зеркало из https://github.com/mozilla/gecko-dev.git
116 строки
3.2 KiB
JavaScript
116 строки
3.2 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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"use strict";
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var EXPORTED_SYMBOLS = [ "AboutNewTab" ];
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ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
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ChromeUtils.import("resource://gre/modules/Services.jsm");
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XPCOMUtils.defineLazyModuleGetters(this, {
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ActivityStream: "resource://activity-stream/lib/ActivityStream.jsm",
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RemotePages: "resource://gre/modules/remotepagemanager/RemotePageManagerParent.jsm"
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});
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const BROWSER_READY_NOTIFICATION = "sessionstore-windows-restored";
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var AboutNewTab = {
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QueryInterface: ChromeUtils.generateQI([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
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// AboutNewTab
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pageListener: null,
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isOverridden: false,
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activityStream: null,
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/**
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* init - Initializes an instance of Activity Stream if one doesn't exist already
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* and creates the instance of Remote Page Manager which Activity Stream
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* uses for message passing.
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*
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* @param {obj} pageListener - Optional argument. An existing instance of RemotePages
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* which Activity Stream has previously made, and we
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* would like to re-use.
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*/
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init(pageListener) {
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if (this.isOverridden) {
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return;
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}
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// Since `init` can be called via `reset` at a later time with an existing
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// pageListener, we want to only add the observer if we are initializing
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// without this pageListener argument. This means it was the first call to `init`
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if (!pageListener) {
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Services.obs.addObserver(this, BROWSER_READY_NOTIFICATION);
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}
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this.pageListener = pageListener || new RemotePages(["about:home", "about:newtab", "about:welcome"]);
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},
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/**
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* onBrowserReady - Continues the initialization of Activity Stream after browser is ready.
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*/
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onBrowserReady() {
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if (this.activityStream && this.activityStream.initialized) {
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return;
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}
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this.activityStream = new ActivityStream();
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try {
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this.activityStream.init();
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} catch (e) {
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Cu.reportError(e);
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}
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},
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/**
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* uninit - Uninitializes Activity Stream if it exists, and destroys the pageListener
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* if it exists.
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*/
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uninit() {
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if (this.activityStream) {
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this.activityStream.uninit();
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this.activityStream = null;
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}
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if (this.pageListener) {
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this.pageListener.destroy();
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this.pageListener = null;
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}
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},
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override(shouldPassPageListener) {
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this.isOverridden = true;
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const pageListener = this.pageListener;
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if (!pageListener)
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return null;
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if (shouldPassPageListener) {
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this.pageListener = null;
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return pageListener;
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}
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this.uninit();
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return null;
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},
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reset(pageListener) {
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this.isOverridden = false;
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this.init(pageListener);
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},
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// nsIObserver implementation
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observe(subject, topic, data) {
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switch (topic) {
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case BROWSER_READY_NOTIFICATION:
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Services.obs.removeObserver(this, BROWSER_READY_NOTIFICATION);
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// Avoid running synchronously during this event that's used for timing
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Services.tm.dispatchToMainThread(() => this.onBrowserReady());
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break;
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}
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}
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};
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