XCEngine/editor/src/UI/VectorControls.h

#pragma once

#include "Core.h"
#include <imgui.h>
#include <XCEngine/Core/Math/Vector3.h>
#include <XCEngine/Core/Math/Vector2.h>
#include <string>

namespace XCEngine {
namespace Editor {
namespace UI {

struct AxisFloatControlSpec {
    const char* label = nullptr;
    float* value = nullptr;
};

inline bool DrawAxisFloatControls(
    const AxisFloatControlSpec* axes,
    int axisCount,
    float dragSpeed,
    bool useResetButtons,
    float resetValue,
    bool* isActive = nullptr
) {
    bool changed = false;
    bool anyItemActive = false;

    ImGui::PushStyleVar(
        ImGuiStyleVar_ItemSpacing,
        useResetButtons ? VectorAxisControlSpacing() : VectorAxisInputSpacing());

    const float availableWidth = ImGui::GetContentRegionAvail().x;
    const float spacing = ImGui::GetStyle().ItemSpacing.x;

    if (useResetButtons) {
        const float lineHeight = ImGui::GetFontSize() + ImGui::GetStyle().FramePadding.y * 2.0f;
        const ImVec2 buttonSize(lineHeight + VectorAxisResetButtonExtraWidth(), lineHeight);
        float itemWidth = (availableWidth - buttonSize.x * static_cast<float>(axisCount)) / static_cast<float>(axisCount);
        if (itemWidth < 0.0f) {
            itemWidth = 0.0f;
        }

        const ImVec4 buttonColor = VectorAxisButtonColor();
        const ImVec4 buttonHoverColor = VectorAxisButtonHoveredColor();

        for (int i = 0; i < axisCount; ++i) {
            ImGui::PushStyleColor(ImGuiCol_Button, buttonColor);
            ImGui::PushStyleColor(ImGuiCol_ButtonHovered, buttonHoverColor);
            ImGui::PushStyleColor(ImGuiCol_ButtonActive, buttonColor);

            if (ImGui::Button(axes[i].label, buttonSize)) {
                *axes[i].value = resetValue;
                changed = true;
            }
            ImGui::PopStyleColor(3);

            ImGui::SameLine();
            ImGui::SetNextItemWidth(itemWidth);
            if (ImGui::DragFloat((std::string("##") + axes[i].label).c_str(), axes[i].value, dragSpeed, 0.0f, 0.0f, "%.2f")) {
                changed = true;
            }

            anyItemActive = anyItemActive || ImGui::IsItemActive();
            if (i + 1 < axisCount) {
                ImGui::SameLine();
            }
        }
    } else {
        const float axisLabelWidth = ImGui::CalcTextSize("Z").x;
        float itemWidth = (availableWidth - axisLabelWidth * static_cast<float>(axisCount) - spacing * static_cast<float>(axisCount * 2 - 1)) / static_cast<float>(axisCount);
        if (itemWidth < 0.0f) {
            itemWidth = 0.0f;
        }

        for (int i = 0; i < axisCount; ++i) {
            ImGui::AlignTextToFramePadding();
            ImGui::TextDisabled("%s", axes[i].label);
            ImGui::SameLine();
            ImGui::SetNextItemWidth(itemWidth);
            if (ImGui::DragFloat((std::string("##") + axes[i].label).c_str(), axes[i].value, dragSpeed, 0.0f, 0.0f, "%.2f")) {
                changed = true;
            }

            anyItemActive = anyItemActive || ImGui::IsItemActive();
            if (i + 1 < axisCount) {
                ImGui::SameLine();
            }
        }
    }

    ImGui::PopStyleVar();

    if (isActive) {
        *isActive = anyItemActive;
    }

    return changed;
}

inline bool DrawVec3Input(
    const char* label,
    ::XCEngine::Math::Vector3& values,
    float columnWidth = DefaultControlLabelWidth(),
    float dragSpeed = 0.1f,
    bool* isActive = nullptr
) {
    const AxisFloatControlSpec axes[] = {
        { "X", &values.x },
        { "Y", &values.y },
        { "Z", &values.z }
    };

    return DrawControlRow(label, columnWidth, [&]() {
        return DrawAxisFloatControls(axes, 3, dragSpeed, false, 0.0f, isActive);
    });
}

inline bool DrawVec3(
    const char* label,
    ::XCEngine::Math::Vector3& values,
    float resetValue = 0.0f,
    float columnWidth = DefaultControlLabelWidth(),
    float dragSpeed = 0.1f,
    bool* isActive = nullptr
) {
    const AxisFloatControlSpec axes[] = {
        { "X", &values.x },
        { "Y", &values.y },
        { "Z", &values.z }
    };

    return DrawControlRow(label, columnWidth, [&]() {
        return DrawAxisFloatControls(axes, 3, dragSpeed, true, resetValue, isActive);
    });
}

inline bool DrawVec2(
    const char* label,
    ::XCEngine::Math::Vector2& values,
    float resetValue = 0.0f,
    float columnWidth = DefaultControlLabelWidth(),
    float dragSpeed = 0.1f
) {
    const AxisFloatControlSpec axes[] = {
        { "X", &values.x },
        { "Y", &values.y }
    };

    return DrawControlRow(label, columnWidth, [&]() {
        return DrawAxisFloatControls(axes, 2, dragSpeed, true, resetValue);
    });
}

}
}
}