mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
44 lines
1.5 KiB
JavaScript
44 lines
1.5 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 module 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 JSM avoids having them
|
|
* in content.js and thereby registering N observers for N open tabs, which is bad
|
|
* for perf.
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
this.EXPORTED_SYMBOLS = [];
|
|
|
|
const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
|
|
|
|
Cu.import("resource://gre/modules/Services.jsm");
|
|
|
|
var gEMEUIObserver = function(subject, topic, data) {
|
|
let win = subject.top;
|
|
let mm = getMessageManagerForWindow(win);
|
|
if (mm) {
|
|
mm.sendAsyncMessage("EMEVideo:ContentMediaKeysRequest", 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;
|
|
}
|
|
}
|
|
|
|
Services.obs.addObserver(gEMEUIObserver, "mediakeys-request", false);
|