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/* 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;
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