ash/shelf/shelf_model_observer.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_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
  11 namespace ash {
  12
  13 struct ShelfItem;
  14
  15 class 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_