on method

VoidCallback on(
  1. String method,
  2. Handler handler
)

Implementation

VoidCallback on(String method, Handler handler) {
  final nativeMessageHandlers = _nativeMessageHandlers[method] ?? <Handler>[];
  nativeMessageHandlers.add(handler);
  _nativeMessageHandlers[method] = nativeMessageHandlers;

  return () {
    final nativeMessageHandlers = _nativeMessageHandlers[method] ?? <Handler>[];
    nativeMessageHandlers.remove(handler);
  };
}