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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /devtools/client/styleeditor/utils.js
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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diff --git a/devtools/client/styleeditor/utils.js b/devtools/client/styleeditor/utils.js
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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* 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";
+
+const Services = require("Services");
+const EventEmitter = require("devtools/shared/event-emitter");
+
+exports.PREF_ORIG_SOURCES = "devtools.styleeditor.source-maps-enabled";
+
+/**
+ * A PreferenceObserver observes a pref branch for pref changes.
+ * It emits an event for each preference change.
+ */
+function PrefObserver(branchName) {
+ this.branchName = branchName;
+ this.branch = Services.prefs.getBranch(branchName);
+ this.branch.addObserver("", this, false);
+
+ EventEmitter.decorate(this);
+}
+
+exports.PrefObserver = PrefObserver;
+
+PrefObserver.prototype = {
+ observe: function (subject, topic, data) {
+ if (topic == "nsPref:changed") {
+ this.emit(this.branchName + data);
+ }
+ },
+
+ destroy: function () {
+ if (this.branch) {
+ this.branch.removeObserver("", this);
+ }
+ }
+};