subtracks/app/navigation/BottomTabBar.tsx

import React, { useState } from 'react'
import { Text, View, Pressable } from 'react-native'
import { BottomTabBarProps } from '@react-navigation/bottom-tabs'
import textStyles from '@app/styles/text'
import colors from '@app/styles/colors'
import FastImage from 'react-native-fast-image'
import NowPlayingBar from '@app/components/NowPlayingBar'

const icons: { [key: string]: any } = {
  home: {
    regular: require('@res/icons/home.png'),
    fill: require('@res/icons/home-fill.png'),
  },
  library: {
    regular: require('@res/icons/library.png'),
    fill: require('@res/icons/library-fill.png'),
  },
  search: {
    regular: require('@res/icons/search.png'),
    fill: require('@res/icons/search-fill.png'),
  },
  settings: {
    regular: require('@res/icons/settings.png'),
    fill: require('@res/icons/settings-fill.png'),
  },
}

const BottomTabButton: React.FC<{
  routeKey: string
  label: string
  name: string
  isFocused: boolean
  img: { regular: number; fill: number }
  navigation: any
}> = ({ routeKey, label, name, isFocused, img, navigation }) => {
  const [opacity, setOpacity] = useState(1)

  const onPress = () => {
    const event = navigation.emit({
      type: 'tabPress',
      target: routeKey,
      canPreventDefault: true,
    })

    if (!isFocused && !event.defaultPrevented) {
      navigation.navigate(name)
    }
  }

  return (
    <Pressable
      onPress={onPress}
      onPressIn={() => setOpacity(0.6)}
      onPressOut={() => setOpacity(1)}
      style={{
        alignItems: 'center',
        flex: 1,
        opacity,
      }}>
      <FastImage
        source={isFocused ? img.fill : img.regular}
        style={{
          height: 26,
          width: 26,
        }}
        tintColor={isFocused ? colors.text.primary : colors.text.secondary}
      />
      <Text
        style={{
          ...textStyles.xsmall,
          color: isFocused ? colors.text.primary : colors.text.secondary,
        }}>
        {label}
      </Text>
    </Pressable>
  )
}

const BottomTabBar: React.FC<BottomTabBarProps> = ({ state, descriptors, navigation }) => {
  return (
    <View>
      <NowPlayingBar />
      <View
        style={{
          height: 54,
          backgroundColor: colors.gradient.high,
          flexDirection: 'row',
          alignItems: 'center',
          justifyContent: 'space-around',
          paddingHorizontal: 28,
        }}>
        {state.routes.map((route, index) => {
          const { options } = descriptors[route.key] as any
          const label =
            options.tabBarLabel !== undefined
              ? (options.tabBarLabel as string)
              : options.title !== undefined
              ? options.title
              : route.name

          return (
            <BottomTabButton
              key={route.key}
              routeKey={route.key}
              label={label}
              name={route.name}
              isFocused={state.index === index}
              img={icons[options.icon]}
              navigation={navigation}
            />
          )
        })}
      </View>
    </View>
  )
}

export default BottomTabBar