The scrolling package provides helpers for directives that react to scroll events.
The cdkScrollable directive and the ScrollDispatcher service together allow components to react to scrolling in any of its ancestor scrolling containers.
The cdkScrollable directive should be applied to any element that acts as a scrolling container. This marks the element as a Scrollable and registers it with the ScrollDispatcher. The dispatcher, then, allows components to share both event listeners and knowledge of all of the scrollable containers in the application.