// Fig. 11.4: ButtonHandler.java
// Handle event for a button in the MyCanvas applet.
import java.awt.event.*;

public class ButtonHandler implements ActionListener {
   private CustomCanvas canvas;
   private int shape;

   public ButtonHandler( CustomCanvas c, int s )
   {
      canvas = c;
      shape = s;
   }

   public void actionPerformed( ActionEvent e )
   {
      canvas.draw( shape );
   }
}