react-native-ui-lib/src/incubator/WheelPicker/helpers/useListMiddleIndex.js

<p align="center"> <img src="https://user-images.githubusercontent.com/1780255/105469025-56759000-5ca0-11eb-993d-3568c1fd54f4.png" height="250px" style="display:block"/> </p> <p align="center">UI Toolset & Components Library for React Native</p> <p a

export default (({
  itemHeight,
  listSize
}) => {
  const valueInRange = (value, min, max) => {
    if (value < min || value === -0) {
      return min;
    }

    if (value > max) {
      return max;
    }

    return value;
  };

  const middleIndex = offset => {
    const calculatedIndex = Math.round(offset / itemHeight);
    return valueInRange(calculatedIndex, 0, listSize - 1);
  };

  return middleIndex;
});