@popperjs/core/lib/modifiers/computeStyles.js

Tooltip and Popover Positioning Engine

import { top, left, right, bottom } from "../enums.js";
import getOffsetParent from "../dom-utils/getOffsetParent.js";
import getWindow from "../dom-utils/getWindow.js";
import getDocumentElement from "../dom-utils/getDocumentElement.js";
import getComputedStyle from "../dom-utils/getComputedStyle.js";
import getBasePlacement from "../utils/getBasePlacement.js";
var unsetSides = {
  top: 'auto',
  right: 'auto',
  bottom: 'auto',
  left: 'auto'
}; // Round the offsets to the nearest suitable subpixel based on the DPR.
// Zooming can change the DPR, but it seems to report a value that will
// cleanly divide the values into the appropriate subpixels.

function roundOffsets(_ref) {
  var x = _ref.x,
      y = _ref.y;
  var win = window;
  var dpr = win.devicePixelRatio || 1;
  return {
    x: Math.round(x * dpr) / dpr || 0,
    y: Math.round(y * dpr) / dpr || 0
  };
}

export function mapToStyles(_ref2) {
  var _Object$assign2;

  var popper = _ref2.popper,
      popperRect = _ref2.popperRect,
      placement = _ref2.placement,
      offsets = _ref2.offsets,
      position = _ref2.position,
      gpuAcceleration = _ref2.gpuAcceleration,
      adaptive = _ref2.adaptive;

  var _roundOffsets = roundOffsets(offsets),
      x = _roundOffsets.x,
      y = _roundOffsets.y;

  var hasX = offsets.hasOwnProperty('x');
  var hasY = offsets.hasOwnProperty('y');
  var sideX = left;
  var sideY = top;
  var win = window;

  if (adaptive) {
    var offsetParent = getOffsetParent(popper);

    if (offsetParent === getWindow(popper)) {
      offsetParent = getDocumentElement(popper);
    } // $FlowFixMe: force type refinement, we compare offsetParent with window above, but Flow doesn't detect it

    /*:: offsetParent = (offsetParent: Element); */


    if (placement === top) {
      sideY = bottom;
      y -= offsetParent.clientHeight - popperRect.height;
      y *= gpuAcceleration ? 1 : -1;
    }

    if (placement === left) {
      sideX = right;
      x -= offsetParent.clientWidth - popperRect.width;
      x *= gpuAcceleration ? 1 : -1;
    }
  }

  var commonStyles = Object.assign({
    position: position
  }, adaptive && unsetSides);

  if (gpuAcceleration) {
    var _Object$assign;

    return Object.assign({}, commonStyles, (_Object$assign = {}, _Object$assign[sideY] = hasY ? '0' : '', _Object$assign[sideX] = hasX ? '0' : '', _Object$assign.transform = (win.devicePixelRatio || 1) < 2 ? "translate(" + x + "px, " + y + "px)" : "translate3d(" + x + "px, " + y + "px, 0)", _Object$assign));
  }

  return Object.assign({}, commonStyles, (_Object$assign2 = {}, _Object$assign2[sideY] = hasY ? y + "px" : '', _Object$assign2[sideX] = hasX ? x + "px" : '', _Object$assign2.transform = '', _Object$assign2));
}

function computeStyles(_ref3) {
  var state = _ref3.state,
      options = _ref3.options;
  var _options$gpuAccelerat = options.gpuAcceleration,
      gpuAcceleration = _options$gpuAccelerat === void 0 ? true : _options$gpuAccelerat,
      _options$adaptive = options.adaptive,
      adaptive = _options$adaptive === void 0 ? true : _options$adaptive;

  if (process.env.NODE_ENV !== "production") {
    var _getComputedStyle = getComputedStyle(state.elements.popper),
        transitionProperty = _getComputedStyle.transitionProperty;

    if (adaptive && ['transform', 'top', 'right', 'bottom', 'left'].some(function (property) {
      return transitionProperty.indexOf(property) >= 0;
    })) {
      console.warn(['Popper: Detected CSS transitions on at least one of the following', 'CSS properties: "transform", "top", "right", "bottom", "left".', '\n\n', 'Disable the "computeStyles" modifier\'s `adaptive` option to allow', 'for smooth transitions, or remove these properties from the CSS', 'transition declaration on the popper element if only transitioning', 'opacity or background-color for example.', '\n\n', 'We recommend using the popper element as a wrapper around an inner', 'element that can have any CSS property transitioned for animations.'].join(' '));
    }
  }

  var commonStyles = {
    placement: getBasePlacement(state.placement),
    popper: state.elements.popper,
    popperRect: state.rects.popper,
    gpuAcceleration: gpuAcceleration
  }; // popper offsets are always available

  state.styles.popper = Object.assign({}, state.styles.popper, {}, mapToStyles(Object.assign({}, commonStyles, {
    offsets: state.modifiersData.popperOffsets,
    position: state.options.strategy,
    adaptive: adaptive
  }))); // arrow offsets may not be available

  if (state.modifiersData.arrow != null) {
    state.styles.arrow = Object.assign({}, state.styles.arrow, {}, mapToStyles(Object.assign({}, commonStyles, {
      offsets: state.modifiersData.arrow,
      position: 'absolute',
      adaptive: false
    })));
  }

  state.attributes.popper = Object.assign({}, state.attributes.popper, {
    'data-popper-placement': state.placement
  });
}

export default {
  name: 'computeStyles',
  enabled: true,
  phase: 'beforeWrite',
  fn: computeStyles,
  data: {}
};