Simpler Vuforia Event Handling using Unity Events

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.Events;

using Vuforia;



    public class EasyEventHandler : MonoBehaviour, ITrackableEventHandler

    {



    public UnityEvent onMarkerFound;

    public UnityEvent onMarkerLost;



        protected TrackableBehaviour mTrackableBehaviour;

        protected TrackableBehaviour.Status m_PreviousStatus;

        protected TrackableBehaviour.Status m_NewStatus;







        protected virtual void Start()

        {

            mTrackableBehaviour = GetComponent<TrackableBehaviour>();

            if (mTrackableBehaviour)

                mTrackableBehaviour.RegisterTrackableEventHandler(this);

        }



        protected virtual void OnDestroy()

        {

            if (mTrackableBehaviour)

                mTrackableBehaviour.UnregisterTrackableEventHandler(this);

        }





        public void OnTrackableStateChanged(

            TrackableBehaviour.Status previousStatus,

            TrackableBehaviour.Status newStatus)

        {

            m_PreviousStatus = previousStatus;

            m_NewStatus = newStatus;



            if (newStatus == TrackableBehaviour.Status.DETECTED ||

                newStatus == TrackableBehaviour.Status.TRACKED ||

                newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)

            {

                onMarkerFound.Invoke();

            }

            else if (previousStatus == TrackableBehaviour.Status.TRACKED &&

                     newStatus == TrackableBehaviour.Status.NO_POSE)

            {




                onMarkerLost.Invoke();

            }

            else

            {

            // For combo of previousStatus=UNKNOWN + newStatus=UNKNOWN|NOT_FOUND

            // Vuforia is starting, but tracking has not been lost or found yet

            // Call OnTrackingLost() to hide the augmentations

            onMarkerLost.Invoke();

            }

        }

    }

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