點選(此處)摺疊或開啟

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) { //垂直佈局
contents += button
contents += label
border = Swing.EmptyBorder(50, 50, 50, 50)
}
listenTo(button) //監聽button，解除監聽為deafTO
var clicks =0
reactions += { //處理事件
case ButtonClicked(button) => { //偏函式匹配點選事件
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裡有buuton、label

    listenTo(button) //監聽button

    reactions += { //事件棧
      case ButtonClicked(b) => {
        val result = fileChooser.showOpenDialog(mainPanel) //開啟對話方塊時指定父容器
        if (result == FileChooser.Result.Approve) { //如果選擇了檔案
          label.text = fileChooser.selectedFile.getPath() //修改label.text
        }
      }
    }
}

}

Scala介面Pannel、Layout

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