fgdata/gui/dialogs/airports.xml

<?xml version="1.0"?>

<PropertyList>
  <name>airports</name>
  <layout>vbox</layout>
  <resizable>true</resizable>
  <default-padding>3</default-padding>

  <group>
    <layout>hbox</layout>
    <default-padding>1</default-padding>

	  <empty><stretch>1</stretch></empty>

    <text>
      <label>Select an Airport</label>
    </text>

	  <empty><stretch>1</stretch></empty>

    <button>
      <pref-width>16</pref-width>
      <pref-height>16</pref-height>
      <legend></legend>
      <keynum>27</keynum>
      <border>2</border>
      <binding>
        <command>dialog-close</command>
      </binding>
      <binding>
        <command>property-toggle</command>
        <property>/sim/gui/dialogs/airports/signals/dialog-close</property>
      </binding>
    </button>
  </group>

  <hrule/>

  <nasal>
    <!-- Generalize all this, turn into helpers and load defaults via XML -->
    <open><![CDATA[
      var update_info = func(open = 0) {
          var info = airportinfo(airport_id);
          setprop("/sim/gui/dialogs/airports/selected-airport/id", airport_id);
          setprop("/sim/gui/dialogs/airports/selected-airport/name", info.name);
          setprop("/sim/gui/dialogs/airports/selected-airport/location", sprintf("%.3f / %.3f", info.lat, info.lon));
          setprop("/sim/gui/dialogs/airports/selected-airport/lon", info.lon);
          setprop("/sim/gui/dialogs/airports/selected-airport/lat", info.lat);
          setprop("/sim/gui/dialogs/airports/selected-airport/elevation-ft", 3.28 * info.elevation);
          setprop("/sim/gui/dialogs/airports/selected-airport/rwy", "");
          setprop("/sim/gui/dialogs/airports/selected-airport/parkpos", "");
          if (!open) {
            AirportChart.getController().setPosition(info.lat, info.lon);
          }

          if (info.has_metar) {
            # Retrieve an updated METAR, and indicate that we've not got one currently.
            fgcommand("request-metar", var n = props.Node.new({ "path": "/sim/gui/dialogs/airports/selected-airport/metar",
                                                         "station": airport_id}));
          } else {
            # This airport has no METAR. Rather than cancelling the retrieve-metar command, simply set the TTL
            # to a very long time so it won't over-ride our message.
            setprop("/sim/gui/dialogs/airports/selected-airport/metar/time-to-live", 9999);
          }


          # Display the comms frequencies for this airport
          var fcount = 0;

          if (size(info.comms()) > 0) {
            # Airport has one or more frequencies assigned to it.
            var freqs = {};
            var comms = info.comms();

            foreach (var c; comms) {
              var f = sprintf("%.3f", c.frequency);
              if (freqs[c.ident] == nil) {
                freqs[c.ident] = f;
              } else {
                freqs[c.ident] = freqs[c.ident] ~ " " ~ f;
              }
            }

            foreach (var c; sort(keys(freqs), string.icmp)) {
              setprop("sim/gui/dialogs/airports/selected-airport/comms/freq[" ~ fcount ~ "]/label", c);
              setprop("sim/gui/dialogs/airports/selected-airport/comms/freq[" ~ fcount ~ "]/value", freqs[c]);
              fcount += 1;
            }
          }

          while (fcount < 13) {
            # zero remaining comms channels
            setprop("sim/gui/dialogs/airports/selected-airport/comms/freq[" ~ fcount ~ "]/label", "");
            setprop("sim/gui/dialogs/airports/selected-airport/comms/freq[" ~ fcount ~ "]/value", "");
            fcount += 1;
          }

          var longest_runway = 0;
          var runways = info.runways;
          var infoAboutRunways = [];   # list of strings for display

          avail_runways.removeChildren("value");
          var runway_keys = sort(keys(runways), string.icmp);
          var i = 0;

          foreach(var rwy; runway_keys) {
              var r = runways[rwy];
              longest_runway = math.max(longest_runway, r.length * 3.28);
              avail_runways.getNode("value[" ~ i ~ "]", 1).setValue(rwy);
              var rwyInfo = sprintf("%5s %12d' / %03d deg", rwy, r.length * 3.28,
                                    r.heading);

              if (r.ils != nil) {
                  rwyInfo = sprintf("%s %20.3f Mhz", rwyInfo,
                                    r.ils.frequency / 100);
              }

              append(infoAboutRunways, rwyInfo);

              i += 1;
              if (i == MAX_RUNWAYS)
                  break;
          }

          var runwayInfoNode = dlg.getNode("selected-airport/runways-info", 1);
          runwayInfoNode.setValue(string.join("\n", infoAboutRunways));
          fgcommand("dialog-update", props.Node.new({"object-name": "runways-info", "dialog-name": "airports"}));

