Christoph Hartmann on December 13th, 2008

The groovy swing builder is one of Groovys best features. It becomes quite easy to build a gui with the builder. In some cases you may like to add a custom Java swing component to your swing builder. For such cases the swing builder is equipped with the widget() method. The following code uses the swing builder tabbed pane and add a custom component implemented in the getSearchPanel() method as tab.

package de.acidum.candystreams.gui;
import groovy.swing.SwingBuilder
import javax.swing.SwingUtilities
import javax.swing.JFrame
import java.awt.BorderLayout
import javax.swing.JLabel
import javax.swing.JLabel
import javax.swing.JPanel
public class CandystreamsClient implements Runnable {
		// set system property to use mac os menu bar
		System.setProperty("apple.laf.useScreenMenuBar", "true")
		// set the application name for mac os
		System.setProperty("", "CandyStreams")
	public void run() {
		def swing = new SwingBuilder()
		def frame = swing.frame(title: "CandyStreams",
			defaultCloseOperation: JFrame.DISPOSE_ON_CLOSE,
		    size: [800, 600]){
			// add a simple menu bar
			menuBar() {
			    menu(text: "File", mnemonic: 'F') {
			      menuItem(text: "Exit", mnemonic: 'X', actionPerformed: { System.exit(0) })
			// add a tabbed pane
			tabbedPane() {
				panel(title:'Panel 1', tabBackground:java.awt.Color.GREEN,tabToolTip:'Panel1')
                                // add custom swing component
				widget(title:'Search', getSearchPanel())
	public getSearchPanel(){
		JPanel panel = new JPanel()
		panel.add(new JLabel("Search Panel"))
		return panel
	public static void main(String[] args) {
		SwingUtilities.invokeLater(new CandystreamsClient())

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