forked from mirrors/gecko-dev
ecab54a7c9
MozReview-Commit-ID: 7E7LPorrEje --HG-- extra : rebase_source : 0572a35415a766a3f31d266760ecd07f0dcc3f72
86 lines
2.3 KiB
JavaScript
86 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";
|
|
|
|
this.EXPORTED_SYMBOLS = ["HiddenFrame"];
|
|
|
|
const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
|
|
|
|
Cu.import("resource://gre/modules/PromiseUtils.jsm");
|
|
Cu.import("resource://gre/modules/Services.jsm");
|
|
Cu.import("resource://gre/modules/Timer.jsm");
|
|
|
|
const HTML_NS = "http://www.w3.org/1999/xhtml";
|
|
const XUL_PAGE = "data:application/vnd.mozilla.xul+xml;charset=utf-8,<window%20id='win'/>";
|
|
|
|
/**
|
|
* An hidden frame object. It takes care of creating an IFRAME and attaching it the
|
|
* |hiddenDOMWindow|.
|
|
*/
|
|
function HiddenFrame() {}
|
|
|
|
HiddenFrame.prototype = {
|
|
_frame: null,
|
|
_deferred: null,
|
|
_retryTimerId: null,
|
|
|
|
get hiddenDOMDocument() {
|
|
return Services.appShell.hiddenDOMWindow.document;
|
|
},
|
|
|
|
get isReady() {
|
|
return this.hiddenDOMDocument.readyState === "complete";
|
|
},
|
|
|
|
/**
|
|
* Gets the |contentWindow| of the hidden frame. Creates the frame if needed.
|
|
* @returns Promise Returns a promise which is resolved when the hidden frame has finished
|
|
* loading.
|
|
*/
|
|
get() {
|
|
if (!this._deferred) {
|
|
this._deferred = PromiseUtils.defer();
|
|
this._create();
|
|
}
|
|
|
|
return this._deferred.promise;
|
|
},
|
|
|
|
destroy() {
|
|
clearTimeout(this._retryTimerId);
|
|
|
|
if (this._frame) {
|
|
if (!Cu.isDeadWrapper(this._frame)) {
|
|
this._frame.removeEventListener("load", this, true);
|
|
this._frame.remove();
|
|
}
|
|
|
|
this._frame = null;
|
|
this._deferred = null;
|
|
}
|
|
},
|
|
|
|
handleEvent() {
|
|
let contentWindow = this._frame.contentWindow;
|
|
if (contentWindow.location.href === XUL_PAGE) {
|
|
this._frame.removeEventListener("load", this, true);
|
|
this._deferred.resolve(contentWindow);
|
|
} else {
|
|
contentWindow.location = XUL_PAGE;
|
|
}
|
|
},
|
|
|
|
_create() {
|
|
if (this.isReady) {
|
|
let doc = this.hiddenDOMDocument;
|
|
this._frame = doc.createElementNS(HTML_NS, "iframe");
|
|
this._frame.addEventListener("load", this, true);
|
|
doc.documentElement.appendChild(this._frame);
|
|
} else {
|
|
// Check again if |hiddenDOMDocument| is ready as soon as possible.
|
|
this._retryTimerId = setTimeout(this._create.bind(this), 0);
|
|
}
|
|
}
|
|
};
|