Number Flip Ledger

import { View } from "react-native";import Animated from "react-native-reanimated";import type { NumberFlipLedgerBaseProps } from "../types";import { useNumberFlipLedger } from "../use-ledger";import type { SlotsToClasses } from "#shared/types/slots";import {  numberFlipLedgerVariants,  type NumberFlipLedgerSlot,} from "./variants";export type NumberFlipLedgerProps = NumberFlipLedgerBaseProps & {  className?: string;  classNames?: SlotsToClasses<NumberFlipLedgerSlot>;  textClassName?: string;};export function NumberFlipLedger({  accessibilityLabel,  characterWidth,  className,  classNames,  digitHeight,  direction,  duration,  fontSize,  formatValue,  gap,  textClassName,  value,}: NumberFlipLedgerProps) {  const {    characters,    digitHeight: resolvedDigitHeight,    entering,    exiting,    fontSize: resolvedFontSize,    formattedValue,    gap: resolvedGap,    resolvedCharacterWidth,  } = useNumberFlipLedger({    characterWidth,    digitHeight,    direction,    duration,    fontSize,    formatValue,    gap,    value,  });  const {    character: characterSlot,    container,    text,  } = numberFlipLedgerVariants();  return (    <View      accessibilityLabel={accessibilityLabel ?? formattedValue}      accessibilityRole="text"      accessible      className={container({        className: [className, classNames?.container],      })}      style={{ gap: resolvedGap }}    >      {characters.map((character, index) => (        <View          className={characterSlot({            className: classNames?.character,          })}          key={index}          style={{            height: resolvedDigitHeight,            width: resolvedCharacterWidth,          }}        >          <Animated.Text            className={text({              className: [                textClassName,                classNames?.text,              ],            })}            entering={entering}            exiting={exiting}            key={character}            numberOfLines={1}            style={{              fontSize: resolvedFontSize,              lineHeight: resolvedDigitHeight,            }}          >            {character}          </Animated.Text>        </View>      ))}    </View>  );}

import { tv } from "tailwind-variants";export const numberFlipLedgerSlots = {  character: "items-center justify-center overflow-hidden",  container: "flex-row items-center",  text:    "absolute inset-x-0 text-center font-extrabold text-[#171713] [font-variant:tabular-nums]",} as const;export type NumberFlipLedgerSlot =  keyof typeof numberFlipLedgerSlots;export const numberFlipLedgerVariants = tv({  slots: numberFlipLedgerSlots,});

import { useMemo } from "react";import {  Easing,  Keyframe,  useReducedMotion,} from "react-native-reanimated";import { NUMBER_FLIP_LEDGER_CONFIG } from "./config";import type { NumberFlipLedgerBaseProps } from "./types";export function useNumberFlipLedger({  characterWidth,  digitHeight = NUMBER_FLIP_LEDGER_CONFIG.defaultDigitHeight,  direction = "up",  duration = NUMBER_FLIP_LEDGER_CONFIG.defaultDuration,  fontSize = NUMBER_FLIP_LEDGER_CONFIG.defaultFontSize,  formatValue,  gap = NUMBER_FLIP_LEDGER_CONFIG.defaultGap,  value,}: Omit<NumberFlipLedgerBaseProps, "accessibilityLabel">) {  if (characterWidth !== undefined && characterWidth <= 0) {    throw new Error(      "NumberFlipLedger requires characterWidth to be greater than zero.",    );  }  if (digitHeight <= 0) {    throw new Error(      "NumberFlipLedger requires digitHeight to be greater than zero.",    );  }  if (duration <= 0) {    throw new Error(      "NumberFlipLedger requires duration to be greater than zero.",    );  }  if (fontSize <= 0) {    throw new Error(      "NumberFlipLedger requires fontSize to be greater than zero.",    );  }  if (gap < 0) {    throw new Error(      "NumberFlipLedger requires gap to be zero or greater.",    );  }  const reducedMotion = useReducedMotion();  const formattedValue = formatValue?.(value) ?? String(value);  const characters = Array.from(formattedValue);  const resolvedCharacterWidth =    characterWidth ??    fontSize * NUMBER_FLIP_LEDGER_CONFIG.characterWidthRatio;  const transitions = useMemo(() => {    if (reducedMotion) {      return {        entering: undefined,        exiting: undefined,      };    }    const directionMultiplier = direction === "up" ? 1 : -1;    const travel = digitHeight * 0.72 * directionMultiplier;    const entering = new Keyframe({        0: {          opacity: 0,          transform: [            { translateY: travel },            { scaleY: 0.82 },          ],        },        72: {          opacity: 1,          transform: [            { translateY: -travel * 0.06 },            { scaleY: 1.03 },          ],          easing: Easing.out(Easing.cubic),        },        100: {          opacity: 1,          transform: [            { translateY: 0 },            { scaleY: 1 },          ],        },      })      .delay(duration * 0.35)      .duration(duration * 0.65);    const exiting = new Keyframe({        0: {          opacity: 1,          transform: [            { translateY: 0 },            { scaleY: 1 },          ],        },        100: {          opacity: 0,          transform: [            { translateY: -travel },            { scaleY: 0.82 },          ],          easing: Easing.in(Easing.cubic),        },      }).duration(duration * 0.45);    return {      entering,      exiting,    };  }, [digitHeight, direction, duration, reducedMotion]);  return {    characters,    digitHeight,    fontSize,    formattedValue,    gap,    resolvedCharacterWidth,    ...transitions,  };}