react-native-reanimated-carousel/lib/module/hooks/computeNewIndexWhenDataChanges.js

Simple carousel component.fully implemented using Reanimated 2.Infinitely scrolling, very smooth.

export function omitZero(a, b) {
  "worklet";

  if (a === 0) return 0;
  return b;
}
export function computeNewIndexWhenDataChanges(params) {
  "worklet";

  const {
    direction,
    handlerOffset: _handlerOffset,
    size,
    previousLength,
    currentLength
  } = params;
  let handlerOffset = _handlerOffset;
  let positionIndex;
  let round;
  const isPositive = direction < 0;

  if (isPositive) {
    positionIndex = Math.abs(handlerOffset) / size;
    round = parseInt(String(omitZero(previousLength, positionIndex / previousLength)));
  } else {
    positionIndex = (Math.abs(handlerOffset) - size) / size;
    round = parseInt(String(omitZero(previousLength, positionIndex / previousLength))) + 1;
  }

  const prevOffset = omitZero(previousLength, positionIndex % previousLength);
  const prevIndex = isPositive ? prevOffset : previousLength - prevOffset - 1;
  const changedLength = round * (currentLength - previousLength);
  const changedOffset = changedLength * size;

  if (prevIndex > currentLength - 1 && currentLength < previousLength) {
    if (isPositive) handlerOffset = (currentLength - 1) * size * direction;else handlerOffset = (currentLength - 1) * size * -1;
  } else {
    handlerOffset += changedOffset * direction;
  }

  return handlerOffset;
}
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