Question

Is it possible to convert a Unit to a method of an anonymous class?

Instead of:

addSelectionListener(new SelectionListener{
    def widgetSelected(SelectionEvent event): Unit = {
       //...
    }
}

To this:

addSelectionListener toAnonymousClass(classOf[SelectionListener], { 
    /* .. */ 
})

If there aren’t any libraries that can do this, how would I go about making one? Is it possible?

Answer 1

I believe the following implicit conversion should achieve the result you want:

implicit def selectionListener (f: SelectionEvent => Unit) = 
  new SelectionListener {
    def widgetSelected(event: SelectionEvent) {
      f(event)
    }
  }

It’ll automatically convert your function literals of type SelectionEvent => Unit into the SelectionListener so you’ll be able to use the addSelectionListener method like so:

addSelectionListener { event: SelectionEvent =>
    /* .. */ 
}