gui_input_handler_func.h

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#pragma once
 
#include <gui_core/gui_id.h>
#include <gui_core/gui_base_types.h>     // int2
#include <gui_core/input/gui_input_enums.h>
#include <functional>
 
namespace tachyon
{
 
    struct ElementRect;    // gui_core/elements/gui_element.h
    struct ElementRef;     // gui_core/elements/gui_element.h
    class  ElementStorage; // gui_core/elements/gui_element_storage.h
    struct InputState;     // gui_core/input/gui_input_state.h

    struct ElementEvent
    {
        tachyon::ID             id;          
        EventType           type;
        const InputState&   state;       
        const ElementRect*  rect;        
        const ElementRef&   elementRef;

        int2 LocalCursor(const ElementStorage& storage) const;
    };

    using EventHandler = std::function<bool(ElementEvent&& input)>;

    inline EventHandler Chain(EventHandler first, EventHandler second)
    {
        return [f = std::move(first), s = std::move(second)](ElementEvent&& event) -> bool
        {
            if (f && f(ElementEvent{ event })) return true;
            if (s && s(std::move(event))) return true;
            return false;
        };
    }

}