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/* 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";
module.metadata = {
"stability": "unstable"
};
const { Class } = require("../core/heritage");
const { EventTarget } = require("../event/target");
const { emit } = require("../event/core");
const { DOMEventAssembler } = require("../deprecated/events/assembler");
const { browserWindowIterator } = require('../deprecated/window-utils');
const { isBrowser } = require('../window/utils');
const { observer: windowObserver } = require("../windows/observer");
// Event emitter objects used to register listeners and emit events on them
// when they occur.
const Observer = Class({
implements: [DOMEventAssembler, EventTarget],
initialize() {
// Adding each opened window to a list of observed windows.
windowObserver.on("open", window => {
if (isBrowser(window))
this.observe(window);
});
// Removing each closed window form the list of observed windows.
windowObserver.on("close", window => {
if (isBrowser(window))
this.ignore(window);
});
// Making observer aware of already opened windows.
for (let window of browserWindowIterator()) {
this.observe(window);
}
},
/**
* Events that are supported and emitted by the module.
*/
supportedEventsTypes: [ "keydown", "keyup", "keypress" ],
/**
* 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(event) {
emit(this, event.type, event, event.target.ownerDocument ? event.target.ownerDocument.defaultView
: undefined);
}
});
exports.observer = new Observer();
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