Simplifed logic of showing/hiding cancel buttons on login screens.

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.
  */
 
 login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
   // GAIA animation guard timer. Started when GAIA page is loaded
@@ skipping 82 matching lines @@
      * @type {boolean}
      * @private
      */
     showViewProcessed_: undefined,
 
     /**
      * Whether user can cancel Gaia screen.
      * @type {boolean}
      * @private
      */
-    cancelAllowed_: undefined,
+    cancelable_: false,
+    get cancelable() {
+      // TODO(dzhioev): add cancel and refresh buttons hiding logic here.
+      // http://crbug.com/484514
+      return this.cancelable_;
+    },
+    set cancelable(value) {
+      this.cancelable_ = value;
+    },
 
     /**
      * Whether we should show user pods on the login screen.
      * @type {boolean}
      * @private
      */
     isShowUsers_: undefined,
 
     /**
      * SAML password confirmation attempt count.
@@ skipping 394 matching lines @@
       this.classList.toggle('full-width', false);
       if (Oobe.getInstance().currentScreen === this)
         Oobe.getInstance().updateScreenSize(this);
     },
 
     /**
      * Updates [Cancel] button state. Allow cancellation of screen only when
      * user pods can be displayed.
      */
     updateCancelButtonState: function() {
-      this.cancelAllowed_ = this.isLocal ||
-                            (this.isShowUsers_ && $('pod-row').pods.length);
-      $('login-header-bar').allowCancel = this.cancelAllowed_;
-      $('close-button-item').hidden = !this.cancelAllowed_;
+      this.cancelable = this.isLocal ||
+                        (this.isShowUsers_ && $('pod-row').pods.length);
+      $('close-button-item').hidden = !this.cancelable;
     },
 
     /**
      * Whether the current auth flow is SAML.
      */
     isSAML: function() {
        return this.gaiaAuthHost_.authFlow ==
            cr.login.GaiaAuthHost.AuthFlow.SAML;
     },
 
@@ skipping 11 matching lines @@
      * @param {Event} e Property change event.
      */
     onAuthFlowChange_: function(e) {
       var isSAML = this.isSAML();
 
       this.classList.toggle('full-width', isSAML);
       $('saml-notice-container').hidden = !isSAML;
 
       if (Oobe.getInstance().currentScreen === this) {
         Oobe.getInstance().updateScreenSize(this);
-        $('login-header-bar').allowCancel = isSAML || this.cancelAllowed_;
-        $('close-button-item').hidden = !(isSAML || this.cancelAllowed_);
+        $('close-button-item').hidden = !(isSAML || this.cancelable);
       }
     },
 
     /**
      * Invoked when the auth host emits 'ready' event.
      * @private
      */
     onAuthReady_: function() {
       showViewProcessed_ = false;
       this.startLoadAnimationGuardTimer_();
@@ skipping 256 matching lines @@
     },
 
     /**
      * Shows sign-in error bubble.
      * @param {number} loginAttempts Number of login attemps tried.
      * @param {HTMLElement} content Content to show in bubble.
      */
     showErrorBubble: function(loginAttempts, error) {
       if (this.isLocal) {
         $('add-user-button').hidden = true;
-        $('cancel-add-user-button').hidden = false;
         // Reload offline version of the sign-in extension, which will show
         // error itself.
         chrome.send('offlineLogin', [this.email]);
       } else if (!this.loading) {
         // TODO(dzhioev): investigate if this branch ever get hit.
         $('bubble').showContentForElement($('gaia-signin-form-container'),
                                           cr.ui.Bubble.Attachment.LEFT,
                                           error);
       } else {
         // Defer the bubble until the frame has been loaded.
         this.errorBubble_ = [loginAttempts, error];
       }
     },
 
     /**
      * Called when user canceled signin.
      */
     cancel: function() {
-      if (!this.cancelAllowed_) {
+      if (!this.cancelable) {
         // In OOBE signin screen, cancel is not allowed because there is
         // no other screen to show. If user is in middle of a saml flow,
         // reset signin screen to get out of the saml flow.
         if (this.isSAML())
           Oobe.resetSigninUI(true);
 
         return;
       }
 
       $('offline-gaia').switchToEmailCard();
@@ skipping 61 matching lines @@
       }
 
       this.classList.toggle('whitelist-error', show);
       this.loading = !show;
 
       if (!show)
         Oobe.showSigninUI();
     }
   };
 });