Added #

• Text selection support
  • SelectableVerticalText widget for user text selection
  • Tap to select single character
  • Drag to select text range
  • Long-press to show copy menu
  • Copy to clipboard functionality
  • Selection highlighting with customizable color
  • Selection demo page in example app

New Widgets #

• SelectableVerticalText - Vertical text with selection support
• Selection demo at example/lib/demos/selection_demo.dart

Features #

• Character-level hit testing for accurate selection
• Visual selection highlighting
• Context menu with copy action
• Works with ruby (furigana) and kenten annotations

Added #

• Performance optimizations
  • TextPainter reuse in VerticalTextPainter to reduce allocations
  • TextPainter reuse in VerticalRichTextPainter to reduce allocations
  • Optimized rendering pipeline for better performance

Changed #

• Reused TextPainter instances in character rendering methods
• Optimized _drawCharacter() and _drawRuby() methods

Performance Impact #

• ~50% reduction in TextPainter allocations
• Improved rendering performance for scrollable vertical text lists
• Reduced memory pressure during text rendering

Added #

• Initial release
• Basic vertical text layout (top-to-bottom, right-to-left)
• Ruby (furigana) support
• Kenten (emphasis dots) with multiple styles
• Tatechuyoko (horizontal text in vertical layout)
• Kinsoku shori (Japanese line breaking rules)
• Advanced kerning and character spacing
• Yakumono adjustment (punctuation positioning)
• Text selection with context menu
• RichText support for multiple styles
• Figure layout with captions and text wrapping