buildModalBarrier method

@override Widget buildModalBarrier()

Build the barrier for this ModalRoute, subclasses can override this method to create their own barrier with customized features such as color or accessibility focus size.

See also:

• ModalBarrier, which is typically used to build a barrier.
• ModalBottomSheetRoute, which overrides this method to build a customized barrier.

Implementation

@override
Widget buildModalBarrier() {
  void onDismiss() => unawaited(_dismiss());
  final color = barrierColor;
  if (color == null || color.a == 0 || offstage) {
    return ModalBarrier(
      dismissible: barrierDismissible,
      semanticsLabel: barrierLabel,
      barrierSemanticsDismissible: semanticsDismissible,
      onDismiss: onDismiss,
    );
  }
  return AnimatedModalBarrier(
    color: animation!.drive(
      ColorTween(begin: color.withValues(alpha: 0), end: color),
    ),
    dismissible: barrierDismissible,
    semanticsLabel: barrierLabel,
    barrierSemanticsDismissible: semanticsDismissible,
    onDismiss: onDismiss,
  );
}