制作sfml c++滚动条不会在视图内绘制形状

#include <SFML/Graphics.hpp>

int main()
{
    sf::RenderWindow window(sf::VideoMode(800, 600), "Scrollbar Example");

    sf::View view(sf::FloatRect(0, 0, 800, 600));
    window.setView(view);

    sf::RectangleShape shape(sf::Vector2f(100, 100));
    shape.setFillColor(sf::Color::Red);

    sf::Scrollbar scrollbar(sf::Vector2f(10, 10), sf::Vector2f(20, 200));
    scrollbar.setFillColor(sf::Color::White);
    scrollbar.setOutlineColor(sf::Color::Black);
    scrollbar.setOutlineThickness(1.f);

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
        }

        // 更新滚动条位置和大小
        scrollbar.setPosition(sf::Vector2f(view.getCenter().x - view.getSize().x / 2 + 10, view.getCenter().y - view.getSize().y / 2 + 10));
        scrollbar.setSize(sf::Vector2f(20, view.getSize().y - 20));

        // 更新滚动条的视图大小和滑块大小
        scrollbar.setView(view);
        scrollbar.setSliderSize(view.getSize().y / 10);

        // 绘制形状
        window.clear();
        window.draw(shape);

        // 绘制滚动条
        window.draw(scrollbar);

        window.display();
    }

    return 0;
}