private static void TryInitializeHingeAngleSensor(HingeAngleSensor owner)
{
if (_hingeAngleSensor != null)
{
return;
}
lock (_syncLock)
{
if (_hingeAngleSensor == null && !ApiExtensibility.CreateInstance(owner, out _hingeAngleSensor))
{
owner.Log().Warn("You need to reference Uno.UI.DualScreen NuGet package from your project to use this feature.");
}
}
}
public static IAsyncOperation <HingeAngleSensor> GetDefaultAsync()
{
// avoid locking if possible
if (!_initializationAttempted)
{
lock (_syncLock)
{
if (!_initializationAttempted) //double-check for race conditions
{
// we need to create a dummy instance to give IUnoHingeAngleSensor an owner
var sensor = new HingeAngleSensor();
TryInitializeHingeAngleSensor(sensor);
if (_hingeAngleSensor?.DeviceHasHinge == true)
{
_instance = sensor;
}
_initializationAttempted = true;
}
}
}
return(Task.FromResult(_instance).AsAsyncOperation());
}
async void ProcessHingeAngleSubscriberCount(int newCount)
{
try
{
if (_angleSensor == null)
{
_angleSensor = await Windows.Devices.Sensors.HingeAngleSensor.GetDefaultAsync();
}
if (_angleSensor == null)
{
return;
}
lock (hingeAngleLock)
{
if (newCount == 1)
{
_angleSensor.ReadingChanged += OnReadingChanged;
}
else if (newCount == 0)
{
_angleSensor.ReadingChanged -= OnReadingChanged;
}
}
}
catch (Exception e)
{
Internals.Log.Warning(nameof(DualScreenInfo), $"Failed to retrieve Hinge Angle Sensor {e}");
}
void OnReadingChanged(HingeAngleSensor sender, HingeAngleSensorReadingChangedEventArgs args)
{
Device.BeginInvokeOnMainThread(() =>
{
_hingeAngleChanged?.Invoke(this, new HingeAngleChangedEventArgs(args.Reading.AngleInDegrees));
});
}
}
