diff options
Diffstat (limited to 'src/view/com/lightbox/ImageViewing/components/ImageItem/ImageItem.ios.tsx')
| -rw-r--r-- | src/view/com/lightbox/ImageViewing/components/ImageItem/ImageItem.ios.tsx | 265 |
1 files changed, 104 insertions, 161 deletions
diff --git a/src/view/com/lightbox/ImageViewing/components/ImageItem/ImageItem.ios.tsx b/src/view/com/lightbox/ImageViewing/components/ImageItem/ImageItem.ios.tsx index 598b18ed2..f73f355ac 100644 --- a/src/view/com/lightbox/ImageViewing/components/ImageItem/ImageItem.ios.tsx +++ b/src/view/com/lightbox/ImageViewing/components/ImageItem/ImageItem.ios.tsx @@ -6,162 +6,162 @@ * */ -import React, {MutableRefObject, useCallback, useRef, useState} from 'react' +import React, {useState} from 'react' -import { - Animated, - Dimensions, - ScrollView, - StyleSheet, - View, - NativeScrollEvent, - NativeSyntheticEvent, - NativeTouchEvent, - TouchableWithoutFeedback, -} from 'react-native' +import {Dimensions, StyleSheet} from 'react-native' import {Image} from 'expo-image' -import {GestureType} from 'react-native-gesture-handler' +import Animated, { + interpolate, + runOnJS, + useAnimatedRef, + useAnimatedScrollHandler, + useAnimatedStyle, + useSharedValue, +} from 'react-native-reanimated' +import {Gesture, GestureDetector} from 'react-native-gesture-handler' import useImageDimensions from '../../hooks/useImageDimensions' import {ImageSource, Dimensions as ImageDimensions} from '../../@types' import {ImageLoading} from './ImageLoading' -const DOUBLE_TAP_DELAY = 300 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 -const MIN_ZOOM = 2 -const MAX_SCALE = 2 +const MAX_ORIGINAL_IMAGE_ZOOM = 2 +const MIN_DOUBLE_TAP_SCALE = 2 type Props = { imageSrc: ImageSource onRequestClose: () => void + onTap: () => void onZoom: (scaled: boolean) => void - pinchGestureRef: MutableRefObject<GestureType> isScrollViewBeingDragged: boolean } const AnimatedImage = Animated.createAnimatedComponent(Image) -let lastTapTS: number | null = null - -const ImageItem = ({imageSrc, onZoom, onRequestClose}: Props) => { - const scrollViewRef = useRef<ScrollView>(null) +const ImageItem = ({imageSrc, onTap, onZoom, onRequestClose}: Props) => { + const scrollViewRef = useAnimatedRef<Animated.ScrollView>() + const translationY = useSharedValue(0) const [loaded, setLoaded] = useState(false) const [scaled, setScaled] = useState(false) const imageDimensions = useImageDimensions(imageSrc) - const [translate, scale] = getImageTransform(imageDimensions, SCREEN) - const [scrollValueY] = useState(() => new Animated.Value(0)) - const maxScrollViewZoom = MAX_SCALE / (scale || 1) + const maxZoomScale = imageDimensions + ? (imageDimensions.width / SCREEN.width) * MAX_ORIGINAL_IMAGE_ZOOM + : 1 - const imageOpacity = scrollValueY.interpolate({ - inputRange: [-SWIPE_CLOSE_OFFSET, 0, SWIPE_CLOSE_OFFSET], - outputRange: [0.5, 1, 0.5], + const animatedStyle = useAnimatedStyle(() => { + return { + opacity: interpolate( + translationY.value, + [-SWIPE_CLOSE_OFFSET, 0, SWIPE_CLOSE_OFFSET], + [0.5, 1, 0.5], + ), + } }) - const imagesStyles = getImageStyles(imageDimensions, translate, scale || 1) - 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 && Math.abs(velocityY) > SWIPE_CLOSE_VELOCITY) { - onRequestClose() + const scrollHandler = useAnimatedScrollHandler({ + onScroll(e) { + const nextIsScaled = e.zoomScale > 1 + translationY.value = nextIsScaled ? 0 : e.contentOffset.y + if (scaled !== nextIsScaled) { + runOnJS(handleZoom)(nextIsScaled) } }, - [onRequestClose, onZoom], - ) + onEndDrag(e) { + const velocityY = e.velocity?.y ?? 0 + const nextIsScaled = e.zoomScale > 1 + if (scaled !== nextIsScaled) { + runOnJS(handleZoom)(nextIsScaled) + } + if (!nextIsScaled && Math.abs(velocityY) > SWIPE_CLOSE_VELOCITY) { + runOnJS(onRequestClose)() + } + }, + }) + + function handleZoom(nextIsScaled: boolean) { + onZoom(nextIsScaled) + setScaled(nextIsScaled) + } - const onScroll = ({nativeEvent}: NativeSyntheticEvent<NativeScrollEvent>) => { - const offsetY = nativeEvent?.contentOffset?.y ?? 