src/components/ui/checkbox.tsx import React, { useEffect, useRef, useState } from 'react' ;import { Animated, Pressable, StyleSheet, Text, View, type StyleProp, type ViewStyle } from 'react-native' ;import Svg, { Path } from 'react-native-svg' ; import { alpha, useKit } from '@/lib/kit' ; const AnimatedPath = Animated.createAnimatedComponent(Path);const CHECK = 'M5 12.5l4.5 4.5L19 7.5' ;const CHECK_LEN = 22 ; export interface CheckboxProps { checked?: boolean; defaultChecked?: boolean; onChange?: (checked: boolean) => void; label?: string; description?: string; /** Strike through the label when checked (to-do list style). */ strike?: boolean; size?: number; accent?: string; disabled?: boolean; /** 'square' (default ) or 'circle' . */ shape?: 'square' | 'circle' ; style?: StyleProp<ViewStyle >; } /** Checkbox whose tick draws itself in, with a squishy press and a burst ring. */ export function Checkbox({ checked, defaultChecked = false , onChange, label, description, strike, size = 24 , accent, disabled, shape = 'square' , style, }: CheckboxProps) { const { colors, radius, font } = useKit(); const ff = font.family ? { fontFamily: font.family } : null ; const tint = accent ?? colors.accent; const corner = shape === 'circle' ? size / 2 : Math.min(size / 2 , radius.sm + 1 ); const [inner, setInner] = useState(defaultChecked); const on = checked ?? inner; const progress = useRef(new Animated.Value(on ? 1 : 0 )).current; // fill + tick (JS: drives svg + colour) const press = useRef(new Animated.Value(1 )).current; const burst = useRef(new Animated.Value(0 )).current; useEffect(() => { Animated.spring(progress, { toValue: on ? 1 : 0 , useNativeDriver: false , speed: 14 , bounciness: 0 }).start(); if (on) { burst.setValue(0 ); Animated.timing(burst, { toValue: 1 , duration: 450 , useNativeDriver: true }).start(); } }, [on, progress, burst]); const toggle = () => { if (checked === undefined ) setInner(!on); onChange?.(!on); }; const border = colors.input; const fg = colors.foreground; const muted = colors.mutedForeground; return ( <Pressable accessibilityRole ="checkbox" accessibilityState ={{ checked: on, disabled }} disabled ={disabled} onPress ={toggle} onPressIn ={() => Animated.spring(press, { toValue: 0.82 , useNativeDriver: true , speed: 50 }).start()} onPressOut ={() => Animated.spring(press, { toValue: 1 , useNativeDriver: true , speed: 20 , bounciness: 0 }).start()} style ={[styles.row, { opacity: disabled ? 0.5 : 1 }, style]} > <Animated.View style ={{ transform: [{ scale: press }] }}> <Animated.View pointerEvents ="none" style ={[ styles.burst, { width: size, height: size, borderRadius: corner, borderColor: tint, opacity: burst.interpolate({ inputRange: [0 , 0.2 , 1 ], outputRange: [0 , 0.6 , 0 ] }), transform: [{ scale: burst.interpolate({ inputRange: [0 , 1 ], outputRange: [1 , 1.9 ] }) }], }, ]} /> <Animated.View style ={[ styles.box, { width: size, height: size, borderRadius: corner, borderColor: progress.interpolate({ inputRange: [0 , 1 ], outputRange: [border, tint] }), backgroundColor: progress.interpolate({ inputRange: [0 , 1 ], outputRange: [alpha(tint, 0 ), tint] }), }, ]} > <Svg width ={size * 0.8 } height ={size * 0.8 } viewBox ="0 0 24 24" > <AnimatedPath d ={CHECK} stroke ="#fff" strokeWidth ={3 } strokeLinecap ="round" strokeLinejoin ="round" fill ="none" strokeDasharray ={CHECK_LEN} strokeDashoffset ={progress.interpolate({ inputRange: [0 , 1 ], outputRange: [CHECK_LEN, 0 ], extrapolate: 'clamp' }) as unknown as number} /> </Svg > </Animated.View > </Animated.View > {label ? ( <View style ={styles.text}> <View style ={styles.labelBox}> <Animated.Text style ={[styles.label, ff, { color: progress.interpolate({ inputRange: [0 , 1 ], outputRange: [fg, strike ? muted : fg] }) }]}> {label} </Animated.Text > {strike ? ( <Animated.View style ={[ styles.strike, { backgroundColor: muted, width: progress.interpolate({ inputRange: [0 , 1 ], outputRange: ['0%' , '100%' ], extrapolate: 'clamp' }) }, ]} /> ) : null } </View > {description ? <Text style ={[styles.description, ff, { color: muted }]}>{description}</Text > : null } </View > ) : null } </Pressable > ); } const styles = StyleSheet.create({ row: { flexDirection: 'row' , alignItems: 'flex-start' , gap: 12 }, box: { borderWidth: 2 , alignItems: 'center' , justifyContent: 'center' }, burst: { position: 'absolute' , borderWidth: 2 }, text: { flex: 1 , paddingTop: 1 }, labelBox: { alignSelf: 'flex-start' }, label: { fontSize: 15.5 , fontWeight: '400' }, strike: { position: 'absolute' , left: 0 , top: '52%' , height: 1.5 , borderRadius: 1 }, description: { fontSize: 13 , marginTop: 2 , lineHeight: 18 }, }); 
