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// Copyright 2013 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.
#include "ash/public/cpp/ash_public_export.h"
#include "ash/public/cpp/shelf_types.h"
namespace ash {
struct ShelfItem;
class ShelfItemDelegate;
// An observer interface for shelf item and delegate changes in ShelfModel.
class ASH_PUBLIC_EXPORT ShelfModelObserver {
// Invoked after an item has been added to the model.
virtual void ShelfItemAdded(int index) {}
// Invoked after an item has been removed from the model. |index| is the index
// the item was at before removal, |old_item| is the item before removal.
virtual void ShelfItemRemoved(int index, const ShelfItem& old_item) {}
// Invoked after an item has been moved. See ShelfModel::Move() for details
// of the arguments.
virtual void ShelfItemMoved(int start_index, int target_index) {}
// Invoked after an item changes. |old_item| is the item before the change.
virtual void ShelfItemChanged(int index, const ShelfItem& old_item) {}
// Invoked after a delegate changes, but before the old one is destroyed.
// |delegate| is the new value and |old_delegate| is the previous value.
virtual void ShelfItemDelegateChanged(const ShelfID& id,
ShelfItemDelegate* old_delegate,
ShelfItemDelegate* delegate) {}
// Invoked when the status of the item corresponding to |id| changes. Only
// observers within ash (typically the shelf views) need to respond to this
// event.
virtual void ShelfItemStatusChanged(const ShelfID& id) {}
virtual ~ShelfModelObserver() {}
} // namespace ash