ui/base/models/list_model_observer.h

   1 // Copyright (c) 2012 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_BASE_MODELS_LIST_MODEL_OBSERVER_H_
   6 #define UI_BASE_MODELS_LIST_MODEL_OBSERVER_H_
   7
   8 #include <stddef.h>
   9
  10 #include "ui/base/ui_base_export.h"
  11
  12 namespace ui {
  13
  14 class UI_BASE_EXPORT ListModelObserver {
  15  public:
  16   // Invoked after items has been added to the model.
  17   virtual void ListItemsAdded(size_t start, size_t count) = 0;
  18
  19   // Invoked after items has been removed. |start| is the index before the
  20   // removal.
  21   virtual void ListItemsRemoved(size_t start, size_t count) = 0;
  22
  23   // Invoked after an item has been moved. See ListModel::Move() for details
  24   // of the arguments.
  25   virtual void ListItemMoved(size_t index, size_t target_index) = 0;
  26
  27   // Invoked after items has been changed.
  28   virtual void ListItemsChanged(size_t start, size_t count) = 0;
  29
  30  protected:
  31   virtual ~ListModelObserver() {}
  32 };
  33
  34 }  // namespace ui
  35
  36 #endif  // UI_BASE_MODELS_LIST_MODEL_OBSERVER_H_