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feat(slideshow): added & Enable auto-slide to next after a time threshold #214

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feat(slideshow): added & Enable auto-slide to next after a time threshold #214

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20 changes: 15 additions & 5 deletions src/ImageViewing.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,8 @@ type Props = {
delayLongPress?: number;
HeaderComponent?: ComponentType<{ imageIndex: number }>;
FooterComponent?: ComponentType<{ imageIndex: number }>;
enableSlideShow?: boolean;
slideShowThreshold?: number;
};

const DEFAULT_ANIMATION_TYPE = "fade";
Expand All @@ -56,7 +58,7 @@ function ImageViewing({
imageIndex,
visible,
onRequestClose,
onLongPress = () => {},
onLongPress = () => { },
onImageIndexChange,
animationType = DEFAULT_ANIMATION_TYPE,
backgroundColor = DEFAULT_BG_COLOR,
Expand All @@ -66,18 +68,26 @@ function ImageViewing({
delayLongPress = DEFAULT_DELAY_LONG_PRESS,
HeaderComponent,
FooterComponent,
enableSlideShow = false,
slideShowThreshold = 3000
}: Props) {
const imageList = useRef<VirtualizedList<ImageSource>>(null);
const [opacity, onRequestCloseEnhanced] = useRequestClose(onRequestClose);
const [currentImageIndex, onScroll] = useImageIndexChange(imageIndex, SCREEN);
const [currentImageIndex, onScroll, scrollToNextImage] = useImageIndexChange(imageIndex, SCREEN, images);
const [headerTransform, footerTransform, toggleBarsVisible] =
useAnimatedComponents();

useEffect(() => {
if (onImageIndexChange) {
onImageIndexChange(currentImageIndex);
}
}, [currentImageIndex]);
if (enableSlideShow) {
const interval = setInterval(() => {
scrollToNextImage(imageList.current);
}, slideShowThreshold);
return () => clearInterval(interval);
}
}, [currentImageIndex, enableSlideShow]);

const onZoom = useCallback(
(isScaled: boolean) => {
Expand Down Expand Up @@ -148,8 +158,8 @@ function ImageViewing({
keyExtractor
? keyExtractor(imageSrc, index)
: typeof imageSrc === "number"
? `${imageSrc}`
: imageSrc.uri
? `${imageSrc}`
: imageSrc.uri
}
/>
{typeof FooterComponent !== "undefined" && (
Expand Down
12 changes: 10 additions & 2 deletions src/hooks/useImageIndexChange.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ import { NativeSyntheticEvent, NativeScrollEvent } from "react-native";

import { Dimensions } from "../@types";

const useImageIndexChange = (imageIndex: number, screen: Dimensions) => {
const useImageIndexChange = (imageIndex: number, screen: Dimensions,imagesArray: any) => {
const [currentImageIndex, setImageIndex] = useState(imageIndex);
const onScroll = (event: NativeSyntheticEvent<NativeScrollEvent>) => {
const {
Expand All @@ -26,7 +26,15 @@ const useImageIndexChange = (imageIndex: number, screen: Dimensions) => {
}
};

return [currentImageIndex, onScroll] as const;
const scrollToNextImage = (imageListRef: any) => {
if (imageListRef) {
const nextIndex = currentImageIndex + 1 < imagesArray.length ? currentImageIndex + 1 : 0;
imageListRef.scrollToOffset({ offset: nextIndex * screen.width, animated: true });
setImageIndex(nextIndex);
}
};

return [currentImageIndex, onScroll,scrollToNextImage] as const;
};

export default useImageIndexChange;