This method can be used directly by subclasses if the parameter value
reference remaing the same but there has been changes to the value so
listeners should be notified
Also, we create a new thread to do the updating here since this may be
called during the process of updating a parameter.
A map of visual constraints, with flags indicating if they are active or not
We actually only care about the ViewRenderingListener constraints here,
the other ones can do their job without knowing about the view rendering