          # Update the list of available parking positions
          avail_parking = {"AVAILABLE":1};
          foreach (var park; info.parking()) {
              avail_parking[park.name] = 1;
          }

          setprop("/sim/gui/dialogs/airports/selected-airport/longest-runway", longest_runway);

          var airport_pos = geo.Coord.new();
          airport_pos.set_latlon(info.lat, info.lon);

          var pos = geo.aircraft_position();
          var dst = pos.distance_to(airport_pos) / 1852.0;
          var crs = pos.course_to(airport_pos);
          setprop("/sim/gui/dialogs/airports/selected-airport/distance-nm", dst);
          setprop("/sim/gui/dialogs/airports/selected-airport/course-deg", crs);

          gui.dialog_update("airports", "runway-list");
      }

      var MAX_RUNWAYS = 28; # number of entries at KEDW

      var DIALOG = cmdarg();
      var listeners = [];

      ## "prologue" currently required by the canvas-generic-map
       var dialog_name ="airports"; #TODO: use substr() and cmdarg() to get this dynamically
       var dialog_property = func(p) return "/sim/gui/dialogs/airports/"~p; #TODO: generalize using cmdarg
       var DIALOG_CANVAS = gui.findElementByName(DIALOG, "airport-selection");

      var displayMode = getprop("/sim/gui/dialogs/airports/display-mode");
      if ((displayMode != 0) and (displayMode != 1)) {
        setprop("/sim/gui/dialogs/airports/display-mode", 0);
      }

      var displayTaxiways = getprop("/sim/gui/dialogs/airports/display-taxiways");
      if ((displayTaxiways != 0) and (displayTaxiways != 1)) {
        setprop("/sim/gui/dialogs/airports/display-taxiways", 1);
      }

      var displayParking = getprop("/sim/gui/dialogs/airports/display-parking");
      if ((displayParking != 0) and (displayParking != 1)) {
        setprop("/sim/gui/dialogs/airports/display-parking", 0);
      }

      var displayTower = getprop("/sim/gui/dialogs/airports/display-tower");
      if ((displayTower != 0) and (displayTower != 1)) {
        setprop("/sim/gui/dialogs/airports/display-tower", 1);
      }

      var showHelipads = getprop("/sim/gui/dialogs/airports/show-helipads");
      if ((showHelipads != 0) and (showHelipads != 1)) {
        setprop("/sim/gui/dialogs/airports/show-helipads", 0);
      }

      var dlg = props.globals.getNode("/sim/gui/dialogs/airports", 1);
      var avail_runways = dlg.getNode("available-runways", 1);
      var avail_parking = {};

      # Start with the closest airport
      var airport_id = airportinfo().id;
      update_info(open = 1);

      # Retrieve METAR
      fgcommand("request-metar", var n = props.Node.new({ "path": "/sim/gui/dialogs/airports/selected-airport/metar",
                                                         "station": airport_id}));

      dlg.getNode("list", 1).setValue("");

      var airportlist = dlg.getNode("list");

      var mode = {
        runway:     dlg.getNode("use_runway", 1),
        bestrunway: dlg.getNode("use_best_runway", 1),
        parkpos:    dlg.getNode("use_parkpos", 1)
      };

      var set_radio = func(m) {
        foreach (k; keys(mode)) {
          mode[k].setBoolValue(m == k);
        }
      }

      var initialized = 0;
      foreach (k; keys(mode)) {
        if (mode[k].getType() == "NONE" or initialized) {
          mode[k].setBoolValue(0);
        } else {
          initialized += mode[k].getBoolValue();
        }
      }
      if (!initialized) {
        set_radio("bestrunway");
      }

      var listbox = func {
          airport_id = pop(split(" ", airportlist.getValue()));
          airport_id = substr(airport_id, 1, size(airport_id) - 2);  # strip parentheses

          update_info();
      }

      var apply = func {
          setprop("/sim/presets/airport-id", airport_id);
          setprop("/sim/presets/longitude-deg", -9999);
          setprop("/sim/presets/latitude-deg", -9999);
          setprop("/sim/presets/altitude-ft", -9999);
          setprop("/sim/presets/airspeed-kt", 0);
          setprop("/sim/presets/offset-distance-nm", 0);
          setprop("/sim/presets/offset-azimuth-deg", 0);
          setprop("/sim/presets/glideslope-deg", 0);
          setprop("/sim/presets/heading-deg", 9999.0);

