您可以将构建器添加到pre而不是code，它将仅适用于code blocks。例如：

MarkdownBody(
...
 builders: {
   "pre": CodeBlockMarkdownElementBuilder(),
 },
...
);

class CodeMarkdownElementBuilder extends MarkdownElementBuilder {
  ScrollController verticalController = ScrollController();
  ScrollController horizontalController = ScrollController();
  @override
  Widget visitText(md.Text text, TextStyle? preferredStyle) {
    return ConstrainedBox(
      constraints: BoxConstraints(maxHeight: 200),
      child: Scrollbar(
        controller: verticalController,
        child: SingleChildScrollView(
          scrollDirection: Axis.vertical,
          controller: verticalController,
          child: Scrollbar(
            controller: horizontalController,
            child: SingleChildScrollView(
              scrollDirection: Axis.horizontal,
              controller: horizontalController,
              child: Text.rich(formatText(preferredStyle, text.text)),
            ),
          ),
        ),
      ),
    );
  }
}