index.js

import React from 'react';
import { requireNativeComponent, NativeModules, View, Platform, DeviceEventEmitter } from 'react-native';
import PropTypes from 'prop-types';

const RNPdfScanner = requireNativeComponent('RNPdfScanner', PdfScanner);
const CameraManager = NativeModules.RNPdfScannerManager || {};

class PdfScanner extends React.Component {

  static defaultProps = {
    onPictureTaken: ()=>{},
    onProcessing: ()=>{},
  }

  sendOnPictureTakenEvent(event) {
    return this.props.onPictureTaken(event.nativeEvent);
  }

  sendOnRectanleDetectEvent(event) {
    if (!this.props.onRectangleDetect) return null;
    return this.props.onRectangleDetect(event.nativeEvent);
  }

  getImageQuality() {
    if (!this.props.quality) return 0.8;
    if (this.props.quality > 1) return 1;
    if (this.props.quality < 0.1) return 0.1;
    return this.props.quality;
  }

  componentWillMount(){
    if (Platform.OS === 'android') {
      const { onPictureTaken, onProcessing } = this.props;
      DeviceEventEmitter.addListener('onPictureTaken', onPictureTaken);
      DeviceEventEmitter.addListener('onProcessingChange', onProcessing);
    }
  }
  
  componentWillUnmount(){
    if (Platform.OS === 'android') {
      const { onPictureTaken, onProcessing } = this.props;
      DeviceEventEmitter.removeListener('onPictureTaken', onPictureTaken);
      DeviceEventEmitter.removeListener('onProcessingChange', onProcessing);
    }
  }

  capture() {
    // NativeModules.RNPdfScannerManager.capture();
    CameraManager.capture();
  }

  render() {
    return (
      <RNPdfScanner
        {...this.props}
        onPictureTaken={this.sendOnPictureTakenEvent.bind(this)}
        onRectangleDetect={this.sendOnRectanleDetectEvent.bind(this)}
        useFrontCam={this.props.useFrontCam||false}
        brightness={this.props.brightness||0}
        saturation={this.props.saturation||1}
        contrast={this.props.contrast||1}
        quality={this.getImageQuality()}
        detectionCountBeforeCapture={this.props.detectionCountBeforeCapture||5}
        detectionRefreshRateInMS={this.props.detectionRefreshRateInMS||50}
      />
    );
  }
}

PdfScanner.propTypes = {
  onPictureTaken: PropTypes.func,
  onRectangleDetect: PropTypes.func,
  overlayColor: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
  enableTorch: PropTypes.bool,
  useFrontCam: PropTypes.bool,
  saturation: PropTypes.number,
  brightness: PropTypes.number,
  contrast: PropTypes.number,
  detectionCountBeforeCapture: PropTypes.number,
  detectionRefreshRateInMS: PropTypes.number,
  quality: PropTypes.number,

  documentAnimation : PropTypes.bool,
  noGrayScale: PropTypes.bool,
  manualOnly: PropTypes.bool,
    ...View.propTypes // include the default view properties
};

export default PdfScanner;