sj-miniprogram/online-service/pc-web-preview/node_modules/@floating-ui/dom/dist/floating-ui.dom.browser.mjs

import { rectToClientRect, arrow as arrow$1, autoPlacement as autoPlacement$1, detectOverflow as detectOverflow$1, flip as flip$1, hide as hide$1, inline as inline$1, limitShift as limitShift$1, offset as offset$1, shift as shift$1, size as size$1, computePosition as computePosition$1 } from '@floating-ui/core';

/**
 * Custom positioning reference element.
 * @see https://floating-ui.com/docs/virtual-elements
 */

const min = Math.min;
const max = Math.max;
const round = Math.round;
const floor = Math.floor;
const createCoords = v => ({
  x: v,
  y: v
});

function hasWindow() {
  return typeof window !== 'undefined';
}
function getNodeName(node) {
  if (isNode(node)) {
    return (node.nodeName || '').toLowerCase();
  }
  // Mocked nodes in testing environments may not be instances of Node. By
  // returning `#document` an infinite loop won't occur.
  // https://github.com/floating-ui/floating-ui/issues/2317
  return '#document';
}
function getWindow(node) {
  var _node$ownerDocument;
  return (node == null || (_node$ownerDocument = node.ownerDocument) == null ? void 0 : _node$ownerDocument.defaultView) || window;
}
function getDocumentElement(node) {
  var _ref;
  return (_ref = (isNode(node) ? node.ownerDocument : node.document) || window.document) == null ? void 0 : _ref.documentElement;
}
function isNode(value) {
  if (!hasWindow()) {
    return false;
  }
  return value instanceof Node || value instanceof getWindow(value).Node;
}
function isElement(value) {
  if (!hasWindow()) {
    return false;
  }
  return value instanceof Element || value instanceof getWindow(value).Element;
}
function isHTMLElement(value) {
  if (!hasWindow()) {
    return false;
  }
  return value instanceof HTMLElement || value instanceof getWindow(value).HTMLElement;
}
function isShadowRoot(value) {
  if (!hasWindow() || typeof ShadowRoot === 'undefined') {
    return false;
  }
  return value instanceof ShadowRoot || value instanceof getWindow(value).ShadowRoot;
}
function isOverflowElement(element) {
  const {
    overflow,
    overflowX,
    overflowY,
    display
  } = getComputedStyle$1(element);
  return /auto|scroll|overlay|hidden|clip/.test(overflow + overflowY + overflowX) && display !== 'inline' && display !== 'contents';
}
function isTableElement(element) {
  return /^(table|td|th)$/.test(getNodeName(element));
}
function isTopLayer(element) {
  try {
    if (element.matches(':popover-open')) {
      return true;
    }
  } catch (_e) {
    // no-op
  }
  try {
    return element.matches(':modal');
  } catch (_e) {
    return false;
  }
}
const willChangeRe = /transform|translate|scale|rotate|perspective|filter/;
const containRe = /paint|layout|strict|content/;
const isNotNone = value => !!value && value !== 'none';
let isWebKitValue;
function isContainingBlock(elementOrCss) {
  const css = isElement(elementOrCss) ? getComputedStyle$1(elementOrCss) : elementOrCss;

