gridbagdemo.scala

JAVA 语言的函数式编程扩展

package scala.swing.test

import swing._
import swing.event._
import GridBagPanel._
import java.awt.Insets

object GridBagDemo extends SimpleGUIApplication {
  val ui = new GridBagPanel {
    val c = new Constraints
    val shouldFill = true
    if (shouldFill) {
      c.fill = Fill.Horizontal
    }

    val button1 = new PushButton("Button 1")

    c.weightx = 0.5

    c.fill = Fill.Horizontal
    c.gridx = 0;
    c.gridy = 0;
    layout(button1) = c

    val button2 = new PushButton("Button 2")
    c.fill = Fill.Horizontal
    c.weightx = 0.5;
    c.gridx = 1;
    c.gridy = 0;
    layout(button2) = c

    val button3 = new PushButton("Button 3")
    c.fill = Fill.Horizontal
    c.weightx = 0.5;
    c.gridx = 2;
    c.gridy = 0;
    layout(button3) = c

    val button4 = new PushButton("Long-Named Button 4")
    c.fill = Fill.Horizontal
    c.ipady = 40;      //make this component tall
    c.weightx = 0.0;
    c.gridwidth = 3;
    c.gridx = 0;
    c.gridy = 1;
    layout(button4) = c

    val button5 = new PushButton("5")
    c.fill = Fill.Horizontal
    c.ipady = 0;       //reset to default
    c.weighty = 1.0;   //request any extra vertical space
    c.anchor = Anchor.PageEnd
    c.insets = new Insets(10,0,0,0);  //top padding
    c.gridx = 1;       //aligned with button 2
    c.gridwidth = 2;   //2 columns wide
    c.gridy = 2;       //third row
    layout(button5) = c
  }
  
  def top = new MainFrame {
    title = "GridBag Demo"
    contents = ui
  }
}