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* as React from 'react';\nimport { Animated, Keyboard, StyleSheet } from 'react-native';\nimport ViewPager, {\n PageScrollStateChangedNativeEvent,\n} from 'react-native-pager-view';\nimport useAnimatedValue from './useAnimatedValue';\nimport type {\n NavigationState,\n Route,\n Listener,\n EventEmitterProps,\n PagerProps,\n} from './types';\n\nconst AnimatedViewPager = Animated.createAnimatedComponent(ViewPager);\n\ntype Props<T extends Route> = PagerProps & {\n onIndexChange: (index: number) => void;\n navigationState: NavigationState<T>;\n children: (\n props: EventEmitterProps & {\n // Animated value which represents the state of current index\n // It can include fractional digits as it represents the intermediate value\n position: Animated.AnimatedInterpolation;\n // Function to actually render the content of the pager\n // The parent component takes care of rendering\n render: (children: React.ReactNode) => React.ReactNode;\n // Callback to call when switching the tab\n // The tab switch animation is performed even if the index in state is unchanged\n jumpTo: (key: string) => void;\n }\n ) => React.ReactElement;\n};\n\nexport default function PagerViewAdapter<T extends Route>({\n keyboardDismissMode = 'auto',\n swipeEnabled = true,\n navigationState,\n onIndexChange,\n onSwipeStart,\n onSwipeEnd,\n children,\n style,\n ...rest\n}: Props<T>) {\n const { index } = navigationState;\n\n const listenersRef = React.useRef<Listener[]>([]);\n\n const pagerRef = React.useRef<ViewPager>();\n const indexRef = React.useRef<number>(index);\n const navigationStateRef = React.useRef(navigationState);\n\n const position = useAnimatedValue(index);\n const offset = useAnimatedValue(0);\n\n React.useEffect(() => {\n navigationStateRef.current = navigationState;\n });\n\n const jumpTo = React.useCallback((key: string) => {\n const index = navigationStateRef.current.routes.findIndex(\n (route: { key: string }) => route.key === key\n );\n\n pagerRef.current?.setPage(index);\n }, []);\n\n React.useEffect(() => {\n if (keyboardDismissMode === 'auto') {\n Keyboard.dismiss();\n }\n\n if (indexRef.current !== index) {\n pagerRef.current?.setPage(index);\n }\n }, [keyboardDismissMode, index]);\n\n const onPageScrollStateChanged = (\n state: PageScrollStateChangedNativeEvent\n ) => {\n const { pageScrollState } = state.nativeEvent;\n\n switch (pageScrollState) {\n case 'idle':\n onSwipeEnd?.();\n return;\n case 'dragging': {\n const subscription = offset.addListener(({ value }) => {\n const next =\n index + (value > 0 ? Math.ceil(value) : Math.floor(value));\n\n if (next !== index) {\n listenersRef.current.forEach((listener) => listener(next));\n }\n\n offset.removeListener(subscription);\n });\n\n onSwipeStart?.();\n return;\n }\n }\n };\n\n const addEnterListener = React.useCallback((listener: Listener) => {\n listenersRef.current.push(listener);\n\n return () => {\n const index = listenersRef.current.indexOf(listener);\n\n if (index > -1) {\n listenersRef.current.splice(index, 1);\n }\n };\n }, []);\n\n return children({\n position: Animated.add(position, offset),\n addEnterListener,\n jumpTo,\n render: (children) => (\n <AnimatedViewPager\n {...rest}\n ref={pagerRef}\n style={[styles.container, style]}\n initialPage={index}\n keyboardDismissMode={\n keyboardDismissMode === 'auto' ? 'on-drag' : keyboardDismissMode\n }\n onPageScroll={Animated.event(\n [\n {\n nativeEvent: {\n position: position,\n offset: offset,\n },\n },\n ],\n { useNativeDriver: true }\n )}\n onPageSelected={(e) => {\n const index = e.nativeEvent.position;\n indexRef.current = index;\n onIndexChange(index);\n }}\n onPageScrollStateChanged={onPageScrollStateChanged}\n scrollEnabled={swipeEnabled}\n >\n {children}\n </AnimatedViewPager>\n ),\n });\n}\n\nconst styles = StyleSheet.create({\n container: {\n flex: 1,\n },\n});\n"]} |