  // https://developer.mozilla.org/en-US/docs/Web/CSS/Containing_block#identifying_the_containing_block
  // https://drafts.csswg.org/css-transforms-2/#individual-transforms
  return isNotNone(css.transform) || isNotNone(css.translate) || isNotNone(css.scale) || isNotNone(css.rotate) || isNotNone(css.perspective) || !isWebKit() && (isNotNone(css.backdropFilter) || isNotNone(css.filter)) || willChangeRe.test(css.willChange || '') || containRe.test(css.contain || '');
}
function getContainingBlock(element) {
  let currentNode = getParentNode(element);
  while (isHTMLElement(currentNode) && !isLastTraversableNode(currentNode)) {
    if (isContainingBlock(currentNode)) {
      return currentNode;
    } else if (isTopLayer(currentNode)) {
      return null;
    }
    currentNode = getParentNode(currentNode);
  }
  return null;
}
function isWebKit() {
  if (isWebKitValue == null) {
    isWebKitValue = typeof CSS !== 'undefined' && CSS.supports && CSS.supports('-webkit-backdrop-filter', 'none');
  }
  return isWebKitValue;
}
function isLastTraversableNode(node) {
  return /^(html|body|#document)$/.test(getNodeName(node));
}
function getComputedStyle$1(element) {
  return getWindow(element).getComputedStyle(element);
}
function getNodeScroll(element) {
  if (isElement(element)) {
    return {
      scrollLeft: element.scrollLeft,
      scrollTop: element.scrollTop
    };
  }
  return {
    scrollLeft: element.scrollX,
    scrollTop: element.scrollY
  };
}
function getParentNode(node) {
  if (getNodeName(node) === 'html') {
    return node;
  }
  const result =
  // Step into the shadow DOM of the parent of a slotted node.
  node.assignedSlot ||
  // DOM Element detected.
  node.parentNode ||
  // ShadowRoot detected.
  isShadowRoot(node) && node.host ||
  // Fallback.
  getDocumentElement(node);
  return isShadowRoot(result) ? result.host : result;
}
function getNearestOverflowAncestor(node) {
  const parentNode = getParentNode(node);
  if (isLastTraversableNode(parentNode)) {
    return node.ownerDocument ? node.ownerDocument.body : node.body;
  }
  if (isHTMLElement(parentNode) && isOverflowElement(parentNode)) {
    return parentNode;
  }
  return getNearestOverflowAncestor(parentNode);
}
function getOverflowAncestors(node, list, traverseIframes) {
  var _node$ownerDocument2;
  if (list === void 0) {
    list = [];
  }
  if (traverseIframes === void 0) {
    traverseIframes = true;
  }
  const scrollableAncestor = getNearestOverflowAncestor(node);
  const isBody = scrollableAncestor === ((_node$ownerDocument2 = node.ownerDocument) == null ? void 0 : _node$ownerDocument2.body);
  const win = getWindow(scrollableAncestor);
  if (isBody) {
    const frameElement = getFrameElement(win);
    return list.concat(win, win.visualViewport || [], isOverflowElement(scrollableAncestor) ? scrollableAncestor : [], frameElement && traverseIframes ? getOverflowAncestors(frameElement) : []);
  } else {
    return list.concat(scrollableAncestor, getOverflowAncestors(scrollableAncestor, [], traverseIframes));
  }
}
function getFrameElement(win) {
  return win.parent && Object.getPrototypeOf(win.parent) ? win.frameElement : null;
}

function getCssDimensions(element) {
  const css = getComputedStyle$1(element);
  // In testing environments, the `width` and `height` properties are empty
  // strings for SVG elements, returning NaN. Fallback to `0` in this case.
  let width = parseFloat(css.width) || 0;
  let height = parseFloat(css.height) || 0;
  const hasOffset = isHTMLElement(element);
  const offsetWidth = hasOffset ? element.offsetWidth : width;
  const offsetHeight = hasOffset ? element.offsetHeight : height;
  const shouldFallback = round(width) !== offsetWidth || round(height) !== offsetHeight;
  if (shouldFallback) {
    width = offsetWidth;
    height = offsetHeight;
  }
  return {
    width,
    height,
    $: shouldFallback
  };
}

function unwrapElement(element) {
  return !isElement(element) ? element.contextElement : element;
}

function getScale(element) {
  const domElement = unwrapElement(element);
  if (!isHTMLElement(domElement)) {
    return createCoords(1);
  }
  const rect = domElement.getBoundingClientRect();
  const {
    width,
    height,
    $
  } = getCssDimensions(domElement);
  let x = ($ ? round(rect.width) : rect.width) / width;
  let y = ($ ? round(rect.height) : rect.height) / height;

  // 0, NaN, or Infinity should always fallback to 1.

