ui/app_list/app_list_item_list_observer.h

   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
  11 namespace app_list {
  12
  13 class AppListItem;
  14
  15 class 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_