gui_color_picker_subsystem.h

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#pragma once
 
#include <optional>
#include <string>
#include <unordered_map>
#include <vector>
 
#include <gui_core/gui_id.h>
#include <gui_core/input/gui_pointer_drag.h>
#include <gui_core/style/gui_style.h>
#include <gui_core/style/gui_color_conversions.h>
 
namespace tachyon
{
 
    class FramePipeline;
    struct FrameContext;

    struct ColorPickerState
    {
        tachyon::ID triggerID = tachyon::ID::Invalid(); 
        tachyon::ID windowID  = tachyon::ID::Invalid(); 
        float h = 0, s = 0, v = 0, a = 1;       
        tachyon::color4f originalColor {};           
        bool  allowHDR      = false;                 
        float hdrBrightness = 1.0f;                  
        std::string hexText;                     
 
        tachyon::ColorSpace activeSpace = tachyon::ColorSpace::HSV;

        float comp[3]     = { 0, 0, 0 };
        float snapComp[3] = { 0, 0, 0 };
        bool  slidersInitialized = false;

        bool byteRange = true;
        bool picking   = false;
        std::optional<bool> canPick;     
        std::string context;   

        enum class CloseRequest { None, Ok, Cancel } closeRequest = CloseRequest::None;
        std::vector<tachyon::color4f> recent;   
 
        tachyon::VisualColorStyleIndex svQuadColor   = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex hueStrip      = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex alphaStrip    = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex hueColor      = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex whiteColor    = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex outlineColor  = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex newColor      = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex originalStyle = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex newOpaque      = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex originalOpaque = tachyon::VisualColorStyleIndex::Invalid;

        enum class DragTarget { None, Square, Hue, Alpha };
        tachyon::PointerDrag press;
        float startH = 0.0f, startS = 0.0f, startV = 0.0f, startA = 1.0f;
 
        static constexpr int kNumGradientSliders = 4;
        tachyon::VisualColorStyleIndex gradientStyles[kNumGradientSliders] = {};
 
        struct PaletteSwatch { tachyon::color4f color {}; };
        std::vector<PaletteSwatch> palette = {
            {{ 0.8f, 0.8f, 0.8f, 1.0f }},
            {{ 0.0f, 0.8f, 0.8f, 1.0f }},
            {{ 0.8f, 0.0f, 0.8f, 1.0f }},
            {{ 0.8f, 0.8f, 0.0f, 1.0f }},
        };
    };

    class ColorPickerSubsystem
    {
    public:
        explicit ColorPickerSubsystem(FramePipeline& frame);

        ColorPickerState& State() { return m_state; }

        tachyon::VisualColorStyleIndex& ClaimSwatchStyle(tachyon::ID swatchID);

        void KeepSwatchAlive(tachyon::ID swatchID);

        void ForgetStyles();
 
    private:
        ColorPickerState m_state{};
        std::unordered_map<tachyon::ID, tachyon::VisualColorStyleIndex> m_swatchStyles, m_prevSwatchStyles;
    };

}