DS Boyce
51 lines
1.1 KiB
TypeScript
51 lines
1.1 KiB
TypeScript
import {createContext, useContext, useMemo} from 'react'
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import {type SharedValue} from 'react-native-reanimated'
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import {IS_NATIVE} from '#/env'
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export const PagerHeaderContext = createContext<{
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scrollY: SharedValue<number>
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headerHeight: number
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} | null>(null)
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PagerHeaderContext.displayName = 'PagerHeaderContext'
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/**
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* Passes information about the scroll position and header height down via
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* context for the pager header to consume.
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*
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* @platform ios, android
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*/
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export function PagerHeaderProvider({
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scrollY,
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headerHeight,
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children,
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}: {
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scrollY: SharedValue<number>
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headerHeight: number
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children: React.ReactNode
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}) {
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const value = useMemo(
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() => ({scrollY, headerHeight}),
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[scrollY, headerHeight],
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)
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return (
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<PagerHeaderContext.Provider value={value}>
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{children}
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</PagerHeaderContext.Provider>
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)
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}
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export function usePagerHeaderContext() {
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const ctx = useContext(PagerHeaderContext)
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if (IS_NATIVE) {
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if (!ctx) {
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throw new Error(
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'usePagerHeaderContext must be used within a HeaderProvider',
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)
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}
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return ctx
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} else {
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return null
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}
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}
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