/// <summary>
/// Attempts the start the geowatcher.
/// </summary>
private void TryStartGps()
{
bool permission = true;
if (GeoPositionWatcher is GeoCoordinateWatcher)
{
permission = (GeoPositionWatcher as GeoCoordinateWatcher).Permission != GeoPositionPermission.Denied;
}
#if WINDOWS_PHONE
if (permission && Visible && Map != null && IsEnabled && GeoPositionWatcher != null)
{
GeoPositionWatcher.Start(true); //TryStart's behavior is not consistent across WP OS versions
}
if (GeoPositionWatcher != null && GeoPositionWatcher.Position != null &&
GeoPositionWatcher.Position.Location != null && !GeoPositionWatcher.Position.Location.IsUnknown)
{
UpdatePosition(GeoPositionWatcher.Position);
}
#else
bool result = false;
if (permission && Visible && Map != null && IsEnabled && GeoPositionWatcher != null)
{
result = GeoPositionWatcher.TryStart(true, TimeSpan.FromSeconds(10));
}
if (result && GeoPositionWatcher != null && GeoPositionWatcher.Position != null &&
GeoPositionWatcher.Position.Location != null && !GeoPositionWatcher.Position.Location.IsUnknown)
{
UpdatePosition(GeoPositionWatcher.Position);
}
#endif
}
/// <summary>
/// Override to know when a layer's <see cref="Map"/> property changes.
/// </summary>
/// <param name="oldValue">Old map</param>
/// <param name="newValue">New map</param>
protected override void OnMapChanged(Map oldValue, Map newValue)
{
base.OnMapChanged(oldValue, newValue);
if (oldValue != null)
{
oldValue.PropertyChanged -= map_PropertyChanged;
}
if (newValue != null)
{
newValue.PropertyChanged += map_PropertyChanged;
if (GeoPositionWatcher != null)
{
TryStartGps();
}
}
else if (GeoPositionWatcher != null)
{
GeoPositionWatcher.Stop();
}
}
