menuitem id="userscript-darken-menuitem"\
type="checkbox"\
label="Darken">\
</menuitem>\
</menu>';
if ("contextMenu" in html && "HTMLMenuItemElement" in window) {
var menuitem = $("#userscript-darken-menuitem");
if (isDark) menuitem.setAttribute("checked", "true");
// Executed on clicking a menuitem
menuitem.addEventListener("click", toggleDarken, false);
}
function darken() {
var style = $("head").appendChild(document.createElement("style"));
style.id = STYLE_ID;
style.textContent = GM_getResourceText("css");
sessionStorage.setItem("dark-site", true);
}
function toggleDarken() {
var x = pageXOffset;
var y = pageYOffset
var styleNode = document.getElementById(STYLE_ID);
if (styleNode) {
styleNode.parentNode.removeChild(styleNode);
sessionStorage.removeItem("dark-site");
} else {
darken();
}
scrollTo(x, y); // Restore scroll positions
}
function $(aSelector, aNode) {
return (aNode || document).querySelector(aSelector);
}