Signin screen and locked screen status area focus advancing

chrome/browser/chromeos/login/ui/webui_login_view.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEBUI_LOGIN_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEBUI_LOGIN_VIEW_H_
 
 #include <map>
 #include <string>
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "chrome/browser/ui/chrome_web_modal_dialog_manager_delegate.h"
 #include "components/web_modal/web_contents_modal_dialog_host.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "ui/views/controls/webview/unhandled_keyboard_event_handler.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
 class GURL;
 
+namespace ash {
+class StatusAreaWidgetDelegate;
+}
+
 namespace content {
 class WebUI;
 }
 
 namespace views {
 class View;
 class WebView;
 class Widget;
 }
 
@@ skipping 100 matching lines @@
                                   content::MediaStreamType type) override;
   bool PreHandleGestureEvent(content::WebContents* source,
                              const blink::WebGestureEvent& event) override;
 
   // Performs series of actions when login prompt is considered
   // to be ready and visible.
   // 1. Emits LoginPromptVisible signal if needed
   // 2. Notifies OOBE/sign classes.
   void OnLoginPromptVisible();
 
+  // Return if status area widget delegate exists, otherwise nullptr.
+  ash::StatusAreaWidgetDelegate* GetStatusAreaWidgetDelegate();

[xiyuan, 2016/09/13 21:48:08]

Move this to cc file in anonymous namespace since it is impl detail and outside
world does not need to know about it.

[Qiang(Joe) Xu, 2016/09/13 21:54:57]

done

+
   content::NotificationRegistrar registrar_;
 
   // Converts keyboard events on the WebContents to accelerators.
   views::UnhandledKeyboardEventHandler unhandled_keyboard_event_handler_;
 
   // Maps installed accelerators to OOBE webui accelerator identifiers.
   AccelMap accel_map_;
 
   // True when WebUI is being initialized hidden.
   bool is_hidden_;
 
   // True when the WebUI has finished initializing and is visible.
   bool webui_visible_;
 
   // Should we emit the login-prompt-visible signal when the login page is
   // displayed?
   bool should_emit_login_prompt_visible_;
 
   // True to forward keyboard event.
   bool forward_keyboard_event_;
 
+  // A FocusTraversable for StatusAreaWidget that uses
+  // |status_area_widget_host_| as placeholder in WebUiLoginView's focus chain.
+  class StatusAreaFocusTraversable;
+  std::unique_ptr<StatusAreaFocusTraversable> status_area_focus_traversable_;
+  views::View* status_area_widget_host_ = nullptr;
+
+  // A FocusTraversable for WebUILoginView that loops back at the end of its
+  // focus chain.
+  class CycleFocusTraversable;
+  std::unique_ptr<CycleFocusTraversable> cycle_focus_traversable_;
+
   base::ObserverList<web_modal::ModalDialogHostObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUILoginView);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEBUI_LOGIN_VIEW_H_