maybeOf static method Null safety

ShortcutRegistry? maybeOf(
  1. BuildContext context
)

Returns ShortcutRegistry of the ShortcutRegistrar that most tightly encloses the given BuildContext.

If no ShortcutRegistrar widget encloses the given context, maybeOf will return null.

There is a default ShortcutRegistrar instance in WidgetsApp, so if WidgetsApp, MaterialApp or CupertinoApp are used, an additional ShortcutRegistrar isn't needed.

See also:

  • of, which is similar to this function, but returns a non-nullable result, and will throw an exception if it doesn't find a ShortcutRegistrar ancestor.

Implementation

static ShortcutRegistry? maybeOf(BuildContext context) {
  assert(context != null);
  final _ShortcutRegistrarMarker? inherited =
    context.dependOnInheritedWidgetOfExactType<_ShortcutRegistrarMarker>();
  return inherited?.registry;
}