gui_gradient_editor_subsystem.h

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

    struct GradientEditorState
    {
        tachyon::ID       triggerID = tachyon::ID::Invalid(); 
        tachyon::ID       windowID  = tachyon::ID::Invalid(); 
        tachyon::Gradient workingCopy {};                  
        int           selectedStop          = 0;       
        tachyon::color4f  selectedStopColor {};            
        float         selectedStopPosition  = 0.0f;    
 
        tachyon::Gradient originalGradient {};             
        std::string          context;                         

        enum class CloseRequest { None, Ok, Cancel } closeRequest = CloseRequest::None;
        std::vector<tachyon::Gradient> savedPresets;       
 
        tachyon::PointerDrag press;                     
        int           dragStopIndex          = -1;      
        float         dragGrab               = 0.0f;    
        bool          dragOff                = false;   
        tachyon::Gradient beforeDrag {};                
        int           selectedBeforeDrag     = 0;
 
        tachyon::VisualColorStyleIndex previewGradientStyle = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex stopEdgeColor        = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex stopOutlineColor     = tachyon::VisualColorStyleIndex::Invalid;
        tachyon::VisualColorStyleIndex stopHaloColor        = tachyon::VisualColorStyleIndex::Invalid;
    };

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

        GradientEditorState& State() { return m_state; }

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

        void KeepSwatchAlive(tachyon::ID swatchID);

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

}