如何从flutter中的另一个自定义微件分配微件子(容器)的高度和宽度

class ParentWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (BuildContext context, BoxConstraints constraints) {
        // 获取父级容器的高度和宽度
        double parentHeight = constraints.maxHeight;
        double parentWidth = constraints.maxWidth;

        // 返回子级容器，并将父级容器的尺寸传递给它
        return ChildWidget(parentHeight: parentHeight, parentWidth: parentWidth);
      },
    );
  }
}

class ChildWidget extends StatelessWidget {
  final double parentHeight;
  final double parentWidth;

  ChildWidget({required this.parentHeight, required this.parentWidth});

  @override
  Widget build(BuildContext context) {
    // 在这里可以使用父级容器的高度和宽度进行布局
    // 例如，设置子级容器的高度为父级容器高度的一半，宽度为父级容器宽度的三分之一
    double childHeight = parentHeight / 2;
    double childWidth = parentWidth / 3;

    return Container(
      height: childHeight,
      width: childWidth,
      color: Colors.blue,
      child: Text('Child Widget'),
    );
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Widget Allocation',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter Widget Allocation'),
        ),
        body: ParentWidget(),
      ),
    );
  }
}