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# ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D35894 --HG-- extra : source : 4722b924e08478f5337ab509718bd66906bf472f extra : amend_source : a5baa1aab21639fdba44537e3a10b179b0073cb4
77 lines
2.2 KiB
JavaScript
77 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 { Ci } = require("chrome");
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const Services = require("Services");
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const EventEmitter = require("devtools/shared/event-emitter");
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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(targetActor) {
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this._contentWindow = targetActor.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,
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"content-document-global-created"
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);
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Services.obs.addObserver(
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this._onInnerWindowDestroyed,
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"inner-window-destroyed"
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);
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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,
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"content-document-global-created"
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);
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Services.obs.removeObserver(
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this._onInnerWindowDestroyed,
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"inner-window-destroyed"
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);
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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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EventEmitter.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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const id = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
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EventEmitter.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.windowUtils.currentInnerWindowID;
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};
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