/** 
  * Iteration Rate Selection Panel for DifEqnAp.class
  * @author Robert J Morton
  * @version 27 November 1997 modified 07 August 2009, 18 April 2012 */

/*  This class contains a group of 5 radio buttons for choosing
    how often the selected difference equation is iterated and
    its updated value plotted on the graphs. */

import java.awt.*;        // for graphics operations (GUI)
import java.awt.event.*;  // for the new-fangled 1.1 event handling
import javax.swing.*;     // library for constructing Swing GUI

public class selper extends JPanel {
  private static final long 
    T[] = {
      2000,1000,500,250,100  // update interval choices in millisecs
    };

  private long Period = 100;  // currently selected iteration period

  private difeqnap ap;   // instance reference of the main applet
  private JLabel L;      // period selection panel heading label
  private ButtonGroup G; // to hold the reference for this checkbox group
  private JRadioButton   // to hold the references to 
    a, b, c, d, e;       // the individual radio buttons within it


  // construct the radio button panel
  selper(difeqnap x, Color pc, int ls) {
    ap = x;             // applet instance
    setBackground(pc);  // set panel colour
 
    //lay out items in a single vertical column of 6
    setLayout(new GridLayout(6, 0));

    // Select annotation language: English or Portuguese
    String s = "Plot every";
    if(ls != 0) s = "Traçar cada";

    // Create new label for the above text then add label to this panel.
    L = new JLabel(s,Label.LEFT); add(L);

    G = new ButtonGroup();
    a = new JRadioButton("2 secs", false); G.add(a);
    b = new JRadioButton("1 sec ", false); G.add(b);
    c = new JRadioButton("500ms", false);  G.add(c);
    d = new JRadioButton("250ms", false);  G.add(d);
    e = new JRadioButton("100ms", true);   G.add(e);

    /* Add the above radio buttons to this panel, create Item
    Listeners for then, add them to the event handler list. */
    add(a); a.addItemListener(new perbut(0,this));
    add(b); b.addItemListener(new perbut(1,this));
    add(c); c.addItemListener(new perbut(2,this));
    add(d); d.addItemListener(new perbut(3,this));
    add(e); e.addItemListener(new perbut(4,this));
  }


  void selectPeriod(int i) {
    Period = T[i];         // set the newly selected period
    ap.setPeriod(Period);  // update the iteration period in main applet
  }
}


// LISTENS FOR EVENTS FROM PERIOD SELECTION BUTTONS
class perbut implements ItemListener {
  int id;     // one of the above events
  selper sp;  // the application that called: always the above class

  public perbut(int id, selper sp) {  // constructor for a new checkbox event
    this.id = id;  // set id number pertaining to this instance
    this.sp = sp;  // set the reference to the instance of the class
  }                // from which it came. (there will only be one instance)

  //a checkbox event has occurred from checkbox 'id'
  public void itemStateChanged(ItemEvent e) {
    switch(id) {
      case 0: sp.selectPeriod(0); break;
      case 1: sp.selectPeriod(1); break;
      case 2: sp.selectPeriod(2); break;
      case 3: sp.selectPeriod(3); break;
      case 4: sp.selectPeriod(4);
    }
  }
}