The Tor Browser / file comparison
comparison: addon-sdk/source/lib/sdk/tabs/observer.js
addon-sdk/source/lib/sdk/tabs/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 'use strict'; | |
| 5 | |
| 6 module.metadata = { | |
| 7 "stability": "unstable" | |
| 8 }; | |
| 9 | |
| 10 const { EventEmitterTrait: EventEmitter } = require("../deprecated/events"); | |
| 11 const { DOMEventAssembler } = require("../deprecated/events/assembler"); | |
| 12 const { Trait } = require("../deprecated/light-traits"); | |
| 13 const { getActiveTab, getTabs, getTabContainer } = require("./utils"); | |
| 14 const { browserWindowIterator } = require("../deprecated/window-utils"); | |
| 15 const { isBrowser } = require('../window/utils'); | |
| 16 const { observer: windowObserver } = require("../windows/observer"); | |
| 17 | |
| 18 const EVENTS = { | |
| 19 "TabOpen": "open", | |
| 20 "TabClose": "close", | |
| 21 "TabSelect": "select", | |
| 22 "TabMove": "move", | |
| 23 "TabPinned": "pinned", | |
| 24 "TabUnpinned": "unpinned" | |
| 25 }; | |
| 26 | |
| 27 | |
| 28 // Event emitter objects used to register listeners and emit events on them | |
| 29 // when they occur. | |
| 30 const observer = Trait.compose(DOMEventAssembler, EventEmitter).create({ | |
| 31 /** | |
| 32 * Method is implemented by `EventEmitter` and is used just for emitting | |
| 33 * events on registered listeners. | |
| 34 */ | |
| 35 _emit: Trait.required, | |
| 36 /** | |
| 37 * Events that are supported and emitted by the module. | |
| 38 */ | |
| 39 supportedEventsTypes: Object.keys(EVENTS), | |
| 40 /** | |
| 41 * Function handles all the supported events on all the windows that are | |
| 42 * observed. Method is used to proxy events to the listeners registered on | |
| 43 * this event emitter. | |
| 44 * @param {Event} event | |
| 45 * Keyboard event being emitted. | |
| 46 */ | |
| 47 handleEvent: function handleEvent(event) { | |
| 48 this._emit(EVENTS[event.type], event.target, event); | |
| 49 } | |
| 50 }); | |
| 51 | |
| 52 // Currently Gecko does not dispatch any event on the previously selected | |
| 53 // tab before / after "TabSelect" is dispatched. In order to work around this | |
| 54 // limitation we keep track of selected tab and emit "deactivate" event with | |
| 55 // that before emitting "activate" on selected tab. | |
| 56 var selectedTab = null; | |
| 57 function onTabSelect(tab) { | |
| 58 if (selectedTab !== tab) { | |
| 59 if (selectedTab) observer._emit('deactivate', selectedTab); | |
| 60 if (tab) observer._emit('activate', selectedTab = tab); | |
| 61 } | |
| 62 }; | |
| 63 observer.on('select', onTabSelect); | |
| 64 | |
| 65 // We also observe opening / closing windows in order to add / remove it's | |
| 66 // containers to the observed list. | |
| 67 function onWindowOpen(chromeWindow) { | |
| 68 if (!isBrowser(chromeWindow)) return; // Ignore if it's not a browser window. | |
| 69 observer.observe(getTabContainer(chromeWindow)); | |
| 70 } | |
| 71 windowObserver.on("open", onWindowOpen); | |
| 72 | |
| 73 function onWindowClose(chromeWindow) { | |
| 74 if (!isBrowser(chromeWindow)) return; // Ignore if it's not a browser window. | |
| 75 // Bug 751546: Emit `deactivate` event on window close immediatly | |
| 76 // Otherwise we are going to face "dead object" exception on `select` event | |
| 77 if (getActiveTab(chromeWindow) == selectedTab) { | |
| 78 observer._emit("deactivate", selectedTab); | |
| 79 selectedTab = null; | |
| 80 } | |
| 81 observer.ignore(getTabContainer(chromeWindow)); | |
| 82 } | |
| 83 windowObserver.on("close", onWindowClose); | |
| 84 | |
| 85 | |
| 86 // Currently gecko does not dispatches "TabSelect" events when different | |
| 87 // window gets activated. To work around this limitation we emulate "select" | |
| 88 // event for this case. | |
| 89 windowObserver.on("activate", function onWindowActivate(chromeWindow) { | |
| 90 if (!isBrowser(chromeWindow)) return; // Ignore if it's not a browser window. | |
| 91 observer._emit("select", getActiveTab(chromeWindow)); | |
| 92 }); | |
| 93 | |
| 94 // We should synchronize state, since probably we already have at least one | |
| 95 // window open. | |
| 96 for each (let window in browserWindowIterator()) onWindowOpen(window); | |
| 97 | |
| 98 exports.observer = observer; |
