1// Copyright (c) 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 UI_APP_LIST_APP_LIST_ITEM_LIST_OBSERVER_H_
6#define UI_APP_LIST_APP_LIST_ITEM_LIST_OBSERVER_H_
7
8#include "base/basictypes.h"
9#include "ui/app_list/app_list_export.h"
10
11namespace app_list {
12
13class AppListItem;
14
15class APP_LIST_EXPORT AppListItemListObserver {
16 public:
17  // Triggered after |item| has been added to the list at |index|.
18  virtual void OnListItemAdded(size_t index, AppListItem* item) {}
19
20  // Triggered after an item has been removed from the list at |index|, just
21  // before the item is deleted.
22  virtual void OnListItemRemoved(size_t index, AppListItem* item) {}
23
24  // Triggered after |item| has been moved from |from_index| to |to_index|.
25  // Note: |from_index| may equal |to_index| if only the ordinal has changed.
26  virtual void OnListItemMoved(size_t from_index,
27                               size_t to_index,
28                               AppListItem* item) {}
29
30 protected:
31  virtual ~AppListItemListObserver() {}
32};
33
34}  // namespace app_list
35
36#endif  // UI_APP_LIST_APP_LIST_ITEM_LIST_OBSERVER_H_
37