mash: Move shelf model and item classes to ash/common/shelf

ash/shelf/shelf_item_delegate_manager.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ASH_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_
-#define ASH_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_
-
-#include <map>
-#include <memory>
-
-#include "ash/ash_export.h"
-#include "ash/shelf/shelf_item_types.h"
-#include "ash/shelf/shelf_model_observer.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/observer_list.h"
-
-namespace ash {
-class ShelfItemDelegate;
-class ShelfModel;
-
-namespace test {
-class ShelfItemDelegateManagerTestAPI;
-}
-
-// This class is added as a temporary fix for M39 to fix crbug.com/329597.
-// TODO(skuhne): Find the real reason for this problem and remove this fix.
-class ASH_EXPORT ShelfItemDelegateManagerObserver {
- public:
-  ShelfItemDelegateManagerObserver() {}
-  virtual ~ShelfItemDelegateManagerObserver() {}
-
-  // Gets called when a ShelfItemDelegate gets changed. Note that
-  // |item_delegate| can be NULL.
-  virtual void OnSetShelfItemDelegate(ShelfID id,
-                                      ShelfItemDelegate* item_delegate) = 0;
-};
-
-// ShelfItemDelegateManager manages the set of ShelfItemDelegates for the
-// launcher. ShelfItemDelegateManager does not create ShelfItemDelegates,
-// rather it is expected that someone else invokes SetShelfItemDelegate
-// appropriately. On the other hand, ShelfItemDelegateManager destroys
-// ShelfItemDelegates when the corresponding item from the model is removed.
-class ASH_EXPORT ShelfItemDelegateManager : public ShelfModelObserver {
- public:
-  explicit ShelfItemDelegateManager(ShelfModel* model);
-  ~ShelfItemDelegateManager() override;
-
-  void AddObserver(ShelfItemDelegateManagerObserver* observer);
-  void RemoveObserver(ShelfItemDelegateManagerObserver* observer);
-
-  // Set |item_delegate| for |id| and take an ownership.
-  void SetShelfItemDelegate(ShelfID id,
-                            std::unique_ptr<ShelfItemDelegate> item_delegate);
-
-  // Returns ShelfItemDelegate for |item_type|. Always returns non-NULL.
-  ShelfItemDelegate* GetShelfItemDelegate(ShelfID id);
-
-  // ShelfModelObserver overrides:
-  void ShelfItemAdded(int model_index) override;
-  void ShelfItemRemoved(int index, ShelfID id) override;
-  void ShelfItemMoved(int start_index, int targetindex) override;
-  void ShelfItemChanged(int index, const ShelfItem& old_item) override;
-
- private:
-  friend class test::ShelfItemDelegateManagerTestAPI;
-
-  typedef std::map<ShelfID, ShelfItemDelegate*> ShelfIDToItemDelegateMap;
-
-  // Remove and destroy ShelfItemDelegate for |id|.
-  void RemoveShelfItemDelegate(ShelfID id);
-
-  // Owned by Shell.
-  ShelfModel* model_;
-
-  ShelfIDToItemDelegateMap id_to_item_delegate_map_;
-
-  base::ObserverList<ShelfItemDelegateManagerObserver> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShelfItemDelegateManager);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_