/** 
  * 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 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 selwp {
  private static selwp ws;  // reference to waypoint selector object
  private butpanel bp;      // reference to button panel object
  private airmap am;        // reference to air map object
  private navpanel np;      // reference to nav panel object
  private loader ld;        // reference to the loader object

  private JComboBox<String>
    waypoints;  // reference for this checkbox group

  private movmap mm;    // object reference to the main applet
  private msgpanel mp;  // object reference to message panel

  private int 
    wn = 0,    // waypoint number
    Wx = 305,  // x-coord of top left corner of waypoint selector
    Wy = 380,  // y-coord of top left corner of waypoint selector
    Ww = 300,  // width of waypoint selector
    Wh =  35;  // height of waypoint selector

  private boolean
    WptsInstd = false;  // waypoints not yet installed

  private String
    WptNames[];  // upto 1000 waypoints provided for


  selwp(movmap mm, Container cp, msgpanel mp, butpanel bp) {
    this.mm = mm;  // local variable for object reference to main applet
    this.mp = mp;  // message panel reference
    this.bp = bp;  // reference to the button panel object
    ws = this;     // set reference to route selector object

    /* Create waypoint selector choice menu, add it to the
    applet's content pane, then set its position and size. */

    waypoints = new JComboBox<String>();
    cp.add(waypoints);
    waypoints.setBounds(Wx,Wy,Ww,Wh);

    // create and register an event listener for this choice menu
    waypoints.addItemListener(new wslisten(wslisten.WAYPOINT, this));
  }


  void setAirmap(airmap am) {this.am = am;}


  void setNavpanel(navpanel np) {this.np = np;}


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


  void clearWaypoints(int x) {  /* x is the number of waypoints
                                   in the selected route */
    WptNames = new String[x];   /* create a string array to
                                   hold the waypoint names */
    wn = 0;  // set its access index to point to the first name
  }


  void addWaypoint(String s) { WptNames[wn++] = s; }


  // copy route names from array RouteNames[] to Choice Menu
  void installWaypoints() {
    WptsInstd = 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() {
    waypoints.removeAllItems();
    for(int i = 0; i < wn; i++)
      waypoints.addItem(WptNames[i]);
    waypoints.setSelectedIndex(0);
    WptsInstd = true;
  }


  void waypointSelect() {  // A ROUTE HAS JUST BEEN SELECTED

    /* NOTE: the following two boolean conditions are set
    on different threads. That's why both are necessary. */

    if(ld.DefaultsLoaded() && WptsInstd) {
      bp.pause();  // pause flight by killing RunFlag in butpanel
      bp.Relabel(false);  // set label of start button
      mp.showMsg("Flight paused.",true,false);
      route.getCurrent().setThis(waypoints.getSelectedIndex());
      am.atualizar();  // update the air map
      np.atualizar();  // update the nav info panel
    }
  }
}



// LISTENS FOR EVENTS FROM THE CHOICE MENU SELECTORS
class wslisten implements ItemListener {
  static final int WAYPOINT = 0;  // an event from the 'Stations' Choice Menu

  int id;    // one of the above events
  selwp ws;  // the application that called: always the above applet!

  // constructor for a new Choice selection event
  public wslisten(int id, selwp ws) {
    this.id = id;  //set the id number for this instance of 'rslisten'
    this.ws = ws;  //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) {
    switch(id) {
      // Execute the method in the above applet
      case WAYPOINT: ws.waypointSelect(); break;
    }
  }
}