          if (mode["bestrunway"].getBoolValue()) {
            setprop("/sim/presets/runway", "");
            setprop("/sim/presets/parkpos", "");
            setprop("/sim/presets/runway-requested", 0);
          } else if (mode["runway"].getBoolValue()) {
            setprop("/sim/presets/runway", getprop("/sim/gui/dialogs/airports/selected-airport/rwy"));
            setprop("/sim/presets/parkpos", "");
            setprop("/sim/presets/runway-requested", 1);
          } else {
            setprop("/sim/presets/runway", "");
            setprop("/sim/presets/parkpos", getprop("/sim/gui/dialogs/airports/selected-airport/parkpos"));
          }
      }

      canvas.register_callback(update_info); # FIXME: this is a workaround to run dialog-specific code in the canvas block
      ]]>
    </open>
    <close><![CDATA[
	fgcommand("clear-metar", var n = props.Node.new({ "path": "/sim/gui/dialogs/airports/selected-airport/metar",
                                                             "station": airport_id}));
        #map.cleanup_listeners(); #TODO: We should be setting a signal when closing the dialog, so that cleanup code can be invoked automatically
        AirportChart.del();
        foreach (var l; listeners)
            removelistener(l);
        setsize(listeners, 0);
      ]]></close>
  </nasal>

  <group>
    <layout>hbox</layout>
    <default-padding>4</default-padding>
    <halign>fill</halign>
    <stretch>true</stretch>

    <group>
      <layout>vbox</layout>
      <valign>top</valign>
      <stretch>true</stretch>

      <group>
        <layout>hbox</layout>
        <default-padding>4</default-padding>

        <text>
          <label>Airport:</label>
        </text>

        <input>
          <name>input</name>
          <pref-width>120</pref-width>
          <halign>fill</halign>
          <stretch>true</stretch>
          <property>/sim/gui/dialogs/airports/list</property>
          <binding>
            <command>dialog-apply</command>
            <object-name>input</object-name>
          </binding>
        </input>

<!--

        <button>
          <legend>Clear</legend>
          <binding>
            <command>property-assign</command>
            <property>/sim/gui/dialogs/airports/mode</property>
            <value>search</value>
          </binding>
          <binding>
            <command>property-assign</command>
            <property>/sim/gui/dialogs/airports/list</property>
            <value></value>
          </binding>
          <binding>
            <command>dialog-update</command>
            <object-name>input</object-name>
          </binding>
          <binding>
            <command>dialog-update</command>
            <object-name>airport-list</object-name>
          </binding>
        </button>
-->
        <button>
          <legend>Search</legend>
          <default>true</default>
          <binding>
            <command>property-assign</command>
            <property>/sim/gui/dialogs/airports/mode</property>
            <value>search</value>
          </binding>
          <binding>
            <command>dialog-apply</command>
            <object-name>input</object-name>
          </binding>
          <binding>
            <command>nasal</command>
            <script>
              var apt_type = "airport:";
              var heli_type = "heliport:";
              var search_term = getprop("/sim/gui/dialogs/airports/list");

              # strip off airport type prefix
              if (string.match(search_term,heli_type)) {
                search_term = string.substr(search_term,size(heli_type));
              }
              else if (string.match(search_term,apt_type)) {
                search_term = string.substr(search_term,size(apt_type));
              }
              var new_value = "";

              # add new airport type prefix based off helipad checkbox
              if (getprop("/sim/gui/dialogs/airports/show-helipads")) {
                new_value = heli_type ~ search_term;
              }
              else {
                new_value = apt_type ~ search_term;
              }
              setprop("/sim/gui/dialogs/airports/list", new_value);
            </script>
          </binding>
          <binding>
            <command>dialog-update</command>
            <object-name>airport-list</object-name>
          </binding>
        </button>

        <button>
          <legend>&lt;100nm</legend>
          <binding>
            <command>property-assign</command>
            <property>/sim/gui/dialogs/airports/mode</property>
            <value>100nm</value>
          </binding>
          <binding>
            <command>nasal</command>
            <script>
              # change airport type to heliport if checkbox is set
              var apt_type = "airport";
              if (getprop("/sim/gui/dialogs/airports/show-helipads")) {
                 apt_type = "heliport";
              }
              var airports = findAirportsWithinRange(100,apt_type);

              var list = dlg.getNode("close-airports", 1);

              list.removeChildren("value");

              forindex (var idx; airports) {
                list.getNode("value["~ idx ~ "]", 1).setValue(airports[idx].name ~ "  (" ~ airports[idx].id ~ ")");
              }
            </script>
          </binding>
          <binding>
            <command>dialog-update</command>
            <object-name>close-airport-list</object-name>
          </binding>
        </button>

        <checkbox>
          <name>show-helipads</name>
          <label>Helipads</label>
          <property>/sim/gui/dialogs/airports/show-helipads</property>
          <binding>
            <command>dialog-apply</command>
            <object-name>show-helipads</object-name>
          </binding>
        </checkbox>

      </group>

      <group>
        <layout>table</layout>
        <default-padding>0</default-padding>

