/** 
  * Current Account Balances: Graphical Display Applet
  * @author Robert J Morton UK-YE572246C <rob@robmorton.20m.com>
  * @version 12 July 2000, 27 April 2012
  * @copyright July 2000 Robert J Morton (all rights reserved) */

//  THE INFLATION-SELECTOR BUTTONS CLASS

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


public class seltrace extends JPanel {

  private trace TR;  // instance reference of the graph display panel

  //false: buttons are inactive because it's a non-financial graph
  private boolean active = true;


  seltrace(graphs ap, trace TR) {  // INSTANCE CONSTRUCTOR

    this.TR = TR;     // graph display panel instance reference
    setLayout(null);  // set for panel to be laid out manually

    // create a button group for the radio buttons
    ButtonGroup G = new ButtonGroup();

    JRadioButton 
      A = new JRadioButton(
        "Show the graph as original monetary values.", false
      ), 
      B = new JRadioButton(
        "Show the graph inflation-corrected to £Y2k.", true
      ), 
      C = new JRadioButton(
        "Show both real and inflation-corrected traces.", false
      );

    // grey-out the buttons if displaying a non-finacial trace

    if(Integer.valueOf(ap.getParameter("scale")).intValue() > 9) {
      active = false;
      A.setForeground(Color.lightGray);
      B.setForeground(Color.lightGray);
      C.setForeground(Color.lightGray);
    }

    G.add(A); G.add(B); G.add(C);  // add them to the button group
    add(A); add(B); add(C);        // add them to this panel

    A.setBounds(0,  0, 500, 19);   // set their positions and size
    B.setBounds(0, 23, 500, 19);
    C.setBounds(0, 46, 500, 19);

    A.addItemListener(new inflbut(0, this));  // add listerners to them
    B.addItemListener(new inflbut(1, this));
    C.addItemListener(new inflbut(2, this));
  }


  void setTrace(int i) { if(active) TR.setTrace(i); }
}



// LISTENS FOR EVENTS FROM THE YEAR SELECTOR JRadioButtonES
class inflbut implements ItemListener {

  int id;       // one of the above events
  seltrace ST;  // the application that called: always the above class

  /* Constructor for a new checkbox event: sets the 'id' number pertain-
  ing to this instance of 'graphbut' and the reference to the instance
  of the above class from which it came. (only one instance anyway). */

  public inflbut(int id, seltrace ST) { this.id = id; this.ST = ST; }

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