ScrollConfigurationDelegate of(BuildContext context)

The delegate property of the closest instance of this class that encloses the given context.

If no such instance exists, returns a default ScrollConfigurationDelegate that approximates the scrolling physics of the current platform (see defaultTargetPlatform) using a OverscrollWhenScrollableBehavior behavior model.

Typical usage is as follows:

ScrollConfigurationDelegate scrollConfiguration = ScrollConfiguration.of(context);

Source 

static ScrollConfigurationDelegate of(BuildContext context) {
  ScrollConfiguration configuration = context.inheritFromWidgetOfExactType(ScrollConfiguration);
  return configuration?.delegate ?? _defaultDelegate;
}