toolkit/mozapps/extensions/LightweightThemeManager.jsm
author Marian-Vasile Laza <mlaza@mozilla.com>
Mon, 06 Feb 2023 13:45:17 +0200
changeset 651854 b06e825a4d8137434a1524b1ef7049f85cdc60d1
parent 481427 58fd5776802aa7dd7e6d3fddd7d433da5ef30426
permissions -rw-r--r--
Backed out changeset 8b3b3c83025d (bug 1797899) for bc failures on browser_AddonStudies.js. CLOSED TREE

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

var EXPORTED_SYMBOLS = ["LightweightThemeManager"];

// Holds optional fallback theme data that will be returned when no data for an
// active theme can be found. This the case for WebExtension Themes, for example.
var _fallbackThemeData = null;

var LightweightThemeManager = {
  set fallbackThemeData(data) {
    if (data && Object.getOwnPropertyNames(data).length) {
      _fallbackThemeData = Object.assign({}, data);
    } else {
      _fallbackThemeData = null;
    }
  },

  /*
   * Returns the currently active theme, taking the fallback theme into account
   * if we'd be using the default theme otherwise.
   *
   * This will always return the original theme data and not make use of
   * locally persisted resources.
   */
  get currentThemeWithFallback() {
    return _fallbackThemeData && _fallbackThemeData.theme;
  },

  get themeData() {
    return _fallbackThemeData || { theme: null };
  },
};