Scala Swing & Function Literals

I'm confused about how to use Scala Swing elegantly.  I'd like my client code to look something like:

add(new MyButton("Press Me",println("button was pressed")));

The closest I can get is:

  class MyButton(text: String, actionListener: () => Unit) extends JButton(text) {
    addActionListener(new ActionListener() {
      def actionPerformed(ae: ActionEvent) = actionListener()
    })
  }
  addControl(new MyButton("Press Me", () => println("hello")))

Here are my main questions:

1. How to get rid of the ()=> in the client code function literal?
2. How would this be done with scala.swing reactions?
3. Can I get rid of the intermediate MyButton class?
4. Is there a better way to be doing this?

I don't see the advantage of using matching here (as seems to be recommended in scala swing); I just want the action to always be performed on button press, and to ignore all other event types.

Thanks,
Sam Reid

4d0f9db0901160844m10fffe49ie3ba919a744e93b2 [at] mail [dot] gmail [dot] com" type="cite">
    def button(text : String, fun : => Any) =
    {
        val but = new JButton(text);
        but.addActionListener(new ActionListener {
                override def actionPerformed( ae:ActionEvent) = fun
            });
        but
    }

addControl button("mytext",println("shit happened"))

works for you?

On Fri, Jan 16, 2009 at 5:30 PM, Samuel Robert Reid <Reids [at] colorado [dot] edu" rel="nofollow">Reids@colorado.edu> wrote:

I'm confused about how to use Scala Swing elegantly.  I'd like my client code to look something like:

add(new MyButton("Press Me",println("button was pressed")));

The closest I can get is:

  class MyButton(text: String, actionListener: () => Unit) extends JButton(text) {
    addActionListener(new ActionListener() {
      def actionPerformed(ae: ActionEvent) = actionListener()
    })
  }
  addControl(new MyButton("Press Me", () => println("hello")))

Here are my main questions:

1. How to get rid of the ()=> in the client code function literal?
2. How would this be done with scala.swing reactions?
3. Can I get rid of the intermediate MyButton class?
4. Is there a better way to be doing this?

I don't see the advantage of using matching here (as seems to be recommended in scala swing); I just want the action to always be performed on button press, and to ignore all other event types.

Thanks,
Sam Reid

Old thread, but here's how this would be done using the scala.swing
button instead of the native Java swing JButton:

def button(s: String, f: => Any) = new Button(s) {
reactions += {
case ButtonClicked(_) => f
}
}

And yes, this uses pattern matching.