bwidgets/inc/basic_widgets/abstract/widget.hpp

#ifndef WIDGET_HPP
#define WIDGET_HPP

#include <SDL2/SDL_events.h>
#include <SDL2/SDL_rect.h>

#include <basic_widgets/sdl/data_type.hpp>
#include <basic_widgets/sdl/renderer.hpp>

struct SDL_Renderer;

namespace bwidgets::abstract
{
    class Widget
    {
        protected:
            sdl::Renderer* _renderer    {nullptr};
            SDL_Rect       _viewport    {0, 0, 0, 0};
            SDL_Rect       _widget_area {0, 0, 0, 0};

            virtual void _handle_geometry_change(const SDL_Rect&) noexcept = 0;
            virtual void _handle_renderer_change(sdl::Renderer*) {}
            virtual void _handle_rendering() = 0;

        public:
            Widget* parent;

            Widget(Widget* p=nullptr) : parent(p) {}

            //*********************************************
            //
            virtual     ~Widget() noexcept = default;
            virtual void handle_event(const SDL_Event&);
            // -----
            inline virtual sdl::Size size() const noexcept
            {
                return {_widget_area.w, _widget_area.h};
            }
            //
            //*********************************************

            virtual void render() final;
            // -----
            virtual inline void renderer(sdl::Renderer* r) final
            {
                _handle_renderer_change(r);
                _renderer = r;
            }
            virtual inline void viewport(const SDL_Rect& vp) noexcept final
            {
                _handle_geometry_change(vp);
                _viewport = vp;
            }
    };
}

#endif