58 lines
1.8 KiB
JavaScript
58 lines
1.8 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 { Class } = require("../core/heritage");
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const { EventTarget } = require("../event/target");
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const { emit } = require("../event/core");
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const { DOMEventAssembler } = require("../deprecated/events/assembler");
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const { browserWindowIterator } = require('../deprecated/window-utils');
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const { isBrowser } = require('../window/utils');
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const { observer: windowObserver } = require("../windows/observer");
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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 = Class({
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implements: [DOMEventAssembler, EventTarget],
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initialize() {
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// Adding each opened window to a list of observed windows.
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windowObserver.on("open", window => {
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if (isBrowser(window))
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this.observe(window);
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});
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// Removing each closed window form the list of observed windows.
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windowObserver.on("close", window => {
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if (isBrowser(window))
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this.ignore(window);
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});
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// Making observer aware of already opened windows.
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for (let window of browserWindowIterator()) {
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this.observe(window);
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}
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},
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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: [ "keydown", "keyup", "keypress" ],
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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(event) {
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emit(this, event.type, event, event.target.ownerDocument.defaultView);
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}
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});
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exports.observer = new Observer();
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