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b3c4267b3c
Differential Revision: https://phabricator.services.mozilla.com/D34460 --HG-- extra : moz-landing-system : lando
62 lines
1.9 KiB
JavaScript
62 lines
1.9 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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var EXPORTED_SYMBOLS = ["LightweightThemeManager"];
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const {AppConstants} = ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
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const {XPCOMUtils} = ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
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XPCOMUtils.defineLazyGetter(this, "hiddenWindow", () => {
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const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
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let browser = Services.appShell.createWindowlessBrowser(true);
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let principal = Services.scriptSecurityManager.getSystemPrincipal();
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browser.docShell.createAboutBlankContentViewer(principal, principal);
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Services.obs.addObserver(() => { browser.close(); }, "xpcom-will-shutdown");
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return browser.document.ownerGlobal;
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});
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if (AppConstants.DEBUG) {
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void hiddenWindow;
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}
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var _fallbackThemeData = null;
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var LightweightThemeManager = {
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set fallbackThemeData(data) {
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if (data && Object.getOwnPropertyNames(data).length) {
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_fallbackThemeData = Object.assign({}, data);
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for (let key of ["theme", "darkTheme"]) {
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let data = _fallbackThemeData[key] || null;
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if (data && typeof data.headerURL === "string") {
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data.headerImage = new hiddenWindow.Image();
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data.headerImage.src = data.headerURL;
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}
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}
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} else {
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_fallbackThemeData = null;
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}
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},
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/*
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* Returns the currently active theme, taking the fallback theme into account
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* if we'd be using the default theme otherwise.
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*
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* This will always return the original theme data and not make use of
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* locally persisted resources.
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*/
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get currentThemeWithFallback() {
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return _fallbackThemeData && _fallbackThemeData.theme;
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},
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get themeData() {
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return _fallbackThemeData || {theme: null};
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},
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};
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