gecko-dev/dom/settings/SettingsChangeNotifier.jsm

57 строки
1.6 KiB
JavaScript
Исходник Обычный вид История

/* 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"
function debug(s) {
// dump("-*- SettingsChangeNotifier: " + s + "\n");
}
const Cu = Components.utils;
const Cc = Components.classes;
const Ci = Components.interfaces;
let EXPORTED_SYMBOLS = ["SettingsChangeNotifier"];
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyGetter(this, "ppmm", function() {
return Cc["@mozilla.org/parentprocessmessagemanager;1"].getService(Ci.nsIFrameMessageManager);
});
let SettingsChangeNotifier = {
init: function() {
debug("init");
ppmm.addMessageListener("Settings:Changed", this);
Services.obs.addObserver(this, "xpcom-shutdown", false);
},
observe: function(aSubject, aTopic, aData) {
debug("observe");
ppmm.removeMessageListener("Settings:Changed", this);
Services.obs.removeObserver(this, "xpcom-shutdown");
ppmm = null;
},
receiveMessage: function(aMessage) {
debug("receiveMessage");
let msg = aMessage.json;
switch (aMessage.name) {
case "Settings:Changed":
ppmm.sendAsyncMessage("Settings:Change:Return:OK", { key: msg.key, value: msg.value });
Services.obs.notifyObservers(this, "mozsettings-changed", JSON.stringify({
key: msg.key,
value: msg.value
}));
break;
default:
debug("Wrong message: " + aMessage.name);
}
}
}
SettingsChangeNotifier.init();