chromium/ui/base/models/list_selection_model.h

// 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_LIST_SELECTION_MODEL_H_
#define UI_BASE_MODELS_LIST_SELECTION_MODEL_H_

#include <stddef.h>

#include <optional>

#include "base/component_export.h"
#include "base/containers/flat_set.h"

namespace ui {

// Selection model represented as a list of indexes. In addition to the set of
// selected indices ListSelectionModel maintains the following:
//
// active: The index of the currently visible item in the list. This will be
//         nullopt if nothing is selected.
//
// anchor: The index of the last item the user clicked on. Extending the
//         selection extends it from this index. This will be nullopt if nothing
//         is selected.
//
// Typically there is only one selected item, in which case the anchor and
// active index correspond to the same thing.
class COMPONENT_EXPORT(UI_BASE) ListSelectionModel { … };

}  // namespace ui

#endif  // UI_BASE_MODELS_LIST_SELECTION_MODEL_H_