title: How to make an auto-scrolling textbox in Qt?
body: <p>In one of my projects, I would like to have an auto-scrolling textbox.</p>
  
  <p>I'm not talking of a textbox that scrolls whenever someone adds a text line, but of something which is like a movie <a href="http://en.wikipedia.org/wiki/Closing_credits" rel="nofollow noreferrer">"closing credits"</a> sequence.</p>
  
  <p>The textbox would be fullfiled with text and down-scroll slowly without any user action.</p>
  
  <p>Is there any existing widget that would fit this purpose ? If not, what would be the best way to achieve that ?</p>