state_flow_test.dart

import 'package:flutter_util/flow/state_flow.dart';

void main() {
  final stateFlow = StateFlow<int>(0);

  // 先订阅
  final subscription = stateFlow.stream.listen((data) {
    print('StateFlow Received: $data');
  });

  // 更新状态
  stateFlow.emit(1);
  stateFlow.emit(2);
  stateFlow.emit(2); // 不会触发更新，因为值没有变化

  subscription.cancel();
  stateFlow.close();
}