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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_VIEWS_VIEW_STORAGE_H__
+#define CHROME_VIEWS_VIEW_STORAGE_H__
+
+#include "chrome/common/notification_service.h"
+#include "chrome/views/view.h"
+
+// This class is a simple storage place for storing/retrieving views.  It is
+// used for example in the FocusManager to store/restore focused views when the
+// main window becomes active/inactive.  It supports floating views, meaning
+// that when you store a view, it can be retrieved even if it is a floating
+// view or the child of a floating view that has been detached since the view
+// was stored (in which case the floating view is recreated and reattached).
+// It also automatically removes a view from the storage if the view is removed
+// from the tree hierarchy (or in the case of a floating view, if the view
+// containing the floating view is removed).
+//
+// To use it, you first need to create a view storage id that can then be used
+// to store/retrieve views.
+
+namespace ChromeViews {
+
+struct ViewLocationInfo;
+
+class ViewStorage : public NotificationObserver {
+ public:
+  // Returns the global ViewStorage instance.
+  // It is guaranted to be non NULL.
+  static ViewStorage* GetSharedInstance();
+
+  // Deletes the global instance of the ViewStorage.
+  static void DeleteSharedInstance();
+
+  // Returns a unique storage id that can be used to store/retrieve views.
+  int CreateStorageID();
+
+  // Associates |view| with the specified |storage_id|.
+  void StoreView(int storage_id, View* view);
+
+  // Returns the view associated with |storage_id| if any, NULL otherwise.
+  View* RetrieveView(int storage_id);
+
+  // Removes the view associated with |storage_id| if any.
+  void RemoveView(int storage_id);
+
+ private:
+  ViewStorage();
+  ~ViewStorage();
+
+  // NotificationObserver method.
+  void Observe(NotificationType type,
+               const NotificationSource& source,
+               const NotificationDetails& details);
+
+  // Removes the view associated with |storage_id|. If |remove_all_ids| is true,
+  // all other mapping pointing to the same view are removed as well.
+  void EraseView(int storage_id, bool remove_all_ids);
+
+  // Next id for the view storage.
+  int view_storage_next_id_;
+
+  // The association id to View used for the view storage.  The ViewStorage owns
+  // the ViewLocationInfo.
+  std::map<int, ViewLocationInfo*> id_to_view_location_;
+
+  // Association View to id, used to speed up view notification removal.
+  std::map<View*, std::vector<int>*> view_to_ids_;
+
+  // The singleton instance.
+  static ViewStorage* shared_instance_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(ViewStorage);
+};
+
+}
+
+#endif  // #ifndef CHROME_VIEWS_VIEW_STORAGE_H__