react-native-reanimated#withDelay TypeScript Examples

The following examples show how to use react-native-reanimated#withDelay. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: InstagramFeed.tsx    From react-native-gallery-toolkit with MIT License 4 votes vote down vote up 
function RenderItem({
  index: _index,
  activeItemIndex,
  item: { images, name },
  setControlsHidden,
  scrollViewRef,
}: RenderItemProps) {
  const opacity = useSharedValue(0);
  const backgroundScale = useSharedValue(0);
  const activeIndexInPager = useSharedValue(0);

  const normalizedImages = useMemo(
    () =>
      images.map((item) => {
        const { targetWidth, targetHeight } = normalizeDimensions(
          item,
        );

        return {
          ...item,
          width: targetWidth,
          height: targetHeight,
        };
      }),
    [images],
  );

  const onScale = useWorkletCallback((scale: number) => {
    opacity.value = interpolate(
      scale,
      [1, 2],
      [0, 0.7],
      Extrapolate.CLAMP,
    );

    backgroundScale.value = interpolate(
      scale,
      [1, 1.01, 2],
      [0, 4, 5],
      Extrapolate.CLAMP,
    );
  }, []);

  const onGestureStart = useWorkletCallback(() => {
    setControlsHidden(true);
    runOnJS(StatusBar.setHidden)(true);
    activeItemIndex.value = _index;
  }, []);

  const onGestureRelease = useWorkletCallback(() => {
    //delay for smooth hiding background opacity
    activeItemIndex.value = withDelay(200, withTiming(-1));
    setControlsHidden(false);
    runOnJS(StatusBar.setHidden)(false);
  }, []);

  const overlayStyles = useAnimatedStyle(() => {
    return {
      opacity: opacity.value,
      transform: [
        {
          scale: backgroundScale.value,
        },
      ],
    };
  });

  const keyExtractor = useCallback(
    ({ id }: { id: string }) => id,
    [],
  );

  const canvasHeight = useMemo(
    () => Math.max(...normalizedImages.map((item) => item.height)),
    [normalizedImages],
  );

  const renderPage = useCallback(({ item, pagerRefs }: RenderPageProps<SimpleGalleryItemType>) => {
    return (
      <ScalableImage
        outerGestureHandlerRefs={[...pagerRefs, scrollViewRef]}
        source={item.uri}
        width={item.width}
        height={item.height}
        onScale={onScale}
        onGestureStart={onGestureStart}
        onGestureRelease={onGestureRelease}
      />
    );
  }, []);

  const onIndexChangeWorklet = useWorkletCallback((nextIndex: number) => {
    activeIndexInPager.value = nextIndex;
  }, []);

  const content = (() => {
    if (images.length === 1) {
      return (
        <ScalableImage
          source={images[0].uri}
          width={images[0].width}
          height={images[0].height}
          onScale={onScale}
          outerGestureHandlerRefs={[scrollViewRef]}
          onGestureStart={onGestureStart}
          onGestureRelease={onGestureRelease}
        />
      );
    } else {
      return (
        <>
          <Pager
            pages={images}
            totalCount={images.length}
            keyExtractor={keyExtractor}
            initialIndex={0}
            width={width}
            gutterWidth={0}
            outerGestureHandlerRefs={[scrollViewRef]}
            verticallyEnabled={false}
            // @ts-expect-error
            renderPage={renderPage}
            onIndexChange={onIndexChangeWorklet}
          />

          <Pagination
            length={images.length}
            activeIndexInPager={activeIndexInPager}
          />
        </>
      );
    }
  })();

  return (
    <Animated.View style={s.itemContainer}>
      <Header uri={images[0].uri} name={name} />

      <Animated.View
        pointerEvents="none"
        style={[s.overlay, overlayStyles]}
      />

      <View style={[s.itemPager, { height: canvasHeight }]}>
        {content}
      </View>

      <Footer />
    </Animated.View>
  );
}