@kiwicom/orbit-components/es/Popover/helpers/calculateHorizontalPosition.js

Orbit-components is a React component library which provides developers with the easiest possible way of building Kiwi.com’s products.

import { ANCHORS } from "../consts";

const isInside = (p, canBe) => {
  if (p === ANCHORS.START && canBe[p]) {
    return ANCHORS.START;
  }

  if (p === ANCHORS.END && canBe[p]) {
    return ANCHORS.END;
  }

  return false;
};

const calculateHorizontalPosition = (desiredAnchor, positions) => {
  const canBe = {
    [ANCHORS.START]: positions.containerLeft + positions.popoverWidth < positions.windowWidth,
    [ANCHORS.END]: positions.containerLeft + positions.containerWidth >= positions.popoverWidth
  };
  const possibleAnchor = desiredAnchor.map(p => isInside(p, canBe)).filter(p => typeof p === "string");
  const posAnchor = possibleAnchor[0];

  if (typeof posAnchor === "string") {
    return posAnchor;
  }

  return null;
};

export default calculateHorizontalPosition;