Question

I use public boolean mouseDown(Event ev, int x, int y) to detect a click of the mouse.
I can distinguish between the right mouse button (ev.metaDown() is true) and the left and middle.

How can i differentiate the left from the middle button? Or if it is impossible with mouseDown, what should i use?

Answer 1

Try using ALT_MASK:

This flag indicates that the Alt key was down when the event occurred. For mouse events, this flag indicates that the middle mouse button was pressed or released.

So your code might be:

if (ev.modifiers & Event.ALT_MASK != 0) {     // middle button was pressed } 

Of course, all this is assuming you have a very good reason to use mouseDown in the first place, since it is deprecated. You should (probably) be using processMouseEvent instead, which gives you a MouseEvent to play with.