react-native-digital-ink

React Native module for using Digital Ink Recognition of Google ML Kit

Installation

npm install react-native-digital-ink

Usage

import * as React from 'react';
import { useRef } from 'react';
import { StyleSheet, Text, TouchableOpacity, View } from 'react-native';
import DigitalInk, { DigitalInkView } from 'react-native-digital-ink';

export default function App() {
  const [result, setResult] = React.useState<void>();
  const [status, setStatus] = React.useState(true);
  const digitalInkView1: any = useRef();

  const onClick = (e: any) => {
    setStatus(!status);
    console.log('onClick', e.nativeEvent);
  };

  const onDrawStart = (e: any) => {
    console.log('onDrawStart', e.nativeEvent);
  };

  const onDrawEnd = (e: any) => {
    console.log('onDrawEnd', e.nativeEvent);
  };

  React.useEffect(() => {
    DigitalInk.show('Hello', DigitalInk.SHORT);
  }, []);

  const clearDigitalInkViewHandler = async () => {
    const languageTag = 'af';
    const result = await DigitalInk.downloadModel(languageTag);
    setResult(result);
  };

  return (
    <View style={styles.container}>
      <Text style={styles.resultText}>Result: {result}</Text>
      <DigitalInkView
        ref={digitalInkView1}
        status={status}
        onClick={onClick}
        onDrawStart={onDrawStart}
        onDrawEnd={onDrawEnd}
        style={{
          width: '90%',
          height: 400,
          backgroundColor: '#dcdcdc',
        }}
      />
      <TouchableOpacity
        style={styles.button}
        onPress={clearDigitalInkViewHandler}
      >
        <Text style={styles.buttonText}>Recognize2</Text>
      </TouchableOpacity>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  button: {
    width: '80%',
    height: 45,
    marginTop: 20,
    backgroundColor: '#0387AC',
    borderRadius: 15,
    justifyContent: 'center',
    alignItems: 'center',
  },
  buttonText: {
    fontSize: 20,
    color: 'white',
  },
  resultText: {
    fontSize: 30,
    marginBottom: 15,
  },
});

Methods

Name	Description	Default
void show(String message, int duration)	Shows a toast contains given the text
promise clear()	Clears the Drawing pad. This returns a promise handler so you can use await here.
Array <Language> getLanguages()	Returns languages which are supported in this Drawing Pad. This returns a promise handler so you can use await here.
Array <Model> getgetDownloadedModelLanguagesLanguages()	Returns models which are supported in this Drawing Pad. This returns a promise handler so you can use await here.
void downloadModel(String languageTag)	Downloads a specified language to be used to recognize drawings. This returns a promise handler so you can use await here.
void recognize()	Anaylizes and recognizes the current drawings in the pad. This returns a promise handler so you can use await here.
void deleteDownloadedModel()	Deletes the downloaded model. This returns a promise handler so you can use await here.

Events

Name	Description	Default
void onDownloadedModelsChanged(Set<String> downloadedLanguageTags)	Fires when it's changed downloading models. This is usefule when you need to implement a progress bar of downloaing models.

License

MIT