| // Copyright (c) 2011 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_ |
| #pragma once |
| |
| #include "base/memory/singleton.h" |
| #include "ui/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 automatically removes a view from the storage if the view is removed from |
| // the tree hierarchy. |
| // |
| // To use it, you first need to create a view storage id that can then be used |
| // to store/retrieve views. |
| |
| namespace views { |
| |
| 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_ |