import java.awt.*;
import java.awt.event.*;

class FarveValgGUI {
  
  Scrollbar rød = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 255);
  TextField irød = new TextField("0",3);
  Scrollbar grøn = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 255); 
  TextField igrøn = new TextField("0",3);
  Scrollbar blå = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 255);
  TextField iblå = new TextField("0",3);
  Canvas farveCanvas = new FarveCanvas();
  
  int ri, gi, bi;

  class FarveCanvas extends Canvas {
    public void paint(Graphics gr) {
      setBackground(new Color(ri,gi,bi));
    }

    public void update(Graphics gr) {
      paint(gr);
    }

    public Dimension getPreferredSize() { 
      return new Dimension(200,200); 
    }

    public Dimension getMinimumSize() { 
      return getPreferredSize();
    }
  }

  class SkyderLytterRød implements AdjustmentListener {
    public void adjustmentValueChanged(AdjustmentEvent e) {
      ri = e.getValue();
      irød.setText(""+ri);
      farveCanvas.repaint();
    }
  }

  class SkyderLytterGrøn implements AdjustmentListener {
    public void adjustmentValueChanged(AdjustmentEvent e) {
      gi = e.getValue();
      igrøn.setText(""+gi);
      farveCanvas.repaint();
    }
  }

  class SkyderLytterBlå implements AdjustmentListener {
    public void adjustmentValueChanged(AdjustmentEvent e) {
      bi = e.getValue();
      iblå.setText(""+bi);
      farveCanvas.repaint();
    }
  }

  Frame f  = new ClosableFrame("Farvevalg");

  FarveValgGUI() {
    f.setLayout(new BorderLayout());

    Panel skydere = new Panel();
    skydere.setLayout(new GridLayout(3,1));

    rød.addAdjustmentListener(new SkyderLytterRød());
    grøn.addAdjustmentListener(new SkyderLytterGrøn());
    blå.addAdjustmentListener(new SkyderLytterBlå());
    Panel r = new Panel();
    r.setLayout(new BorderLayout());
    r.add(rød,"Center");
    r.add(irød,"East");
    irød.setEditable(false);
    skydere.add(r);
    Panel g = new Panel();
    g.setLayout(new BorderLayout());
    g.add(grøn,"Center");
    g.add(igrøn,"East");
    igrøn.setEditable(false);
    skydere.add(g);
    Panel b = new Panel();
    b.setLayout(new BorderLayout());
    b.add(blå,"Center");
    b.add(iblå,"East");
    iblå.setEditable(false);
    skydere.add(b);
    f.add(skydere, "North");

    f.add(farveCanvas, "Center");
    
    f.pack();
    f.show();
  }

  public static void main(String[] args) {
    new FarveValgGUI();
  }
}