40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
/* -*- 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);
|
|
}
|
|
}
|
|
};
|