michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: "use strict";
michael@0: 
michael@0: module.metadata = {
michael@0:   "stability": "unstable"
michael@0: };
michael@0: 
michael@0: const { EventEmitterTrait: EventEmitter } = require("../deprecated/events");
michael@0: const { WindowTracker, windowIterator } = require("../deprecated/window-utils");
michael@0: const { DOMEventAssembler } = require("../deprecated/events/assembler");
michael@0: const { Trait } = require("../deprecated/light-traits");
michael@0: 
michael@0: // Event emitter objects used to register listeners and emit events on them
michael@0: // when they occur.
michael@0: const observer = Trait.compose(DOMEventAssembler, EventEmitter).create({
michael@0:   /**
michael@0:    * Method is implemented by `EventEmitter` and is used just for emitting
michael@0:    * events on registered listeners.
michael@0:    */
michael@0:   _emit: Trait.required,
michael@0:   /**
michael@0:    * Events that are supported and emitted by the module.
michael@0:    */
michael@0:   supportedEventsTypes: [ "activate", "deactivate" ],
michael@0:   /**
michael@0:    * Function handles all the supported events on all the windows that are
michael@0:    * observed. Method is used to proxy events to the listeners registered on
michael@0:    * this event emitter.
michael@0:    * @param {Event} event
michael@0:    *    Keyboard event being emitted.
michael@0:    */
michael@0:   handleEvent: function handleEvent(event) {
michael@0:     this._emit(event.type, event.target, event);
michael@0:   }
michael@0: });
michael@0: 
michael@0: // Using `WindowTracker` to track window events.
michael@0: WindowTracker({
michael@0:   onTrack: function onTrack(chromeWindow) {
michael@0:     observer._emit("open", chromeWindow);
michael@0:     observer.observe(chromeWindow);
michael@0:   },
michael@0:   onUntrack: function onUntrack(chromeWindow) {
michael@0:     observer._emit("close", chromeWindow);
michael@0:     observer.ignore(chromeWindow);
michael@0:   }
michael@0: });
michael@0: 
michael@0: exports.observer = observer;