/// <summary>
/// This funcion is called when snapper exits the snapping region.
/// It calls snappable object's OnSnappedExit if any.
/// </summary>
protected virtual void OnSnappedExit()
{
if (SnappedObject != null && !SnappedObject.Equals(null))
{
SnappedObject.OnSnappedExit(this);
}
}
/// <summary>
/// This function is called for every FixedUpdate cycle. It checks if
/// snapper is now in any snapping region and if so, snaps itself to
/// any snappable object.
/// </summary>
public virtual void SnapUpdate()
{
// Test if the snapped object is still there (i.e. not destroyed)
if (SnappedObject != null && SnappedObject.Equals(null))
{
IsSnapped = false;
SnappedObject = null;
return;
}
bool isSnappedToTheSameObject;
ISnappable firstSnappedObject;
IsSnapped = GetSnappingStatus(out isSnappedToTheSameObject,
out firstSnappedObject);
if (LastSnappingStatus)
{
if (IsSnapped)
{
if (isSnappedToTheSameObject)
{
// All is good. Don't need to do anything.
}
else
{
// Snapped to the different object. Do some finish up.
// OnSnappedExit for the current snapped object.
OnSnappedExit();
SnappedObject = firstSnappedObject;
// OnSnappedEnter for the new snapped object.
OnSnappedEnter();
}
}
else
{
// Not snapped to the object any more.
OnSnappedExit();
SnappedObject = null;
}
}
else
{
if (IsSnapped)
{
// Start to snap to the object.
SnappedObject = firstSnappedObject;
OnSnappedEnter();
}
else
{
// Still not snap to anything. Do nothing here.
}
}
if (IsSnapped)
{
OnSnappedStay();
}
LastSnappingStatus = IsSnapped;
}