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author | Matt A. Tobin <email@mattatobin.com> | 2018-02-10 02:51:36 -0500 |
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committer | Matt A. Tobin <email@mattatobin.com> | 2018-02-10 02:51:36 -0500 |
commit | 37d5300335d81cecbecc99812747a657588c63eb (patch) | |
tree | 765efa3b6a56bb715d9813a8697473e120436278 /addon-sdk/source/lib/sdk/event/chrome.js | |
parent | b2bdac20c02b12f2057b9ef70b0a946113a00e00 (diff) | |
parent | 4fb11cd5966461bccc3ed1599b808237be6b0de9 (diff) | |
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Merge branch 'ext-work'
Diffstat (limited to 'addon-sdk/source/lib/sdk/event/chrome.js')
-rw-r--r-- | addon-sdk/source/lib/sdk/event/chrome.js | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/addon-sdk/source/lib/sdk/event/chrome.js b/addon-sdk/source/lib/sdk/event/chrome.js deleted file mode 100644 index 9044fef99..000000000 --- a/addon-sdk/source/lib/sdk/event/chrome.js +++ /dev/null @@ -1,65 +0,0 @@ -/* 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"; - -module.metadata = { - "stability": "unstable" -}; - -const { Cc, Ci, Cr, Cu } = require("chrome"); -const { emit, on, off } = require("./core"); -var observerService = Cc["@mozilla.org/observer-service;1"] - .getService(Ci.nsIObserverService); - -const { ShimWaiver } = Cu.import("resource://gre/modules/ShimWaiver.jsm"); -const addObserver = ShimWaiver.getProperty(observerService, "addObserver"); -const removeObserver = ShimWaiver.getProperty(observerService, "removeObserver"); - -const { when: unload } = require("../system/unload"); - -// Simple class that can be used to instantiate event channel that -// implements `nsIObserver` interface. It's will is used by `observe` -// function as observer + event target. It basically proxies observer -// notifications as to it's registered listeners. -function ObserverChannel() {} -Object.freeze(Object.defineProperties(ObserverChannel.prototype, { - QueryInterface: { - value: function(iid) { - if (!iid.equals(Ci.nsIObserver) && - !iid.equals(Ci.nsISupportsWeakReference) && - !iid.equals(Ci.nsISupports)) - throw Cr.NS_ERROR_NO_INTERFACE; - return this; - } - }, - observe: { - value: function(subject, topic, data) { - emit(this, "data", { - type: topic, - target: subject, - data: data - }); - } - } -})); - -function observe(topic) { - let observerChannel = new ObserverChannel(); - - // Note: `nsIObserverService` will not hold a weak reference to a - // observerChannel (since third argument is `true`). There for if it - // will be GC-ed with all it's event listeners once no other references - // will be held. - addObserver(observerChannel, topic, true); - - // We need to remove any observer added once the add-on is unloaded; - // otherwise we'll get a "dead object" exception. - // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1001833 - unload(() => removeObserver(observerChannel, topic)); - - return observerChannel; -} - -exports.observe = observe; |