How to add separate style in inline code and codeblock in flutter_markdown

Question

There are two types of code markdown one is inline code(1 backticks) and another is codeblock (3 backticks)

Markdown(
      controller: scrollController,
      selectable: true,
      builders: {
        'code': CodeElementBuilder()
       },
      styleSheet: MarkdownStyleSheet(
        textScaleFactor: 1.0,
        codeblockPadding: EdgeInsets.all(10),
      ),
      data: data,
      styleSheetTheme: MarkdownStyleSheetBaseTheme.material,
   );

I create a custom codeElementBuilder by using this example Codeblock Syntax Builder

but it also apply to inline code how can I separate both style inlineCode and codeblock.

I am using flutter_markdown package to add markdown

Tiago Alves · Accepted Answer · 2023-04-25 11:39:18Z

1

You can add a builder to pre instead of code and it will apply only to code blocks. For example:

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)),
            ),
          ),
        ),
      ),
    );
  }
}

answered Apr 25, 2023 at 11:39

Tiago Alves

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4 Comments

Nikhil kumar Over a year ago

It is working but when we use visitText(md.Text text .. we only get text code but I also want to get language Ex cpp,java at the starting of Element. Which is exist in visitElementBefore(md.Element e) or visitElementAfter(md.Element e) but these function not working with pre tag.

Tiago Alves Over a year ago

yeah, I'm afraid you won't be able to accomplish this without forking the package. Here is where you pre custom MarkdownBuilder's visitText is called: github.com/flutter/packages/blob/… Notice you are calling your custom builder instead of Scrollbar(...). That's the only place you can overwrite pre behavior.

Alois Over a year ago

I successfully did it with visit before and visitText

dart   var language = '';   @override   void visitElementBefore(md.Element element) {     if (element.tag == 'pre') {       language = '';       final codeTag = element.children?.first;       if (codeTag is md.Element && codeTag.attributes['class'] != null) {         String lg = codeTag.attributes['class'] as String;         language = lg.substring(9);       }     }     super.visitElementBefore(element);   }

And then in visitText you now have the language.

Fuad Efendi Mar 9 at 15:03

Where formatText comes from?

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