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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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);
}
}
};
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