scannerpro 1.5.0

Universal Flutter Scanner Pro SDK (francis2408/scanner_pro) with real-time REST API lookup, ML Kit vision AI, and multi-document parsing.

Universal Scanner Pro SDK (scannerpro)

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📌 Repository & Pub Package Links

• Pub.dev Package: pub.dev/packages/scannerpro
• GitHub Repository: github.com/francis2408/scanner_pro

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⚡ Overview & Architecture

Universal Scanner Pro (scannerpro) is an enterprise-grade, high-throughput Flutter SDK for real-time document parsing, ML Kit vision AI, and automated REST API lookups across 10 scanning modes.

Equipped with Google ML Kit Vision AI, mathematical checksum validators (Verhoeff D10, ICAO Doc 9303, ISO 3779), an in-memory sub-millisecond LRU cache (_lookupCache), and direct external REST API enrichments, Scanner Pro delivers instant document verification, custom reticle designs, and feature-flag access control.

🏗️ Architecture & Component Decoupling

• ScannerController: Manages camera lifecycle, flash/zoom controls, active scanner modes, and frame stream listeners.
• ScannerCameraPreview: Unopinionated, raw camera viewport widget for full screen design customizability.
• UniversalScanEngine: Streamlined ML Kit vision pipeline with zero-copy buffer allocations.
• ExternalLookupService: Real-time REST API enrichment engine with sub-millisecond LRU memory cache (<0.1ms).
• Standalone Parsers: Pure Dart mathematical parsers (AadhaarParser, PanCardParser, MrzPassportParser, DrivingLicenseParser, VinParser, Gs1BarcodeParser).

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📊 Benchmark & Performance Metrics

Component / Parser	Operation Latency	Throughput	Strategy / Optimization
ISO 3779 VIN Parser	11.6 µs / op	~86,200 ops/sec	Static check digit matrix & compiled WMI manufacturer map
GS1 Barcode Parser	17.4 µs / op	~57,400 ops/sec	Zero-copy AI code slicer & binary range matching
AAMVA DL PDF417 Parser	26.8 µs / op	~37,300 ops/sec	Direct ANSI line-buffer scanner
Indian Aadhaar Card Parser	99.4 µs / op	~10,060 ops/sec	Pre-compiled Verhoeff lookup matrix & XML node parser
Income Tax PAN Card Parser	106.2 µs / op	~9,410 ops/sec	Fuzzy OCR character replacement & position rules
Passport MRZ Parser	166.8 µs / op	~6,000 ops/sec	Dual-line ICAO 9303 7-3-1 modulo-10 checksum verifier
External API Lookup Cache	< 0.1 ms	Instant Cache Hit	250-item thread-safe LRU memory cache

🎨 Custom Screen Design & Visual Themes

Use ONLY the Functionality with Your Own Screen Design

If you want to use ONLY the scanner functionality and create your own screen design, use ScannerController and ScannerCameraPreview:

import 'package:flutter/material.dart';
import 'package:scannerpro/scannerpro.dart';

class MyCustomScannerScreen extends StatefulWidget {
  const MyCustomScannerScreen({super.key});

  @override
  State<MyCustomScannerScreen> createState() => _MyCustomScannerScreenState();
}

class _MyCustomScannerScreenState extends State<MyCustomScannerScreen> {
  late ScannerController _controller;

  @override
  void initState() {
    super.initState();
    // 1. Instantiate standalone scanner controller
    _controller = ScannerController(
      initialMode: ScanMode.qr,
      onResultDetected: (result) => print('Scanned: ${result.rawValue}'),
    );
    _controller.initialize();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ListenableBuilder(
      listenable: _controller,
      builder: (context, _) {
        return Scaffold(
          body: Stack(
            children: [
              // 2. Unopinionated camera feed widget
              ScannerCameraPreview(controller: _controller),

              // 3. Your custom reticle overlay & screen design!
              Center(
                child: Container(
                  width: 260,
                  height: 260,
                  decoration: BoxDecoration(
                    border: Border.all(color: Colors.cyan, width: 3),
                    borderRadius: BorderRadius.circular(16),
                  ),
                ),
              ),

              // 4. Your custom buttons & controls
              Positioned(
                bottom: 30,
                left: 20,
                right: 20,
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                  children: [
                    IconButton(
                      icon: Icon(_controller.isFlashOn ? Icons.flash_on : Icons.flash_off),
                      onPressed: () => _controller.toggleFlash(),
                    ),
                    ElevatedButton(
                      onPressed: () => _controller.setMode(ScanMode.barcode),
                      child: const Text('Barcode Mode'),
                    ),
                    IconButton(
                      icon: const Icon(Icons.photo_library),
                      onPressed: () => _controller.pickAndScanImage(),
                    ),
                  ],
                ),
              ),
            ],
          ),
        );
      },
    );
  }
}

Or use UniversalScannerView.builder(...) for total layout customization:

UniversalScannerView.builder(
  builder: (context, controller, cameraPreview) {
    return Scaffold(
      body: Stack(
        children: [
          cameraPreview, // Raw camera feed
          MyCustomFrameWidget(),
          MyCustomButtons(controller: controller),
        ],
      ),
    );
  },
);

Pre-packaged Visual Themes

• Built-in Presets: ScannerUiTheme.dark, ScannerUiTheme.cyan, ScannerUiTheme.emerald, ScannerUiTheme.amber.
• Custom Color Overrides: Reticle corners, border outlines, laser beam colors, viewfinder mask opacity, and background containers.
• Dimensional Controls: Custom reticle corner radii, stroke widths, bracket lengths, and element toggles.

