72 lines
2.2 KiB
JavaScript
72 lines
2.2 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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const {Cc, Ci, Cu, Cr} = require("chrome");
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const Services = require("Services");
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const events = require("sdk/event/core");
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/**
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* Handles adding an observer for the creation of content document globals,
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* event sent immediately after a web content document window has been set up,
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* but before any script code has been executed.
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*/
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function ContentObserver(tabActor) {
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this._contentWindow = tabActor.window;
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this._onContentGlobalCreated = this._onContentGlobalCreated.bind(this);
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this._onInnerWindowDestroyed = this._onInnerWindowDestroyed.bind(this);
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this.startListening();
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}
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module.exports.ContentObserver = ContentObserver;
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ContentObserver.prototype = {
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/**
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* Starts listening for the required observer messages.
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*/
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startListening: function () {
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Services.obs.addObserver(
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this._onContentGlobalCreated, "content-document-global-created", false);
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Services.obs.addObserver(
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this._onInnerWindowDestroyed, "inner-window-destroyed", false);
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},
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/**
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* Stops listening for the required observer messages.
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*/
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stopListening: function () {
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Services.obs.removeObserver(
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this._onContentGlobalCreated, "content-document-global-created", false);
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Services.obs.removeObserver(
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this._onInnerWindowDestroyed, "inner-window-destroyed", false);
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},
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/**
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* Fired immediately after a web content document window has been set up.
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*/
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_onContentGlobalCreated: function (subject, topic, data) {
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if (subject == this._contentWindow) {
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events.emit(this, "global-created", subject);
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}
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},
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/**
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* Fired when an inner window is removed from the backward/forward cache.
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*/
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_onInnerWindowDestroyed: function (subject, topic, data) {
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let id = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
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events.emit(this, "global-destroyed", id);
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}
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};
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// Utility functions.
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ContentObserver.GetInnerWindowID = function (window) {
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return window
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.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils)
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.currentInnerWindowID;
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};
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