bwidgets/inc/basic_widgets/abstract/widget.hpp

#ifndef WIDGET_HPP
#define WIDGET_HPP

#include <functional>

#include <SDL2/SDL.h>

class Widget
{
protected:
    bool _focused = false;
    bool _hovered = false;
    bool _pushed = false;
    SDL_Renderer* _renderer;
    SDL_Rect _viewport {0, 0, 0, 0};
    SDL_Rect _widget_area {0, 0, 0, 0};

    virtual void _on_focus();
    virtual void _on_focus_loss();
    virtual void _on_key(const SDL_KeyboardEvent&);
    virtual void _on_push(const SDL_MouseButtonEvent&);
    virtual void _on_release(const SDL_MouseButtonEvent&);
    virtual void _on_text_input(const SDL_TextInputEvent&);
    virtual void _update_hover_state(const SDL_MouseMotionEvent&);
    virtual void _update_widget_area();

public:
    std::function<void (const SDL_MouseButtonEvent&)> click_handler = NULL;

    Widget(SDL_Renderer*);
    virtual ~Widget();
    static inline int center(int available_size, int used_size)
    {
        return (available_size - used_size) / 2;
    }
    virtual void handle_event(const SDL_Event&);
    virtual int height() const;
    virtual void render();
    virtual void viewport(SDL_Rect);
    virtual int width() const;
};

#endif