New kiosk UI: handle edge cases

chrome/browser/resources/chromeos/login/screen_gaia_signin.js

 // Copyright (c) 2012 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.
 
 /**
  * @fileoverview Oobe signin screen implementation.
  */
 
 <include src="../../gaia_auth_host/gaia_auth_host.js"></include>
 
@@ skipping 10 matching lines @@
   /** @const */ var NET_ERROR_ABORTED = 3;
 
   /** @const */ var NET_ERROR_DISALLOWED_URL_SCHEME = 301;
 
   return {
     EXTERNAL_API: [
       'loadAuthExtension',
       'updateAuthExtension',
       'setAuthenticatedUserEmail',
       'doReload',
-      'onFrameError'
+      'onFrameError',
+      'updateCancelButtonState'
     ],
 
     /**
      * Frame loading error code (0 - no error).
      * @type {number}
      * @private
      */
     error_: 0,
 
     /**
@@ skipping 24 matching lines @@
     loadingTimer_: undefined,
 
     /**
      * Whether user can cancel Gaia screen.
      * @type {boolean}
      * @private
      */
     cancelAllowed_: undefined,
 
     /**
+     * Whether we should user pods on the login screen.

[dzhioev (left Google), 2014/02/18 14:19:49]

should show?

[Nikita (slow), 2014/02/18 14:23:21]

Done.

+     * @type {boolean}
+     * @private
+     */
+    isShowUsers_: undefined,
+
+    /**
      * SAML password confirmation attempt count.
      * @type {number}
      */
     samlPasswordConfirmAttempt_: 0,
 
     /** @override */
     decorate: function() {
       this.gaiaAuthHost_ = new cr.login.GaiaAuthHost($('signin-frame'));
       this.gaiaAuthHost_.addEventListener(
           'ready', this.onAuthReady_.bind(this));
@@ skipping 204 matching lines @@
       $('createAccount').hidden = !data.createAccount;
       $('guestSignin').hidden = !data.guestSignin;
       $('createManagedUserPane').hidden = !data.managedUsersEnabled;
 
       $('createManagedUserLinkPlaceholder').hidden =
           !data.managedUsersCanCreate;
       $('createManagedUserNoManagerText').hidden = data.managedUsersCanCreate;
       $('createManagedUserNoManagerText').textContent =
           data.managedUsersRestrictionReason;
 
-      // Allow cancellation of screen only when user pods can be displayed.
-      this.cancelAllowed_ = data.isShowUsers && $('pod-row').pods.length;
-      $('login-header-bar').allowCancel = this.cancelAllowed_;
+      this.isShowUsers_ = data.isShowUsers;
+      this.updateCancelButtonState();
 
       // Sign-in right panel is hidden if all of its items are hidden.
       var noRightPanel = $('gaia-signin-reason').hidden &&
                          $('createAccount').hidden &&
                          $('guestSignin').hidden &&
                          $('createManagedUserPane').hidden;
       this.classList.toggle('no-right-panel', noRightPanel);
       if (Oobe.getInstance().currentScreen === this)
         Oobe.getInstance().updateScreenSize(this);
     },
 
     /**
      * Sends the authenticated user's e-mail address to the auth extension.
      * @param {number} attemptToken The opaque token provided to
      *     onRetrieveAuthenticatedUserEmail_.
      * @param {string} email The authenticated user's e-mail address.
      */
     setAuthenticatedUserEmail: function(attemptToken, email) {
       this.gaiaAuthHost_.setAuthenticatedUserEmail(attemptToken, email);
     },
 
     /**
+     * Updates [Cancel] button state. Allow cancellation of screen only when
+     * user pods can be displayed.
+     */
+    updateCancelButtonState: function() {
+      this.cancelAllowed_ = this.isShowUsers_ && $('pod-row').pods.length;
+      $('login-header-bar').allowCancel = this.cancelAllowed_;
+    },
+
+    /**
      * Whether the current auth flow is SAML.
      */
     isSAML: function() {
        return this.gaiaAuthHost_.authFlow ==
            cr.login.GaiaAuthHost.AuthFlow.SAML;
     },
 
     /**
      * Invoked when the authFlow property is changed no the gaia host.
      * @param {Event} e Property change event.
@@ skipping 267 matching lines @@
           url.indexOf('http://') == 0 &&
           this.gaiaAuthParams_.gaiaUrl.indexOf('https://') == 0) {
         error = NET_ERROR_DISALLOWED_URL_SCHEME;
         this.showFatalAuthError();
       }
       this.error_ = error;
       chrome.send('frameLoadingCompleted', [this.error_]);
     },
   };
 });