1 /* vim: set ts=2 sw=2 sts=2 et tw=80: */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 var EXPORTED_SYMBOLS = ["UAWidgetsChild"];
9 const {ActorChild} = ChromeUtils.import("resource://gre/modules/ActorChild.jsm");
10 const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
12 class UAWidgetsChild extends ActorChild {
13 constructor(dispatcher) {
16 this.widgets = new WeakMap();
20 switch (aEvent.type) {
21 case "UAWidgetSetupOrChange":
22 this.setupOrNotifyWidget(aEvent.target);
24 case "UAWidgetTeardown":
25 this.teardownWidget(aEvent.target);
29 // In case we are a nested frame, prevent the message manager of the
30 // parent frame from receving the event.
31 aEvent.stopPropagation();
34 setupOrNotifyWidget(aElement) {
35 let widget = this.widgets.get(aElement);
37 this.setupWidget(aElement);
40 if (typeof widget.onchange == "function") {
49 setupWidget(aElement) {
52 switch (aElement.localName) {
55 uri = "chrome://global/content/elements/videocontrols.js";
56 widgetName = "VideoControlsWidget";
59 uri = "chrome://global/content/elements/datetimebox.js";
60 widgetName = "DateTimeBoxWidget";
64 uri = "chrome://global/content/elements/pluginProblem.js";
65 widgetName = "PluginProblemWidget";
68 uri = "chrome://global/content/elements/marquee.js";
69 widgetName = "MarqueeWidget";
73 if (!uri || !widgetName) {
74 Cu.reportError("Getting a UAWidgetSetupOrChange event on undefined element.");
78 let shadowRoot = aElement.openOrClosedShadowRoot;
80 Cu.reportError("Getting a UAWidgetSetupOrChange event without the Shadow Root.");
84 let isSystemPrincipal = aElement.nodePrincipal.isSystemPrincipal;
85 let sandbox = isSystemPrincipal ?
86 Object.create(null) : Cu.getUAWidgetScope(aElement.nodePrincipal);
88 if (!sandbox[widgetName]) {
89 Services.scriptloader.loadSubScript(uri, sandbox);
92 let widget = new sandbox[widgetName](shadowRoot);
93 if (!isSystemPrincipal) {
94 widget = widget.wrappedJSObject;
96 this.widgets.set(aElement, widget);
104 teardownWidget(aElement) {
105 let widget = this.widgets.get(aElement);
109 if (typeof widget.destructor == "function") {
116 this.widgets.delete(aElement);