        <list>
          <row>0</row><col>0</col>
          <visible>
            <equals>
              <property>/sim/gui/dialogs/airports/mode</property>
              <value>100nm</value>
            </equals>
          </visible>
          <name>close-airport-list</name>
          <pref-width>260</pref-width>
          <pref-height>260</pref-height>
          <halign>fill</halign>
          <valign>fill</valign>
          <stretch>true</stretch>
          <property>/sim/gui/dialogs/airports/list</property>
          <properties>/sim/gui/dialogs/airports/close-airports</properties>
          <binding>
            <command>dialog-apply</command>
            <object-name>close-airport-list</object-name>
          </binding>
          <binding>
            <command>nasal</command>
            <script>listbox()</script>
          </binding>
        </list>

        <airport-list>
          <row>0</row><col>0</col>
          <visible>
            <equals>
              <property>/sim/gui/dialogs/airports/mode</property>
              <value>search</value>
            </equals>
          </visible>
          <name>airport-list</name>
          <pref-width>260</pref-width>
          <pref-height>220</pref-height>
          <halign>fill</halign>
          <valign>fill</valign>
          <stretch>true</stretch>
          <property>/sim/gui/dialogs/airports/list</property>
          <binding>
            <command>dialog-apply</command>
            <object-name>airport-list</object-name>
          </binding>
          <binding>
            <command>nasal</command>
            <script>listbox()</script>
          </binding>
        </airport-list>

      </group>

      <group>
        <layout>hbox</layout>
        <halign>fill</halign>
        <text>
          <label>METAR</label>
        </text>

        <hrule><stretch>1</stretch></hrule>
      </group>

      <textbox>
        <name>metar</name>
        <halign>fill</halign>
        <stretch>true</stretch>
        <pref-width>260</pref-width>
        <pref-height>70</pref-height>
        <slider>15</slider>
        <editable>false</editable>
        <wrap>true</wrap>
        <live>true</live>
        <property>/sim/gui/dialogs/airports/selected-airport/metar/data</property>
      </textbox>

      <group>
        <layout>vbox</layout>
        <valign>top</valign>

        <group>
          <layout>hbox</layout>
          <halign>fill</halign>
          <row>0</row>
          <col>0</col>
          <colspan>2</colspan>

          <text>
            <label>Aircraft Position</label>
          </text>

          <hrule><stretch>1</stretch></hrule>
        </group>

        <group>
          <layout>table</layout>
          <halign>center</halign>

          <radio>
            <row>2</row><col>0</col>
            <property>/sim/gui/dialogs/airports/use_best_runway</property>
            <live>true</live>
            <binding>
              <command>nasal</command>
              <script>set_radio("bestrunway")</script>
            </binding>
          </radio>

          <text>
            <row>2</row><col>1</col>
            <halign>right</halign>
            <label>Best runway</label>
            <enable>
              <property>/sim/gui/dialogs/airports/use_best_runway</property>
            </enable>
          </text>
          <text>
            <row>2</row><col>2</col>
            <halign>right</halign>
            <label>(based on wind)</label>
            <enable>
              <property>/sim/gui/dialogs/airports/use_best_runway</property>
            </enable>
          </text>

          <radio>
            <row>3</row><col>0</col>
            <property>/sim/gui/dialogs/airports/use_runway</property>
            <live>true</live>
            <binding>
              <command>nasal</command>
              <script>set_radio("runway")</script>
            </binding>
          </radio>

          <text>
            <row>3</row><col>1</col>
            <halign>right</halign>
            <label>Runway:</label>
            <enable>
              <property>/sim/gui/dialogs/airports/use_runway</property>
            </enable>
          </text>

          <combo>
            <name>runway-list</name>
            <row>3</row><col>2</col>
            <pref-width>85</pref-width>
            <halign>left</halign>
            <enable>
              <property>/sim/gui/dialogs/airports/use_runway</property>
            </enable>
            <property>/sim/gui/dialogs/airports/selected-airport/rwy</property>
            <editable>false</editable>
            <properties>sim/gui/dialogs/airports/available-runways</properties>
            <binding>
              <command>dialog-apply</command>
              <object-name>runway-list</object-name>
            </binding>
          </combo>

          <radio>
            <row>4</row><col>0</col>
            <property>/sim/gui/dialogs/airports/use_parkpos</property>
            <live>true</live>
            <binding>
              <command>nasal</command>
              <script>set_radio("parkpos")</script>
            </binding>
          </radio>

          <text>
            <row>4</row><col>1</col>
            <halign>right</halign>
            <label>Parking:</label>
            <enable>
              <property>/sim/gui/dialogs/airports/use_parkpos</property>
            </enable>
          </text>

