app/table_model_observer.h


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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef APP_TABLE_MODEL_OBSERVER_H_
#define APP_TABLE_MODEL_OBSERVER_H_

// Observer for a TableModel. Anytime the model changes, it must notify its
// observer.
class TableModelObserver {
 public:
  // Invoked when the model has been completely changed.
  virtual void OnModelChanged() = 0;

  // Invoked when a range of items has changed.
  virtual void OnItemsChanged(int start, int length) = 0;

  // Invoked when new items are added.
  virtual void OnItemsAdded(int start, int length) = 0;

  // Invoked when a range of items has been removed.
  virtual void OnItemsRemoved(int start, int length) = 0;

 protected:
  virtual ~TableModelObserver() {}
};

#endif  // APP_TABLE_MODEL_OBSERVER_H_