/** 
  * Refresh Rate Selection Panel for Rob's Moving Map package
  * @author Robert J Morton YE572246C
  * @version 13 November 2007
*/
/*  This class contains a group of 3 radio buttons for choosing
    which of the three offered refresh rates is to be used. */

import javax.swing.*;     // Java Swing GUI utilities
import java.awt.*;        // Java Abstract Windowing Toolkit
import java.awt.event.*;  // for the new-fangled 1.1 event handling

public class refreshrate extends JPanel {

  // what the hell this is for, I don't know!
  private static final long serialVersionUID = 2012L;

  private static refreshrate sr;  // reference to current object

  private ButtonGroup G;         // reference for this JRadioButton group
  private JRadioButton a, b, c;  // references to the JRadioButtones in it
  private int I = 3;             // number of buttons

  private movmap mm;  // object reference to the main applet
  private Color bg;   // background colour for buttons

  private long R[] = {1000,200,40};  // refresh rate options


  refreshrate(movmap mm) {  // construct the radio button panel

    this.bg = bg;  // background colour for selector buttons
    this.mm = mm;  // local variable for object reference to main applet
    sr = this;     // reference to refreshrate object

    setOpaque(false);  // make the panel transparent

    // This is to make the buttons lie in a single column
    setLayout(new GridLayout(I,1)); 

    G = new ButtonGroup();  // Create a radio button GROUP for the buttons

    // Create each of the buttons, add it to the GROUP and also to the panel
    a = new JRadioButton("", true);  G.add(a); add(a); 
    b = new JRadioButton("", false); G.add(b); add(b); 
    c = new JRadioButton("", false); G.add(c); add(c); 

    // Create a listener for each button and make it transparent.
    a.addItemListener(new ratebut(0, this)); a.setOpaque(false);
    b.addItemListener(new ratebut(1, this)); b.setOpaque(false);
    c.addItemListener(new ratebut(2, this)); c.setOpaque(false);
  }

   // Refresh rate 'i' has just been selected so set it in the main applet
   void selectRate(int i) { mm.setRefreshRate(R[i]); }
}



// LISTENS FOR EVENTS FROM REFRESH RATE SELECTION BUTTONS
class ratebut implements ItemListener {

  int id;            // one of the above events
  refreshrate sr;    // the application that called: always the above applet!

  // constructor for a new JRadioButton event
  public ratebut(int id, refreshrate sr) {

    this.id = id;  // set id pertaining to this instance of 'refreshrate'
    this.sr = sr;  // set the reference to the instance of the applet
  }                //from which it came. (there will only be one instance)

  // a JRadioButton event has occurred from JRadioButton 'id'
  public void itemStateChanged(ItemEvent e) {
    switch(id) {
      case 0: sr.selectRate(0); break;
      case 1: sr.selectRate(1); break;
      case 2: sr.selectRate(2);
    }
  }
}