/** 
  * 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 static refreshrate sr;  // reference to current object

  /* A reference for this JRadioButton group and
  to the individual JRadioButtones within it. */

  private ButtonGroup G;
  private JRadioButton a, b, c;

  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) {
    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

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

    /* Create a group in which to place the radio buttons so that
    when one is selected all the others automatically de-select. */

    G = new ButtonGroup();

    /* Create each of the 3 radio buttons, add it to the Group and to the
    applet panel, create an item listener for it to listen for when it is
    clicked by the mouse and then set it visible upon the applet panel. */

    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 reference to this instance of the applet
  }                // from which it came. (there'll 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);
    }
  }
}