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Replace the <Tabs> component with the more effective <PagerWithHeader…
…> component
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| import * as React from 'react' | ||
| import { | ||
| LayoutChangeEvent, | ||
| NativeScrollEvent, | ||
| NativeSyntheticEvent, | ||
| StyleSheet, | ||
| } from 'react-native' | ||
| import Animated, { | ||
| useAnimatedStyle, | ||
| useSharedValue, | ||
| withTiming, | ||
| } from 'react-native-reanimated' | ||
| import {Pager, PagerRef, RenderTabBarFnProps} from 'view/com/pager/Pager' | ||
| import {TabBar} from './TabBar' | ||
| import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries' | ||
| import {OnScrollCb} from 'lib/hooks/useOnMainScroll' | ||
|
|
||
| interface PagerWithHeaderChildParams { | ||
| headerHeight: number | ||
| onScroll: OnScrollCb | ||
| } | ||
|
|
||
| export interface PagerWithHeaderProps { | ||
| testID?: string | ||
| children: (((props: PagerWithHeaderChildParams) => JSX.Element) | null)[] | ||
| items: string[] | ||
| renderHeader?: () => JSX.Element | ||
| initialPage?: number | ||
| onPageSelected?: (index: number) => void | ||
| onCurrentPageSelected?: () => void | ||
| } | ||
| export const PagerWithHeader = React.forwardRef<PagerRef, PagerWithHeaderProps>( | ||
| function PageWithHeaderImpl( | ||
| { | ||
| children, | ||
| testID, | ||
| items, | ||
| renderHeader, | ||
| initialPage, | ||
| onPageSelected, | ||
| onCurrentPageSelected, | ||
| }: PagerWithHeaderProps, | ||
| ref, | ||
| ) { | ||
| const {isMobile} = useWebMediaQueries() | ||
| const scrollYs = React.useRef<Record<number, number>>({}) | ||
| const [currentPage, setCurrentPage] = React.useState(0) | ||
| const scrollY = useSharedValue(scrollYs.current[currentPage] || 0) | ||
| const [tabBarHeight, setTabBarHeight] = React.useState(0) | ||
| const [headerHeight, setHeaderHeight] = React.useState(0) | ||
| const headerTransform = useAnimatedStyle( | ||
| () => ({ | ||
| transform: [ | ||
| { | ||
| translateY: clampedInvert( | ||
| scrollY.value, | ||
| headerHeight, | ||
| tabBarHeight, | ||
| ), | ||
| }, | ||
| ], | ||
| }), | ||
| [scrollY, headerHeight, tabBarHeight], | ||
| ) | ||
|
|
||
| const onTabBarLayout = React.useCallback( | ||
| (evt: LayoutChangeEvent) => { | ||
| setTabBarHeight(evt.nativeEvent.layout.height) | ||
| }, | ||
| [setTabBarHeight], | ||
| ) | ||
|
|
||
| const onHeaderLayout = React.useCallback( | ||
| (evt: LayoutChangeEvent) => { | ||
| setHeaderHeight(evt.nativeEvent.layout.height) | ||
| }, | ||
| [setHeaderHeight], | ||
| ) | ||
|
|
||
| const renderTabBar = React.useCallback( | ||
| (props: RenderTabBarFnProps) => { | ||
| return ( | ||
| <Animated.View | ||
| onLayout={onHeaderLayout} | ||
| style={[ | ||
| isMobile ? styles.tabBarMobile : styles.tabBarDesktop, | ||
| headerTransform, | ||
| ]}> | ||
| {renderHeader?.()} | ||
| <TabBar | ||
| items={items} | ||
| selectedPage={props.selectedPage} | ||
| onSelect={props.onSelect} | ||
| onPressSelected={onCurrentPageSelected} | ||
| onLayout={onTabBarLayout} | ||
| /> | ||
| </Animated.View> | ||
| ) | ||
| }, | ||
| [ | ||
| items, | ||
| renderHeader, | ||
| headerTransform, | ||
| onCurrentPageSelected, | ||
| isMobile, | ||
| onTabBarLayout, | ||
| onHeaderLayout, | ||
| ], | ||
| ) | ||
|
|
||
| const childProps = React.useMemo<PagerWithHeaderChildParams>(() => { | ||
| return { | ||
| headerHeight, | ||
| onScroll(event: NativeSyntheticEvent<NativeScrollEvent>) { | ||
| scrollY.value = event.nativeEvent.contentOffset.y | ||
| scrollYs.current[currentPage] = event.nativeEvent.contentOffset.y | ||
| }, | ||
| } | ||
| }, [headerHeight, scrollY, scrollYs, currentPage]) | ||
|
|
||
| const onPageSelectedInner = React.useCallback( | ||
| (index: number) => { | ||
| setCurrentPage(index) | ||
| scrollY.value = withTiming(scrollYs.current[index] || 0, { | ||
| duration: 300, | ||
| }) | ||
| onPageSelected?.(index) | ||
| }, | ||
| [scrollY, onPageSelected, setCurrentPage, scrollYs], | ||
| ) | ||
|
|
||
| return ( | ||
| <Pager | ||
| ref={ref} | ||
| testID={testID} | ||
| initialPage={initialPage} | ||
| onPageSelected={onPageSelectedInner} | ||
| renderTabBar={renderTabBar} | ||
| tabBarPosition="top"> | ||
| {children.filter(Boolean).map(child => { | ||
| // TODO- how can keys get passed here? | ||
| if (child) { | ||
| return child(childProps) | ||
| } | ||
| return null | ||
| })} | ||
| </Pager> | ||
| ) | ||
| }, | ||
| ) | ||
|
|
||
| const styles = StyleSheet.create({ | ||
| tabBarMobile: { | ||
| position: 'absolute', | ||
| zIndex: 1, | ||
| top: 0, | ||
| left: 0, | ||
| width: '100%', | ||
| }, | ||
| tabBarDesktop: { | ||
| position: 'absolute', | ||
| zIndex: 1, | ||
| top: 0, | ||
| // @ts-ignore Web only -prf | ||
| left: 'calc(50% - 299px)', | ||
| width: 598, | ||
| }, | ||
| }) | ||
|
|
||
| function clampedInvert( | ||
| value: number, | ||
| headerHeight: number, | ||
| tabBarHeight: number, | ||
| ) { | ||
| 'worklet' | ||
| return Math.min(Math.max(value, 0), headerHeight - tabBarHeight) * -1 | ||
| } |
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