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author | Rogan Creswick <creswick@galois.com> | 2012-03-30 17:07:02 -0700 |
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committer | Rogan Creswick <creswick@galois.com> | 2012-03-30 17:07:02 -0700 |
commit | f6ab6622aab00fe7c2f4c3dc41f786ebbe0f0d73 (patch) | |
tree | 870111038542cd27153e1396ebdc063573249689 /tools/addon-sdk-1.3/packages/api-utils/lib/tabs/observer.js |
initial revision
Diffstat (limited to 'tools/addon-sdk-1.3/packages/api-utils/lib/tabs/observer.js')
-rw-r--r-- | tools/addon-sdk-1.3/packages/api-utils/lib/tabs/observer.js | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/tabs/observer.js b/tools/addon-sdk-1.3/packages/api-utils/lib/tabs/observer.js new file mode 100644 index 0000000..f679917 --- /dev/null +++ b/tools/addon-sdk-1.3/packages/api-utils/lib/tabs/observer.js @@ -0,0 +1,126 @@ +/* vim:set ts=2 sw=2 sts=2 et: */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Jetpack. + * + * The Initial Developer of the Original Code is + * the Mozilla Foundation. + * Portions created by the Initial Developer are Copyright (C) 2011 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Irakli Gozalishvili <gozala@mozilla.com> (Original author) + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +"use strict"; + +const { EventEmitterTrait: EventEmitter } = require("../events"); +const { DOMEventAssembler } = require("../events/assembler"); +const { Trait } = require("../light-traits"); +const { getActiveTab, getTabs, getTabContainers } = require("./utils"); +const { browserWindowIterator, isBrowser } = require("../window-utils"); +const { observer: windowObserver } = require("../windows/observer"); + +const EVENTS = { + "TabOpen": "open", + "TabClose": "close", + "TabSelect": "select", + "TabMove": "move", + "TabPinned": "pin", + "TabUnpinned": "unpin" +}; + + +// Event emitter objects used to register listeners and emit events on them +// when they occur. +const observer = Trait.compose(DOMEventAssembler, EventEmitter).create({ + /** + * Method is implemented by `EventEmitter` and is used just for emitting + * events on registered listeners. + */ + _emit: Trait.required, + /** + * Events that are supported and emitted by the module. + */ + supportedEventsTypes: Object.keys(EVENTS), + /** + * Function handles all the supported events on all the windows that are + * observed. Method is used to proxy events to the listeners registered on + * this event emitter. + * @param {Event} event + * Keyboard event being emitted. + */ + handleEvent: function handleEvent(event) { + this._emit(EVENTS[event.type], event.target, event); + } +}); + +// Currently gecko does not dispatches any event on the previously selected +// tab before / after "TabSelect" is dispatched. In order to work around this +// limitation we keep track of selected tab and emit "deactivate" event with +// that before emitting "activate" on selected tab. +var selectedTab = null; +function onTabSelect(tab) { + if (selectedTab !== tab) { + if (selectedTab) observer._emit("deactivate", selectedTab); + if (tab) observer._emit("activate", selectedTab = tab); + } +}; +observer.on("select", onTabSelect); + +// We also observe opening / closing windows in order to add / remove it's +// containers to the observed list. +function onWindowOpen(chromeWindow) { + if (!isBrowser(chromeWindow)) return; // Ignore if it's not a browser window. + getTabContainers(chromeWindow).forEach(function (container) { + observer.observe(container); + }); +} +windowObserver.on("open", onWindowOpen); + +function onWindowClose(chromeWindow) { + if (!isBrowser(chromeWindow)) return; // Ignore if it's not a browser window. + getTabContainers(chromeWindow).forEach(function (container) { + observer.ignore(container); + }); +} +windowObserver.on("close", onWindowClose); + + +// Currently gecko does not dispatches "TabSelect" events when different +// window gets activated. To work around this limitation we emulate "select" +// event for this case. +windowObserver.on("activate", function onWindowActivate(chromeWindow) { + if (!isBrowser(chromeWindow)) return; // Ignore if it's not a browser window. + observer._emit("select", getActiveTab(chromeWindow)); +}); + +// We should synchronize state, since probably we already have at least one +// window open. +for each (let window in browserWindowIterator()) onWindowOpen(window); + +exports.observer = observer; |