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