          <input>
            <row>4</row><col>2</col>
            <name>parking-list</name>
            <pref-width>120</pref-width>
            <halign>fill</halign>
            <stretch>true</stretch>
            <property>/sim/gui/dialogs/airports/selected-airport/parkpos</property>
            <binding>
              <command>dialog-apply</command>
              <object-name>parking-list</object-name>
            </binding>
            <binding>
              <command>nasal</command>
              <script>
                var pos = getprop("/sim/gui/dialogs/airports/selected-airport/parkpos");
                setprop(
                  "/sim/gui/dialogs/airports/selected-airport/parkpos-invalid",
                  contains(avail_parking, pos) == 0);
              </script>
            </binding>
            <binding>
              <command>dialog-update</command>
              <object-name>parking-list-valid</object-name>
            </binding>
          </input>

          <text>
            <row>5</row><col>1</col>
            <colspan>2</colspan>
            <name>parking-list-valid</name>
            <halign>left</halign>
            <label>Parking position not found</label>
            <visible>
              <property>/sim/gui/dialogs/airports/selected-airport/parkpos-invalid</property>
            </visible>
          </text>

        </group>
      </group>

    </group>

    <vrule/>

    <group>
      <layout>vbox</layout>
      <halign>fill</halign>
      <valign>top</valign>
      <default-padding>0</default-padding>
      <stretch>true</stretch>

      <group>
        <layout>hbox</layout>
        <halign>left</halign>
        <default-padding>2</default-padding>

        <button>
          <legend>Airfield Information</legend>
          <binding>
            <command>property-assign</command>
            <property>/sim/gui/dialogs/airports/display-mode</property>
            <value>0</value>
          </binding>
        </button>

        <button>
          <legend>Airfield Chart</legend>
          <binding>
            <command>property-assign</command>
            <property>/sim/gui/dialogs/airports/display-mode</property>
            <value>1</value>
          </binding>
        </button>
      </group>

      <group>
        <layout>table</layout>
        <halign>fill</halign>
        <valign>fill</valign>
        <default-padding>0</default-padding>

        <group>
          <layout>vbox</layout>
          <valign>top</valign>
          <row>0</row>
          <col>0</col>
          <visible>
            <equals>
              <property>/sim/gui/dialogs/airports/display-mode</property>
              <value>1</value>
            </equals>
          </visible>

          <group>
            <layout>vbox</layout>

            <group>
              <layout>hbox</layout>
              <halign>fill</halign>
              <row>0</row>
              <text>
                <label>Airfield Chart</label>
              </text>

              <hrule><stretch>1</stretch></hrule>
            </group>

            <canvas>
                <name>canvas-map</name>
                <valign>fill</valign>
                <halign>fill</halign>
                <stretch>true</stretch>
                <pref-width>600</pref-width>
                <pref-height>400</pref-height>
                <nasal><load><![CDATA[
                    var myCanvas = canvas.get( cmdarg() );
                    var mapGrp = myCanvas.createGroup();
                    var AirportChart = mapGrp.createChild("map");

                    # Initialize the controller:
                    AirportChart.setController("Static position", "main");
                    var controller = AirportChart.getController();

                    # Initialize a range and screen resolution.  Setting a range
                    # to 4nm means we pick up a good set of surrounding fixes
                    # We will use the screen range for zooming.  If we use range
                    # then as we zoom in the airport center goes out of range
                    # and all the runways disappear.
                    AirportChart.setRange(4.0);
                    AirportChart.setScreenRange(500);

                    var range_step = 1.5;

                    # Center the map's origin: FIXME: move to api.nas, i.e. allow maps to have a size/view that differs from the actual canvas ??
                    AirportChart.setTranslation(
                        myCanvas.get("view[0]")/2,
                        myCanvas.get("view[1]")/2
                    );

                    ##
                    # Styling: This is a bit crude at the moment, i.e. no dedicated APIs yet - but it's
                    # just there to prototype things for now
                    var Styles = {};
                    Styles.get = func(type) return Styles[type];
                    var Options = {};
                    Options.get = func(type) return Options[type];

                    ## set up a few keys supported by the DME.symbol file to customize appearance:
                    Styles.DME = {};
                    Styles.DME.debug = 1; # HACK for benchmarking/debugging purposes
                    Styles.DME.animation_test = 0; # for prototyping animated symbols

                    Styles.DME.scale_factor = 0.4; # 40% (applied to whole group)
                    Styles.DME.line_width = 3.0;
                    Styles.DME.color_tuned = [0,1,0]; #rgb
                    Styles.DME.color_default = [1,1,0];  #rgb

                    Styles.APT = {};
                    Styles.APT.scale_factor = 0.4; # 40% (applied to whole group)
                    Styles.APT.line_width = 3.0;
                    Styles.APT.color_default = [0,0.6,0.85];  #rgb
                    Styles.APT.label_font_color = Styles.APT.color_default;
                    Styles.APT.label_font_size=28;

