/** 
  * Route selector for Rob's Moving Map package
  * @author Robert J Morton YE572246C
  * @version 27 November 1997
*/
/*  This class contains a drop-down menu object for choosing
    which of the three 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;

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

  private int rn = 0,  // route number

    /* Position on applet panel of top left corner of route
    selector, plus width and height of the route selector. */

    Rx =  15, Ry =  15, Rw = 275, Rh =  35;


  // construct the radio button 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, add it to
    the applet pane and set its position and size. */

    routes = new JComboBox<String>(); 
    cp.add(routes);
    routes.setBounds(Rx,Ry,Rw,Rh);

    //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) {      // Create a string array of 'x' elements
    RouteNames = new String[x];  // to hold all route names and set its
    rn = 0;                      // access index to point to the first name.
  }

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

  // Copy the route names from the array RouteNames[] to the 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 invoked above. 
  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
    if(ld.DefaultsLoaded()  // These two boolean conditions are set on diff-
    && RoutesInstalled) {   // erent threads. That's why both are necessary.

      // Initiate loading of the selected route's geographic features.
      ld.loadRoute(routes.getSelectedIndex());

      bp.setGrey();  // set the button annotations to grey
    }
  }

  // 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 name of the next route.
  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 'Routes' 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'
  public void itemStateChanged(ItemEvent e) {
    // Execute the appropriate method in the above applet
    switch(id) { case ROUTE: rs.routeSelect(); break; }
  }
}