tools/dom/templates/html/impl/impl_Geolocation.darttemplate

// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

part of $LIBRARYNAME;

$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {

  Future<Geoposition> getCurrentPosition({bool$NULLABLE enableHighAccuracy,
      Duration$NULLABLE timeout, Duration$NULLABLE maximumAge}) {
    var options = {};
    if (enableHighAccuracy != null) {
      options['enableHighAccuracy'] = enableHighAccuracy;
    }
    if (timeout != null) {
      options['timeout'] = timeout.inMilliseconds;
    }
    if (maximumAge != null) {
      options['maximumAge'] = maximumAge.inMilliseconds;
    }
    var completer = new Completer<Geoposition>();
    try {
      _getCurrentPosition(
          (position) {
            completer.complete(_ensurePosition(position));
          },
          (error) {
            completer.completeError(error);
          },
          options);
    } catch (e, stacktrace) {
      completer.completeError(e, stacktrace);
    }
    return completer.future;
  }

  Stream<Geoposition> watchPosition({bool$NULLABLE enableHighAccuracy,
      Duration$NULLABLE timeout, Duration$NULLABLE maximumAge}) {

    var options = {};
    if (enableHighAccuracy != null) {
      options['enableHighAccuracy'] = enableHighAccuracy;
    }
    if (timeout != null) {
      options['timeout'] = timeout.inMilliseconds;
    }
    if (maximumAge != null) {
      options['maximumAge'] = maximumAge.inMilliseconds;
    }

    int watchId;
    // TODO(jacobr): it seems like a bug that we have to specifiy the static
    // type here for controller.stream to have the right type.
    // dartbug.com/26278
    StreamController<Geoposition> controller;
    controller = new StreamController<Geoposition>(sync: true,
      onListen: () {
        assert(watchId == null);
        watchId = _watchPosition(
            (position) {
              controller.add(_ensurePosition(position));
            },
            (error) {
              controller.addError(error);
            },
            options);
      },
      onCancel: () {
        assert(watchId != null);
        _clearWatch(watchId);
      });

    return controller.stream;
  }

  Geoposition _ensurePosition(domPosition) {
    try {
      // Firefox may throw on this.
      if (domPosition is Geoposition) {
        return domPosition;
      }
    } catch(e) {}
    return new _GeopositionWrapper(domPosition);
  }

$!MEMBERS}

/**
 * Wrapper for Firefox- it returns an object which we cannot map correctly.
 * Basically Firefox was returning a [xpconnect wrapped nsIDOMGeoPosition] but
 * which has further oddities.
 */
class _GeopositionWrapper implements Geoposition {
  var _ptr;
  _GeopositionWrapper(this._ptr);

  Coordinates get coords => JS('Coordinates', '#.coords', _ptr);
  int get timestamp => JS('int', '#.timestamp', _ptr);
}