TVFocusGuide

import React from 'react';
import {
  Dimensions,
  View,
  StyleSheet,
  TouchableHighlight,
  Text
} from 'react-native';
import {
  TVFocusGuideView
} from '@amazon-devices/react-native-kepler';

const screenHeight = Dimensions.get('window').height;
const scale = screenHeight / 1080;
const width = 200 * scale;
const height = 120 * scale;
const theme = {
  LinkColor: '#0984ffff',
  LabelColor: '#ffffffff',
  TertiarySystemFillColor: '#3085C3',
  BackgroundColor: '#0c0700ff'
};
const Button = React.forwardRef((props: $FlowFixMeProps, ref) => {
  const [focused, setFocused] = React.useState(false);
  return (
    <TouchableHighlight
      onPress={() => {
        if (props.onPress) {
          props.onPress();
        }
        console.log(`${props.label} in press`);
      }}
      onFocus={() => {
        if (props.onFocus) {
          props.onFocus();
        }
        console.log(`${props.label} in focus`);
        setFocused(true);
      }}
      onBlur={() => {
        if (props.onBlur) {
          props.onBlur();
        }
        console.log(`${props.label} in blur`);
        setFocused(false);
      }}
      style={focused ? styles.buttonStyleFocused : styles.buttonStyle}
      ref={ref}>
      <Text style={[{ color: theme.LinkColor }, styles.buttonText]}>
        {props.label}
      </Text>
    </TouchableHighlight>
  );
});

const ThemedView = (props: $FlowFixMeProps) => {
  return (
    <View style={[styles.buttonStyle, props.style]}>
      <Text style={[{ color: theme.LabelColor }, styles.buttonText]}>
        {props.label}
      </Text>
    </View>
  );
};

const TVFocusGuideExample = () => {
  const [destination, setDestination] = React.useState(null);
  const [destinationText, setDestinationText] = React.useState('');
  const destinations = destination?.current ? [destination?.current] : [];

  const buttonTopRight = React.useRef(null);
  const buttonBottomLeft = React.useRef(null);

  const rightButtonInFocusViewContainer = React.useRef(null);
  const containerDestinations = rightButtonInFocusViewContainer?.current
    ? [rightButtonInFocusViewContainer?.current]
    : [];

  const _setDestination = (o: Object, text: string) => {
    setDestination(o);
    setDestinationText(text);
  };

  return (
    <View
      style={[styles.container, { backgroundColor: theme.BackgroundColor }]}>
      <View style={styles.rowContainer}>
        <Button onPress={() => {}} label="左上" />
        <Button
          onPress={() => {}}
          onFocus={() => _setDestination(buttonBottomLeft, '左下')}
          ref={buttonTopRight}
          label="右上"
        />
        <ThemedView label={`フォーカスガイドは${destinationText}を指します`} />
        {/* @ts-expect-error */}
        <TVFocusGuideView
          style={styles.containerFocusGuide}
          destinations={containerDestinations}>
          <Button onPress={() => {}} label="ラップされたボタン1" />
          <Button onPress={() => {}} label="ラップされたボタン2" />
          <Button
            ref={rightButtonInFocusViewContainer}
            onPress={() => {}}
            label="ラップされたボタン3"
          />
        </TVFocusGuideView>
      </View>
      <View style={styles.rowContainer}>
        <Button
          onPress={() => {}}
          onFocus={() => _setDestination(buttonTopRight, '右上')}
          ref={buttonBottomLeft}
          label="左下"
        />
        <TVFocusGuideView
          style={[
            { backgroundColor: theme.TertiarySystemFillColor },
            styles.focusGuide
          ]}
          destinations={destinations}>
          <Text style={[{ color: theme.LabelColor }, styles.buttonText]}>
            フォーカスガイド
          </Text>
        </TVFocusGuideView>
        <ThemedView label="" />
        <ThemedView
          style={{
            width: width * 3
          }}
          label="Blue focus guide container above always points to button 3
                  if navigating from outside"
        />
      </View>
    </View>
  );
};

const marginSize = 20 * scale;
const styles = StyleSheet.create({
  container: {
    marginTop: -marginSize,
    height: screenHeight
  },
  rowContainer: {
    flexDirection: 'row',
    padding: 100 * scale
  },
  buttonText: {
    fontSize: 30 * scale
  },
  buttonStyle: {
    width,
    height,
    marginLeft: marginSize,
    marginRight: marginSize,
    marginTop: marginSize,
    marginBottom: marginSize
  },
  buttonStyleFocused: {
    opacity: 0.5,
    borderColor: 'white',
    borderWidth: 4,
    width,
    height,
    marginLeft: marginSize,
    marginRight: marginSize,
    marginTop: marginSize,
    marginBottom: marginSize
  },
  focusGuide: {
    width,
    height,
    marginLeft: marginSize,
    marginRight: marginSize,
    marginTop: marginSize,
    marginBottom: marginSize
  },
  containerFocusGuide: {
    backgroundColor: 'transparent',
    borderColor: 'blue',
    borderWidth: 2,
    flexDirection: 'row'
  }
});

export default TVFocusGuideExample;

setDestinations([ref1, ref2, ...]);

const TVApp = () => {
  return (
    <View>
      {/* @ts-expect-error */}
      <TVFocusGuideView>
        <Text>Hello World</Text>
      </TVFocusGuideView>
    </View>
  );
};