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comparison: addon-sdk/source/lib/sdk/keyboard/observer.js
addon-sdk/source/lib/sdk/keyboard/observer.js
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 "use strict"; | |
| 6 | |
| 7 module.metadata = { | |
| 8 "stability": "unstable" | |
| 9 }; | |
| 10 | |
| 11 const { Trait } = require("../deprecated/light-traits"); | |
| 12 const { EventEmitterTrait: EventEmitter } = require("../deprecated/events"); | |
| 13 const { DOMEventAssembler } = require("../deprecated/events/assembler"); | |
| 14 const { browserWindowIterator } = require('../deprecated/window-utils'); | |
| 15 const { isBrowser } = require('../window/utils'); | |
| 16 const { observer: windowObserver } = require("../windows/observer"); | |
| 17 | |
| 18 // Event emitter objects used to register listeners and emit events on them | |
| 19 // when they occur. | |
| 20 const observer = Trait.compose(DOMEventAssembler, EventEmitter).create({ | |
| 21 /** | |
| 22 * Method is implemented by `EventEmitter` and is used just for emitting | |
| 23 * events on registered listeners. | |
| 24 */ | |
| 25 _emit: Trait.required, | |
| 26 /** | |
| 27 * Events that are supported and emitted by the module. | |
| 28 */ | |
| 29 supportedEventsTypes: [ "keydown", "keyup", "keypress" ], | |
| 30 /** | |
| 31 * Function handles all the supported events on all the windows that are | |
| 32 * observed. Method is used to proxy events to the listeners registered on | |
| 33 * this event emitter. | |
| 34 * @param {Event} event | |
| 35 * Keyboard event being emitted. | |
| 36 */ | |
| 37 handleEvent: function handleEvent(event) { | |
| 38 this._emit(event.type, event, event.target.ownerDocument.defaultView); | |
| 39 } | |
| 40 }); | |
| 41 | |
| 42 // Adding each opened window to a list of observed windows. | |
| 43 windowObserver.on("open", function onOpen(window) { | |
| 44 if (isBrowser(window)) | |
| 45 observer.observe(window); | |
| 46 }); | |
| 47 // Removing each closed window form the list of observed windows. | |
| 48 windowObserver.on("close", function onClose(window) { | |
| 49 if (isBrowser(window)) | |
| 50 observer.ignore(window); | |
| 51 }); | |
| 52 | |
| 53 // Making observer aware of already opened windows. | |
| 54 for each (let window in browserWindowIterator()) | |
| 55 observer.observe(window); | |
| 56 | |
| 57 exports.observer = observer; |
