如何在Scala Swing中设置Button的大小？

import scala.swing._
import scala.swing.event._

object Main extends SimpleSwingApplication {
  def top = new MainFrame {
    title = "Button Size Example"
    size = (400, 300)

    val button = new Button {
      text = "Click me"
      preferredSize = (150, 50) // 设置按钮的大小
    }

    contents = button
  }
}