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_MODEL_OBSERVER_H_
6#define ASH_SHELF_SHELF_MODEL_OBSERVER_H_
7
8#include "ash/ash_export.h"
9#include "ash/shelf/shelf_item_types.h"
10
11namespace ash {
12
13struct ShelfItem;
14
15class ASH_EXPORT ShelfModelObserver {
16 public:
17  // Invoked after an item has been added to the model.
18  virtual void ShelfItemAdded(int index) = 0;
19
20  // Invoked after an item has been removed. |index| is the index the item was
21  // at.
22  virtual void ShelfItemRemoved(int index, ShelfID id) = 0;
23
24  // Invoked after an item has been moved. See ShelfModel::Move() for details
25  // of the arguments.
26  virtual void ShelfItemMoved(int start_index, int target_index) = 0;
27
28  // Invoked when the state of an item changes. |old_item| is the item
29  // before the change.
30  virtual void ShelfItemChanged(int index, const ShelfItem& old_item) = 0;
31
32  // Invoked when shelf status is changed.
33  virtual void ShelfStatusChanged() = 0;
34
35 protected:
36  virtual ~ShelfModelObserver() {}
37};
38
39}  // namespace ash
40
41#endif  // ASH_SHELF_SHELF_MODEL_OBSERVER_H_
42