                    Styles.PARKING = {};
                    Styles.PARKING.scale_factor = 0.4; # 40% (applied to whole group)
                    Styles.PARKING.line_width = 3.0;
                    Styles.PARKING.color_default = [0,0.85,0.6];  #rgb
                    Styles.PARKING.label_font_color = Styles.APT.color_default;
                    Styles.PARKING.label_font_size=28;

                    Styles.FLT = {};
                    Styles.FLT.line_width = 3;

                    Styles.FIX = {};
                    Styles.FIX.color = [1,0,0];
                    Styles.FIX.scale_factor = 0.4; # 40%

                    Styles.VOR = {};
                    Styles.VOR.range_line_width = 2;
                    Styles.VOR.radial_line_width = 1;
                    Styles.VOR.scale_factor = 0.6; # 60%

                    var ToggleLayerVisible = func(name) {
                        (var l = AirportChart.getLayer(name)).setVisible(l.getVisible());
                    };
                    var SetLayerVisible = func(name,n=1) {
                        AirportChart.getLayer(name).setVisible(n);
                    };

                    Styles.APS = {};
                    Styles.APS.scale_factor = 0.25;

                    var r = func(name,vis=1,zindex=nil) return caller(0)[0];
                    # TODO: we'll need some z-indexing here, right now it's in the layer order
                    foreach(var type; [r('TAXI',1,0),r('RWY',1,1),r('TWR',1,2),r('DME',0,3),r('VOR',0,4),r('NDB',0,5),r('FIX',0,6),r('PARKING',0,7)] ) {
                        AirportChart.addLayer(factory: canvas.SymbolLayer, type_arg: type.name,
                                         visible: type.vis, priority: 4,
                                         style: Styles.get(type.name),
                                         options: Options.get(type.name) );
                        (func {
                            # Notify MapStructure about layer visibility changes:
                            var name = type.name;
                            props.globals.initNode("/sim/gui/dialogs/map-canvas/draw-"~name, type.vis, "BOOL");
                            append(listeners,
                                setlistener("/sim/gui/dialogs/map-canvas/draw-"~name,
                                    func(n) SetLayerVisible(name,n.getValue()))
                            );


                        })();
                    }

                    # Add some event listeners to handle mouse interactions
                    myCanvas.addEventListener("drag", func(e)
                    {
                      (func {
                      controller.applyOffset(-e.deltaX, -e.deltaY); })();
                    });

                    myCanvas.addEventListener("click", func(e)
                    {
                      (func {
                      controller.applyOffset(e.localX - myCanvas.get("view[0]")/2,
                                             e.localY - myCanvas.get("view[1]")/2); })();
                    });

                    myCanvas.addEventListener("wheel", func(e)
                    {
                      var range = AirportChart.getScreenRange();
                      if (e.deltaY >0) {
                        AirportChart.setScreenRange(math.min(range*range_step, 10000));
                      } else {
                        AirportChart.setScreenRange(math.max(range/range_step, 100));
                      }
                      setprop("/sim/gui/dialogs/airports/zoom-range", AirportChart.getScreenRange());
                    });

                    if ((getprop("/sim/gui/dialogs/airports/selected-airport/lat") != nil) and
                        (getprop("/sim/gui/dialogs/airports/selected-airport/lon") != nil)    )
                    {
                      # If we've got some values from a previous instantiation of the dialog
                      # then use them to display the correct position, consistent with the
                      # rest of the dialog.
                      AirportChart.getController().setPosition(
                        getprop("/sim/gui/dialogs/airports/selected-airport/lat"),
                        getprop("/sim/gui/dialogs/airports/selected-airport/lon"));
                    }
                ]]></load></nasal>
            </canvas>

            <group>
                <layout>hbox</layout>

                <checkbox>
                    <label>Nav data</label>
                    <halign>left</halign>
                    <property>/sim/gui/dialogs/map-canvas/draw-DME</property>
                    <live>true</live>
                    <binding>
                      <command>property-toggle</command>
                    </binding>
                    <binding>
                      <command>nasal</command>
                      <script>
                        var visible = ! getprop("/sim/gui/dialogs/map-canvas/draw-DME");
                        setprop("/sim/gui/dialogs/map-canvas/draw-DME", visible);
                        setprop("/sim/gui/dialogs/map-canvas/draw-VOR", visible);
                        setprop("/sim/gui/dialogs/map-canvas/draw-NDB", visible);
                        setprop("/sim/gui/dialogs/map-canvas/draw-FIX", visible);
                      </script>
                      <binding>
                        <command>dialog-apply</command>
                      </binding>
                    </binding>
                </checkbox>

