Very rudimentary Unity VR SDK HMD Event notification junk

VRManager.cs

// DISCLAIMER: This was written late at night and is probably garbage.
// LICENSE: Do whatever you want with it. No attribution needed, but don't blame me if it doesn't work.

using UnityEngine;
using UnityEngine.XR;

public class VRManager : MonoBehaviour
{
	public delegate void VRManagerEventHandler();
	public static event VRManagerEventHandler LostFocus;
	public static event VRManagerEventHandler ResumedFocus;

	private bool hadFocus = true;
	private VRSDK sdk = VRSDK.None;

	protected virtual void OnLostFocus()
	{
Debug.Log("VR DEVICE LOST FOCUS!");
		if (LostFocus != null)
			LostFocus();
	}

	protected virtual void OnResumedFocus()
	{
Debug.Log("VR DEVICE RESUMED FOCUS!");
		if (ResumedFocus != null)
			ResumedFocus();
	}

	private void Awake()
	{
		// If we aren't using VR, turn all this off. It isn't needed
		if (!XRSettings.enabled)
			gameObject.SetActive(false);

		hadFocus = true;
		sdk = VRSDK.None;

		if (XRSettings.loadedDeviceName == "Oculus")
			sdk = VRSDK.Oculus;
		else if (XRSettings.loadedDeviceName == "OpenVR")
			sdk = VRSDK.SteamVR;
	}

	private void LateUpdate()
	{
		if (hadFocus)
		{
			// For Oculus HMDs, we need to detect headset removals or menu presses, and fire accordingly
			if (sdk == VRSDK.Oculus)
			{
				if (!OVRManager.hasInputFocus || !OVRManager.hasVrFocus || XRDevice.userPresence == UserPresenceState.NotPresent)
					hadFocus = false;
			}
			else // if (sdk == VRSDK.SteamVR) I don't know if there are SteamVR equivilents, so just stick w/ the generic Unity one?
			{
				if (XRDevice.userPresence == UserPresenceState.NotPresent)
					hadFocus = false;
			}

			// If we just lost focus this frame, send a message
			if (!hadFocus)
				OnLostFocus();
		}
		else
		{
			// For Oculus HMDs, we need to detect headset removals or menu presses, and fire accordingly
			if (sdk == VRSDK.Oculus)
			{
				if (OVRManager.hasInputFocus && OVRManager.hasVrFocus && XRDevice.userPresence != UserPresenceState.NotPresent)
					hadFocus = true;
			}
			else // if (sdk == VRSDK.SteamVR) I don't know if there are SteamVR equivilents, so just stick w/ the generic Unity one?
			{
				if (XRDevice.userPresence != UserPresenceState.NotPresent)
					hadFocus = true;
			}

			// If we just lost focus this frame, send a message
			if (hadFocus)
				OnResumedFocus();
		}
	}

	public VRSDK GetSDK()
	{
		return sdk;
	}
}

// WMR is using SteamVR so I don't care about anything else for now
public enum VRSDK
{
	None,
	Oculus,
	SteamVR
}