зеркало из https://github.com/mozilla/gecko-dev.git
130 строки
4.3 KiB
JavaScript
130 строки
4.3 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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let Cu = Components.utils;
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let Ci = Components.interfaces;
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let Cc = Components.classes;
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let Cr = Components.results;
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/BrowserElementParent.jsm");
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const NS_PREFBRANCH_PREFCHANGE_TOPIC_ID = "nsPref:changed";
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const BROWSER_FRAMES_ENABLED_PREF = "dom.mozBrowserFramesEnabled";
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function debug(msg) {
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//dump("BrowserElementParent.js - " + msg + "\n");
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}
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/**
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* BrowserElementParent implements one half of <iframe mozbrowser>. (The other
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* half is, unsurprisingly, BrowserElementChild.)
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*
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* BrowserElementParentFactory detects when we create a windows or docshell
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* contained inside a <iframe mozbrowser> and creates a BrowserElementParent
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* object for that window.
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*
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* It creates a BrowserElementParent that injects script to listen for
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* certain event.
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*/
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function BrowserElementParentFactory() {
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this._initialized = false;
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}
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BrowserElementParentFactory.prototype = {
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classID: Components.ID("{ddeafdac-cb39-47c4-9cb8-c9027ee36d26}"),
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
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Ci.nsISupportsWeakReference]),
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/**
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* Called on app startup, and also when the browser frames enabled pref is
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* changed.
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*/
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_init: function() {
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if (this._initialized) {
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return;
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}
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// If the pref is disabled, do nothing except wait for the pref to change.
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// (This is important for tests, if nothing else.)
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if (!this._browserFramesPrefEnabled()) {
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Services.prefs.addObserver(BROWSER_FRAMES_ENABLED_PREF, this, /* ownsWeak = */ true);
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return;
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}
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debug("_init");
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this._initialized = true;
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// Maps frame elements to BrowserElementParent objects. We never look up
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// anything in this map; the purpose is to keep the BrowserElementParent
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// alive for as long as its frame element lives.
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this._bepMap = new WeakMap();
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Services.obs.addObserver(this, 'remote-browser-pending', /* ownsWeak = */ true);
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Services.obs.addObserver(this, 'inprocess-browser-shown', /* ownsWeak = */ true);
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},
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_browserFramesPrefEnabled: function() {
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try {
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return Services.prefs.getBoolPref(BROWSER_FRAMES_ENABLED_PREF);
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}
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catch(e) {
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return false;
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}
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},
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_observeInProcessBrowserFrameShown: function(frameLoader) {
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// Ignore notifications that aren't from a BrowserOrApp
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if (!frameLoader.QueryInterface(Ci.nsIFrameLoader).ownerIsBrowserOrAppFrame) {
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return;
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}
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debug("In-process browser frame shown " + frameLoader);
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this._createBrowserElementParent(frameLoader,
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/* hasRemoteFrame = */ false,
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/* pending frame */ false);
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},
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_observeRemoteBrowserFramePending: function(frameLoader) {
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// Ignore notifications that aren't from a BrowserOrApp
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if (!frameLoader.QueryInterface(Ci.nsIFrameLoader).ownerIsBrowserOrAppFrame) {
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return;
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}
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debug("Remote browser frame shown " + frameLoader);
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this._createBrowserElementParent(frameLoader,
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/* hasRemoteFrame = */ true,
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/* pending frame */ true);
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},
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_createBrowserElementParent: function(frameLoader, hasRemoteFrame, isPendingFrame) {
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let frameElement = frameLoader.QueryInterface(Ci.nsIFrameLoader).ownerElement;
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this._bepMap.set(frameElement, BrowserElementParentBuilder.create(
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frameLoader, hasRemoteFrame, isPendingFrame));
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},
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observe: function(subject, topic, data) {
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switch(topic) {
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case 'app-startup':
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this._init();
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break;
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case NS_PREFBRANCH_PREFCHANGE_TOPIC_ID:
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if (data == BROWSER_FRAMES_ENABLED_PREF) {
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this._init();
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}
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break;
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case 'remote-browser-pending':
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this._observeRemoteBrowserFramePending(subject);
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break;
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case 'inprocess-browser-shown':
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this._observeInProcessBrowserFrameShown(subject);
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break;
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}
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},
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};
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this.NSGetFactory = XPCOMUtils.generateNSGetFactory([BrowserElementParentFactory]);
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