EnumCombo.hpp

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// This file is part of INSTINCT, the INS Toolkit for Integrated
// Navigation Concepts and Training by the Institute of Navigation of
// the University of Stuttgart, Germany.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
 
#pragma once
 
#include <imgui.h>
#include <fmt/core.h>
 
namespace NAV::gui::widgets
{
 
template<typename T>
bool EnumCombo(const char* label, T& enumeration, size_t startIdx = 0)
{
    bool clicked = false;
    if (ImGui::BeginCombo(label, NAV::to_string(enumeration)))
    {
        for (size_t i = startIdx; i < static_cast<size_t>(T::COUNT); i++)
        {
            const bool is_selected = (static_cast<size_t>(enumeration) == i);
            if (ImGui::Selectable(NAV::to_string(static_cast<T>(i)), is_selected))
            {
                enumeration = static_cast<T>(i);
                clicked = true;
            }
 
            // Set the initial focus when opening the combo (scrolling + keyboard navigation focus)
            if (is_selected)
            {
                ImGui::SetItemDefaultFocus();
            }
        }
 
        ImGui::EndCombo();
    }
    return clicked;
}
 
template<typename T>
bool EnumCombo(const char* label, T& enumeration1, T& enumeration2, const char* previewAppendix = "")
{
    bool clicked = false;
    std::string previewText = enumeration1 == enumeration2
                                  ? fmt::format("{}{}", NAV::to_string(enumeration1), previewAppendix)
                                  : fmt::format("{} | {}{}", NAV::to_string(enumeration1), NAV::to_string(enumeration2), previewAppendix);
    if (ImGui::BeginCombo(label, previewText.c_str()))
    {
        for (size_t i = 0; i < static_cast<size_t>(T::COUNT); i++)
        {
            const bool is_selected = (static_cast<size_t>(enumeration1) == i);
            if (ImGui::Selectable(NAV::to_string(static_cast<T>(i)), is_selected))
            {
                enumeration1 = static_cast<T>(i);
                enumeration2 = static_cast<T>(i);
                clicked = true;
            }
 
            // Set the initial focus when opening the combo (scrolling + keyboard navigation focus)
            if (is_selected)
            {
                ImGui::SetItemDefaultFocus();
            }
        }
 
        ImGui::EndCombo();
    }
    return clicked;
}
 
} // namespace NAV::gui::widgets