title: How to fetch the middle mouse button in java?
body: <p>I use <code>public boolean mouseDown(Event ev, int x, int y)</code> to detect a click of the mouse.<br>
  I can distinguish between the right mouse button (ev.metaDown() is true) and the left and middle.</p>
  
  <p>How can i differentiate the left from the middle button?
  Or if it is impossible with mouseDown, what should i use?</p>