The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/addon-sdk/source/lib/sdk/tabs/observer.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,98 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +'use strict';
     1.8 +
     1.9 +module.metadata = {
    1.10 +  "stability": "unstable"
    1.11 +};
    1.12 +
    1.13 +const { EventEmitterTrait: EventEmitter } = require("../deprecated/events");
    1.14 +const { DOMEventAssembler } = require("../deprecated/events/assembler");
    1.15 +const { Trait } = require("../deprecated/light-traits");
    1.16 +const { getActiveTab, getTabs, getTabContainer } = require("./utils");
    1.17 +const { browserWindowIterator } = require("../deprecated/window-utils");
    1.18 +const { isBrowser } = require('../window/utils');
    1.19 +const { observer: windowObserver } = require("../windows/observer");
    1.20 +
    1.21 +const EVENTS = {
    1.22 +  "TabOpen": "open",
    1.23 +  "TabClose": "close",
    1.24 +  "TabSelect": "select",
    1.25 +  "TabMove": "move",
    1.26 +  "TabPinned": "pinned",
    1.27 +  "TabUnpinned": "unpinned"
    1.28 +};
    1.29 +
    1.30 +
    1.31 +// Event emitter objects used to register listeners and emit events on them
    1.32 +// when they occur.
    1.33 +const observer = Trait.compose(DOMEventAssembler, EventEmitter).create({
    1.34 +  /**
    1.35 +   * Method is implemented by `EventEmitter` and is used just for emitting
    1.36 +   * events on registered listeners.
    1.37 +   */
    1.38 +  _emit: Trait.required,
    1.39 +  /**
    1.40 +   * Events that are supported and emitted by the module.
    1.41 +   */
    1.42 +  supportedEventsTypes: Object.keys(EVENTS),
    1.43 +  /**
    1.44 +   * Function handles all the supported events on all the windows that are
    1.45 +   * observed. Method is used to proxy events to the listeners registered on
    1.46 +   * this event emitter.
    1.47 +   * @param {Event} event
    1.48 +   *    Keyboard event being emitted.
    1.49 +   */
    1.50 +  handleEvent: function handleEvent(event) {
    1.51 +    this._emit(EVENTS[event.type], event.target, event);
    1.52 +  }
    1.53 +});
    1.54 +
    1.55 +// Currently Gecko does not dispatch any event on the previously selected
    1.56 +// tab before / after "TabSelect" is dispatched. In order to work around this
    1.57 +// limitation we keep track of selected tab and emit "deactivate" event with
    1.58 +// that before emitting "activate" on selected tab.
    1.59 +var selectedTab = null;
    1.60 +function onTabSelect(tab) {
    1.61 +  if (selectedTab !== tab) {
    1.62 +    if (selectedTab) observer._emit('deactivate', selectedTab);
    1.63 +    if (tab) observer._emit('activate', selectedTab = tab);
    1.64 +  }
    1.65 +};
    1.66 +observer.on('select', onTabSelect);
    1.67 +
    1.68 +// We also observe opening / closing windows in order to add / remove it's
    1.69 +// containers to the observed list.
    1.70 +function onWindowOpen(chromeWindow) {
    1.71 +  if (!isBrowser(chromeWindow)) return; // Ignore if it's not a browser window.
    1.72 +  observer.observe(getTabContainer(chromeWindow));
    1.73 +}
    1.74 +windowObserver.on("open", onWindowOpen);
    1.75 +
    1.76 +function onWindowClose(chromeWindow) {
    1.77 +  if (!isBrowser(chromeWindow)) return; // Ignore if it's not a browser window.
    1.78 +  // Bug 751546: Emit `deactivate` event on window close immediatly
    1.79 +  // Otherwise we are going to face "dead object" exception on `select` event
    1.80 +  if (getActiveTab(chromeWindow) == selectedTab) {
    1.81 +    observer._emit("deactivate", selectedTab);
    1.82 +    selectedTab = null;
    1.83 +  }
    1.84 +  observer.ignore(getTabContainer(chromeWindow));
    1.85 +}
    1.86 +windowObserver.on("close", onWindowClose);
    1.87 +
    1.88 +
    1.89 +// Currently gecko does not dispatches "TabSelect" events when different
    1.90 +// window gets activated. To work around this limitation we emulate "select"
    1.91 +// event for this case.
    1.92 +windowObserver.on("activate", function onWindowActivate(chromeWindow) {
    1.93 +  if (!isBrowser(chromeWindow)) return; // Ignore if it's not a browser window.
    1.94 +  observer._emit("select", getActiveTab(chromeWindow));
    1.95 +});
    1.96 +
    1.97 +// We should synchronize state, since probably we already have at least one
    1.98 +// window open.
    1.99 +for each (let window in browserWindowIterator()) onWindowOpen(window);
   1.100 +
   1.101 +exports.observer = observer;