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40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
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/* 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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const {Cc, Ci, Cu, Cr} = require("chrome");
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import("resource://devtools/shared/event-emitter.js");
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exports.PREF_ORIG_SOURCES = "devtools.styleeditor.source-maps-enabled";
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/**
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* A PreferenceObserver observes a pref branch for pref changes.
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* It emits an event for each preference change.
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*/
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function PrefObserver(branchName) {
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this.branchName = branchName;
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this.branch = Services.prefs.getBranch(branchName);
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this.branch.addObserver("", this, false);
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EventEmitter.decorate(this);
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}
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exports.PrefObserver = PrefObserver;
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PrefObserver.prototype = {
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observe: function(subject, topic, data) {
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if (topic == "nsPref:changed") {
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this.emit(this.branchName + data);
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}
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},
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destroy: function() {
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if (this.branch) {
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this.branch.removeObserver('', this);
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}
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}
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}; |