GradientColorPicker.h

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// Copyright (c) 2025 Dave R. Smith.
// Malena Framework — Licensed under PolyForm Noncommercial 1.0.0; commercial use requires a paid license. See LICENSE.
 
#ifndef MALENA_GRADIENTCOLORPICKER_H
#define MALENA_GRADIENTCOLORPICKER_H
 
#pragma once
 
#include <Malena/Core/malena_export.h>
#include <Malena/Graphics/Base/Graphic.h>
#include <SFML/Graphics/RectangleShape.hpp>
#include <functional>
 
namespace ml
{
    class MALENA_API GradientColorPicker : public Graphic<sf::RectangleShape>
    {
    public:
        GradientColorPicker();

        void setColor(const sf::Color& c);
        [[nodiscard]] sf::Color color() const;

        void onColorChanged(std::function<void(const sf::Color&)> cb);
        void onCommit(std::function<void()> cb);
 
        void setSize(const sf::Vector2f& size);
        [[nodiscard]] sf::Vector2f getSize() const;
 
        void setPosition(const sf::Vector2f& pos) override;
        [[nodiscard]] sf::Vector2f  getPosition()     const override;
        [[nodiscard]] sf::FloatRect getGlobalBounds() const override;
 
        void draw(sf::RenderTarget& target, sf::RenderStates states) const override;
 
        // HSV<->RGB helpers (h in [0,360), s/v in [0,1]).
        static sf::Color hsvToRgb(float h, float s, float v);
        static void      rgbToHsv(const sf::Color& c, float& h, float& s, float& v);
 
    private:
        [[nodiscard]] sf::FloatRect svRect()  const;
        [[nodiscard]] sf::FloatRect hueRect() const;
        void emitChange();
 
        sf::Vector2f _pos  { 0.f, 0.f };
        sf::Vector2f _size { 240.f, 200.f };
        float        _hueBarW = 22.f;
        float        _gap     = 10.f;
 
        float _h = 0.f, _s = 1.f, _v = 1.f;
 
        int  _drag          = 0;   // 0 none, 1 SV square, 2 hue bar
        bool _prevMouseDown = false;
        bool _prevEnter     = false;
 
        std::function<void(const sf::Color&)> _onColorChanged;
        std::function<void()>                 _onCommit;
    };
 
} // namespace ml
 
#endif // MALENA_GRADIENTCOLORPICKER_H