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Diffstat (limited to 'packages/vold-utils/lib/unload+.js')
-rw-r--r-- | packages/vold-utils/lib/unload+.js | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/packages/vold-utils/lib/unload+.js b/packages/vold-utils/lib/unload+.js deleted file mode 100644 index 285fd46..0000000 --- a/packages/vold-utils/lib/unload+.js +++ /dev/null @@ -1,80 +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"; - -const { Class } = require("sdk/core/heritage"); -const unloadNS = require("sdk/core/namespace").ns(); - -var Unloader = exports.Unloader = Class({ - initialize: function Unloader() { - let unloaders = unloadNS(this).unloaders = []; - - let unloadersUnlaod = unloadNS(this).unloadersUnlaod = function() { - unloaders.slice().forEach(function(u) u()); - unloaders.length = 0; - } - - require("sdk/system/unload").when(unloadersUnlaod); - }, - unload: function unload(callback, container) { - // Calling with no arguments runs all the unloader callbacks - if (callback == null) { - unloadNS(this).unloadersUnlaod(); - return null; - } - - var remover = removeUnloader.bind(null, unloader, unloadNS(this).unloaders); - - // The callback is bound to the lifetime of the container if we have one - if (container != null) { - // Remove the unloader when the container unloads - container.addEventListener("unload", remover, false); - - // Wrap the callback to additionally remove the unload listener - let origCallback = callback; - callback = function() { - container.removeEventListener("unload", remover, false); - origCallback(); - } - } - - // Wrap the callback in a function that ignores failures - function unloader() { - try { - callback(); - } - catch(e) { - console.error(e); - } - } - unloadNS(this).unloaders.push(unloader); - - // Provide a way to remove the unloader - return remover; - } -}); - -function removeUnloader(unloader, unloaders) { - let index = unloaders.indexOf(unloader); - if (index != -1) - unloaders.splice(index, 1); -} - -/** - * Save callbacks to run when unloading. Optionally scope the callback to a - * container, e.g., window. Provide a way to run all the callbacks. - * - * @usage unload(): Run all callbacks and release them. - * - * @usage unload(callback): Add a callback to run on unload. - * @param [function] callback: 0-parameter function to call on unload. - * @return [function]: A 0-parameter function that undoes adding the callback. - * - * @usage unload(callback, container) Add a scoped callback to run on unload. - * @param [function] callback: 0-parameter function to call on unload. - * @param [node] container: Remove the callback when this container unloads. - * @return [function]: A 0-parameter function that undoes adding the callback. - */ -const gUnload = Unloader(); -exports.unload = gUnload.unload.bind(gUnload); |