/** 
  * 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 movmap mm;        // object reference to the main applet
  private msgpanel mp;      // object reference to message panel
  private int 
    wn = 0,                // waypoint number
    Wx = 305, Wy = 380,    // top left corner of waypoint selector
    Ww = 300, Wh =  35;    // width and height of waypoint selector

  // reference for this checkbox group
  private JComboBox<String> waypoints;
  private boolean WaypointsInstalled = false;
  private String WaypointNames[];  // provides for upto 1000 waypoints


  // construct the radio button panel
  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, 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;}

  /* 'x' is the number of waypoints in the selected route.
  Create a string array to hold the waypoint names then set
  its access index to point to the first name. */

  void clearWaypoints(int x) {
    WaypointNames = new String[x];
    wn = 0;
  }

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

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

  void waypointSelect() {     // A ROUTE HAS JUST BEEN SELECTED
    if(ld.DefaultsLoaded()    // These two boolean conditions are set on diff-
    && WaypointsInstalled) {  // erent threads. That's why both are necessary.
      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 information 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 class 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 method in the above applet
    switch(id) { case WAYPOINT: ws.waypointSelect(); }
  }
}