bwidgets/inc/basic_widgets/w/feat/focus_handler.hpp

#ifndef BWIDGETS_FOCUS_HANDLER_HPP
#define BWIDGETS_FOCUS_HANDLER_HPP

struct SDL_Rect;

namespace bwidgets
{
    class FocusHandler
    {
    protected:
        const SDL_Rect* _focus_area = nullptr;
        bool            _has_focus  = false;

        virtual void _handle_focus_change(bool) = 0;

    public:
        FocusHandler()                    = default;
        FocusHandler(const FocusHandler&) = delete;
        FocusHandler(FocusHandler&&)      = delete;
        virtual ~FocusHandler()           = default;

        auto operator=(FocusHandler&&) -> FocusHandler& = delete;
        auto operator=(const FocusHandler&) -> FocusHandler& = delete;

        virtual inline void focus(bool focus) final
        {
            _handle_focus_change(focus);
            _has_focus = focus;
        }
    };
}

#endif