                <checkbox>
                    <label>Parking</label>
                    <halign>left</halign>
                    <property>/sim/gui/dialogs/map-canvas/draw-PARKING</property>
                    <live>true</live>
                    <binding>
                      <command>dialog-apply</command>
                    </binding>
                    <binding>
                      <command>property-toggle</command>
                    </binding>
                </checkbox>

                <empty><stretch>1</stretch></empty>

                <button>
                    <name>zoomout</name>
                    <legend>+</legend>
                    <pref-width>52</pref-width>
                    <pref-height>22</pref-height>

                    <binding>
                        <command>nasal</command>
                        <script>
                            var range = AirportChart.getScreenRange();
                            AirportChart.setScreenRange(math.min(range*range_step, 10000));
                            setprop("/sim/gui/dialogs/airports/zoom-range", AirportChart.getScreenRange());
                        </script>
                    </binding>
                </button>

                <text>
                    <name>zoomdisplay</name>
                    <label>XXXXXXXXXXXX</label>
                    <format>Zoom: %d%%</format>
                    <property>/sim/gui/dialogs/airports/zoom-range</property>
                    <live>true</live>
                </text>

                <button>
                    <name>zoomin</name>
                    <legend>-</legend>
                    <pref-width>52</pref-width>
                    <pref-height>22</pref-height>

                    <binding>
                        <command>nasal</command>
                        <script>
                            var range = AirportChart.getScreenRange();
                            AirportChart.setScreenRange(math.max(range/range_step, 100));
                            setprop("/sim/gui/dialogs/airports/zoom-range", AirportChart.getScreenRange());
                        </script>
                    </binding>
                </button>
            </group>

          </group>
        </group>

        <!-- airport info  -->
        <group>
          <layout>table</layout>
          <valign>top</valign>
          <row>0</row>
          <col>0</col>
          <visible>
            <equals>
              <property>/sim/gui/dialogs/airports/display-mode</property>
              <value>0</value>
            </equals>
          </visible>

            <!-- airport info table -->
            <group>
                <row>0</row>
                <col>0</col>

              <layout>table</layout>
              <valign>top</valign>

              <group>
                <layout>hbox</layout>
                <halign>fill</halign>
                <row>0</row>
                <col>0</col>
                <colspan>2</colspan>

                <text>
                  <label>Airfield Information</label>
                </text>

                <hrule><stretch>1</stretch></hrule>
              </group>

              <text>
                <row>1</row>
                <col>0</col>
                <halign>right</halign>
                <label>Name:</label>
              </text>
              <text>
                <row>1</row>
                <col>1</col>
                <halign>left</halign>
                <live>true</live>
                <label>Athens Intl Airport Elefterios Venizel</label>
                <!--  The above airport is the longest name in Airports/apt.dat.gz as of 3 November 2012 -->
                <property>/sim/gui/dialogs/airports/selected-airport/name</property>
              </text>

              <text>
                <row>2</row>
                <col>0</col>
                <halign>right</halign>
                <label>ICAO:</label>
              </text>
              <text>
                <row>2</row>
                <col>1</col>
                <halign>left</halign>
                <live>true</live>
                <label>AAAA</label>
                <property>/sim/gui/dialogs/airports/selected-airport/id</property>
              </text>

              <text>
                <row>3</row>
                <col>0</col>
                <halign>right</halign>
                <label>Lat / Lon:</label>
              </text>
              <text>
                <row>3</row>
                <col>1</col>
                <halign>left</halign>
                <live>true</live>
                <label>XXXXXXXXXXXX</label>
                <property>/sim/gui/dialogs/airports/selected-airport/location</property>
              </text>

              <text>
                <row>4</row>
                <col>0</col>
                <halign>right</halign>
                <label>Elevation:</label>
              </text>
              <text>
                <row>4</row>
                <col>1</col>
                <halign>left</halign>
                <live>true</live>
                <format>%.0f ft</format>
                <property>/sim/gui/dialogs/airports/selected-airport/elevation-ft</property>
              </text>

              <text>
                <row>5</row>
                <col>0</col>
                <halign>right</halign>
                <label>Longest runway:</label>
              </text>
              <text>
                <row>5</row>
                <col>1</col>
                <halign>left</halign>
                <live>true</live>
                <format>%.0f ft</format>
                <property>/sim/gui/dialogs/airports/selected-airport/longest-runway</property>
              </text>

              <text>
                <row>6</row>
                <col>0</col>
                <halign>right</halign>
                <label>Distance:</label>
              </text>
              <text>
                <row>6</row>
                <col>1</col>
                <halign>left</halign>
                <live>true</live>
                <format>%.1f nm</format>
                <property>/sim/gui/dialogs/airports/selected-airport/distance-nm</property>
              </text>

