gecko/b2g/components/ProcessGlobal.js

75 lines
2.6 KiB
JavaScript

/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* 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/. */
'use strict';
/**
* This code exists to be a "grab bag" of global code that needs to be
* loaded per B2G process, but doesn't need to directly interact with
* web content.
*
* (It's written as an XPCOM service because it needs to watch
* app-startup.)
*/
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
const kWebApiShimFile = 'chrome://browser/content/webapi.js';
Cu.import('resource://gre/modules/Services.jsm');
Cu.import('resource://gre/modules/XPCOMUtils.jsm');
function debug(msg) {
log(msg);
}
function log(msg) {
// This file implements console.log(), so use dump().
//dump('ProcessGlobal: ' + msg + '\n');
}
function ProcessGlobal() {}
ProcessGlobal.prototype = {
classID: Components.ID('{1a94c87a-5ece-4d11-91e1-d29c29f21b28}'),
QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
Ci.nsISupportsWeakReference]),
observe: function pg_observe(subject, topic, data) {
switch (topic) {
case 'app-startup': {
Services.obs.addObserver(this, 'console-api-log-event', false);
Services.obs.addObserver(this, 'in-process-browser-frame-shown', false);
Services.obs.addObserver(this, 'remote-browser-frame-shown', false);
break;
}
case 'console-api-log-event': {
// Pipe `console` log messages to the nsIConsoleService which
// writes them to logcat on Gonk.
let message = subject.wrappedJSObject;
let prefix = ('Content JS ' + message.level.toUpperCase() +
' at ' + message.filename + ':' + message.lineNumber +
' in ' + (message.functionName || 'anonymous') + ': ');
Services.console.logStringMessage(prefix + Array.join(message.arguments,
' '));
break;
}
case 'remote-browser-frame-shown':
case 'in-process-browser-frame-shown': {
let frameLoader = subject.QueryInterface(Ci.nsIFrameLoader);
let mm = frameLoader.messageManager;
try {
mm.loadFrameScript(kWebApiShimFile, true);
} catch (e) {
log('Error loading ' + kWebApiShimFile + ' as frame script: ' + e + '\n');
}
break;
}
}
},
};
var NSGetFactory = XPCOMUtils.generateNSGetFactory([ProcessGlobal]);