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 #include "base/observer_list.h"
  16
  17 namespace ash {
  18 class ShelfItemDelegate;
  19 class ShelfModel;
  20
  21 namespace test {
  22 class ShelfItemDelegateManagerTestAPI;
  23 }
  24
  25 // This class is added as a temporary fix for M39 to fix crbug.com/329597.
  26 // TODO(skuhne): Find the real reason for this problem and remove this fix.
  27 class ASH_EXPORT ShelfItemDelegateManagerObserver {
  28  public:
  29   ShelfItemDelegateManagerObserver() {}
  30   virtual ~ShelfItemDelegateManagerObserver() {}
  31
  32   // Gets called when a ShelfItemDelegate gets changed. Note that
  33   // |item_delegate| can be NULL.
  34   virtual void OnSetShelfItemDelegate(ShelfID id,
  35                                       ShelfItemDelegate* item_delegate) = 0;
  36 };
  37
  38 // ShelfItemDelegateManager manages the set of ShelfItemDelegates for the
  39 // launcher. ShelfItemDelegateManager does not create ShelfItemDelegates,
  40 // rather it is expected that someone else invokes SetShelfItemDelegate
  41 // appropriately. On the other hand, ShelfItemDelegateManager destroys
  42 // ShelfItemDelegates when the corresponding item from the model is removed.
  43 class ASH_EXPORT ShelfItemDelegateManager : public ShelfModelObserver {
  44  public:
  45   explicit ShelfItemDelegateManager(ShelfModel* model);
  46   ~ShelfItemDelegateManager() override;
  47
  48   void AddObserver(ShelfItemDelegateManagerObserver* observer);
  49   void RemoveObserver(ShelfItemDelegateManagerObserver* observer);
  50
  51   // Set |item_delegate| for |id| and take an ownership.
  52   void SetShelfItemDelegate(ShelfID id,
  53                             scoped_ptr<ShelfItemDelegate> item_delegate);
  54
  55   // Returns ShelfItemDelegate for |item_type|. Always returns non-NULL.
  56   ShelfItemDelegate* GetShelfItemDelegate(ShelfID id);
  57
  58   // ShelfModelObserver overrides:
  59   void ShelfItemAdded(int model_index) override;
  60   void ShelfItemRemoved(int index, ShelfID id) override;
  61   void ShelfItemMoved(int start_index, int targetindex) override;
  62   void ShelfItemChanged(int index, const ShelfItem& old_item) override;
  63   void ShelfStatusChanged() override;
  64
  65  private:
  66   friend class test::ShelfItemDelegateManagerTestAPI;
  67
  68   typedef std::map<ShelfID, ShelfItemDelegate*> ShelfIDToItemDelegateMap;
  69
  70   // Remove and destroy ShelfItemDelegate for |id|.
  71   void RemoveShelfItemDelegate(ShelfID id);
  72
  73   // Owned by Shell.
  74   ShelfModel* model_;
  75
  76   ShelfIDToItemDelegateMap id_to_item_delegate_map_;
  77
  78   base::ObserverList<ShelfItemDelegateManagerObserver> observers_;
  79
  80   DISALLOW_COPY_AND_ASSIGN(ShelfItemDelegateManager);
  81 };
  82
  83 }  // namespace ash
  84
  85 #endif  // ASH_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_