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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_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_
      6 #define ASH_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_
      7 
      8 #include <map>
      9 
     10 #include "ash/ash_export.h"
     11 #include "ash/shelf/shelf_item_types.h"
     12 #include "ash/shelf/shelf_model_observer.h"
     13 #include "base/compiler_specific.h"
     14 #include "base/memory/scoped_ptr.h"
     15 
     16 namespace ash {
     17 class ShelfItemDelegate;
     18 class ShelfModel;
     19 
     20 namespace test {
     21 class ShelfItemDelegateManagerTestAPI;
     22 }
     23 
     24 // ShelfItemDelegateManager manages the set of ShelfItemDelegates for the
     25 // launcher. ShelfItemDelegateManager does not create ShelfItemDelegates,
     26 // rather it is expected that someone else invokes SetShelfItemDelegate
     27 // appropriately. On the other hand, ShelfItemDelegateManager destroys
     28 // ShelfItemDelegates when the corresponding item from the model is removed.
     29 class ASH_EXPORT ShelfItemDelegateManager : public ShelfModelObserver {
     30  public:
     31   explicit ShelfItemDelegateManager(ShelfModel* model);
     32   virtual ~ShelfItemDelegateManager();
     33 
     34   // Set |item_delegate| for |id| and take an ownership.
     35   void SetShelfItemDelegate(ShelfID id,
     36                             scoped_ptr<ShelfItemDelegate> item_delegate);
     37 
     38   // Returns ShelfItemDelegate for |item_type|. Always returns non-NULL.
     39   ShelfItemDelegate* GetShelfItemDelegate(ShelfID id);
     40 
     41   // ShelfModelObserver overrides:
     42   virtual void ShelfItemAdded(int model_index) OVERRIDE;
     43   virtual void ShelfItemRemoved(int index, ShelfID id) OVERRIDE;
     44   virtual void ShelfItemMoved(int start_index, int targetindex) OVERRIDE;
     45   virtual void ShelfItemChanged(int index,
     46                                 const ShelfItem& old_item) OVERRIDE;
     47   virtual void ShelfStatusChanged() OVERRIDE;
     48 
     49  private:
     50   friend class test::ShelfItemDelegateManagerTestAPI;
     51 
     52   typedef std::map<ShelfID, ShelfItemDelegate*> ShelfIDToItemDelegateMap;
     53 
     54   // Remove and destroy ShelfItemDelegate for |id|.
     55   void RemoveShelfItemDelegate(ShelfID id);
     56 
     57   // Owned by Shell.
     58   ShelfModel* model_;
     59 
     60   ShelfIDToItemDelegateMap id_to_item_delegate_map_;
     61 
     62   DISALLOW_COPY_AND_ASSIGN(ShelfItemDelegateManager);
     63 };
     64 
     65 }  // namespace ash
     66 
     67 #endif  // ASH_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_
     68