mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-05 03:54:35 +00:00
73 lines
2.3 KiB
JavaScript
73 lines
2.3 KiB
JavaScript
/* 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, Cu, Cr} = require("chrome");
|
|
const {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
|
|
|
|
const events = require("sdk/event/core");
|
|
const {Promise: promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
|
|
|
|
/**
|
|
* Handles adding an observer for the creation of content document globals,
|
|
* event sent immediately after a web content document window has been set up,
|
|
* but before any script code has been executed.
|
|
*/
|
|
function ContentObserver(tabActor) {
|
|
this._contentWindow = tabActor.window;
|
|
this._onContentGlobalCreated = this._onContentGlobalCreated.bind(this);
|
|
this._onInnerWindowDestroyed = this._onInnerWindowDestroyed.bind(this);
|
|
this.startListening();
|
|
}
|
|
|
|
module.exports.ContentObserver = ContentObserver;
|
|
|
|
ContentObserver.prototype = {
|
|
/**
|
|
* Starts listening for the required observer messages.
|
|
*/
|
|
startListening: function() {
|
|
Services.obs.addObserver(
|
|
this._onContentGlobalCreated, "content-document-global-created", false);
|
|
Services.obs.addObserver(
|
|
this._onInnerWindowDestroyed, "inner-window-destroyed", false);
|
|
},
|
|
|
|
/**
|
|
* Stops listening for the required observer messages.
|
|
*/
|
|
stopListening: function() {
|
|
Services.obs.removeObserver(
|
|
this._onContentGlobalCreated, "content-document-global-created", false);
|
|
Services.obs.removeObserver(
|
|
this._onInnerWindowDestroyed, "inner-window-destroyed", false);
|
|
},
|
|
|
|
/**
|
|
* Fired immediately after a web content document window has been set up.
|
|
*/
|
|
_onContentGlobalCreated: function(subject, topic, data) {
|
|
if (subject == this._contentWindow) {
|
|
events.emit(this, "global-created", subject);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Fired when an inner window is removed from the backward/forward cache.
|
|
*/
|
|
_onInnerWindowDestroyed: function(subject, topic, data) {
|
|
let id = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
|
|
events.emit(this, "global-destroyed", id);
|
|
}
|
|
};
|
|
|
|
// Utility functions.
|
|
|
|
ContentObserver.GetInnerWindowID = function(window) {
|
|
return window
|
|
.QueryInterface(Ci.nsIInterfaceRequestor)
|
|
.getInterface(Ci.nsIDOMWindowUtils)
|
|
.currentInnerWindowID;
|
|
};
|