/// <summary>
/// Checks an Input Event for any significant changes that would be considered user activity.
/// </summary>
/// <param name="inputEvent">The input event being checked for changes</param>
/// <param name="device">The input device being checked against </param>
/// <param name="offset">The offset into the device that the event is placed</param>
/// <param name="sizeInBytes">The size of the event in bytes</param>
/// <returns>True if any changes exist in the event once the device has been filtered through for noise and non-significant changes. False otherwise.</returns>
public unsafe bool EventHasValidData(InputDevice device, InputEventPtr inputEvent, uint offset, uint sizeInBytes)
{
if (!inputEvent.valid)
{
throw new ArgumentException("Invalid or unset event being checked.", "inputEvent");
}
if (device == null)
{
throw new ArgumentNullException("device");
}
if (IsEmpty())
{
return(true);
}
if ((offset + sizeInBytes) * 8 > device.stateBlock.sizeInBits)
{
return(false);
}
var noiseFilterPtr = InputStateBuffers.s_NoiseBitmaskBuffer;
if (noiseFilterPtr == IntPtr.Zero)
{
throw new Exception("Noise Filter Buffer is uninitialized while trying to check state events for data.");
}
var ptrToEventState = IntPtr.Zero;
if (inputEvent.IsA <StateEvent>())
{
var stateEvent = StateEvent.From(inputEvent);
ptrToEventState = stateEvent->state;
}
else if (inputEvent.IsA <DeltaStateEvent>())
{
var stateEvent = DeltaStateEvent.From(inputEvent);
ptrToEventState = stateEvent->deltaState;
}
else
{
throw new ArgumentException(string.Format(
"Invalid event type '{0}', we can only check for valid data on StateEvents and DeltaStateEvents.",
inputEvent.type),
"inputEvent");
}
if (MemoryHelpers.HasAnyNonZeroBitsAfterMaskingWithBuffer(ptrToEventState, noiseFilterPtr, offset, sizeInBytes * 8))
{
return(true);
}
for (var i = 0; i < elements.Length; i++)
{
if (elements[i].EventHasValidData(inputEvent, device))
{
return(true);
}
}
return(false);
}