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

public class ColorTest extends Applet
{
  Panel back_color;
  ColorControls back_red, back_green, back_blue;

  public void init()
  {
    setLayout(new GridLayout(4,1,10,10));

    back_color= new Panel();
    back_color.setBackground(Color.white);
    add(back_color);

    back_red= new ColorControls(this, "red", 255);
    back_green= new ColorControls(this, "green", 255);
    back_blue= new ColorControls(this, "blue", 255);

    add(back_red);
    add(back_green);
    add(back_blue);
  }

  public Insets insets()
  {
    return new Insets(10,10,10,10);
  }  

  public void update()
  {
    Color c;

    c= new Color(back_red.bar.getValue(), back_green.bar.getValue(), back_blue.bar.getValue());
    back_color.setBackground(c);
 System.out.println("red "+back_red.bar.getValue()+" green "+back_green.bar.getValue()+" blue "+back_blue.bar.getValue());
  }

}

//-----------another class definition----------------------------

class ColorControls extends Panel
{
  ColorTest outerparent; //reference to parent class
  Scrollbar bar;
  Label display_val;

  ColorControls(ColorTest target, String s, int val)
  {
    this.outerparent= target;
    setLayout(new GridLayout(1,3,10,10));

    bar= new Scrollbar(Scrollbar.HORIZONTAL, val, 0, 0, 255);
    display_val= new Label(String.valueOf(val), Label.RIGHT);
  
    this.add(new Label(s, Label.RIGHT));
    this.add(display_val);
    this.add(bar);
  }

  public Insets insets()
  {
    return new Insets(10,10,0,0);  
  }

  public boolean handleEvent(Event evt)
  {
    if (evt.target instanceof Scrollbar)
    {
      int x= ((Scrollbar)evt.target).getValue();
      this.display_val.setText(String.valueOf(x));
     
      outerparent.update();
      return true;
    }
    else return false;
  }
 } //end of ColorControls class