import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;

//-------------------------------------------------------------------------
/**
 * Demonstrates a graphical user interface and an event listener.
 *
 *  @author John Lewis
 *  @version 2010.02.08
 */
public class PushCounterPanel
    extends JPanel
{
    //~ Instance/static variables .............................................

    private int count;
    private JButton push;
    private JLabel label;


    //~ Constructors ..........................................................

    // ----------------------------------------------------------
    /**
     * Sets up the GUI.
     */
    public PushCounterPanel()
    {
        count = 0;

        push = new JButton("Push Me!");
        push.setName("button");
        push.addActionListener(new ActionListener()
            {
                public void actionPerformed(ActionEvent e)
                {
                    increment();
                }
            });

        label = new JLabel("Pushes: " + count);
        label.setName("count");

        add(push);
        add(label);

        setPreferredSize(new Dimension(300, 40));
        setBackground(Color.cyan);
    }

    public void increment()
    {
        count++;
        label.setText("Pushes: " + count);
    }

    //~ Private methods/declarations ..........................................

    // ----------------------------------------------------------
    /**
     * Represents a listener for button push (action) events.
     */
    private class ButtonListener
        implements ActionListener
    {
        // ----------------------------------------------------------
        /**
         * Updates the counter and label when the button is pushed.
         * @param event The GUI event, which is ignored by this method.
         */
        public void actionPerformed(ActionEvent event)
        {
            increment();
        }
    }
}