ash/shelf/shelf_item_delegate_manager.h

   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_