/* This example demonstrates the use of the Scrollbar class,
    the Canvas class, and nested Panels. */

     import java.applet.*;
     import java.awt.*;

     public class ColorScroll extends Applet {

       Panel p;
       Canvas c;
   
       Label redLabel     = new Label("Red 0");
       Label greenLabel   = new Label("Green 0");
       Label blueLabel    = new Label("Blue 0");

       Scrollbar red   = new Scrollbar(
                         Scrollbar.HORIZONTAL, 0, 0, 0, 255);
       Scrollbar green = new Scrollbar(
                         Scrollbar.HORIZONTAL, 0, 0, 0, 255);
       Scrollbar blue  = new Scrollbar(
                         Scrollbar.HORIZONTAL, 0, 0, 0, 255);


    
       public void init() {

          setLayout(new BorderLayout()); // Applet uses BorderLayout
          setBackground(Color.white);

          p = new Panel();
          p.setLayout(new GridLayout(3, 2));
          p.add(redLabel);
          p.add(red);
          p.add(greenLabel);
          p.add(green);
          p.add(blueLabel);
          p.add(blue);
          add("South", p);
      
          c = new Canvas();
          c.setBackground(new Color(0, 0, 0));
          add("Center", c);
       }
           
       public boolean handleEvent(Event evt) {
          if (evt.target instanceof Scrollbar) {
             if (evt.id == Event.SCROLL_ABSOLUTE  ||
                 evt.id == Event.SCROLL_LINE_DOWN ||
                 evt.id == Event.SCROLL_LINE_UP   ||
                 evt.id == Event.SCROLL_PAGE_DOWN ||
                 evt.id == Event.SCROLL_PAGE_UP  ) {  
             

                redLabel.setText("Red " + red.getValue());
                greenLabel.setText("Green " + green.getValue());         
                blueLabel.setText("Blue " + blue.getValue());

                Color newColor = new Color(red.getValue(),
                                           green.getValue(),
                                           blue.getValue());

                c.setBackground(newColor);
      
                c.repaint();
                return true;
             }
          }
          return super.handleEvent(evt);
       }
     }