ColorPicker.h

Go to the documentation of this file.

// 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_COLORPICKER_H
#define MALENA_COLORPICKER_H
 
#pragma once
 
#include <Malena/Core/malena_export.h>
#include <Malena/Graphics/Base/Graphic.h>
#include <SFML/Graphics/RectangleShape.hpp>
#include <functional>
#include <vector>
 
namespace ml
{
    class MALENA_API ColorPicker : public Graphic<sf::RectangleShape>
    {
    public:
        ColorPicker();

        void setPalette(const std::vector<sf::Color>& colors);
        [[nodiscard]] const std::vector<sf::Color>& palette() const { return _palette; }

        void addColor(const sf::Color& c);
        void removeColor(std::size_t index);

        void setMaxColors(int max);

        void onColorRemoved(std::function<void(const sf::Color&)> cb);

        void onSwatchRightClick(std::function<void(std::size_t, const sf::Vector2f&)> cb);
 
        void setColumns(int columns);
        void setSwatchSize(float px);
        void setSwatchGap(float px);

        void onColorSelected(std::function<void(const sf::Color&)> cb);
 
        // ── Positionable / size (auto-sized to the grid) ──────────────────────
        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;
 
    private:
        sf::FloatRect cellRect(std::size_t index) const;
        void          recomputeSize();
 
        std::vector<sf::Color> _palette;
        int _maxColors = 0;   // 0 = unlimited
        std::function<void(const sf::Color&)> _onColorSelected;
        std::function<void(const sf::Color&)> _onColorRemoved;
        std::function<void(std::size_t, const sf::Vector2f&)> _onSwatchRightClick;
 
        sf::Vector2f _pos     { 0.f, 0.f };
        float        _swatch  = 22.f;
        float        _gap     = 4.f;
        float        _pad     = 6.f;
        int          _cols    = 8;
 
        bool         _prevMouseDown  = false;
        bool         _prevRightDown  = false;
        mutable int  _hoverIndex     = -1;
    };
 
} // namespace ml
 
#endif // MALENA_COLORPICKER_H