gecko-dev/toolkit/content/LightweightThemeConsumer.jsm

119 строки
4.3 KiB
JavaScript

/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org Code.
*
* The Initial Developer of the Original Code is
* Dao Gottwald <dao@mozilla.com>.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
let EXPORTED_SYMBOLS = ["LightweightThemeConsumer"];
function LightweightThemeConsumer(aDocument) {
this._doc = aDocument;
this._footerId = aDocument.documentElement.getAttribute("lightweightthemesfooter");
Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService)
.addObserver(this, "lightweight-theme-styling-update", false);
var temp = {};
Components.utils.import("resource://gre/modules/LightweightThemeManager.jsm", temp);
this._update(temp.LightweightThemeManager.currentThemeForDisplay);
}
LightweightThemeConsumer.prototype = {
observe: function (aSubject, aTopic, aData) {
if (aTopic != "lightweight-theme-styling-update")
return;
this._update(JSON.parse(aData));
},
destroy: function () {
Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService)
.removeObserver(this, "lightweight-theme-styling-update");
this._doc = null;
},
_update: function (aData) {
if (!aData)
aData = { headerURL: "", footerURL: "", textcolor: "", accentcolor: "" };
var root = this._doc.documentElement;
var active = !!aData.headerURL;
if (active) {
root.style.color = aData.textcolor || "black";
root.style.backgroundColor = aData.accentcolor || "white";
let [r, g, b] = _parseRGB(this._doc.defaultView.getComputedStyle(root, "").color);
let luminance = 0.2125 * r + 0.7154 * g + 0.0721 * b;
root.setAttribute("lwthemetextcolor", luminance <= 110 ? "dark" : "bright");
root.setAttribute("lwtheme", "true");
} else {
root.style.color = "";
root.style.backgroundColor = "";
root.removeAttribute("lwthemetextcolor");
root.removeAttribute("lwtheme");
}
_setImage(root, active, aData.headerURL);
if (this._footerId) {
let footer = this._doc.getElementById(this._footerId);
footer.style.backgroundColor = active ? aData.accentcolor || "white" : "";
_setImage(footer, active, aData.footerURL);
if (active && aData.footerURL)
footer.setAttribute("lwthemefooter", "true");
else
footer.removeAttribute("lwthemefooter");
}
#ifdef XP_MACOSX
if (active)
root.setAttribute("drawintitlebar", "true");
else
root.removeAttribute("drawintitlebar");
#endif
}
}
function _setImage(aElement, aActive, aURL) {
aElement.style.backgroundImage =
(aActive && aURL) ? 'url("' + aURL.replace('"', '\\"', "g") + '")' : "";
}
function _parseRGB(aColorString) {
var rgb = aColorString.match(/^rgba?\((\d+), (\d+), (\d+)/);
rgb.shift();
return rgb.map(function (x) parseInt(x));
}