void OnTriggerEnter(Collider c)
{
if (c.GetComponent <Holdable>() != null)
{
holdable = c.GetComponent <Holdable>();
holdable.SetHighlightColor();
}
else if (c.GetComponent <Button>() != null)
{
button = c.GetComponent <Button>();
}
else if (c.transform.parent.parent.GetComponent <SliderScript>() != null)
{
slider = c.transform.parent.parent.GetComponent <SliderScript>();
}
}