import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 * 
 */

/**
 * @author barbaralerner
 *
 */
public class Hello implements ActionListener{
	

	private JLabel label;
	private JButton countButton;
	private JButton cancelButton;
	private int counter = 0;
	private Thread countingThread;


	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new Hello();
	}
	
	public Hello() {
		JFrame frame = new JFrame();
		Container contentPane = frame.getContentPane();
		label = new JLabel("Hello");
		contentPane.add(label, BorderLayout.CENTER);
		
		JPanel buttonPanel = new JPanel();
		countButton = new JButton ("Count");
		buttonPanel.add(countButton);
		contentPane.add(buttonPanel, BorderLayout.SOUTH);
		countButton.addActionListener (this); 
		cancelButton = new JButton ("Cancel");
		buttonPanel.add(cancelButton);
		contentPane.add(buttonPanel, BorderLayout.SOUTH);
		cancelButton.addActionListener (this); 
		
		final JSlider sizeSlider = new JSlider(JSlider.HORIZONTAL);
		contentPane.add (sizeSlider, BorderLayout.NORTH);
		sizeSlider.addChangeListener(new ChangeListener() {

			public void stateChanged(ChangeEvent arg0) {
				label.setFont(label.getFont().deriveFont((float) sizeSlider.getValue()));				
			}
			
		});
		
		frame.setSize(new Dimension (200, 200));
		frame.setVisible(true);
	}
	
	public void actionPerformed(ActionEvent event) {
		if (event.getSource() == countButton) {
			countingThread = new Thread(new SlowCounter());
			countingThread.start();
		}
		else {
			countingThread.interrupt();
		}

	}
	
	class SlowCounter implements Runnable {
		public void run() {
			counter++;
			try {
				Thread.sleep(10000);
				label.setText("" + counter);
			} catch (InterruptedException e) {
				label.setText ("Cancelled");
			}
			
		}
	}
			
}