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import React, {
useRef,
createRef,
useMemo,
useEffect,
useState,
useCallback,
} from 'react'
import {StyleSheet, View, ScrollView} from 'react-native'
import {Text} from '../util/text/Text'
import {PressableWithHover} from '../util/PressableWithHover'
import {usePalette} from 'lib/hooks/usePalette'
import {isDesktopWeb} from 'platform/detection'
export interface TabBarProps {
testID?: string
selectedPage: number
items: string[]
indicatorColor?: string
onSelect?: (index: number) => void
onPressSelected?: () => void
}
export function TabBar({
testID,
selectedPage,
items,
indicatorColor,
onSelect,
onPressSelected,
}: TabBarProps) {
const pal = usePalette('default')
const scrollElRef = useRef<ScrollView>(null)
const [itemXs, setItemXs] = useState<number[]>([])
const itemRefs = useMemo(
() => Array.from({length: items.length}).map(() => createRef<View>()),
[items.length],
)
const indicatorStyle = useMemo(
() => ({borderBottomColor: indicatorColor || pal.colors.link}),
[indicatorColor, pal],
)
useEffect(() => {
scrollElRef.current?.scrollTo({x: itemXs[selectedPage] || 0})
}, [scrollElRef, itemXs, selectedPage])
const onPressItem = useCallback(
(index: number) => {
onSelect?.(index)
if (index === selectedPage) {
onPressSelected?.()
}
},
[onSelect, onPressSelected, selectedPage],
)
const onLayout = React.useCallback(() => {
const promises = []
for (let i = 0; i < items.length; i++) {
promises.push(
new Promise<number>(resolve => {
if (!itemRefs[i].current) {
return resolve(0)
}
itemRefs[i].current?.measure((x: number) => resolve(x))
}),
)
}
Promise.all(promises).then((Xs: number[]) => {
setItemXs(Xs)
})
}, [itemRefs, setItemXs, items.length])
return (
<View testID={testID} style={[pal.view, styles.outer]}>
<ScrollView
horizontal={true}
showsHorizontalScrollIndicator={false}
ref={scrollElRef}
onLayout={onLayout}>
{items.map((item, i) => {
const selected = i === selectedPage
return (
<PressableWithHover
ref={itemRefs[i]}
key={item}
style={[styles.item, selected && indicatorStyle]}
hoverStyle={pal.viewLight}
onPress={() => onPressItem(i)}>
<Text
type="xl-bold"
testID={testID ? `${testID}-${item}` : undefined}
style={selected ? pal.text : pal.textLight}>
{item}
</Text>
</PressableWithHover>
)
})}
</ScrollView>
</View>
)
}
const styles = isDesktopWeb
? StyleSheet.create({
outer: {
flexDirection: 'row',
width: 598,
paddingHorizontal: 14,
},
item: {
paddingTop: 14,
paddingBottom: 12,
paddingHorizontal: 12,
borderBottomWidth: 3,
borderBottomColor: 'transparent',
},
})
: StyleSheet.create({
outer: {
flex: 1,
flexDirection: 'row',
paddingLeft: 14,
},
item: {
paddingTop: 8,
paddingBottom: 12,
marginRight: 24,
borderBottomWidth: 3,
borderBottomColor: 'transparent',
},
})
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