/** 
  * Refresh Rate Selection Panel for Rob's Moving Map package
  * @author Robert J Morton
  * @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 {

  private static final long 
    serialVersionUID = 13L;  // what the hell this is for, I don't know!

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

  private static refreshrate
    sr;  // reference to current object
  private ButtonGroup
    G;   // reference for this JRadioButton group
  private JRadioButton
    a,
    b,   // references to individual JRadioButtones within it
    c;

  private int I = 3;  // number of buttons
  private movmap mm;  // object reference to the main applet
  private Color bg;   // background colour for buttons


  //construct the radio button panel
  refreshrate(movmap mm) {
    this.bg = bg;  // background colour for selector buttons
    this.mm = mm;  // local variable for object reference to main applet
    setOpaque(false);
    sr = this;     // reference to refreshrate object

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

    // incorporate them into a mutually-exclusive group
    G = new ButtonGroup();

    a = new JRadioButton("",true);
    G.add(a);
    add(a);
    a.addItemListener(new ratebut(0,this));
    a.setOpaque(false);

    b = new JRadioButton("",false);
    G.add(b);
    add(b);
    b.addItemListener(new ratebut(1,this));
    b.setOpaque(false);

    c = new JRadioButton("",false);
    G.add(c);
    add(c);
    c.addItemListener(new ratebut(2,this));
    c.setOpaque(false);
  }


  void selectRate(int i) {    // REFRESH RATE i HAS JUST BEEN SELECTED
    mm.setRefreshRate(R[i]);  // set refresh rate in main applet
  }
}



// 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 number of this instance of 'refreshrate'
    this.sr = sr;  // set the reference to the instance of the applet
  }                // from which it came. (only ever 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); 
    }
  }
}