/** 
  * 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 static routesel rs;        // reference to route selector object
  private loader ld;                 // reference to the loader object
  private JComboBox<String> routes;  // reference for this checkbox group
  private movmap mm;                 // object reference to the main applet
  private butpanel bp;               // reference to button panel object
  private boolean RoutesInstalled = false;
  private String RouteNames[];       // names of routes to be installed in
                                     // the route selector
  private int 
    rn = 0,              // route number
    Rx =  15, Ry =  15,  // top left corner of route selector
    Rw = 275, Rh =  35;  // width and height of route selector


  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

    routes = new JComboBox<String>();  // create route selector choice menu
    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 diff-
    erent 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; }
  }
}