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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.
#include "base/strings/string16.h"
#include "ui/base/ui_base_export.h"
namespace ui {
class ComboboxModelObserver;
// A data model for a combo box.
class UI_BASE_EXPORT ComboboxModel {
virtual ~ComboboxModel() {}
// Returns the number of items in the combo box.
virtual int GetItemCount() const = 0;
// Returns the string at the specified index.
virtual base::string16 GetItemAt(int index) = 0;
// Should return true if the item at |index| is a non-selectable separator
// item.
virtual bool IsItemSeparatorAt(int index);
// The index of the item that is selected by default (before user
// interaction).
virtual int GetDefaultIndex() const;
// Returns true if the item at |index| is enabled.
virtual bool IsItemEnabledAt(int index) const;
// Adds/removes an observer. Override if model supports mutation.
virtual void AddObserver(ComboboxModelObserver* observer) {}
virtual void RemoveObserver(ComboboxModelObserver* observer) {}
} // namespace ui