gecko-dev/browser/modules/ContentObservers.js

83 строки
2.8 KiB
JavaScript

/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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/. */
/**
* This process script is for small observers that we want to register
* once per content process, usually in order to forward content-based
* observer service notifications to the chrome process through
* message passing. Using a process script avoids having them in
* content.js and thereby registering N observers for N open tabs,
* which is bad for perf.
*/
"use strict";
ChromeUtils.import("resource://gre/modules/Services.jsm");
ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
ChromeUtils.defineModuleGetter(this, "ContentWebRTC",
"resource:///modules/ContentWebRTC.jsm");
var gEMEUIObserver = function(subject, topic, data) {
let win = subject.top;
let mm = getMessageManagerForWindow(win);
if (mm) {
mm.sendAsyncMessage("EMEVideo:ContentMediaKeysRequest", data);
}
};
var gDecoderDoctorObserver = function(subject, topic, data) {
let win = subject.top;
let mm = getMessageManagerForWindow(win);
if (mm) {
mm.sendAsyncMessage("DecoderDoctor:Notification", data);
}
};
function getMessageManagerForWindow(aContentWindow) {
let ir = aContentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDocShell)
.sameTypeRootTreeItem
.QueryInterface(Ci.nsIInterfaceRequestor);
try {
// If e10s is disabled, this throws NS_NOINTERFACE for closed tabs.
return ir.getInterface(Ci.nsIContentFrameMessageManager);
} catch (e) {
if (e.result == Cr.NS_NOINTERFACE) {
return null;
}
throw e;
}
}
Services.obs.addObserver(gEMEUIObserver, "mediakeys-request");
Services.obs.addObserver(gDecoderDoctorObserver, "decoder-doctor-notification");
// ContentWebRTC observer registration.
const kWebRTCObserverTopics = ["getUserMedia:request",
"recording-device-stopped",
"PeerConnection:request",
"recording-device-events",
"recording-window-ended"];
function webRTCObserve(aSubject, aTopic, aData) {
ContentWebRTC.observe(aSubject, aTopic, aData);
}
for (let topic of kWebRTCObserverTopics) {
Services.obs.addObserver(webRTCObserve, topic);
}
if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT)
Services.obs.addObserver(processShutdown, "content-child-shutdown");
function processShutdown() {
for (let topic of kWebRTCObserverTopics) {
Services.obs.removeObserver(webRTCObserve, topic);
}
Services.obs.removeObserver(processShutdown, "content-child-shutdown");
}