Highlight.js in Sketchware

1. This example shows how to use highlight.js library to display highlighted code in WebView.

2. In main.xml, add two Spinners spinner1 and spinner2, add an EditText edittext1, and a Button button1.

3. In permission manager, add INTERNET permissions.

4. Add an Intent component intent.

5. Add two List String code_languages and css_links.

6. In onCreate,

* Add all languages to code_languages using following code and display it in spinner1.


String[] languages = {

    "Html", "CSS", "C", "Cpp", "Rust", "Go", "Zig",

    "Java", "Kotlin", "JSON", "Scala", "Groovy",

    "JavaScript", "TypeScript", "Python", "Ruby", "PHP", "Perl",

    "Swift", "Dart", "Julia", "MATLAB",

    "Haskell", "OCaml", "Elixir", "Erlang",

    "SQL", "Bash", "Lua", "Assembly", "XML"

};

Collections.addAll(code_languages, languages);

* Add following css links to List css_links and display it in spinner2.


<!-- Default theme -->

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/default.min.css">

<!-- GitHub theme (light) -->
<link rel="stylesheet" 
      href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/github.min.css">

<!-- GitHub Dark theme -->
<link rel="stylesheet" 
      href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/github-dark.min.css">

<!-- Atom One Dark (popular dark theme) -->
<link rel="stylesheet" 
      href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/atom-one-dark.min.css">

<!-- VS Code-like theme -->
<link rel="stylesheet" 
      href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/vs2015.min.css">

<!-- Monokai theme -->
<link rel="stylesheet" 
      href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/monokai.min.css">
      
<!-- Nord theme -->

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/nord.min.css">

7. Create a new page highlight.xml.

8. In button1 onClick event, use intent to move to HighlightActivity, with extra keys code, language, and theme.

9. In highlight.xml, add a WebView webview1 with padding 0.

10. In asset manager, add a file index.html and put following codes in it.


<!DOCTYPE html>
<html>
<head>
*theme*
    <link rel="stylesheet" href="style.css">
</head>
<body>
<pre><code class="language-*lang*">
*code*
</code></pre>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/highlight.min.js"></script>
    <script>
        // Auto-detect language and highlight all code blocks
        document.addEventListener('DOMContentLoaded', (event) => {
            document.querySelectorAll('pre code').forEach((block) => {
                hljs.highlightElement(block);
            });
        });
    </script>
</body>
</html>

11. Create another file called style.css in asset manager add put following codes in it.


/* Remove default margins and padding */
html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}

/* Preformatted code blocks - full screen */
pre {
    position: relative;
    border-radius: 0; /* Remove rounded corners for full screen */
    overflow-x: auto;
    margin: 0;
    padding: 0;
    height: 100vh; /* Use full viewport height */
    width: 100vw; /* Use full viewport width */
    box-sizing: border-box;
}

pre code {
    display: block;
    padding: 1em;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    font-size: 0.9em;
    line-height: 1.5;
    color: #f8f8f2;
    background: transparent;
    border: none;
    height: 100%;
    box-sizing: border-box;
}

/* Language label for code blocks */
pre::before {
    content: attr(data-language);
    position: absolute;
    top: 0;
    right: 0;
    background: #555;
    color: #fff;
    padding: 2px 8px;
    font-size: 0.8em;
    border-radius: 0 0 0 6px; /* Adjust border-radius since top-right is now 0 */
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    z-index: 1;
}

/* Highlight.js overrides */
.hljs {
    background: transparent !important;
    color: #f8f8f2;
    border-radius: 0; /* Remove rounded corners */
    height: 100%;
    min-height: 100vh;
    box-sizing: border-box;
}

pre code.hljs {
    padding: 12px;
    height: 100%;
}

.hljs-keyword { color: #cc99cd; }
.hljs-string { color: #7ec699; }
.hljs-number { color: #f08d49; }
.hljs-function { color: #f08d49; }
.hljs-comment { color: #999; }
.hljs-title { color: #7ec699; }
.hljs-params { color: #f8f8f2; }

12. Create a more block of type String (returns string) with name parseHtml [String code] and put following codes in it.


return _code.replace("&", "&amp;")
            .replace("<", "&lt;")
            .replace(">", "&gt;")
            .replace("\"", "&quot;");

13. Create String variables code, parsedCode, language, theme, htmlContent.

14. In onCreate event use codes and blocks as shown below.



Here the code for WebView is:


WebSettings webSettings = binding.webview1.getSettings();
webSettings.setJavaScriptEnabled(true);

binding.webview1.loadDataWithBaseURL(null, htmlContent, "text/html", "UTF-8", null);




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