The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/addon-sdk/source/lib/sdk/preferences/event-target.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,61 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +'use strict';
     1.8 +
     1.9 +module.metadata = {
    1.10 +  "stability": "unstable"
    1.11 +};
    1.12 +
    1.13 +const { Cc, Ci } = require('chrome');
    1.14 +const { Class } = require('../core/heritage');
    1.15 +const { EventTarget } = require('../event/target');
    1.16 +const { Branch } = require('./service');
    1.17 +const { emit, off } = require('../event/core');
    1.18 +const { when: unload } = require('../system/unload');
    1.19 +
    1.20 +const prefTargetNS = require('../core/namespace').ns();
    1.21 +
    1.22 +const PrefsTarget = Class({
    1.23 +  extends: EventTarget,
    1.24 +  initialize: function(options) {
    1.25 +    options = options || {};
    1.26 +    EventTarget.prototype.initialize.call(this, options);
    1.27 +
    1.28 +    let branchName = options.branchName || '';
    1.29 +    let branch = Cc["@mozilla.org/preferences-service;1"].
    1.30 +        getService(Ci.nsIPrefService).
    1.31 +        getBranch(branchName).
    1.32 +        QueryInterface(Ci.nsIPrefBranch2);
    1.33 +    prefTargetNS(this).branch = branch;
    1.34 +
    1.35 +    // provides easy access to preference values
    1.36 +    this.prefs = Branch(branchName);
    1.37 +
    1.38 +    // start listening to preference changes
    1.39 +    let observer = prefTargetNS(this).observer = onChange.bind(this);
    1.40 +    branch.addObserver('', observer, false);
    1.41 +
    1.42 +    // Make sure to destroy this on unload
    1.43 +    unload(destroy.bind(this));
    1.44 +  }
    1.45 +});
    1.46 +exports.PrefsTarget = PrefsTarget;
    1.47 +
    1.48 +/* HELPERS */
    1.49 +
    1.50 +function onChange(subject, topic, name) {
    1.51 +  if (topic === 'nsPref:changed') {
    1.52 +    emit(this, name, name);
    1.53 +    emit(this, '', name);
    1.54 +  }
    1.55 +}
    1.56 +
    1.57 +function destroy() {
    1.58 +  off(this);
    1.59 +
    1.60 +  // stop listening to preference changes
    1.61 +  let branch = prefTargetNS(this).branch;
    1.62 +  branch.removeObserver('', prefTargetNS(this).observer, false);
    1.63 +  prefTargetNS(this).observer = null;
    1.64 +}