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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This module implements the registration of guestview elements when
// permissions are not available. These elements exist only to provide a useful
// error message when developers attempt to use them.
var DocumentNatives = requireNative('document_natives');
var GuestViewContainer = require('guestViewContainer').GuestViewContainer;
var ERROR_MESSAGE = 'You do not have permission to use the %1 element.' +
' Be sure to declare the "%1" permission in your manifest file.';
// A list of view types that will have custom elements registered if they are
// not already registered by the time this module is loaded.
var VIEW_TYPES = [
'AppView',
'ExtensionOptions',
'ExtensionView',
'WebView'
];
// Registers a GuestView custom element.
function registerGuestViewElement(viewType) {
var proto = Object.create(HTMLElement.prototype);
proto.createdCallback = function() {
window.console.error(ERROR_MESSAGE.replace(/%1/g, viewType.toLowerCase()));
};
window[viewType] = DocumentNatives.RegisterElement(viewType.toLowerCase(),
{prototype: proto});
// Delete the callbacks so developers cannot call them and produce unexpected
// behavior.
delete proto.createdCallback;
delete proto.attachedCallback;
delete proto.detachedCallback;
delete proto.attributeChangedCallback;
}
var useCapture = true;
window.addEventListener('readystatechange', function listener(event) {
if (document.readyState == 'loading')
return;
for (var i = 0; i != VIEW_TYPES.length; ++i) {
// Register the error-providing custom element only for those view types
// that have not already been registered. Since this module is always loaded
// last, all the view types that are available (i.e. have the proper
// permissions) will have already been registered on |window|.
if (!window[VIEW_TYPES[i]])
registerGuestViewElement(VIEW_TYPES[i]);
}
window.removeEventListener(event.type, listener, useCapture);
}, useCapture);
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