如何通过引用将数据传递给有状态的小部件？我想要更改有状态小部件中的变量并更新原始变量

class DataModel {
  String variable;
  
  DataModel(this.variable);
}

class ParentWidget extends StatefulWidget {
  @override
  _ParentWidgetState createState() => _ParentWidgetState();
}

class _ParentWidgetState extends State<ParentWidget> {
  DataModel dataModel = DataModel("Initial Value");

  @override
  Widget build(BuildContext context) {
    return ChildWidget(dataModel: dataModel);
  }
}

class ChildWidget extends StatefulWidget {
  final DataModel dataModel;

  ChildWidget({required this.dataModel});

  @override
  _ChildWidgetState createState() => _ChildWidgetState();
}

class _ChildWidgetState extends State<ChildWidget> {
  late DataModel _localDataModel;

  @override
  void initState() {
    super.initState();
    _localDataModel = widget.dataModel;
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Column(
        children: [
          Text(_localDataModel.variable),
          ElevatedButton(
            onPressed: () {
              setState(() {
                _localDataModel.variable = "Updated Value";
              });
            },
            child: Text("Update Variable"),
          ),
        ],
      ),
    );
  }
}