imgui_helpers.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
 *                                                                           *
 * All rights reserved.                                                      *
 *                                                                           *
 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla Foundation; either version 2 of the License, or            *
 * (at your option) any later version.                                       *
 *                                                                           *
 * This program is distributed in the hope that it will be useful,           *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_IMGUI_IMGUI_HELPERS_H
#define VCL_IMGUI_IMGUI_HELPERS_H
 
#include <functional>
#include <imgui.h>
 
#include <vclib/space/core/color.h>
 
namespace ImGui {
 
inline bool Checkbox(
    const char*               label,
    std::function<bool()>     get,
    std::function<void(bool)> set)
{
    bool       value = get();
    const bool ret   = ImGui::Checkbox(label, &value);
    set(value);
    return ret;
}
 
inline bool RadioButton(
    const char*               label,
    std::function<bool()>     get,
    std::function<void(bool)> set)
{
    bool       value = get();
    const bool ret   = ImGui::RadioButton(label, value);
    if (ret) {
        set(true);
    }
    return ret;
}
 
inline bool SliderFloat(
    const char*                label,
    std::function<float()>     get,
    std::function<void(float)> set,
    float                      vMin,
    float                      vMax)
{
    float      value = get();
    const bool ret   = ImGui::SliderFloat(label, &value, vMin, vMax);
    if (ret) {
        set(value);
    }
    return ret;
}
 
inline bool ColorEdit4(
    const char*                     label,
    std::function<vcl::Color()>     get,
    std::function<void(vcl::Color)> set,
    ImGuiColorEditFlags             flags)
{
    // TODO: use float based color
    vcl::Color c        = get();
    float      color[4] = {c.redF(), c.greenF(), c.blueF(), c.alphaF()};
    const bool ret      = ImGui::ColorEdit4(label, color, flags);
    if (ret) {
        c.setRgbF(color[0], color[1], color[2], color[3]);
        set(c);
    }
    return ret;
}
 
} // namespace ImGui
 
#endif // VCL_IMGUI_IMGUI_HELPERS_H