SwingGadget.java

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package jpl.util;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;

public class SwingGadget extends JFrame
        {
        private static final long       serialVersionUID        = 1L;

        public int numClicks = 0;       // can be changed e.g. from Prolog

        private static String labelPrefix = "Number of button clicks: ";
        final JLabel label = new JLabel(labelPrefix + "0    ");

        public SwingGadget(String caption)
                {
                super(caption);         // call the JFrame contructor

                JButton button = new JButton("I'm a Swing button!");

                button.addActionListener(
                        new ActionListener()
                                {
                                public void actionPerformed(ActionEvent e)
                                        {
                                        inc();
                                        }
                                }
                );

                label.setLabelFor(button);

                JPanel pane = new JPanel();
                pane.setBorder(BorderFactory.createEmptyBorder(30,30,10,30));
                pane.setLayout(new GridLayout(0, 1));
                pane.add(button);
                pane.add(label);

                try     {
                        UIManager.setLookAndFeel(
                                UIManager.getCrossPlatformLookAndFeelClassName()
                        );
                        }
                catch (Exception e)
                        {
                        }

                getContentPane().add(pane, BorderLayout.CENTER);

                addWindowListener(new WindowAdapter()
                        {
                        public void windowClosing(WindowEvent e)
                                {
                             // System.exit(0);
                                setVisible(false);
                                }
                        }
                );
                pack();
                setVisible(true);
                }

        public synchronized void inc()
                {
                numClicks++;
                label.setText(labelPrefix + numClicks);
                notifyAll();
                }

        public synchronized boolean dec()
                {
                try     {
                        while ( numClicks <= 0 )
                                {
                                wait();
                                }
                        numClicks--;
                        label.setText(labelPrefix + numClicks);
                        return true;
                        }
                catch ( InterruptedException e )
                        {
                        return false;
                        }
                }
        }

---

jpl
Author(s): Lorenz Moesenlechner
autogenerated on Fri Jan 11 09:40:29 2013