              <text>
                <row>7</row>
                <col>0</col>
                <halign>right</halign>
                <label>Course:</label>
              </text>
              <text>
                <row>7</row>
                <col>1</col>
                <halign>left</halign>
                <live>true</live>
                <format>%.0f deg</format>
                <property>/sim/gui/dialogs/airports/selected-airport/course-deg</property>
              </text>
            </group>

          <!-- comms frequencies table -->
          <group>
              <row>0</row>
              <col>1</col>
            <layout>table</layout>
            <halign>fill</halign>
            <default-padding>2</default-padding>

            <group>
              <layout>hbox</layout>
              <halign>fill</halign>
              <row>0</row>
              <col>0</col>
              <colspan>2</colspan>

              <text>
                <label>Communications Frequencies</label>
              </text>

              <hrule><stretch>1</stretch></hrule>
            </group>

            <text>
              <row>1</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[0]/label</property>
            </text>

            <text>
              <row>1</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[0]/value</property>
            </text>

            <text>
              <row>2</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[1]/label</property>
            </text>

            <text>
              <row>2</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[1]/value</property>
            </text>

            <text>
              <row>3</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[2]/label</property>
            </text>

            <text>
              <row>3</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[2]/value</property>
            </text>

            <text>
              <row>4</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[3]/label</property>
            </text>

            <text>
              <row>4</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[3]/value</property>
            </text>

            <text>
              <row>5</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[4]/label</property>
            </text>

            <text>
              <row>5</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[4]/value</property>
            </text>

            <text>
              <row>6</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[5]/label</property>
            </text>

            <text>
              <row>6</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[5]/value</property>
            </text>

            <text>
              <row>7</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[6]/label</property>
            </text>

            <text>
              <row>7</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[6]/value</property>
            </text>

            <text>
              <row>8</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[7]/label</property>
            </text>

            <text>
              <row>8</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[7]/value</property>
            </text>

            <text>
              <row>9</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[8]/label</property>
            </text>

            <text>
              <row>9</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[8]/value</property>
            </text>

            <text>
              <row>10</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[9]/label</property>
            </text>

            <text>
              <row>10</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[9]/value</property>
            </text>

            <text>
              <row>11</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[10]/label</property>
            </text>

            <text>
              <row>11</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[10]/value</property>
            </text>

            <text>
              <row>12</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[11]/label</property>
            </text>

            <text>
              <row>12</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[11]/value</property>
            </text>

            <text>
              <row>13</row>
              <col>0</col>
              <halign>left</halign>
              <live>true</live>
              <label>ACTIVATE LIGHTS</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[12]/label</property>
            </text>

            <text>
              <row>13</row>
              <col>1</col>
              <halign>left</halign>
              <live>true</live>
              <label>123.456 123.456</label>
              <property>/sim/gui/dialogs/airports/selected-airport/comms/freq[12]/value</property>
            </text>

          </group>   <!-- of comm frequencies table -->


          <!-- runways table -->
          <group>
              <row>1</row>
              <col>0</col>
              <colspan>2</colspan>
            <layout>table</layout>
            <halign>fill</halign>
            <default-padding>2</default-padding>

            <group>
              <layout>hbox</layout>
              <halign>fill</halign>
              <row>0</row>
              <col>0</col>

              <text>
                <label>Runways</label>
              </text>

              <hrule><stretch>1</stretch></hrule>
            </group>

            <textbox>
              <row>1</row>
              <col>0</col>
              <name>runways-info</name>
              <object-name>runways-info</object-name>
              <halign>fill</halign>
              <stretch>true</stretch>
              <pref-width>260</pref-width>
              <pref-height>250</pref-height>
              <slider>15</slider>
              <editable>false</editable>
              <wrap>false</wrap>
              <property>/sim/gui/dialogs/airports/selected-airport/runways-info</property>
            </textbox>
          </group> <!-- of runways table -->

        </group>   <!-- of airport info outer table -->
      </group>
      </group>
    <!-- End of RH Pane -->
    </group>

    <hrule/>

    <group>
      <layout>hbox</layout>
      <default-padding>5</default-padding>

      <empty><stretch>true</stretch></empty>

      <button>
        <legend>Go To Airport</legend>
        <equal>true</equal>
        <binding>
          <command>dialog-apply</command>
          <object-name>airport-list</object-name>
        </binding>
        <binding>
          <command>nasal</command>
          <script>apply()</script>
        </binding>
        <binding>
          <command>reposition</command>
        </binding>
        <binding>
          <command>dialog-close</command>
        </binding>
      </button>

      <empty><stretch>true</stretch></empty>

      <button>
        <legend>Close</legend>
        <equal>true</equal>
        <key>Esc</key>
        <binding>
          <command>dialog-apply</command>
          <object-name>input</object-name>
        </binding>
        <binding>
          <command>dialog-close</command>
        </binding>
      </button>

      <empty><stretch>true</stretch></empty>
    </group>
  </PropertyList>