/// <summary>
/// Register's a target and its events for the aggregated events issued by TrackerKeeper.
/// </summary>
/// <param name="target">Target.</param>
public AbstractTrackableFoundEventHandler Register(AbstractTrackableFoundEventHandler target)
{
if (targets?.Contains(target) == false)
{
targets.Add(target);
target.onFound.AddListener(TargetFinder(target));
target.onLost.AddListener(TargetLoser(target));
target.onProximity.AddListener(TargetProximity(target));
target.onSafe.AddListener(TargetSafe(target));
}
return(target);
}
/// <summary>
/// Creates an event handler that can handle losing a given target. The event handler will
/// fire the targetChanged event if the lost target was the <see cref="CurrentTarget"/>. If
/// losing this target means that there are no tracked targets, then the <see
/// cref="onAllTargetsLost"/> event is fired. Finally, Vuforia's Persistent Extended Tracking
/// is reset, if it was active.
/// </summary>
/// <returns>The loser.</returns>
/// <param name="target">Target.</param>
private UnityAction TargetLoser(AbstractTrackableFoundEventHandler target)
{
return(() =>
{
onTargetLost?.Invoke(target.transform);
if (!HasTargets && hadAnyTargets)
{
hadAnyTargets = HasTargets;
if (!done)
{
Invoke(nameof(OnAllTargetsLost), 1);
}
}
});
}
/// <summary>
/// Creates an event handler that can handle finding a given target.
/// </summary>
/// <returns>The finder.</returns>
/// <param name="target">Target.</param>
private UnityAction TargetFinder(AbstractTrackableFoundEventHandler target)
{
return(() =>
{
CancelInvoke(nameof(OnAllTargetsLost));
if (HasTargets && !hadAnyTargets && Tracking)
{
onAnyTargetFound?.Invoke();
}
onTargetFound?.Invoke(target.transform);
foreach (var otherTarget in targets)
{
if (otherTarget != target && otherTarget.Found)
{
otherTarget.ForceLost();
}
}
hadAnyTargets = HasTargets;
});
}
/// <summary>
/// Initializes a new instance of the <see cref="T:Juniper.XR.TrackingStateChangeEventArgs"/> class.
/// </summary>
/// <param name="src"> Source.</param>
/// <param name="tracking">If set to <c>true</c> tracking.</param>
public TrackingStateChangeEventArgs(AbstractTrackableFoundEventHandler src, bool tracking)
{
Source = src;
Tracking = tracking;
}
/// <summary>
/// Creates an event handler that can handle finding a given target.
/// </summary>
/// <returns>The finder.</returns>
/// <param name="target">Target.</param>
private UnityAction TargetSafe(AbstractTrackableFoundEventHandler target)
{
return(() => onTargetSafe.Invoke(target.transform));
}