@hmscore/react-native-hms-mlimage/example/src/HmsImageRelatedServices/SceneDetectionLive.js

React Native HMS ML Image Kit

/*
 * Copyright 2023-2024. Huawei Technologies Co., Ltd. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License")
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import React from 'react';
import {
  Text,
  View,
  ScrollView,
  TextInput,
  TouchableOpacity,
  NativeEventEmitter,
  Dimensions,
} from 'react-native';
import { createLensEngine, runWithView, close, release, doZoom, setApiKey } from '../HmsOtherServices/Helper';
import SurfaceView, { HMSLensEngine } from '@hmscore/react-native-hms-mlimage';
import { styles } from '../Styles';

export default class SceneDetectionLive extends React.Component {

  componentDidMount() {

    this.eventEmitter = new NativeEventEmitter(HMSLensEngine);

    this.eventEmitter.addListener(HMSLensEngine.LENS_SURFACE_ON_CREATED, (event) => {
      createLensEngine(
        6,
        { confidence: 0.5 }
      );
    });

    this.eventEmitter.addListener(HMSLensEngine.LENS_SURFACE_ON_CHANGED, (event) => {
      console.log(event);
    });

    this.eventEmitter.addListener(HMSLensEngine.LENS_SURFACE_ON_DESTROY, (event) => {
      console.log(event);
    });

    this.eventEmitter.addListener(HMSLensEngine.SCENE_TRANSACTOR_ON_RESULT, (event) => {
      console.log(event);
      this.setState({ result: event.result.length + " scene results detected see console log" });
    });

    this.eventEmitter.addListener(HMSLensEngine.SCENE_TRANSACTOR_ON_DESTROY, (event) => {
      console.log(event);
    });

    this.dimensionsSubscription = Dimensions.addEventListener('change',  () => {
      this.state.isLensRun ? close().then(() => runWithView()) : null;
    });
  }

  componentWillUnmount() {
    this.eventEmitter.removeAllListeners(HMSLensEngine.LENS_SURFACE_ON_CREATED);
    this.eventEmitter.removeAllListeners(HMSLensEngine.LENS_SURFACE_ON_CHANGED);
    this.eventEmitter.removeAllListeners(HMSLensEngine.LENS_SURFACE_ON_DESTROY);
    this.eventEmitter.removeAllListeners(HMSLensEngine.SCENE_TRANSACTOR_ON_RESULT);
    this.eventEmitter.removeAllListeners(HMSLensEngine.SCENE_TRANSACTOR_ON_DESTROY);
    this.dimensionsSubscription?.remove();
    release();
    setApiKey();
  }

  constructor(props) {
    super(props);
    this.state = {
      isZoomed: false,
      isLensRun: false,
    };
  }

  render() {
    return (
      <ScrollView style={styles.bg}>
        <ScrollView style={{ width: '95%', height: 300, alignSelf: 'center' }}>
          <SurfaceView style={{ width: '95%', height: 300, alignSelf: 'center' }} />
        </ScrollView>
        <TextInput
          style={styles.customInput}
          value={this.state.result}
          placeholder="Recognition Result"
          multiline={true}
          scrollEnabled={false}
        />
        <View style={styles.basicButton}>
          <TouchableOpacity
            style={styles.startButton}
            onPress={() => runWithView().then(() => this.setState({ isLensRun: true }))}>
            <Text style={styles.startButtonLabel}> RUN LENS </Text>
          </TouchableOpacity>
        </View>
        <View style={styles.basicButton}>
          <TouchableOpacity
            style={styles.startButton}
            onPress={() => close().then(() => this.setState({ isLensRun: false, isZoomed: false }))}
            disabled={!this.state.isLensRun}>
            <Text style={styles.startButtonLabel}> CLOSE LENS </Text>
          </TouchableOpacity>
        </View>
        <View style={styles.basicButton}>
          <TouchableOpacity
            style={styles.startButton}
            onPress={() => this.state.isZoomed ? doZoom(0.0).then(() => this.setState({ isZoomed: false })) : doZoom(3.0).then(() => this.setState({ isZoomed: true }))}
            disabled={!this.state.isLensRun}>
            <Text style={styles.startButtonLabel}> {this.state.isZoomed ? 'ZOOM 0X' : 'ZOOM 3X'}  </Text>
          </TouchableOpacity>
        </View>
      </ScrollView>
    );
  }
}