ObsiViewer/CODE_BLOCK_FIXES.md

Code Block Component - Fixes Applied

Issues Fixed ✅

1. Line Numbers Not Working

Problem: Line numbers were displayed but the code content overlapped them because there was no padding.

Solution:

• Added dynamic padding to the <pre> element based on props.showLineNumbers
• When line numbers are shown: padding: 12px 12px 12px 48px (48px left padding for line numbers)
• When line numbers are hidden: padding: 12px
• Applied the same font family to line numbers to ensure proper alignment

2. Font Selection Menu Missing

Problem: There was no way to change the font of the code block.

Solution:

• Added availableFonts array with popular monospace fonts:
  • JetBrains Mono
  • Fira Code
  • Consolas
  • Monaco
  • Courier New
  • Monospace
• Added font selection menu in the "More" dropdown
• Implemented onFontChange() method to update the font
• Implemented getFontFamily() method to apply the selected font
• Font is applied via [style.font-family]="getFontFamily()"

3. Language Detection Not Working

Problem: There was no automatic language detection feature.

Solution:

• Implemented detectLanguageInternal() method with pattern matching for 16+ languages
• Auto-detection runs on component initialization if no language is set
• Added "Auto-detect Language" button in the menu
• Detection patterns include:
  • JavaScript, TypeScript, Python, Java, C#, C++, C, Go, Rust
  • PHP, Ruby, HTML, CSS, JSON, XML, YAML
  • SQL, Bash, Dockerfile, Markdown

4. Theme Selection Doesn't Change Text Color

Problem: Theme selection menu was missing.

Solution:

• Added theme selection menu in the "More" dropdown
• Lists all available themes from CodeThemeService
• Implemented onThemeChange() method
• Fixed getThemeClass() to use 'darcula' as default theme
• Theme CSS class is properly applied to the code container

5. Preview/Collapse Option Missing

Problem: The header didn't have a collapse/preview toggle like the file block.

Solution:

• Complete UI restructure following the file block pattern
• Added header button with:
  • 💻 emoji icon
  • Language label
  • Line count display
  • "More" menu (⋮ button)
  • Collapse/Preview label
• Implemented toggleCollapse(), isCollapsed() methods
• Code editor is conditionally rendered based on !isCollapsed()
• Uses props.collapsed to track state

New Features Added 🎁

Enhanced Menu System

• Created comprehensive dropdown menu with sections:
  • Language Selection: All supported languages with visual checkmarks
  • Theme Selection: All available themes
  • Font Selection: Multiple monospace font options
  • Options: Toggle line numbers and word wrap
  • Actions: Copy to clipboard and auto-detect language

Better UX

• Menu closes automatically after selection
• Menu positioning follows cursor
• Escape key closes menu
• Click outside closes menu
• Visual feedback (checkmarks) for selected options

Keyboard Accessibility

• Header button supports Enter and Space keys
• ARIA attributes for screen readers
• Focus management

Additional Utilities

• getLineCount(): Shows number of lines in the header
• getLanguageLabel(): Displays friendly language name
• copyToClipboard(): One-click code copying
• onBlur(): Updates line numbers after editing

Architecture Improvements

Consistent with File Block

The component now follows the same pattern as the file block:

• Same header structure
• Same menu positioning logic
• Same collapse/expand behavior
• Better visual consistency across the app

Better State Management

• All props updates go through this.update.emit()
• Menu state managed with menuOpen and menuPos
• Proper cleanup with @HostListener decorators

Testing Recommendations

1. Test Line Numbers:

   • Toggle line numbers on/off
   • Add/remove lines and verify numbers update
   • Check alignment with different fonts

2. Test Themes:

   • Switch between all available themes
   • Verify text color changes properly
   • Check that default theme (Darcula) loads correctly

3. Test Fonts:

   • Try each font option
   • Verify line numbers align correctly with each font
   • Check that font persists after editing

4. Test Language Detection:

   • Paste code in different languages
   • Click "Auto-detect Language"
   • Verify correct language is detected

5. Test Collapse/Expand:

   • Click header to collapse
   • Verify content hides
   • Verify "Preview/Collapse" label updates
   • Expand and verify content shows

6. Test Menu:

   • Open menu and click outside to close
   • Press Escape to close
   • Select options and verify menu closes
   • Check menu positioning on different screen sizes

Known Limitations

1. Language Detection: The detection is pattern-based and may not be 100% accurate for ambiguous code snippets.
2. Font Loading: Custom fonts (JetBrains Mono, Fira Code) need to be loaded in your app for them to work properly. Consider adding them to your global styles.
3. Syntax Highlighting: This component uses CSS themes but doesn't have actual syntax highlighting (would need a library like Prism or Highlight.js for that).

Next Steps (Optional Enhancements)

1. Add syntax highlighting with Prism.js or Highlight.js
2. Add line highlighting feature
3. Add search/replace functionality
4. Add code folding
5. Load custom fonts via CDN or local assets
6. Add more sophisticated language detection (using a library)
7. Add export functionality (download as file)