gui_button_group_subsystem.h

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#pragma once
 
#include <cstdint>
#include <vector>
 
#include <gui_core/elements/gui_element.h>
#include <gui_core/style/gui_style_ref.h>
 
namespace tachyon
{
 
    class ElementStorage;
    class StyleManager;
    class FramePipeline;
    struct FrameContext;

    class ButtonGroupSubsystem
    {
    public:
        struct ItemState
        {
            tachyon::StyleRef itemStyleRef{};
            tachyon::StyleRef soloStyleRef{};
            int32_t       itemCount = 0;
            tachyon::ElementRef firstRef = tachyon::ElementRef::Invalid();
        };
 
        ButtonGroupSubsystem(FramePipeline& frame, ElementStorage& elementStorage, StyleManager& styleManager);

        void BeginButtonGroup(ItemState state);
        void EndButtonGroup();
        void BeginToggleGroup(ItemState state);
        void EndToggleGroup();

        ItemState* GetActiveButton();
        ItemState* GetActiveToggle();

        tachyon::StyleRef NextItemStyleRef(ItemState& state);

        bool IsBalanced() const { return m_buttonStack.empty() && m_toggleStack.empty(); }
 
    private:
        void OnEndFrame();
 
        struct StackEntry { ItemState state; uint32_t nestingDepth; };
 
        std::vector<StackEntry> m_buttonStack;
        std::vector<StackEntry> m_toggleStack;
        ElementStorage&         m_elementStorage;
        StyleManager&           m_styleManager;
    };

}