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Edit File: computeStyle.js

import getSupportedPropertyName from '../utils/getSupportedPropertyName';
import find from '../utils/find';
import getOffsetParent from '../utils/getOffsetParent';
import getBoundingClientRect from '../utils/getBoundingClientRect';
import getRoundedOffsets from '../utils/getRoundedOffsets';
import isBrowser from '../utils/isBrowser';

const isFirefox = isBrowser && /Firefox/i.test(navigator.userAgent);

/**
 * @function
 * @memberof Modifiers
 * @argument {Object} data - The data object generated by `update` method
 * @argument {Object} options - Modifiers configuration and options
 * @returns {Object} The data object, properly modified
 */
export default function computeStyle(data, options) {
  const { x, y } = options;
  const { popper } = data.offsets;

// Remove this legacy support in Popper.js v2
  const legacyGpuAccelerationOption = find(
    data.instance.modifiers,
    modifier => modifier.name === 'applyStyle'
  ).gpuAcceleration;
  if (legacyGpuAccelerationOption !== undefined) {
    console.warn(
      'WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!'
    );
  }
  const gpuAcceleration =
    legacyGpuAccelerationOption !== undefined
      ? legacyGpuAccelerationOption
      : options.gpuAcceleration;

const offsetParent = getOffsetParent(data.instance.popper);
  const offsetParentRect = getBoundingClientRect(offsetParent);

// Styles
  const styles = {
    position: popper.position,
  };

const offsets = getRoundedOffsets(
    data,
    window.devicePixelRatio < 2 || !isFirefox
  );

const sideA = x === 'bottom' ? 'top' : 'bottom';
  const sideB = y === 'right' ? 'left' : 'right';

// if gpuAcceleration is set to `true` and transform is supported,
  //  we use `translate3d` to apply the position to the popper we
  // automatically use the supported prefixed version if needed
  const prefixedProperty = getSupportedPropertyName('transform');

// now, let's make a step back and look at this code closely (wtf?)
  // If the content of the popper grows once it's been positioned, it
  // may happen that the popper gets misplaced because of the new content
  // overflowing its reference element
  // To avoid this problem, we provide two options (x and y), which allow
  // the consumer to define the offset origin.
  // If we position a popper on top of a reference element, we can set
  // `x` to `top` to make the popper grow towards its top instead of
  // its bottom.
  let left, top;
  if (sideA === 'bottom') {
    // when offsetParent is <html> the positioning is relative to the bottom of the screen (excluding the scrollbar)
    // and not the bottom of the html element
    if (offsetParent.nodeName === 'HTML') {
      top = -offsetParent.clientHeight + offsets.bottom;
    } else {
      top = -offsetParentRect.height + offsets.bottom;
    }
  } else {
    top = offsets.top;
  }
  if (sideB === 'right') {
    if (offsetParent.nodeName === 'HTML') {
      left = -offsetParent.clientWidth + offsets.right;
    } else {
      left = -offsetParentRect.width + offsets.right;
    }
  } else {
    left = offsets.left;
  }
  if (gpuAcceleration && prefixedProperty) {
    styles[prefixedProperty] = `translate3d(${left}px, ${top}px, 0)`;
    styles[sideA] = 0;
    styles[sideB] = 0;
    styles.willChange = 'transform';
  } else {
    // othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
    const invertTop = sideA === 'bottom' ? -1 : 1;
    const invertLeft = sideB === 'right' ? -1 : 1;
    styles[sideA] = top * invertTop;
    styles[sideB] = left * invertLeft;
    styles.willChange = `${sideA}, ${sideB}`;
  }

// Attributes
  const attributes = {
    'x-placement': data.placement,
  };

// Update `data` attributes, styles and arrowStyles
  data.attributes = { ...attributes, ...data.attributes };
  data.styles = { ...styles, ...data.styles };
  data.arrowStyles = { ...data.offsets.arrow, ...data.arrowStyles };

return data;
}

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