It is time.

ui/views/focus/view_storage.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_VIEWS_FOCUS_VIEW_STORAGE_H_
-#define UI_VIEWS_FOCUS_VIEW_STORAGE_H_
-
-#include <map>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "ui/views/views_export.h"
-
-template <typename T> struct DefaultSingletonTraits;
-
-// 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 automatically removes a view from the storage if the view is removed from
-// the tree hierarchy or when the view is destroyed, which ever comes first.
-//
-// To use it, you first need to create a view storage id that can then be used
-// to store/retrieve views.
-
-namespace views {
-class View;
-
-class VIEWS_EXPORT ViewStorage {
- public:
-  // Returns the global ViewStorage instance.
-  // It is guaranted to be non NULL.
-  static ViewStorage* GetInstance();
-
-  // 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);
-
-  // Notifies the ViewStorage that a view was removed from its parent somewhere.
-  void ViewRemoved(View* removed);
-
-  size_t view_count() const { return view_to_ids_.size(); }
-
- private:
-  friend struct DefaultSingletonTraits<ViewStorage>;
-
-  ViewStorage();
-  ~ViewStorage();
-
-  // 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.
-  std::map<int, View*> id_to_view_;
-
-  // Association View to id, used to speed up view notification removal.
-  std::map<View*, std::vector<int>*> view_to_ids_;
-
-  DISALLOW_COPY_AND_ASSIGN(ViewStorage);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_FOCUS_VIEW_STORAGE_H_