/// <summary>
/// keyboard = event0, mouse = /dev/input/mice
/// should not have to open all of them
/// https://thehackerdiary.wordpress.com/2017/04/21/exploring-devinput-1/
/// </summary>
public static async Task Watch(string inputEvent, Action <MouseInputEventData> callback, CancellationToken token)
{
TaskCompletionSource <bool> cancellationCompletionSource = new TaskCompletionSource <bool>();
using (FileStream stream = new FileStream(Path.Combine(KeyboardDevPath, inputEvent), FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 4096, true))
using (token.Register(() => cancellationCompletionSource.TrySetResult(true)))
{
while (!token.IsCancellationRequested)
{
int read = 0;
byte[] keyBuffer = new byte[MouseInputEventData.Size];
while (read < MouseInputEventData.Size && !token.IsCancellationRequested)
{
Task <int> readTask = stream.ReadAsync(keyBuffer, 0, MouseInputEventData.Size - read, token);
if (readTask != await Task.WhenAny(readTask, cancellationCompletionSource.Task))
{
throw new OperationCanceledException(token);
}
if (readTask.Exception?.InnerException != null)
{
throw readTask.Exception.InnerException;
}
read += readTask.Result;
}
// 40, 24, 56
MouseInputEventData eventData = new MouseInputEventData
{
Button = (MouseButton)(keyBuffer[0] == 40 || keyBuffer[0] == 24 || keyBuffer[0] == 56 ? 8 : keyBuffer[0]),
Position = new Vector2((sbyte)keyBuffer[1], (sbyte)-keyBuffer[2])
};
callback(eventData);
}
}
}
private void OnWatchTaskEventCallback(MouseInputEventData eventData) => OnMouseInputData?.Invoke(this, eventData);
private static void InternalMouseInputEvent(object sender, MouseInputEventData eventData)
{
CursorPosition = Vector2.Clamp(CursorPosition + eventData.Position, Vector2.Zero, CursorBounds);
OnMouseInputEvent?.Invoke(sender, eventData);
}