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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_MODELS_COMBOBOX_MODEL_H_
#define UI_BASE_MODELS_COMBOBOX_MODEL_H_
#include <string>
#include "base/component_export.h"
#include "base/observer_list.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace ui {
class ComboboxModelObserver;
class ImageModel;
// A data model for a combo box.
class COMPONENT_EXPORT(UI_BASE) ComboboxModel {
public:
ComboboxModel();
virtual ~ComboboxModel();
// Returns the number of items in the combo box.
virtual size_t GetItemCount() const = 0;
// Returns the string at the specified index.
virtual std::u16string GetItemAt(size_t index) const = 0;
// Returns the string to be shown in the dropdown for the item at |index|. By
// default, it returns GetItemAt(index).
virtual std::u16string GetDropDownTextAt(size_t index) const;
// Returns the secondary string at the specified index. Secondary strings are
// displayed in a second line inside every menu item.
virtual std::u16string GetDropDownSecondaryTextAt(size_t index) const;
// Gets the icon for the item at the specified index. ImageModel is empty if
// there is no icon.
virtual ImageModel GetIconAt(size_t index) const;
// Gets the icon for the item at |index|. ImageModel is empty if there is no
// icon. By default, it returns GetIconAt(index).
virtual ImageModel GetDropDownIconAt(size_t index) const;
// Should return true if the item at |index| is a non-selectable separator
// item.
virtual bool IsItemSeparatorAt(size_t index) const;
// The index of the item that is selected by default (before user
// interaction).
virtual absl::optional<size_t> GetDefaultIndex() const;
// Returns true if the item at |index| is enabled.
virtual bool IsItemEnabledAt(size_t index) const;
// Adds/removes an observer.
void AddObserver(ComboboxModelObserver* observer);
void RemoveObserver(ComboboxModelObserver* observer);
protected:
base::ObserverList<ui::ComboboxModelObserver>& observers() {
return observers_;
}
private:
base::ObserverList<ui::ComboboxModelObserver> observers_;
};
} // namespace ui
#endif // UI_BASE_MODELS_COMBOBOX_MODEL_H_
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