  if (!x || !Number.isFinite(x)) {
    x = 1;
  }
  if (!y || !Number.isFinite(y)) {
    y = 1;
  }
  return {
    x,
    y
  };
}

const noOffsets = /*#__PURE__*/createCoords(0);
function getVisualOffsets(element) {
  const win = getWindow(element);
  if (!isWebKit() || !win.visualViewport) {
    return noOffsets;
  }
  return {
    x: win.visualViewport.offsetLeft,
    y: win.visualViewport.offsetTop
  };
}
function shouldAddVisualOffsets(element, isFixed, floatingOffsetParent) {
  if (isFixed === void 0) {
    isFixed = false;
  }
  if (!floatingOffsetParent || isFixed && floatingOffsetParent !== getWindow(element)) {
    return false;
  }
  return isFixed;
}

function getBoundingClientRect(element, includeScale, isFixedStrategy, offsetParent) {
  if (includeScale === void 0) {
    includeScale = false;
  }
  if (isFixedStrategy === void 0) {
    isFixedStrategy = false;
  }
  const clientRect = element.getBoundingClientRect();
  const domElement = unwrapElement(element);
  let scale = createCoords(1);
  if (includeScale) {
    if (offsetParent) {
      if (isElement(offsetParent)) {
        scale = getScale(offsetParent);
      }
    } else {
      scale = getScale(element);
    }
  }
  const visualOffsets = shouldAddVisualOffsets(domElement, isFixedStrategy, offsetParent) ? getVisualOffsets(domElement) : createCoords(0);
  let x = (clientRect.left + visualOffsets.x) / scale.x;
  let y = (clientRect.top + visualOffsets.y) / scale.y;
  let width = clientRect.width / scale.x;
  let height = clientRect.height / scale.y;
  if (domElement) {
    const win = getWindow(domElement);
    const offsetWin = offsetParent && isElement(offsetParent) ? getWindow(offsetParent) : offsetParent;
    let currentWin = win;
    let currentIFrame = getFrameElement(currentWin);
    while (currentIFrame && offsetParent && offsetWin !== currentWin) {
      const iframeScale = getScale(currentIFrame);
      const iframeRect = currentIFrame.getBoundingClientRect();
      const css = getComputedStyle$1(currentIFrame);
      const left = iframeRect.left + (currentIFrame.clientLeft + parseFloat(css.paddingLeft)) * iframeScale.x;
      const top = iframeRect.top + (currentIFrame.clientTop + parseFloat(css.paddingTop)) * iframeScale.y;
      x *= iframeScale.x;
      y *= iframeScale.y;
      width *= iframeScale.x;
      height *= iframeScale.y;
      x += left;
      y += top;
      currentWin = getWindow(currentIFrame);
      currentIFrame = getFrameElement(currentWin);
    }
  }
  return rectToClientRect({
    width,
    height,
    x,
    y
  });
}

// If <html> has a CSS width greater than the viewport, then this will be
// incorrect for RTL.
function getWindowScrollBarX(element, rect) {
  const leftScroll = getNodeScroll(element).scrollLeft;
  if (!rect) {
    return getBoundingClientRect(getDocumentElement(element)).left + leftScroll;
  }
  return rect.left + leftScroll;
}

function getHTMLOffset(documentElement, scroll) {
  const htmlRect = documentElement.getBoundingClientRect();
  const x = htmlRect.left + scroll.scrollLeft - getWindowScrollBarX(documentElement, htmlRect);
  const y = htmlRect.top + scroll.scrollTop;
  return {
    x,
    y
  };
}

function convertOffsetParentRelativeRectToViewportRelativeRect(_ref) {
  let {
    elements,
    rect,
    offsetParent,
    strategy
  } = _ref;
  const isFixed = strategy === 'fixed';
  const documentElement = getDocumentElement(offsetParent);
  const topLayer = elements ? isTopLayer(elements.floating) : false;
  if (offsetParent === documentElement || topLayer && isFixed) {
    return rect;
  }
  let scroll = {
    scrollLeft: 0,
    scrollTop: 0
  };
  let scale = createCoords(1);
  const offsets = createCoords(0);
  const isOffsetParentAnElement = isHTMLElement(offsetParent);
  if (isOffsetParentAnElement || !isOffsetParentAnElement && !isFixed) {
    if (getNodeName(offsetParent) !== 'body' || isOverflowElement(documentElement)) {
      scroll = getNodeScroll(offsetParent);
    }
    if (isOffsetParentAnElement) {
      const offsetRect = getBoundingClientRect(offsetParent);
      scale = getScale(offsetParent);
      offsets.x = offsetRect.x + offsetParent.clientLeft;
      offsets.y = offsetRect.y + offsetParent.clientTop;
    }
  }
  const htmlOffset = documentElement && !isOffsetParentAnElement && !isFixed ? getHTMLOffset(documentElement, scroll) : createCoords(0);
  return {
    width: rect.width * scale.x,
    height: rect.height * scale.y,
    x: rect.x * scale.x - scroll.scrollLeft * scale.x + offsets.x + htmlOffset.x,
    y: rect.y * scale.y - scroll.scrollTop * scale.y + offsets.y + htmlOffset.y
  };
}

