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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef VIEWS_FOCUS_VIEW_STORAGE_H_ | 5 #ifndef VIEWS_FOCUS_VIEW_STORAGE_H_ |
6 #define VIEWS_FOCUS_VIEW_STORAGE_H_ | 6 #define VIEWS_FOCUS_VIEW_STORAGE_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "base/memory/singleton.h" | 9 #include "ui/views/focus/view_storage.h" |
10 #include "views/view.h" | 10 // TODO(tfarina): remove this file once all includes have been updated. |
11 | |
12 // This class is a simple storage place for storing/retrieving views. It is | |
13 // used for example in the FocusManager to store/restore focused views when the | |
14 // main window becomes active/inactive. | |
15 // It automatically removes a view from the storage if the view is removed from | |
16 // the tree hierarchy. | |
17 // | |
18 // To use it, you first need to create a view storage id that can then be used | |
19 // to store/retrieve views. | |
20 | |
21 namespace views { | |
22 | |
23 class VIEWS_EXPORT ViewStorage { | |
24 public: | |
25 // Returns the global ViewStorage instance. | |
26 // It is guaranted to be non NULL. | |
27 static ViewStorage* GetInstance(); | |
28 | |
29 // Returns a unique storage id that can be used to store/retrieve views. | |
30 int CreateStorageID(); | |
31 | |
32 // Associates |view| with the specified |storage_id|. | |
33 void StoreView(int storage_id, View* view); | |
34 | |
35 // Returns the view associated with |storage_id| if any, NULL otherwise. | |
36 View* RetrieveView(int storage_id); | |
37 | |
38 // Removes the view associated with |storage_id| if any. | |
39 void RemoveView(int storage_id); | |
40 | |
41 // Notifies the ViewStorage that a view was removed from its parent somewhere. | |
42 void ViewRemoved(View* removed); | |
43 | |
44 size_t view_count() const { return view_to_ids_.size(); } | |
45 | |
46 private: | |
47 friend struct DefaultSingletonTraits<ViewStorage>; | |
48 | |
49 ViewStorage(); | |
50 ~ViewStorage(); | |
51 | |
52 // Removes the view associated with |storage_id|. If |remove_all_ids| is true, | |
53 // all other mapping pointing to the same view are removed as well. | |
54 void EraseView(int storage_id, bool remove_all_ids); | |
55 | |
56 // Next id for the view storage. | |
57 int view_storage_next_id_; | |
58 | |
59 // The association id to View used for the view storage. | |
60 std::map<int, View*> id_to_view_; | |
61 | |
62 // Association View to id, used to speed up view notification removal. | |
63 std::map<View*, std::vector<int>*> view_to_ids_; | |
64 | |
65 DISALLOW_COPY_AND_ASSIGN(ViewStorage); | |
66 }; | |
67 | |
68 } // namespace views | |
69 | 11 |
70 #endif // VIEWS_FOCUS_VIEW_STORAGE_H_ | 12 #endif // VIEWS_FOCUS_VIEW_STORAGE_H_ |
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