/** 
  * 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 FILE-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 selfile extends JPanel {

  private boolean   //which buttons are required
    BR[] = {false,false,false,false,false,false,false}; 

  private String   
    BL[] = {"label0","label1","label2","label3","label4","label5","label6"},
    DF[] = {"file0", "file1", "file2", "file3", "file4", "file5", "file6"},
    FN;  // filename of current data file

  private int
    NB = 7,  // total number of buttons (max is 10)
    nf = 7;  // number of files available

  private loader LD;  // instance reference of the loader


  selfile(graphs ap, loader LD, trace TR) {
    this.LD = LD;     // copy instance reference of the loader
    setLayout(null);  // to allow the control panels to be laid out manually

    // GET THE NUMBER OF .DAT FILES FROM HTML PARAMETER
    nf = Integer.valueOf(ap.getParameter("files")).intValue();
    if(nf > 7) nf = 7;  // only room for 7 buttons

    // GET THE SCALING FACTOR INDEX NUMBER FROM THE HTML PARAMETER
    int sf = Integer.valueOf(ap.getParameter("scale")).intValue();

    if(sf > 9)         // If a non-money scale were specified, 
      TR.setTrace(0);  // show only the main (non-inflation-corrected) trace
    else               // otherwise 
      TR.setTrace(1);  // show only the inflation-corrected trace by default.

    for(int i = 0; i < nf; i++) {      // For each of the required traces, 
      DF[i] = ap.getParameter(DF[i]);  // get name of its data file,
      BL[i] = ap.getParameter(BL[i]);  // substitute the required button label
      BR[i] = true;                    // and set up which buttons are 
    }                                  // required in upper group.

    //DEFAULT BUTTON STATES
    boolean DB[] = {false,false,false,false,false,false,false};
    try {                   // Try to get the specified default radio button
      int df = Integer.valueOf(ap.getParameter("default")).intValue();
      DB[df] = true;        // and set it and
      FN = DF[df];          // its data name as the default.
    } catch(Exception e) {  // if default button parameter is not present
      DB[nf - 1] = true;    // set the last radio button 
      FN = DF[nf - 1];      // and the data name as default
    }
    // Create a radio button group and an array for radio button references
    ButtonGroup G = new ButtonGroup();
    JRadioButton B[] = new JRadioButton[NB];

    for(int i = 0; i < NB; i++)  // For each button in the upper group

      if(BR[i]) {     // if button required for this instance of graph
        B[i] = new JRadioButton(BL[i], DB[i]);
        G.add(B[i]);  // add it to the button group
        add(B[i]);    // and to the panel

        // and set its position and size within the panel
        B[i].setBounds(0,i * 25,240,20);

        /* create an event listener for it and add
        the listener to the event handler list */
        B[i].addItemListener(new graphbut(i,this));
      }

    LD.getData(DF[nf - 1]);  // trigger loading of the default data-file
  }


  void getData(int i) {   // Called only by the listener class below:
    if(i > -1 && i < nf)  // Provided the selection is within the valid range
      LD.getData(DF[i]);  // trigger the loader to get the selected file.
  }
}



// LISTENS FOR EVENTS FROM THE FILE SELECTOR BUTTONS
class graphbut implements ItemListener {

  int id;      // one of the above events
  selfile SF;  // the application that called: always the above class

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

  public graphbut(int id, selfile SF) { this.id = id; this.SF = SF; }

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

    /* Using the number of radio-button on whose instance  of
    'graphbut' this method was invoked, execute the getData()
    method in the above class. */

      case 0: SF.getData(0); break; case 1: SF.getData(1); break;
      case 2: SF.getData(2); break; case 3: SF.getData(3); break;
      case 4: SF.getData(4); break; case 5: SF.getData(5); break;
      case 6: SF.getData(6); break;
    }
  }
}