0 + function handleDoubleTap(absoluteX: number, absoluteY: number) { + const scrollResponderRef = scrollViewRef?.current?.getScrollResponder() + let nextZoomRect = { + x: 0, + y: 0, + width: SCREEN.width, + height: SCREEN.height, + } - if (nativeEvent?.zoomScale > 1) { - return + const willZoom = !scaled + if (willZoom) { + nextZoomRect = getZoomRectAfterDoubleTap( + imageDimensions, + absoluteX, + absoluteY, + ) } - scrollValueY.setValue(offsetY) + // @ts-ignore + scrollResponderRef?.scrollResponderZoomTo({ + ...nextZoomRect, // This rect is in screen coordinates + animated: true, + }) } - const handleDoubleTap = useCallback( - (event: NativeSyntheticEvent<NativeTouchEvent>) => { - const nowTS = new Date().getTime() - const scrollResponderRef = scrollViewRef?.current?.getScrollResponder() - - if (lastTapTS && nowTS - lastTapTS < DOUBLE_TAP_DELAY) { - let nextZoomRect = { - x: 0, - y: 0, - width: SCREEN.width, - height: SCREEN.height, - } + const singleTap = Gesture.Tap().onEnd(() => { + runOnJS(onTap)() + }) - const willZoom = !scaled - if (willZoom) { - const {pageX, pageY} = event.nativeEvent - nextZoomRect = getZoomRectAfterDoubleTap( - imageDimensions, - pageX, - pageY, - ) - } + const doubleTap = Gesture.Tap() + .numberOfTaps(2) + .onEnd(e => { + const {absoluteX, absoluteY} = e + runOnJS(handleDoubleTap)(absoluteX, absoluteY) + }) - // @ts-ignore - scrollResponderRef?.scrollResponderZoomTo({ - ...nextZoomRect, // This rect is in screen coordinates - animated: true, - }) - } else { - lastTapTS = nowTS - } - }, - [imageDimensions, scaled], - ) + const composedGesture = Gesture.Exclusive(doubleTap, singleTap) return ( - <View> - <ScrollView + <GestureDetector gesture={composedGesture}> + <Animated.ScrollView + // @ts-ignore Something's up with the types here ref={scrollViewRef} style={styles.listItem} pinchGestureEnabled showsHorizontalScrollIndicator={false} showsVerticalScrollIndicator={false} - maximumZoomScale={maxScrollViewZoom} + maximumZoomScale={maxZoomScale} contentContainerStyle={styles.imageScrollContainer} - scrollEnabled={true} - onScroll={onScroll} - onScrollEndDrag={onScrollEndDrag} - scrollEventThrottle={1}> + onScroll={scrollHandler}> {(!loaded || !imageDimensions) && <ImageLoading />} - <TouchableWithoutFeedback - onPress={handleDoubleTap} - accessibilityRole="image" + <AnimatedImage + contentFit="contain" + // NOTE: Don't pass imageSrc={imageSrc} or MobX will break. + source={{uri: imageSrc.uri}} + style={[styles.image, animatedStyle]} accessibilityLabel={imageSrc.alt} - accessibilityHint=""> - <AnimatedImage - source={imageSrc} - style={imageStylesWithOpacity} - onLoad={() => setLoaded(true)} - /> - </TouchableWithoutFeedback> - </ScrollView> - </View> + accessibilityHint="" + onLoad={() => setLoaded(true)} + /> + </Animated.ScrollView> + </GestureDetector> ) } const styles = StyleSheet.create({ + imageScrollContainer: { + height: SCREEN.height, + }, listItem: { - width: SCREEN_WIDTH, - height: SCREEN_HEIGHT, + width: SCREEN.width, + height: SCREEN.height, }, - imageScrollContainer: { - height: SCREEN_HEIGHT, + image: { + width: SCREEN.width, + height: SCREEN.height, }, }) @@ -191,7 +191,7 @@ const getZoomRectAfterDoubleTap = ( const zoom = Math.max( imageAspect / screenAspect, screenAspect / imageAspect, - MIN_ZOOM, + MIN_DOUBLE_TAP_SCALE, ) // Unlike in the Android version, we don't constrain the *max* zoom level here. // Instead, this is done in the ScrollView props so that it constraints pinch too. @@ -253,61 +253,4 @@ const getZoomRectAfterDoubleTap = ( } } -const getImageStyles = ( - image: ImageDimensions | null, - translate: {readonly x: number; readonly y: number} | undefined, - scale?: number, -) => { - if (!image?.width || !image?.height) { - return {width: 0, height: 0} - } - const transform = [] - if (translate) { - transform.push({translateX: translate.x}) - transform.push({translateY: translate.y}) - } - if (scale) { - // @ts-ignore TODO - is scale incorrect? might need to remove -prf - transform.push({scale}, {perspective: new Animated.Value(1000)}) - } - return { - width: image.width, - height: image.height, - transform, - } -} - -const getImageTransform = ( - image: ImageDimensions | null, - screen: ImageDimensions, -) => { - if (!image?.width || !image?.height) { - return [] as const - } - - const wScale = screen.width / image.width - const hScale = screen.height / image.height - const scale = Math.min(wScale, hScale) - const {x, y} = getImageTranslate(image, screen) - - return [{x, y}, scale] as const -} - -const getImageTranslate = ( - image: ImageDimensions, - screen: ImageDimensions, -): {x: number; y: number} => { - const getTranslateForAxis = (axis: 'x' | 'y'): number => { - const imageSize = axis === 'x' ? image.width : image.height - const screenSize = axis === 'x' ? screen.width : screen.height - - return (screenSize - imageSize) / 2 - } - - return { - x: getTranslateForAxis('x'), - y: getTranslateForAxis('y'), - } -} - export default React.memo(ImageItem) |