@react-navigation/bottom-tabs/lib/module/views/Badge.js

Bottom tab navigator following iOS design guidelines

"use strict";

import { useTheme } from '@react-navigation/native';
import color from 'color';
import * as React from 'react';
import { Animated, Platform, StyleSheet } from 'react-native';
import { jsx as _jsx } from "react/jsx-runtime";
const useNativeDriver = Platform.OS !== 'web';
export function Badge({
  children,
  style,
  visible = true,
  size = 18,
  ...rest
}) {
  const [opacity] = React.useState(() => new Animated.Value(visible ? 1 : 0));
  const [rendered, setRendered] = React.useState(visible);
  const {
    colors,
    fonts
  } = useTheme();
  React.useEffect(() => {
    if (!rendered) {
      return;
    }
    Animated.timing(opacity, {
      toValue: visible ? 1 : 0,
      duration: 150,
      useNativeDriver
    }).start(({
      finished
    }) => {
      if (finished && !visible) {
        setRendered(false);
      }
    });
    return () => opacity.stopAnimation();
  }, [opacity, rendered, visible]);
  if (!rendered) {
    if (visible) {
      setRendered(true);
    } else {
      return null;
    }
  }

  // @ts-expect-error: backgroundColor definitely exists
  const {
    backgroundColor = colors.notification,
    ...restStyle
  } = StyleSheet.flatten(style) || {};
  const textColor = color(backgroundColor).isLight() ? 'black' : 'white';
  const borderRadius = size / 2;
  const fontSize = Math.floor(size * 3 / 4);
  return /*#__PURE__*/_jsx(Animated.Text, {
    numberOfLines: 1,
    style: [{
      transform: [{
        scale: opacity.interpolate({
          inputRange: [0, 1],
          outputRange: [0.5, 1]
        })
      }],
      color: textColor,
      lineHeight: size - 1,
      height: size,
      minWidth: size,
      opacity,
      backgroundColor,
      fontSize,
      borderRadius
    }, fonts.regular, styles.container, restStyle],
    ...rest,
    children: children
  });
}
const styles = StyleSheet.create({
  container: {
    alignSelf: 'flex-end',
    textAlign: 'center',
    paddingHorizontal: 4,
    overflow: 'hidden'
  }
});
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