Monitors the _active_ views, i.e.
Monitors the _active_ views, i.e. views which are intersecting with the current transport position.
The view must store a handle to its underlying model.
Registers a live observer with this observable.
Registers a live observer with this observable. The method is called with the
observing function which receives the observable's update message of type A
, and the
method generates an opaque Disposable
instance, which may be used to
remove the observer eventually (through the dispose
method).
Returns the set of _active_ views, i.e.
Returns the set of _active_ views, i.e. views which are intersecting with the current transport position.