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/**
* Copyright (c) JOB TODAY S.A. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
*/
import React, {useCallback, useRef, useState} from 'react'
import {
Animated,
Dimensions,
ScrollView,
StyleSheet,
View,
NativeScrollEvent,
NativeSyntheticEvent,
TouchableWithoutFeedback,
} from 'react-native'
import useDoubleTapToZoom from '../../hooks/useDoubleTapToZoom'
import useImageDimensions from '../../hooks/useImageDimensions'
import {getImageStyles, getImageTransform} from '../../utils'
import {ImageSource} from '../../@types'
import {ImageLoading} from './ImageLoading'
const SWIPE_CLOSE_OFFSET = 75
const SWIPE_CLOSE_VELOCITY = 1
const SCREEN = Dimensions.get('screen')
const SCREEN_WIDTH = SCREEN.width
const SCREEN_HEIGHT = SCREEN.height
type Props = {
imageSrc: ImageSource
onRequestClose: () => void
onZoom: (scaled: boolean) => void
onLongPress: (image: ImageSource) => void
delayLongPress: number
swipeToCloseEnabled?: boolean
doubleTapToZoomEnabled?: boolean
}
const ImageItem = ({
imageSrc,
onZoom,
onRequestClose,
onLongPress,
delayLongPress,
swipeToCloseEnabled = true,
doubleTapToZoomEnabled = true,
}: Props) => {
const scrollViewRef = useRef<ScrollView>(null)
const [loaded, setLoaded] = useState(false)
const [scaled, setScaled] = useState(false)
const imageDimensions = useImageDimensions(imageSrc)
const handleDoubleTap = useDoubleTapToZoom(scrollViewRef, scaled, SCREEN)
const [translate, scale] = getImageTransform(imageDimensions, SCREEN)
const scrollValueY = new Animated.Value(0)
const scaleValue = new Animated.Value(scale || 1)
const translateValue = new Animated.ValueXY(translate)
const maxScale = scale && scale > 0 ? Math.max(1 / scale, 1) : 1
const imageOpacity = scrollValueY.interpolate({
inputRange: [-SWIPE_CLOSE_OFFSET, 0, SWIPE_CLOSE_OFFSET],
outputRange: [0.5, 1, 0.5],
})
const imagesStyles = getImageStyles(
imageDimensions,
translateValue,
scaleValue,
)
const imageStylesWithOpacity = {...imagesStyles, opacity: imageOpacity}
const onScrollEndDrag = useCallback(
({nativeEvent}: NativeSyntheticEvent<NativeScrollEvent>) => {
const velocityY = nativeEvent?.velocity?.y ?? 0
const currentScaled = nativeEvent?.zoomScale > 1
onZoom(currentScaled)
setScaled(currentScaled)
if (
!currentScaled &&
swipeToCloseEnabled &&
Math.abs(velocityY) > SWIPE_CLOSE_VELOCITY
) {
onRequestClose()
}
},
[onRequestClose, onZoom, swipeToCloseEnabled],
)
const onScroll = ({nativeEvent}: NativeSyntheticEvent<NativeScrollEvent>) => {
const offsetY = nativeEvent?.contentOffset?.y ?? 0
if (nativeEvent?.zoomScale > 1) {
return
}
scrollValueY.setValue(offsetY)
}
const onLongPressHandler = useCallback(() => {
onLongPress(imageSrc)
}, [imageSrc, onLongPress])
return (
<View>
<ScrollView
ref={scrollViewRef}
style={styles.listItem}
pinchGestureEnabled
showsHorizontalScrollIndicator={false}
showsVerticalScrollIndicator={false}
maximumZoomScale={maxScale}
contentContainerStyle={styles.imageScrollContainer}
scrollEnabled={swipeToCloseEnabled}
onScrollEndDrag={onScrollEndDrag}
scrollEventThrottle={1}
{...(swipeToCloseEnabled && {
onScroll,
})}>
{(!loaded || !imageDimensions) && <ImageLoading />}
<TouchableWithoutFeedback
onPress={doubleTapToZoomEnabled ? handleDoubleTap : undefined}
onLongPress={onLongPressHandler}
delayLongPress={delayLongPress}
accessibilityRole="image">
<Animated.Image
source={imageSrc}
style={imageStylesWithOpacity}
onLoad={() => setLoaded(true)}
/>
</TouchableWithoutFeedback>
</ScrollView>
</View>
)
}
const styles = StyleSheet.create({
listItem: {
width: SCREEN_WIDTH,
height: SCREEN_HEIGHT,
},
imageScrollContainer: {
height: SCREEN_HEIGHT,
},
})
export default React.memo(ImageItem)
|
