基于“同级”(自定义RenderStack)调整颤动小部件的大小

import 'package:flutter/material.dart';

class CustomRenderStack extends SingleChildRenderObjectWidget {
  const CustomRenderStack({
    Key? key,
    this.alignment = AlignmentDirectional.topStart,
    this.fit = StackFit.loose,
    this.overflow = Overflow.clip,
    Widget? child,
  }) : super(key: key, child: child);

  final AlignmentGeometry alignment;
  final StackFit fit;
  final Overflow overflow;

  @override
  RenderObject createRenderObject(BuildContext context) {
    return RenderCustomStack(
      alignment: alignment,
      fit: fit,
      overflow: overflow,
    );
  }

  @override
  void updateRenderObject(BuildContext context, RenderCustomStack renderObject) {
    renderObject
      ..alignment = alignment
      ..fit = fit
      ..overflow = overflow;
  }
}

class RenderCustomStack extends RenderStack {
  RenderCustomStack({
    List<RenderBox>? children,
    AlignmentGeometry alignment = AlignmentDirectional.topStart,
    StackFit fit = StackFit.loose,
    Overflow overflow = Overflow.clip,
  }) : super(
          alignment: alignment,
          fit: fit,
          overflow: overflow,
          children: children,
        );

  @override
  void performLayout() {
    // 自定义布局逻辑，根据需求调整颤动小部件的大小
    // ...
    super.performLayout();
  }
}