Scala -扩展了MainFrame()、GridBagPanel()和“reactions”

Question

为了使应用程序更有条理，我在新类中定义了(例如Frame )，然后定义了Panel或GridBagPanel，如：

class TestGridBagPanel extends GridBagPanel { }
class TestFrame extends MainFrame { 
   contents = new TestGridBagPanel
   reactions = new React // ??
}
class React extends WHAT??  { }

... // and so on and then called in top() method like this:

object TestApp extends SimpleSwingApplication {
  def top = new TestFrame { }
 }

我的问题是，在反应类中，我不知道extend的哪个组件，我必须从Buttons、TextFields和CheckBoxes那里收听。

Answer 1

你的反应课应该是

class React extends PartialFunction[Event,Unit]{
    override def isDefinedAt(x: Event): Boolean = ...

    override def apply(e: Event): Unit = e match {
        case e: MouseDragged => {}
        case e: MousePressed => {}
    }
}