/// <summary>
/// Handles possible interactions when the subscribed cursor is within a target.
/// This includes contingencies like the gazeTarget being null, subscribing to the functions that wait
/// for a nod or dwell time and calling the DeselectHoveredObject to handle unsubscribing.
/// </summary>
/// <param name="gazeTarget"></param>
private void HandleTrackedObject(EyeGazeTarget gazeTarget)
{
if (gazeTarget == null)
{
DeselectHoveredObject();
return;
}
if (!gazeTarget.IsDisabled)
{
if (gazeTarget != _currentHoveredTarget)
{
if (_currentHoveredTarget != null)
{
DeselectHoveredObject();
}
_currentHoveredTarget = gazeTarget;
switch (CurrentConfirmationMethod)
{
case TestBlock.ConfirmationMethod.Dwell:
_currentHoveredTarget.OnDwell += WaitForDwell;
break;
case TestBlock.ConfirmationMethod.HeadGesture:
HasNodded += OnNod;
_waitingForGesture = true;
break;
}
}
gazeTarget.OnEyeIn();
}
}
private EyeGazeTarget SpawnTarget(int sequenceIndex, int stepNumber, bool activeTarget)
{
float angle = TestBlockData.Sequences[sequenceIndex].Trials[stepNumber].TargetAngle;
float amplitude = TestBlockData.Sequences[sequenceIndex].TargetAmplitude;
float size = TestBlockData.Sequences[sequenceIndex].TargetWidth;
Vector2 spawnPosition = GetTargetSpawnPosition(amplitude, angle);
GameObject target = Instantiate(activeTarget ? _eyeGazeTargetPrefab : _eyeGazeInactiveTargetPrefab, Vector3.zero, Quaternion.identity);
target.transform.SetParent(_targetCanvas.transform, false);
if (activeTarget)
{
target.transform.SetAsFirstSibling();
}
EyeGazeTarget eyeGazeTarget = target.GetComponent <EyeGazeTarget>();
eyeGazeTarget.SetSize(size);
eyeGazeTarget.SetPosition(spawnPosition.x, spawnPosition.y);
CurrentTarget = target.GetComponent <EyeGazeTarget>();
CurrentTarget.OnFixate += TargetFixated;
CurrentTarget.OnActivated += TargetActivated;
CurrentTarget.OnReleased += TargetReleased;
eyeGazeTarget.transform.SetAsLastSibling();
return(eyeGazeTarget);
}
/// <summary>
/// If the other object has an EyeGazeTarget component,
/// signal the subscriber to the appropriate event in VREyeTrackercontroller.cs.
/// </summary>
/// <param name="other"> The collider of the other object.</param>
void OnTriggerEnter(Collider other)
{
EyeGazeTarget target = other.transform.parent.GetComponent <EyeGazeTarget>();
if (target == null)
{
return;
}
if (_trackedTarget != null)
{
if (_trackedTarget == target)
{
return;
}
if (TargetUnhovered != null)
{
TargetUnhovered(_trackedTarget);
}
}
_trackedTarget = target;
if (TargetHovered != null)
{
TargetHovered(target);
}
}
/// <summary>
/// If the other object has an EyeGazeTarget component, signal the TargetStayed event's subscriber.
/// </summary>
/// <param name="other"> The collider of the other object.</param>
void OnTriggerStay(Collider other)
{
EyeGazeTarget target = other.transform.parent.GetComponent <EyeGazeTarget>();
if (target != null)
{
if (TargetStayed != null)
{
TargetStayed(target);
}
}
}
/// <summary>
/// If the other object has an EyeGazeTarget component, signal the TargetUnhovered event's subscriber.
/// </summary>
/// <param name="other"> The collider of the other object.</param>
void OnTriggerExit(Collider other)
{
EyeGazeTarget target = other.transform.parent.GetComponent <EyeGazeTarget>();
if (target != null)
{
if (TargetUnhovered != null)
{
TargetUnhovered(target);
}
}
_trackedTarget = null;
}
/// <summary>
/// Handles unsubscribing when cursor leaves target.
/// </summary>
private void DeselectHoveredObject()
{
if (_currentHoveredTarget == null)
{
return;
}
switch (CurrentConfirmationMethod)
{
case TestBlock.ConfirmationMethod.Dwell:
_currentHoveredTarget.OnDwell -= WaitForDwell;
break;
case TestBlock.ConfirmationMethod.HeadGesture:
HasNodded -= OnNod;
break;
}
_currentHoveredTarget.OnEyeOut();
_currentHoveredTarget = null;
}
private void OnCursorUnhover(EyeGazeTarget target)
{
HandleTrackedObject(null);
}
private void OnCursorStay(EyeGazeTarget target)
{
HandleTrackedObject(target);
}
private void OnCursorHover(EyeGazeTarget target)
{
OnCursorStay(target);
}
