зеркало из https://github.com/mozilla/gecko-dev.git
113 строки
3.2 KiB
JavaScript
113 строки
3.2 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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var EXPORTED_SYMBOLS = ["HiddenFrame"];
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ChromeUtils.import("resource://gre/modules/PromiseUtils.jsm");
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ChromeUtils.import("resource://gre/modules/Services.jsm");
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const XUL_PAGE = "chrome://global/content/win.xul";
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const gAllHiddenFrames = new WeakSet();
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let cleanupRegistered = false;
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function ensureCleanupRegistered() {
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if (!cleanupRegistered) {
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cleanupRegistered = true;
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Services.obs.addObserver(function() {
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for (let hiddenFrame of ChromeUtils.nondeterministicGetWeakSetKeys(gAllHiddenFrames)) {
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hiddenFrame.destroy();
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}
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}, "xpcom-shutdown");
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}
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}
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/**
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* An hidden frame object. It takes care of creating a windowless browser and
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* passing the window containing a blank XUL <window> back.
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*/
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function HiddenFrame() {
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}
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HiddenFrame.prototype = {
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_frame: null,
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_browser: null,
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_listener: null,
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_webProgress: null,
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_deferred: null,
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/**
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* Gets the |contentWindow| of the hidden frame. Creates the frame if needed.
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* @returns Promise Returns a promise which is resolved when the hidden frame has finished
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* loading.
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*/
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get() {
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if (!this._deferred) {
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this._deferred = PromiseUtils.defer();
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this._create();
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}
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return this._deferred.promise;
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},
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/**
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* Fetch a sync ref to the window inside the frame (needed for the add-on SDK).
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*/
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getWindow() {
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this.get();
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return this._browser.document.ownerGlobal;
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},
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destroy() {
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if (this._browser) {
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if (this._listener) {
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this._webProgress.removeProgressListener(this._listener);
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this._listener = null;
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this._webProgress = null;
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}
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this._frame = null;
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this._deferred = null;
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gAllHiddenFrames.delete(this);
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this._browser.close();
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this._browser = null;
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}
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},
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_create() {
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ensureCleanupRegistered();
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this._browser = Services.appShell.createWindowlessBrowser(true);
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this._browser.QueryInterface(Ci.nsIInterfaceRequestor);
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gAllHiddenFrames.add(this);
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this._webProgress = this._browser.getInterface(Ci.nsIWebProgress);
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this._listener = {
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QueryInterface: ChromeUtils.generateQI([
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Ci.nsIWebProgressListener, Ci.nsIWebProgressListener2,
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Ci.nsISupportsWeakReference]),
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};
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this._listener.onStateChange = (wbp, request, stateFlags, status) => {
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if (!request) {
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return;
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}
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if (stateFlags & Ci.nsIWebProgressListener.STATE_STOP) {
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this._webProgress.removeProgressListener(this._listener);
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this._listener = null;
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this._webProgress = null;
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// Get the window reference via the document.
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this._frame = this._browser.document.ownerGlobal;
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this._deferred.resolve(this._frame);
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}
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};
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this._webProgress.addProgressListener(this._listener, Ci.nsIWebProgress.NOTIFY_STATE_DOCUMENT);
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let docShell = this._browser.docShell;
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docShell.createAboutBlankContentViewer(Services.scriptSecurityManager.getSystemPrincipal());
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docShell.useGlobalHistory = false;
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this._browser.loadURI(XUL_PAGE, 0, null, null, null);
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}
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};
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