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🌟 Key Features

📄 1. Multi-Document & Vision AI Engines (10 Scan Modes)

Mode	Target Document / Symbology	Parsing & Validation Pipeline
Aadhaar Card	Indian Aadhaar Secure QR & Front OCR	Verhoeff D10 checksum + XML/OCR text extractor + India Post Pincode API
PAN Card	Income Tax Permanent Account Number	10-char structural regex + Surname decoding + Fuzzy OCR space/letter repair
Passport MRZ	Passports & ICAO Doc 9303 MRZ Lines	2-line & 3-line MRZ parser + 7-3-1 weight check digits + Country metadata
Driving License	AAMVA PDF417 Barcode & State DL OCR	AAMVA 3-character field decoding + Expiration & issue date extractors
Vehicle VIN	17-character ISO 3779 Vehicle Number	Transposition check digit + WMI manufacturer decode + Live NHTSA API
1D Barcode	EAN-13, EAN-8, UPC-A, Code39, Code128	Retail barcode parser + Open Food Facts & UPC Item DB REST lookups
QR Code	URLs, WiFi, VCard, Geo, UPI QR	UPI payment extractor (VPA, GPay/PhonePe, SBI, MCC) + Web metadata API
PDF417	Stacked 2D Barcodes	High-density ID card & boarding pass parsing
Text OCR	Print & Handwriting Recognition	General on-device text block & line extraction
Face AI	Face Landmark & Pose Detection	Eye landmark mesh circles + Face oval reticle guide

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🛡️ 2. Selective Access Control (Feature Flags)

Selectively enable or restrict scanner modes based on feature flags or explicit mode lists:

// Enable only Aadhaar and PAN Card scanning
UniversalScannerView(
  enableAadhaar: true,
  enablePan: true,
  enablePassport: false,
  enableDrivingLicense: false,
  enableQr: false,
)

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⚡ 3. Binary Size & Performance Optimization

• Unbundled Google Play Services ML Models: Downloads vision models on demand via Google Play Services (com.google.mlkit.vision.DEPENDENCIES), saving ~25–35 MB in APK download size.
• R8 Bytecode & Resource Shrinking: Automated bytecode minification and resource stripping via ProGuard optimization rules.
• Zero Unused Dependencies: Streamlined transitive dependencies for minimal package footprint.

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🚀 Getting Started

Installation

Add scannerpro to your pubspec.yaml:

dependencies:
  scannerpro: ^1.1.3

Run flutter pub get.

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💻 Usage Examples

1. Simple Scanner Widget

import 'package:flutter/material.dart';
import 'package:scannerpro/scannerpro.dart';

class MyScannerScreen extends StatelessWidget {
  const MyScannerScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: UniversalScannerView(
        initialMode: ScanMode.qr,
        onResultDetected: (ScanResult result) {
          debugPrint('Scanned Mode: ${result.mode.title}');
          debugPrint('Parsed Data: ${result.fields}');
          debugPrint('Validity: ${result.isValid}');
        },
      ),
    );
  }
}

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2. Custom UI Design & Theme Presets

UniversalScannerView(
  // Use preset theme:
  theme: ScannerUiTheme.emerald,

  // Or override individual design parameters:
  primaryAccentColor: const Color(0xFFFF0055), // Custom Neon Pink
  backgroundColor: const Color(0xFF10141D),
  overlayMaskColor: Colors.black.withOpacity(0.75),
  laserBeamColor: const Color(0xFFFFD600),
  showModeBadge: true,
  showGuideBox: true,
  showLaserBeam: true,
)

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3. Feature-Flagged Document Access Control

UniversalScannerView(
  initialMode: ScanMode.aadhaar,
  enableAadhaar: true,
  enablePan: true,
  enablePassport: true,
  enableDrivingLicense: false,
  enableQr: false,
  enableBarcode: false,
)

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4. Direct Standalone Parser APIs

You can also use standalone mathematical parsers directly without opening the camera view:

import 'package:scannerpro/scannerpro.dart';

// Parse Indian Aadhaar Card QR/OCR text:
final aadhaarResult = AadhaarParser.parse(rawTextOrXml);
print('UID Checksum Valid: ${aadhaarResult.isValid}');

// Parse Income Tax PAN Card text:
final panResult = PanCardParser.parse('ABCPE1234F');
print('Taxpayer Category: ${panResult.fields['Taxpayer Category']}');

// Parse Passport MRZ string:
final passportResult = MrzPassportParser.parse(mrzLines);
print('Passport Number: ${passportResult.fields['Passport Number']}');

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🔧 Platform Setup

Android Setup (android/app/src/main/AndroidManifest.xml)

Add camera permissions and the unbundled ML Kit vision model downloader:

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application ...>
        <!-- Unbundled ML Kit vision models (Saves ~30 MB APK size) -->
        <meta-data
            android:name="com.google.mlkit.vision.DEPENDENCIES"
            android:value="barcode,ocr,face" />
    </application>
</manifest>

iOS Setup (ios/Runner/Info.plist)

Add the camera usage permission string:

<key>NSCameraUsageDescription</key>
<string>This app requires camera access to scan documents, QR codes, and barcodes.</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>This app requires photo library access to select document images for scanning.</string>

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📄 License

This project is licensed under the OSI-Approved MIT License.