/** 
  * Current Account Balances: Graphical Display Applet
  * @author Robert J Morton <robmorton@clara.net>
  * @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
      );

    if(tr.getScale() > 9) {
      active = false;
      // Grey out the buttons if displaying a non-finacial trace
      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 JRadioButton event
  public inflbut(int id, seltrace ST) {
    this.id = id;  // set the id number of this instance of 'inflbut'
    this.ST = ST;  // set the reference to the instance of the above class
  }                // from which it came. (there is only one instance anyway).

  // a JRadioButton event has occurred from JRadioButton 'id'
  public void itemStateChanged(ItemEvent e) {

    /* To avoid a double pass through setYear(): only act on the
    mouse release of the button and not on the mouse press. */

    if (e.getStateChange() == ItemEvent.SELECTED) {

         /* Execute the method in the above applet that
         deals with the radio-button on whose instance of
         'seltracelistener' this method was invoked. */

      switch(id) {
        case 0: ST.setTrace(0); break;
        case 1: ST.setTrace(1); break;
        case 2: ST.setTrace(2);
      }
    }
  }
}