899: Mainline

To stop a thread, you assign a signaling value to a variable tested inside the run method. In the following, for example, a mouse listener assigns true to the stopper variable, which is tested each time that run loops inside the marquee thread. As soon as stopper is true, run returns. Thus, you can stop the marquee by clicking on it.

import java.awt.*;
import java.awt.event.*;        
import javax.swing.*;
public class Marquee extends JComponent {
 MarqueeThread thread;
 String message;
 int position, drop, initialPosition, delta, messageWidth;
 Font messageFont = new Font("TimesRoman", Font.BOLD, 24);
 boolean ready = false;
 boolean stopper = false;                       
 public Marquee (String s) {
  message = s;
  addMouseListener(new MarqueeListener());      
  thread = new MarqueeThread(this);
  thread.start();
 }
 // Definition of decrementPosition as in Segment 886
 // Definition of paint as in Segment 886
 class MarqueeListener extends MouseAdapter {   
  public void mouseClicked(MouseEvent e) {      
   stopper = true;                              
  }                                             
 }                                              
 class MarqueeThread extends Thread {
  private Marquee marquee;
  public MarqueeThread (Marquee c) {
   marquee = c;
  }
  public void run () {
   while (true) {
    if (stopper) {return;}                      
    ChangeHandler changeHandler = new ChangeHandler(marquee); 
    SwingUtilities.invokeLater(changeHandler);               
    try{sleep(200);}                              
    catch (InterruptedException e) {}      
   } 
  } 
 } 
 class ChangeHandler implements Runnable { 
  private Marquee marquee; 
  public ChangeHandler (Marquee c) { 
   marquee = c; 
  } 
  public void run() { 
   marquee.decrementPosition(); 
  } 
 } 
 public Dimension getMinimumSize() {return new Dimension(300, 50);} 
 public Dimension getPreferredSize() {return new Dimension(300, 50);} 
}