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b61a06ef8e
MozReview-Commit-ID: EUthIoHKlOm --HG-- extra : rebase_source : c2f81b795b79eae4b2dca6526f5000181d3fa2c5
94 lines
3 KiB
JavaScript
94 lines
3 KiB
JavaScript
/* 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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/* globals Components, XPCOMUtils, Preferences, ActivityStream */
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"use strict";
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const {utils: Cu} = Components;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/Preferences.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "ActivityStream",
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"resource://activity-stream/lib/ActivityStream.jsm");
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const ACTIVITY_STREAM_ENABLED_PREF = "browser.newtabpage.activity-stream.enabled";
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const REASON_STARTUP_ON_PREF_CHANGE = "PREF_ON";
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const REASON_SHUTDOWN_ON_PREF_CHANGE = "PREF_OFF";
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const ACTIVITY_STREAM_OPTIONS = {newTabURL: "about:newtab"};
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let activityStream;
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let startupData;
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/**
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* init - Initializes an instance of ActivityStream. This could be called by
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* the startup() function exposed by bootstrap.js, or it could be called
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* when ACTIVITY_STREAM_ENABLED_PREF is changed from false to true.
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*
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* @param {string} reason - Reason for initialization. Could be install, upgrade, or PREF_ON
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*/
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function init(reason) {
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// Don't re-initialize
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if (activityStream && activityStream.initialized) {
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return;
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}
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const options = Object.assign({}, startupData || {}, ACTIVITY_STREAM_OPTIONS);
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activityStream = new ActivityStream(options);
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activityStream.init(reason);
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}
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/**
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* uninit - Uninitializes the activityStream instance, if it exsits.This could be
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* called by the shutdown() function exposed by bootstrap.js, or it could
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* be called when ACTIVITY_STREAM_ENABLED_PREF is changed from true to false.
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*
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* @param {type} reason Reason for uninitialization. Could be uninstall, upgrade, or PREF_OFF
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*/
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function uninit(reason) {
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if (activityStream) {
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activityStream.uninit(reason);
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activityStream = null;
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}
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}
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/**
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* onPrefChanged - handler for changes to ACTIVITY_STREAM_ENABLED_PREF
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*
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* @param {bool} isEnabled Determines whether Activity Stream is enabled
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*/
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function onPrefChanged(isEnabled) {
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if (isEnabled) {
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init(REASON_STARTUP_ON_PREF_CHANGE);
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} else {
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uninit(REASON_SHUTDOWN_ON_PREF_CHANGE);
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}
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}
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// The functions below are required by bootstrap.js
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this.install = function install(data, reason) {};
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this.startup = function startup(data, reason) {
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// Cache startup data which contains stuff like the version number, etc.
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// so we can use it when we init
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startupData = data;
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// Listen for changes to the pref that enables Activity Stream
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Preferences.observe(ACTIVITY_STREAM_ENABLED_PREF, onPrefChanged);
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// Only initialize if the pref is true
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if (Preferences.get(ACTIVITY_STREAM_ENABLED_PREF)) {
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init(reason);
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}
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};
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this.shutdown = function shutdown(data, reason) {
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// Uninitialize Activity Stream
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startupData = null;
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uninit(reason);
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// Stop listening to the pref that enables Activity Stream
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Preferences.ignore(ACTIVITY_STREAM_ENABLED_PREF, onPrefChanged);
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};
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this.uninstall = function uninstall(data, reason) {};
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