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// Copyright (c) 2012 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 UI_BASE_MODELS_LIST_MODEL_OBSERVER_H_
#define UI_BASE_MODELS_LIST_MODEL_OBSERVER_H_
#include <stddef.h>
#include "ui/base/ui_export.h"
namespace ui {
class UI_EXPORT ListModelObserver {
public:
// Invoked after items has been added to the model.
virtual void ListItemsAdded(size_t start, size_t count) = 0;
// Invoked after items has been removed. |start| is the index before the
// removal.
virtual void ListItemsRemoved(size_t start, size_t count) = 0;
// Invoked after an item has been moved. See ListModel::Move() for details
// of the arguments.
virtual void ListItemMoved(size_t index, size_t target_index) = 0;
// Invoked after items has been changed.
virtual void ListItemsChanged(size_t start, size_t count) = 0;
protected:
virtual ~ListModelObserver() {}
};
} // namespace ui
#endif // UI_BASE_MODELS_LIST_MODEL_OBSERVER_H_
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