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hardened bluesky app fork with microcosm
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7.1 kB · 287 lines
TSX
at main
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import {useHaptics} from '#/lib/haptics'import {useNonReactiveCallback} from '#/lib/hooks/useNonReactiveCallback'import {atoms as a, native, platform, useTheme} from '#/alf'import { Button, type ButtonProps, ButtonText, type ButtonTextProps,} from '../Button'
const InternalContext = createContext<{ type: 'tabs' | 'radio' size: 'small' | 'large' selectedValue: string selectedPosition: {width: number; x: number} | null onSelectValue: ( value: string, position: {width: number; x: number} | null, ) => void updatePosition: (position: {width: number; x: number}) => void} | null>(null)
/** * Segmented control component. * * @example * ```tsx * <SegmentedControl.Root value={value} onChange={setValue}> * <SegmentedControl.Item value="one"> * <SegmentedControl.ItemText value="one"> * One * </SegmentedControl.ItemText> * </SegmentedControl.Item> * <SegmentedControl.Item value="two"> * <SegmentedControl.ItemText value="two"> * Two * </SegmentedControl.ItemText> * </SegmentedControl.Item> * </SegmentedControl.Root> * ``` */export function Root<T extends string>({ label, type = 'radio', size = 'large', value, onChange, children, style, accessibilityHint,}: { label: string type: 'tabs' | 'radio' size?: 'small' | 'large' value: T onChange: (value: T) => void children: React.ReactNode style?: StyleProp<ViewStyle> accessibilityHint?: string}) { const t = useTheme() const [selectedPosition, setSelectedPosition] = useState<{ width: number x: number } | null>(null)
const contextValue = useMemo(() => { return { type, size, selectedValue: value, selectedPosition, onSelectValue: ( val: string, position: {width: number; x: number} | null, ) => { onChange(val as T) if (position) setSelectedPosition(position) }, updatePosition: (position: {width: number; x: number}) => { setSelectedPosition(currPos => { if ( currPos && currPos.width === position.width && currPos.x === position.x ) { return currPos } return position }) }, } }, [value, selectedPosition, setSelectedPosition, onChange, type, size])
return ( <View accessibilityLabel={label} accessibilityHint={accessibilityHint ?? ''} style={[ a.w_full, a.flex_1, a.relative, a.flex_row, t.atoms.bg_contrast_50, {borderRadius: 14}, a.curve_continuous, a.p_xs, style, ]} role={type === 'tabs' ? 'tablist' : 'radiogroup'}> {selectedPosition !== null && ( <Slider x={selectedPosition.x} width={selectedPosition.width} /> )} <InternalContext.Provider value={contextValue}> {children} </InternalContext.Provider> </View> )}
const InternalItemContext = createContext<{ active: boolean pressed: boolean hovered: boolean focused: boolean} | null>(null)
export function Item({ value, style, children, onPress: onPressProp, ...props}: {value: string; children: React.ReactNode} & Omit<ButtonProps, 'children'>) { const playHaptic = useHaptics() const [position, setPosition] = useState<{x: number; width: number} | null>( null, )
const ctx = useContext(InternalContext) if (!ctx) throw new Error( 'SegmentedControl.Item must be used within a SegmentedControl.Root', )
const active = ctx.selectedValue === value
// update position if change was external, and not due to onPress const needsUpdate = active && position && (ctx.selectedPosition?.x !== position.x || ctx.selectedPosition?.width !== position.width)
// can't wait for `useEffectEvent` const update = useNonReactiveCallback(() => { if (position) ctx.updatePosition(position) })
useLayoutEffect(() => { if (needsUpdate) { update() } }, [needsUpdate, update])
const onPress = useCallback( (evt: any) => { playHaptic('Light') ctx.onSelectValue(value, position) onPressProp?.(evt) }, [ctx, value, position, onPressProp, playHaptic], )
return ( <View style={[a.flex_1, a.flex_row]} onLayout={evt => { const measuredPosition = { x: evt.nativeEvent.layout.x, width: evt.nativeEvent.layout.width, } if (!ctx.selectedPosition && active) { ctx.onSelectValue(value, measuredPosition) } setPosition(measuredPosition) }}> <Button {...props} onPress={onPress} role={ctx.type === 'tabs' ? 'tab' : 'radio'} accessibilityState={{selected: active}} style={[ a.flex_1, a.bg_transparent, a.px_sm, a.py_xs, {minHeight: ctx.size === 'large' ? 40 : 32}, style, ]}> {({pressed, hovered, focused}) => ( <InternalItemContext.Provider value={{active, pressed, hovered, focused}}> {children} </InternalItemContext.Provider> )} </Button> </View> )}
export function ItemText({style, ...props}: ButtonTextProps) { const t = useTheme() const ctx = useContext(InternalItemContext) if (!ctx) throw new Error( 'SegmentedControl.ItemText must be used within a SegmentedControl.Item', ) return ( <ButtonText {...props} style={[ a.text_center, a.text_md, a.font_medium, a.px_xs, ctx.active ? t.atoms.text : ctx.focused || ctx.hovered || ctx.pressed ? t.atoms.text_contrast_medium : t.atoms.text_contrast_low, style, ]} /> )}
function Slider({x, width}: {x: number; width: number}) { const t = useTheme()
return ( <Animated.View layout={native(LinearTransition.easing(Easing.out(Easing.exp)))} style={[ a.absolute, a.curve_continuous, t.atoms.bg, { top: 4, bottom: 4, left: 0, width, borderRadius: 10, }, // TODO: new arch supports boxShadow on native // in the meantime this is an attempt to get close platform({ web: { boxShadow: '0px 2px 4px 0px #0000000D', }, ios: { shadowColor: '#000', shadowOffset: {width: 0, height: 2}, shadowOpacity: 0x0d / 0xff, shadowRadius: 4, }, android: {elevation: 0.25}, }), platform({ native: [{left: x}], web: [{transform: [{translateX: x}]}, a.transition_transform], }), ]} /> )}