meliorence / meliorence/react-native-snap-carousel
handle currentIndex inside renderItem
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- JavaScript
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Description
Question
I need to access to currentIndex inside renderItem to know if the current displayed item isFocus.
For the moment, I handle the index change with onSnapToItem with :
const [carouselIndex, setIndex] = React.useState(initialIndex);
const refCarousel = React.useRef(null);
const handleIndexChange = (index: number) => {
setIndex(index);
};
<Carousel
data={productList}
ref={refCarousel}
style={fillContainer}
sliderWidth={width}
itemWidth={width}
firstItem={initialIndex}
onBeforeSnapToItem={handleIndexChange}
keyboardShouldPersistTaps="always"
renderItem={({ item, index }) => {
return (
<InventoryProductSheet
key={item.id}
productId={item.id}
index={index}
isFocused={index === carouselIndex}
/>
);
}}
/>
But there is some bug with hooks and react-native-snap-carousel (https://github.com/archriss/react-native-snap-carousel/issues/559)
i have tried refCarousel.current.currentIndex but its doesn't trigger rerender :/
There is a better way to handle currentIndex inside renderItem ?
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by tracing the Carousel renderItem callback, onBeforeSnapToItem, and the refCarousel.current.currentIndex behavior described in the issue. Determine whether the component can expose a rerender-safe current index to renderItem, and define done as reliably identifying the focused item without the reported hooks issue.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, react-native
- Domain
- mobile
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100