RN accessibility actions

/**
 * Demo RN 0.61 app with accessibility actions.
 * - Add extra content when TalkBack control activated by TalkBack.
 *
 * @format
 * @flow
 */

import React from 'react';
import {useState} from 'react';
import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
  TouchableHighlight,
  Alert,
} from 'react-native';

import {
  Header,
  LearnMoreLinks,
  Colors,
  DebugInstructions,
  ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';

const App: () => React$Node = () => {
  const [isControlsVisibleTalkBack, setControlsVisibleTalkBack] = useState(
    false,
  );
  return (
    <>
      <StatusBar barStyle="dark-content" />
      <SafeAreaView>
        <ScrollView
          contentInsetAdjustmentBehavior="automatic"
          style={styles.scrollView}>
          <Header />
          {global.HermesInternal == null ? null : (
            <View style={styles.engine}>
              <Text style={styles.footer}>Engine: Hermes</Text>
            </View>
          )}
          <View style={styles.body}>
            <TouchableHighlight
              style={styles.sectionContainer}
              accessible={true}
              accessibilityActions={[{name: 'activate', label: 'activate'}]}
              onAccessibilityAction={event => {
                switch (event.nativeEvent.actionName) {
                  case 'activate':
                    Alert.alert('Hi!');
                    setControlsVisibleTalkBack(true);
                    break;
                }
              }}
              onPress={() => {
                Alert.alert('Hi!');
              }}>
              <Text style={styles.sectionTitle}>Hello.</Text>
            </TouchableHighlight>

            <View style={styles.sectionContainer}>
              {isControlsVisibleTalkBack && (
                <View>
                  <Text>Controls enabled via TalkBack!</Text>
                  <TouchableHighlight
                    onPress={() => {
                      setControlsVisibleTalkBack(false);
                    }}>
                    <Text style={styles.sectionTitle}>Hide controls</Text>
                  </TouchableHighlight>
                </View>
              )}
            </View>
          </View>
        </ScrollView>
      </SafeAreaView>
    </>
  );
};

const styles = StyleSheet.create({
  scrollView: {
    backgroundColor: Colors.lighter,
  },
  engine: {
    position: 'absolute',
    right: 0,
  },
  body: {
    backgroundColor: Colors.white,
  },
  sectionContainer: {
    marginTop: 32,
    paddingHorizontal: 24,
  },
  sectionTitle: {
    fontSize: 24,
    fontWeight: '600',
    color: Colors.black,
  },
  sectionDescription: {
    marginTop: 8,
    fontSize: 18,
    fontWeight: '400',
    color: Colors.dark,
  },
  highlight: {
    fontWeight: '700',
  },
  footer: {
    color: Colors.dark,
    fontSize: 12,
    fontWeight: '600',
    padding: 4,
    paddingRight: 12,
    textAlign: 'right',
  },
});

export default App;