/** 
  * Route selector for Rob's Moving Map package
  * @author Robert J Morton
  * @version 27 November 1997
*/
/*  This class contains a drop-down menu object for choosing
    which of the six routes is to be flown. */

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 routesel {
  private JComboBox<String> routes;  // reference for this checkbox group
  private boolean RoutesInstalled = false;

  private static routesel rs;  // reference to route selector object
  private loader ld;           // reference to the loader object
  private movmap mm;           // object reference to the main applet
  private butpanel bp;         // reference to button panel object

  private String
    RouteNames[]; // names of routes to be installed in the route selector

  private int 
    rn = 0,    // route number
    Rx =  15,  // x-coord of top left corner of route selector
    Ry =  15,  // y-coord of top left corner of route selector
    Rw = 275,  // width of route selector
    Rh =  35;  // height of route selector


  // CONSTRUCT THE RADIO BUTTONS PANEL
  routesel(movmap mm, Container cp, butpanel bp) { 

    this.mm = mm;  // local variable for object reference to main applet
    this.bp = bp;  // reference to the button panel object
    rs = this;     // set reference to route selector object

    // create the route selector choice menu
    routes = new JComboBox<String>();

    cp.add(routes);                 // add it to the applet content pane
    routes.setBounds(Rx,Ry,Rw,Rh);  // set its position and size

    //create and register an event listener for the above choice menu
    routes.addItemListener(new rslisten(rslisten.ROUTE,this));
  }


  void setLoader(loader ld) { this.ld = ld; }


  void clearRoutes(int x) {      // x is the number of available routes
    RouteNames = new String[x];  // string array to hold the route names

    rn = 0;  // set its access index to point to the first name
  }


  void addRoute(String s) {RouteNames[rn++] = s;}


  //copy route names from array RouteNames[] to Choice Menu
  void installRoutes() {
    RoutesInstalled = false;
    try {
      SwingUtilities.invokeLater(
        new Runnable() {
          public void run() { 
            install(); 
          }
        }
      );
    } catch (Exception e) { } 
  }


  // this has to be done on the event dispatching thread
  private void install() {
    routes.removeAllItems();
    for(int i = 0; i < rn; i++)
      routes.addItem(RouteNames[i]);
    routes.setSelectedIndex(0);
    RoutesInstalled = true;
  }

  void routeSelect() {  // A NEW ROUTE HAS JUST BEEN SELECTED

    /* NOTE: these two boolean conditions are set on different
    threads. That's why both are necessary. If they are both true,
    initiate loading of the selected route's features and set the
    button annotations to grey. */

    if(ld.DefaultsLoaded() && RoutesInstalled) {
      ld.loadRoute(routes.getSelectedIndex());
      bp.setGrey();
    }
  }

  // Select the route name within the routes Choice menu.
  void selectRouteName(int i) {
    routes.setSelectedIndex(i);
  }

  // Return the total number of available routes.
  int getTotalRoutes() {
    return routes.getItemCount();
  }

  // Get the next route name.
  String getRouteName(int i) {
    String s = routes.getItemAt(i);
    return s.toLowerCase();
  }
}



// LISTENS FOR EVENTS FROM THE CHOICE MENU SELECTORS
class rslisten implements ItemListener {
  static final int
    ROUTE = 0;  // an event from the 'Stations' Choice Menu
  int id;       // one of the above events
  routesel rs;  // the application that called: always the above applet!

  // constructor for a new Choice selection event
  public rslisten(int id, routesel rs) {
    this.id = id;  // set the id number for this instance of 'rslisten'
    this.rs = rs;  // set the reference to the instance of the 'hfbrx' applet
  }                // from which it came. (there will only be one instance).

  /* A Choice selection event has occurred from checkbox
  'id' so execute the method in the above applet. */

  public void itemStateChanged(ItemEvent e) {
    switch(id) { case ROUTE: rs.routeSelect(); break; }
  }
}