of<T extends Object?> method Null safety

  1. @optionalTypeArgs
ModalRoute<T>? of<T extends Object?>(
  1. BuildContext context
)
optionalTypeArgs">@optionalTypeArgs

Returns the modal route most closely associated with the given context.

Returns null if the given context is not associated with a modal route.

link
Typical usage is as follows: 
ModalRoute<int>? route = ModalRoute.of<int>(context);

The given BuildContext will be rebuilt if the state of the route changes while it is visible (specifically, if isCurrent or canPop change value).

Implementation

@optionalTypeArgs
static ModalRoute<T>? of<T extends Object?>(BuildContext context) {
  final _ModalScopeStatus? widget = context.dependOnInheritedWidgetOfExactType<_ModalScopeStatus>();
  return widget?.route as ModalRoute<T>?;
}