MaterialPageRoute<T> constructor

MaterialPageRoute<T>({@required WidgetBuilder builder, RouteSettings settings, bool maintainState: true, bool fullscreenDialog: false })

Construct a MaterialPageRoute whose contents are defined by builder.

The values of builder, maintainState, and fullScreenDialog must not be null.

Implementation 

MaterialPageRoute({
  @required this.builder,
  RouteSettings settings,
  this.maintainState = true,
  bool fullscreenDialog = false,
}) : assert(builder != null),
     assert(maintainState != null),
     assert(fullscreenDialog != null),
     super(settings: settings, fullscreenDialog: fullscreenDialog) {
  // ignore: prefer_asserts_in_initializer_lists , https://github.com/dart-lang/sdk/issues/31223
  assert(opaque);
}