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1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef ASH_COMMON_SHELF_SHELF_MODEL_H_ | |
6 #define ASH_COMMON_SHELF_SHELF_MODEL_H_ | |
7 | |
8 #include <map> | |
9 #include <memory> | |
10 | |
11 #include "ash/ash_export.h" | |
12 #include "ash/common/shelf/shelf_item_types.h" | |
13 #include "base/macros.h" | |
14 #include "base/observer_list.h" | |
15 | |
16 namespace ash { | |
17 | |
18 class ShelfItemDelegate; | |
19 class ShelfModelObserver; | |
20 | |
21 // Model used for shelf items. Owns ShelfItemDelegates but does not create them. | |
22 class ASH_EXPORT ShelfModel { | |
23 public: | |
24 ShelfModel(); | |
25 ~ShelfModel(); | |
26 | |
27 // Cleans up the ShelfItemDelegates. | |
28 void DestroyItemDelegates(); | |
29 | |
30 // Adds a new item to the model. Returns the resulting index. | |
31 int Add(const ShelfItem& item); | |
32 | |
33 // Adds the item. |index| is the requested insertion index, which may be | |
34 // modified to meet type-based ordering. Returns the actual insertion index. | |
35 int AddAt(int index, const ShelfItem& item); | |
36 | |
37 // Removes the item at |index|. | |
38 void RemoveItemAt(int index); | |
39 | |
40 // Moves the item at |index| to |target_index|. |target_index| is in terms | |
41 // of the model *after* the item at |index| is removed. | |
42 void Move(int index, int target_index); | |
43 | |
44 // Resets the item at the specified index. The item maintains its existing | |
45 // id and type. | |
46 void Set(int index, const ShelfItem& item); | |
47 | |
48 // Returns the index of the item by id. | |
49 int ItemIndexByID(ShelfID id) const; | |
50 | |
51 // Returns the |index| of the item matching |type| in |items_|. | |
52 // Returns -1 if the matching item is not found. | |
53 // Note: Requires a linear search. | |
54 int GetItemIndexForType(ShelfItemType type); | |
55 | |
56 // Returns the index of the first running application or the index where the | |
57 // first running application would go if there are no running (non pinned) | |
58 // applications yet. | |
59 int FirstRunningAppIndex() const; | |
60 | |
61 // Returns the index of the first panel or the index where the first panel | |
62 // would go if there are no panels. | |
63 int FirstPanelIndex() const; | |
64 | |
65 // Returns the id assigned to the next item added. | |
66 ShelfID next_id() const { return next_id_; } | |
67 | |
68 // Returns a reserved id which will not be used by the |ShelfModel|. | |
69 ShelfID reserve_external_id() { return next_id_++; } | |
70 | |
71 // Returns an iterator into items() for the item with the specified id, or | |
72 // items().end() if there is no item with the specified id. | |
73 ShelfItems::const_iterator ItemByID(ShelfID id) const; | |
74 | |
75 const ShelfItems& items() const { return items_; } | |
76 int item_count() const { return static_cast<int>(items_.size()); } | |
77 | |
78 // Set |item_delegate| for |id| and takes ownership. | |
79 void SetShelfItemDelegate(ShelfID id, | |
80 std::unique_ptr<ShelfItemDelegate> item_delegate); | |
81 | |
82 // Returns ShelfItemDelegate for |id|, or null if none exists. | |
83 ShelfItemDelegate* GetShelfItemDelegate(ShelfID id); | |
84 | |
85 void AddObserver(ShelfModelObserver* observer); | |
86 void RemoveObserver(ShelfModelObserver* observer); | |
87 | |
88 private: | |
89 // Makes sure |index| is in line with the type-based order of items. If that | |
90 // is not the case, adjusts index by shifting it to the valid range and | |
91 // returns the new value. | |
92 int ValidateInsertionIndex(ShelfItemType type, int index) const; | |
93 | |
94 // Remove and destroy ShelfItemDelegate for |id|. | |
95 void RemoveShelfItemDelegate(ShelfID id); | |
96 | |
97 // ID assigned to the next item. | |
98 ShelfID next_id_; | |
99 | |
100 ShelfItems items_; | |
101 base::ObserverList<ShelfModelObserver> observers_; | |
102 | |
103 std::map<ShelfID, std::unique_ptr<ShelfItemDelegate>> | |
104 id_to_item_delegate_map_; | |
105 | |
106 DISALLOW_COPY_AND_ASSIGN(ShelfModel); | |
107 }; | |
108 | |
109 } // namespace ash | |
110 | |
111 #endif // ASH_COMMON_SHELF_SHELF_MODEL_H_ | |
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