function getClientRects(element) {
  return Array.from(element.getClientRects());
}

// Gets the entire size of the scrollable document area, even extending outside
// of the `<html>` and `<body>` rect bounds if horizontally scrollable.
function getDocumentRect(element) {
  const html = getDocumentElement(element);
  const scroll = getNodeScroll(element);
  const body = element.ownerDocument.body;
  const width = max(html.scrollWidth, html.clientWidth, body.scrollWidth, body.clientWidth);
  const height = max(html.scrollHeight, html.clientHeight, body.scrollHeight, body.clientHeight);
  let x = -scroll.scrollLeft + getWindowScrollBarX(element);
  const y = -scroll.scrollTop;
  if (getComputedStyle$1(body).direction === 'rtl') {
    x += max(html.clientWidth, body.clientWidth) - width;
  }
  return {
    width,
    height,
    x,
    y
  };
}

// Safety check: ensure the scrollbar space is reasonable in case this
// calculation is affected by unusual styles.
// Most scrollbars leave 15-18px of space.
const SCROLLBAR_MAX = 25;
function getViewportRect(element, strategy) {
  const win = getWindow(element);
  const html = getDocumentElement(element);
  const visualViewport = win.visualViewport;
  let width = html.clientWidth;
  let height = html.clientHeight;
  let x = 0;
  let y = 0;
  if (visualViewport) {
    width = visualViewport.width;
    height = visualViewport.height;
    const visualViewportBased = isWebKit();
    if (!visualViewportBased || visualViewportBased && strategy === 'fixed') {
      x = visualViewport.offsetLeft;
      y = visualViewport.offsetTop;
    }
  }
  const windowScrollbarX = getWindowScrollBarX(html);
  // <html> `overflow: hidden` + `scrollbar-gutter: stable` reduces the
  // visual width of the <html> but this is not considered in the size
  // of `html.clientWidth`.
  if (windowScrollbarX <= 0) {
    const doc = html.ownerDocument;
    const body = doc.body;
    const bodyStyles = getComputedStyle(body);
    const bodyMarginInline = doc.compatMode === 'CSS1Compat' ? parseFloat(bodyStyles.marginLeft) + parseFloat(bodyStyles.marginRight) || 0 : 0;
    const clippingStableScrollbarWidth = Math.abs(html.clientWidth - body.clientWidth - bodyMarginInline);
    if (clippingStableScrollbarWidth <= SCROLLBAR_MAX) {
      width -= clippingStableScrollbarWidth;
    }
  } else if (windowScrollbarX <= SCROLLBAR_MAX) {
    // If the <body> scrollbar is on the left, the width needs to be extended
    // by the scrollbar amount so there isn't extra space on the right.
    width += windowScrollbarX;
  }
  return {
    width,
    height,
    x,
    y
  };
}

