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object GUI_Panel_Layout extends SimpleSwingApplication{
def top = new MainFrame {
title = "Second GUI"
val button = new Button {
text = "Scala"
}
val label = new Label {
text = "Here is Spark!!!"
}
contents = new BoxPanel(Orientation.Vertical) { //垂直布局
contents += button
contents += label
border = Swing.EmptyBorder(50, 50, 50, 50)
}
listenTo(button) //监听button，解除监听为deafTO
var clicks =0
reactions += { //处理事件
case ButtonClicked(button) => { //偏函数匹配点击事件
clicks += 1
label.text = "Clicked " + clicks + " times"
}
}
}
}

object GUI_Event extends SimpleSwingApplication {

val fileChooser = new FileChooser(new File("."))
fileChooser.title = "File Chooser"
val button = new Button {
    text = "Choose a File from local"
}
val label = new Label {
    text = "No any file selected yet."
}
val mainPanel = new FlowPanel {
    contents += button
    contents += label
}
def top = new MainFrame {
    title = "Scala GUI Programing advanced!!!"
    contents = mainPanel //mainPanel里有buuton、label

    listenTo(button) //监听button

    reactions += { //事件栈
      case ButtonClicked(b) => {
        val result = fileChooser.showOpenDialog(mainPanel) //打开对话框时指定父容器
        if (result == FileChooser.Result.Approve) { //如果选择了文件
          label.text = fileChooser.selectedFile.getPath() //修改label.text
        }
      }
    }
}

}

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Scala界面Pannel、Layout

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