1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/browser/devtools/styleeditor/utils.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,40 @@
1.4 +/* -*- Mode: Javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +const {Cc, Ci, Cu, Cr} = require("chrome");
1.11 +
1.12 +Cu.import("resource://gre/modules/Services.jsm");
1.13 +Cu.import("resource://gre/modules/devtools/event-emitter.js");
1.14 +
1.15 +exports.PREF_ORIG_SOURCES = "devtools.styleeditor.source-maps-enabled";
1.16 +
1.17 +/**
1.18 + * A PreferenceObserver observes a pref branch for pref changes.
1.19 + * It emits an event for each preference change.
1.20 + */
1.21 +function PrefObserver(branchName) {
1.22 + this.branchName = branchName;
1.23 + this.branch = Services.prefs.getBranch(branchName);
1.24 + this.branch.addObserver("", this, false);
1.25 +
1.26 + EventEmitter.decorate(this);
1.27 +}
1.28 +
1.29 +exports.PrefObserver = PrefObserver;
1.30 +
1.31 +PrefObserver.prototype = {
1.32 + observe: function(subject, topic, data) {
1.33 + if (topic == "nsPref:changed") {
1.34 + this.emit(this.branchName + data);
1.35 + }
1.36 + },
1.37 +
1.38 + destroy: function() {
1.39 + if (this.branch) {
1.40 + this.branch.removeObserver('', this);
1.41 + }
1.42 + }
1.43 +};
1.44 \ No newline at end of file
