// -------------------------------------------------------------------
// AngleControl - Object representing a row (x, y or z axis), includes
//                a numeric readout, four buttons: < << >> > to move
//                the axis by 1's or 10's and a slider.
// -------------------------------------------------------------------

import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JSlider;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.event.ChangeListener;
import javax.swing.event.ChangeEvent;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class AngleControl extends JPanel
   implements ActionListener, ChangeListener
{
   private JTextField readout           = null;
   private JButton smallIncrement       = null;
   private JButton bigIncrement         = null;
   private JButton smallDecrement       = null;
   private JButton bigDecrement         = null;
   private JSlider slider               = null;
   private int angle                    = 0;
   private AngleChangeObserver observer = null;

   public AngleControl(
      int initialValue, String label, AngleChangeObserver observer
   )
   {
      super(new FlowLayout());

      this.observer = observer;
      angle         = initialValue;

      readout = new JTextField(5);
      readout.setEditable(false);
      updateReadout(angle);

      smallIncrement = new JButton(">");
      bigIncrement   = new JButton(">>");
      smallDecrement = new JButton("<");
      bigDecrement   = new JButton("<<");

      smallIncrement.addActionListener(this);
      bigIncrement.addActionListener(this);
      smallDecrement.addActionListener(this);
      bigDecrement.addActionListener(this);

      slider = new JSlider(SwingConstants.HORIZONTAL, 0, 360, angle);
      slider.addChangeListener(this);

      add(new JLabel(label));
      add(readout);
      add(smallDecrement);
      add(bigDecrement);
      add(bigIncrement);
      add(smallIncrement);
      add(slider);
   }

   public int getAngle() { return(angle); }

   private void updateReadout(int newValue)
   {
      readout.setText("" + newValue);
      observer.angleChanged(newValue);
   }

   private void updateSlider(int newValue)
   {
      slider.setValue(newValue);
   }

   public void actionPerformed(ActionEvent e)
   {
      Object src = e.getSource();

      if(src == smallIncrement)
         angle++;

      else if(src == smallDecrement)
         angle--;

      else if(src == bigIncrement)
         angle += 10;

      else
         angle -= 10;

      if(angle >= 360)
         angle -= 360;

      else if(angle < 0)
         angle += 360;

      updateReadout(angle);
      updateSlider(angle);
   }

   public void stateChanged(ChangeEvent e)
   {
      angle = ((JSlider)e.getSource()).getValue();
      updateReadout(angle);
   }
}