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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";
const { Cc, Ci } = require("chrome");
const { emit, on, once, off } = require("api-utils/event/core");
const { defer } = require("api-utils/functional");
const { when: unload } = require("api-utils/unload");
const observers = require("api-utils/observer-service");
// Model holding a state.
const model = { active: false };
let deferredEmit = defer(emit);
let pbService;
// Currently, only Firefox implements the private browsing service.
if (require("api-utils/xul-app").is("Firefox")) {
pbService = Cc["@mozilla.org/privatebrowsing;1"].
getService(Ci.nsIPrivateBrowsingService);
// Update model state.
model.active = pbService.privateBrowsingEnabled;
// set up an observer for private browsing switches.
observers.add('private-browsing-transition-complete', function onChange() {
// Update model state.
model.active = pbService.privateBrowsingEnabled;
// Emit event with in next turn of event loop.
deferredEmit(exports, model.active ? 'start' : 'stop');
});
}
let setMode = defer(function setMode(value) {
// We toggle private browsing mode asynchronously in order to work around
// bug 659629. Since private browsing transitions are asynchronous
// anyway, this doesn't significantly change the behavior of the API.
pbService.privateBrowsingEnabled = !!value
});
// Make sure listeners are cleaned up.
unload(function() off(exports));
Object.defineProperty(exports, "isActive", { get: function() model.active });
exports.activate = function activate() pbService && setMode(true)
exports.deactivate = function deactivate() pbService && setMode(false)
exports.on = on.bind(null, exports);
exports.once = once.bind(null, exports);
exports.removeListener = function removeListener(type, listener) {
// Note: We can't just bind `off` as we do it for other methods cause skipping
// a listener argument will remove all listeners for the given event type
// causing misbehavior. This way we make sure all arguments are passed.
off(exports, type, listener);
};
// This is workaround making sure that exports is wrapped before it's
// frozen, which needs to happen in order to workaround Bug 673468.
off(exports, 'workaround-bug-673468');
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