Made notification center notifications collapsed and expandable.

ui/message_center/notification_view.h

 // 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.
 
 #ifndef UI_MESSAGE_CENTER_NOTIFICATION_VIEW_H_
 #define UI_MESSAGE_CENTER_NOTIFICATION_VIEW_H_
 
+#include <vector>
+
 #include "ui/message_center/message_view.h"
 #include "ui/message_center/notification_list.h"
 
 namespace message_center {
 
 // View that displays all current types of notification (web, basic, image, and
 // list). Future notification types may be handled by other classes, in which
-// case instances of those classes would be returned by the
-// ViewForNotification() factory method below.
+// case instances of those classes would be returned by the Create() factory
+// method below.
 class NotificationView : public MessageView {
  public:
   // Creates appropriate MessageViews for notifications. Those currently are
-  // always NotificationView instances but in the future may be instances of
-  // other classes, with the class depending on the notification type.
+  // always NotificationView or MessageSimpleView instances but in the future
+  // may be instances of other classes, with the class depending on the
+  // notification type.
   static MessageView* Create(const Notification& notification,
-                             NotificationList::Delegate* list_delegate);
+                             NotificationList::Delegate* delegate,
+                             bool expanded);
 
   virtual ~NotificationView();
 
-  // Overridden from View.
+  // Overridden from views::View:
   virtual void Layout() OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
 
-  // Overridden from MessageView.
+  // Overridden from MessageView:
+  virtual void Update(const Notification& notification) OVERRIDE;
   virtual void ButtonPressed(views::Button* sender,
                              const ui::Event& event) OVERRIDE;
 
  private:
-  NotificationView(NotificationList::Delegate* list_delegate,
-                   const Notification& notification);
+  NotificationView(const Notification& notification,
+                   NotificationList::Delegate* delegate,
+                   bool expanded);
 
-  views::View* MakeContentView(const Notification& notification);
+  void AddChildViews(const Notification& notification);
+  void AddContentView(const Notification& notification);
 
   views::View* content_view_;
+  views::ImageView* icon_view_;
   std::vector<views::Button*> action_buttons_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationView);
 };
 
 }  // namespace message_center
 
 #endif // UI_MESSAGE_CENTER_NOTIFICATION_VIEW_H_