example.dart

import 'package:sky/widgets.dart';

class Inside extends StatefulComponent {
  void syncConstructorArguments(Inside source) {
  }

  Widget build() {
    return new Listener(
      onPointerDown: _handlePointerDown,
      child: new Container(
        decoration: new BoxDecoration(
          backgroundColor: new Color(0xFFFFFF00)
        )
      )
    );
  }

  EventDisposition _handlePointerDown(_) {
    setState(() { });
    return EventDisposition.processed;
  }
}

class Middle extends StatefulComponent {
  Inside child;

  Middle({ this.child });

  void syncConstructorArguments(Middle source) {
    child = source.child;
  }

  Widget build() {
    return new Listener(
      onPointerDown: _handlePointerDown,
      child: child
    );
  }

  EventDisposition _handlePointerDown(_) {
    setState(() { });
    return EventDisposition.processed;
  }

}

class Outside extends App {
  Widget build() {
    return new Middle(child: new Inside());
  }
}

void main() {
  runApp(new Outside());
}