title: Check mouse wheel state SFML
body: <p>In my program I wish to be able to know if the mouse wheel has been scrolled, and if so how much in what direction. Is this possible with C++ and SFML?</p>
  
  <p>So far I have this:</p>
  
  <pre><code>if (sf::Event::MouseWheelEvent().delta != 0)
  {
      SimulationView.zoom(1 + (10 / sf::Event::MouseWheelEvent().delta));
  }
  </code></pre>
  
  <p>But the second line never exicutes, even when I scroll the mouse wheel</p>