44 lines
1.5 KiB
JavaScript
44 lines
1.5 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* 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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/**
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* This module is for small observers that we want to register once per content
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* process, usually in order to forward content-based observer service notifications
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* to the chrome process through message passing. Using a JSM avoids having them
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* in content.js and thereby registering N observers for N open tabs, which is bad
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* for perf.
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*/
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"use strict";
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this.EXPORTED_SYMBOLS = [];
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const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
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Cu.import("resource://gre/modules/Services.jsm");
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var gEMEUIObserver = function(subject, topic, data) {
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let win = subject.top;
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let mm = getMessageManagerForWindow(win);
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if (mm) {
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mm.sendAsyncMessage("EMEVideo:ContentMediaKeysRequest", data);
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}
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};
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function getMessageManagerForWindow(aContentWindow) {
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let ir = aContentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDocShell)
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.sameTypeRootTreeItem
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.QueryInterface(Ci.nsIInterfaceRequestor);
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try {
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// If e10s is disabled, this throws NS_NOINTERFACE for closed tabs.
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return ir.getInterface(Ci.nsIContentFrameMessageManager);
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} catch(e if e.result == Cr.NS_NOINTERFACE) {
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return null;
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}
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}
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Services.obs.addObserver(gEMEUIObserver, "mediakeys-request", false);
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