gui_label_group_subsystem.h

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#pragma once
 
#include <unordered_map>
#include <vector>
 
#include <gui_core/gui_id.h>
#include <gui_core/elements/gui_element.h>
#include <gui_core/text/gui_text_system.h>
 
namespace tachyon
{
 
    class FramePipeline;
    struct FrameContext;
    class ElementStorage;
    class GUIStateManager;
    class GUITheme;

    class LabelGroupSubsystem
    {
    public:
        struct State
        {
            int32_t labelWidth = 120;   
            int32_t minWidth   = 40;    
            int32_t maxWidth   = 500;   
            bool    resizable  = true;  
            bool    edgeHovered     = false;   
            bool    edgeDragging    = false;   
            bool    anyLabelHovered = false; 
            std::vector<tachyon::TextID> labelTextIDs; 
            int32_t maxLabelWidthThisFrame = 0;    
            std::vector<tachyon::ElementRef> labelRefs; 
        };
 
        LabelGroupSubsystem(FramePipeline& frame,
                            ElementStorage& elementStorage,
                            GUIStateManager& guiStateManager,
                            GUITheme& theme);

        void   BeginGroup(tachyon::ID id, int32_t defaultWidth, int32_t minWidth, int32_t maxWidth, bool resizable = true);
        void   EndGroup();
        State* GetActiveGroup();
        void   AddDragger(tachyon::ElementRef labelRef);

        bool IsBalanced() const { return m_stack.empty(); }
 
    private:
        void OnPreConstruct();
        void OnPostConstruct();
        void OnEndFrame();
 
        struct StackEntry {
            State*   state;
            uint32_t nestingDepth;
        };
 
        std::unordered_map<tachyon::ID, State> m_states;
        std::vector<StackEntry>            m_stack;
 
        ElementStorage&  m_elementStorage;
        GUIStateManager& m_guiStateManager;
        GUITheme&        m_theme;
    };

}