[SFML 2.X] Tworzenie okienek w SFML

#pragma once
#include "ElementGUI/ElementGUI.hpp"
#include "ElementGUI/Button.hpp"

enum class DialogState { Idle, ToClose };

class Dialog
    : public ElementGUI
{
public:
    sf::Vector2f _position;
    sf::RectangleShape _dialog_rect;
    sf::RectangleShape _title_rect;
    sf::Text _title_text;
    sf::RectangleShape _content_rect;
    NormalButton * _close_btn;
   
    DialogState _state;
   
    bool _is_moved;
    sf::Vector2f _offset;
   
    Dialog( std::wstring title, sf::Vector2f size, sf::Vector2f position = sf::Vector2f( - 1, - 1 ) );
    virtual ~Dialog();
   
    sf::Vector2f getPosition();
    void setSize( sf::Vector2f size );
    sf::Vector2f getSize();
    virtual void setPosition( sf::Vector2f position );
   
    virtual void cursorHover();
    virtual void handleEvent( sf::Event & event );
    virtual void update();
    virtual void draw();
};

extern std::vector < Dialog * > dialogs;