Combobox.h

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// The MIT License (MIT)
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#pragma once

#include <functional>

#include "open3d/visualization/gui/Widget.h"

namespace open3d {
namespace visualization {
namespace gui {

class Combobox : public Widget {
public:
    Combobox();
    explicit Combobox(const std::vector<const char*>& items);
    ~Combobox() override;

    void ClearItems();
    int AddItem(const char* name);

    void ChangeItem(int index, const char* name);
    void ChangeItem(const char* orig_name, const char* new_name);

    void RemoveItem(const char* name);
    void RemoveItem(int index);

    int GetNumberOfItems() const;

    const char* GetItem(int index) const;

    int GetSelectedIndex() const;
    const char* GetSelectedValue() const;
    void SetSelectedIndex(int index);
    bool SetSelectedValue(const char* value);

    Size CalcPreferredSize(const Theme& theme) const override;

    DrawResult Draw(const DrawContext& context) override;

    void SetOnValueChanged(
            std::function<void(const char*, int)> on_value_changed);

private:
    struct Impl;
    std::unique_ptr<Impl> impl_;
};

}  // namespace gui
}  // namespace visualization
}  // namespace open3d