PDF Viewer Library

A comprehensive, production-ready PDF viewer library built with React and TypeScript that supports multiple PDFs, annotations, highlighting, and advanced navigation features.

Features

Core Features:

• Multiple PDF document support with dropdown selection
• Page-by-page navigation with thumbnails
• Zoom in/out functionality (25% to 300%)
• Download individual pages as PNG files
• Drawing annotations (pen and highlighter tools)
• Text highlighting based on bounding box coordinates
• Undo/redo functionality for annotations
• Keyboard shortcuts for navigation and controls

Design Elements:

• Clean, modern interface with intuitive controls
• Responsive design that works on all screen sizes
• Smooth animations and hover effects
• Professional color scheme with proper contrast
• Accessible keyboard navigation
• Context-aware tooltips and status information

Usage

Basic Implementation

import { PDFViewer } from './components/PDFViewer/PDFViewer';
import { PDFDocument, BoundingBox } from './types/pdf';

const documentData: PDFDocument = {
  files: ["Document1.pdf", "Document2.pdf"],
  presigned_urls: {
    "Document1.pdf": {
      "1": "https://example.com/doc1-page1.png",
      "2": "https://example.com/doc1-page2.png"
    },
    "Document2.pdf": {
      "1": "https://example.com/doc2-page1.png"
    }
  }
};

const boundingBoxes: BoundingBox[] = [
  {
    supporting_sentence_in_document: "Important text to highlight",
    document_name: "Document1.pdf",
    section_name: "Section 1",
    page_number: "1",
    bbox: [[[0.1, 0.1, 0.9, 0.1, 0.9, 0.2, 0.1, 0.2]]]
  }
];

function App() {
  return (
    <PDFViewer
      documentData={documentData}
      boundingBoxes={boundingBoxes}
      onDocumentChange={(doc) => console.log('Document changed:', doc)}
      onPageChange={(page) => console.log('Page changed:', page)}
      onAnnotationAdd={(annotation) => console.log('Annotation added:', annotation)}
    />
  );
}

Advanced Usage with Hooks

import { usePDFViewer } from './hooks/usePDFViewer';

function PDFViewerContainer() {
  const {
    documentData,
    boundingBoxes,
    annotations,
    loadDocument,
    loadBoundingBoxes,
    addAnnotation,
    exportAnnotations
  } = usePDFViewer();

  const handleLoadDocument = () => {
    loadDocument(myDocumentData);
    loadBoundingBoxes(myBoundingBoxes);
  };

  const handleExportAnnotations = () => {
    const annotationData = exportAnnotations();
    // Save or process annotation data
  };

  return (
    <div>
      <button onClick={handleLoadDocument}>Load Document</button>
      <button onClick={handleExportAnnotations}>Export Annotations</button>
      
      {documentData && (
        <PDFViewer
          documentData={documentData}
          boundingBoxes={boundingBoxes}
          onAnnotationAdd={addAnnotation}
        />
      )}
    </div>
  );
}

API Reference

PDFViewer Props

Prop	Type	Required	Description
documentData	PDFDocument	Yes	Object containing PDF files and their page URLs
boundingBoxes	BoundingBox[]	No	Array of bounding box coordinates for highlighting
onDocumentChange	(documentName: string) => void	No	Callback when document is changed
onPageChange	(pageNumber: number) => void	No	Callback when page is changed
onAnnotationAdd	(annotation: Annotation) => void	No	Callback when annotation is added
className	string	No	Additional CSS classes

Data Types

PDFDocument

interface PDFDocument {
  files: string[];
  presigned_urls: Record<string, Record<string, string>>;
}

BoundingBox

interface BoundingBox {
  supporting_sentence_in_document: string;
  document_name: string;
  section_name: string;
  page_number: string;
  bbox: number[][][];
}

Annotation

interface Annotation {
  id: string;
  type: 'pen' | 'highlighter';
  points: AnnotationPoint[];
  color: string;
  thickness: number;
  pageNumber: number;
}

Keyboard Shortcuts

• Arrow Left/Right: Navigate between pages
• Ctrl/Cmd + Plus/Minus: Zoom in/out
• Ctrl/Cmd + Z: Undo annotation
• Ctrl/Cmd + Y or Ctrl/Cmd + Shift + Z: Redo annotation
• Escape: Exit annotation mode

Customization

The library uses Tailwind CSS for styling and can be easily customized by modifying the component classes or extending the design system.

Custom Colors

// Modify annotation colors
const customAnnotation = {
  ...annotation,
  color: '#FF5733', // Custom color
  thickness: 5      // Custom thickness
};

Custom Toolbar

You can replace the default toolbar by creating your own component that uses the same event handlers:

<CustomToolbar
  onFileChange={handleFileChange}
  onPageChange={handlePageChange}
  onZoomIn={handleZoomIn}
  // ... other handlers
/>

Browser Support

• Chrome 90+
• Firefox 88+
• Safari 14+
• Edge 90+

Performance Considerations

• Images are loaded on-demand for better performance
• Annotations are rendered using HTML5 Canvas for smooth drawing
• Zoom operations are optimized with requestAnimationFrame
• Memory usage is optimized by cleaning up unused canvases

Contributing

This library is designed to be modular and extensible. Key areas for contribution:

1. Additional annotation tools (shapes, text, etc.)
2. Export formats (PDF with annotations, etc.)
3. Thumbnail navigation panel
4. Search functionality
5. Accessibility improvements

License

MIT License - see LICENSE file for details.