Adjust behavior of control buttons of notifications.

ui/message_center/views/message_center_view.h

 // Copyright (c) 2013 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 UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/message_center/message_center_export.h"
 #include "ui/message_center/message_center_observer.h"
 #include "ui/message_center/notification_list.h"
 #include "ui/message_center/views/message_center_controller.h"
 #include "ui/message_center/views/message_list_view.h"
 #include "ui/message_center/views/message_view.h"
+#include "ui/views/focus/focus_manager.h"
 #include "ui/views/view.h"
 
 namespace gfx {
 class MultiAnimation;
 }  // namespace gfx
 
 namespace message_center {
 
 class MessageCenter;
 class MessageCenterButtonBar;
 class MessageCenterTray;
 class MessageView;
 class MessageViewContextMenuController;
 class MessageListView;
 class NotifierSettingsView;
 
 // Container for all the top-level views in the notification center, such as the
 // button bar, settings view, scrol view, and message list view.  Acts as a
 // controller for the message list view, passing data back and forth to message
 // center.
 class MESSAGE_CENTER_EXPORT MessageCenterView
     : public views::View,
       public MessageCenterObserver,
       public MessageCenterController,
       public MessageListView::Observer,
-      public gfx::AnimationDelegate {
+      public gfx::AnimationDelegate,
+      public views::FocusChangeListener {
  public:
   MessageCenterView(MessageCenter* message_center,
                     MessageCenterTray* tray,
                     int max_height,
                     bool initially_settings_visible);
   ~MessageCenterView() override;
 
+  void Init();
+
   void SetNotifications(const NotificationList::Notifications& notifications);
 
   void ClearAllClosableNotifications();
 
   size_t NumMessageViewsForTest() const;
 
   void SetSettingsVisible(bool visible);
   void OnSettingsChanged();
   bool settings_visible() const { return settings_visible_; }
   MessageCenterTray* tray() { return tray_; }
 
   void SetIsClosing(bool is_closing);
 
+  // Overridden from views::FocusChangeListener
+  void OnWillChangeFocus(views::View* before, views::View* now) override {}
+  void OnDidChangeFocus(views::View* before, views::View* now) override;
+
  protected:
   // Potentially sets the reposition target, and then returns whether or not it
   // was was set.
   virtual bool SetRepositionTarget();
 
   // Overridden from views::View:
   void Layout() override;
   gfx::Size GetPreferredSize() const override;
   int GetHeightForWidth(int width) const override;
   bool OnMouseWheel(const ui::MouseWheelEvent& event) override;
@@ skipping 74 matching lines @@
   bool is_closing_;
 
   bool is_clearing_ = false;
   bool is_locked_ = false;
 
   // Current view mode. During animation, it is the target mode.
   Mode mode_ = Mode::BUTTONS_ONLY;
 
   std::unique_ptr<MessageViewContextMenuController> context_menu_controller_;
 
+  views::FocusManager* focus_manager_ = nullptr;
+
   DISALLOW_COPY_AND_ASSIGN(MessageCenterView);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_