791: Mainline

Of course, you can make analogous changes to the locally defined mouse listener, producing a standalone mouse listener.

• Establish an application instance variable in the listener class.
• Include the application itself as an argument to the listener's constructor.
• Assign the application instance variable in the listener's constructor.

The following illustrates. Again, both the meter and the movie become accessible via the value of the applet variable.

import java.awt.event.*;
public class MeterListener extends MouseAdapter {
 MovieApplication applet;                       
 public MeterListener (MovieApplication a) {    
  applet = a;                                   
 }                                              
 public void mouseClicked (MouseEvent e) {               
  int x = e.getX();                                                      
  int y = e.getY();                                                      
  int v =  
    (int) Math.round(applet.getMeter().getValueAtCoordinates (x, y) 
                     / 3.0 
                    );   
  applet.getMovie().setScript(v);                 
  applet.getMovie().setActing(v);                
  applet.getMovie().setDirection(v);             
 }                                                       
}