// Returns the inner client rect, subtracting scrollbars if present.
function getInnerBoundingClientRect(element, strategy) {
  const clientRect = getBoundingClientRect(element, true, strategy === 'fixed');
  const top = clientRect.top + element.clientTop;
  const left = clientRect.left + element.clientLeft;
  const scale = isHTMLElement(element) ? getScale(element) : createCoords(1);
  const width = element.clientWidth * scale.x;
  const height = element.clientHeight * scale.y;
  const x = left * scale.x;
  const y = top * scale.y;
  return {
    width,
    height,
    x,
    y
  };
}
function getClientRectFromClippingAncestor(element, clippingAncestor, strategy) {
  let rect;
  if (clippingAncestor === 'viewport') {
    rect = getViewportRect(element, strategy);
  } else if (clippingAncestor === 'document') {
    rect = getDocumentRect(getDocumentElement(element));
  } else if (isElement(clippingAncestor)) {
    rect = getInnerBoundingClientRect(clippingAncestor, strategy);
  } else {
    const visualOffsets = getVisualOffsets(element);
    rect = {
      x: clippingAncestor.x - visualOffsets.x,
      y: clippingAncestor.y - visualOffsets.y,
      width: clippingAncestor.width,
      height: clippingAncestor.height
    };
  }
  return rectToClientRect(rect);
}
function hasFixedPositionAncestor(element, stopNode) {
  const parentNode = getParentNode(element);
  if (parentNode === stopNode || !isElement(parentNode) || isLastTraversableNode(parentNode)) {
    return false;
  }
  return getComputedStyle$1(parentNode).position === 'fixed' || hasFixedPositionAncestor(parentNode, stopNode);
}

// A "clipping ancestor" is an `overflow` element with the characteristic of
// clipping (or hiding) child elements. This returns all clipping ancestors
// of the given element up the tree.
function getClippingElementAncestors(element, cache) {
  const cachedResult = cache.get(element);
  if (cachedResult) {
    return cachedResult;
  }
  let result = getOverflowAncestors(element, [], false).filter(el => isElement(el) && getNodeName(el) !== 'body');
  let currentContainingBlockComputedStyle = null;
  const elementIsFixed = getComputedStyle$1(element).position === 'fixed';
  let currentNode = elementIsFixed ? getParentNode(element) : element;

  // https://developer.mozilla.org/en-US/docs/Web/CSS/Containing_block#identifying_the_containing_block
  while (isElement(currentNode) && !isLastTraversableNode(currentNode)) {
    const computedStyle = getComputedStyle$1(currentNode);
    const currentNodeIsContaining = isContainingBlock(currentNode);
    if (!currentNodeIsContaining && computedStyle.position === 'fixed') {
      currentContainingBlockComputedStyle = null;
    }
    const shouldDropCurrentNode = elementIsFixed ? !currentNodeIsContaining && !currentContainingBlockComputedStyle : !currentNodeIsContaining && computedStyle.position === 'static' && !!currentContainingBlockComputedStyle && (currentContainingBlockComputedStyle.position === 'absolute' || currentContainingBlockComputedStyle.position === 'fixed') || isOverflowElement(currentNode) && !currentNodeIsContaining && hasFixedPositionAncestor(element, currentNode);
    if (shouldDropCurrentNode) {
      // Drop non-containing blocks.
      result = result.filter(ancestor => ancestor !== currentNode);
    } else {
      // Record last containing block for next iteration.
      currentContainingBlockComputedStyle = computedStyle;
    }
    currentNode = getParentNode(currentNode);
  }
  cache.set(element, result);
  return result;
}

// Gets the maximum area that the element is visible in due to any number of
// clipping ancestors.
function getClippingRect(_ref) {
  let {
    element,
    boundary,
    rootBoundary,
    strategy
  } = _ref;
  const elementClippingAncestors = boundary === 'clippingAncestors' ? isTopLayer(element) ? [] : getClippingElementAncestors(element, this._c) : [].concat(boundary);
  const clippingAncestors = [...elementClippingAncestors, rootBoundary];
  const firstRect = getClientRectFromClippingAncestor(element, clippingAncestors[0], strategy);
  let top = firstRect.top;
  let right = firstRect.right;
  let bottom = firstRect.bottom;
  let left = firstRect.left;
  for (let i = 1; i < clippingAncestors.length; i++) {
    const rect = getClientRectFromClippingAncestor(element, clippingAncestors[i], strategy);
    top = max(rect.top, top);
    right = min(rect.right, right);
    bottom = min(rect.bottom, bottom);
    left = max(rect.left, left);
  }
  return {
    width: right - left,
    height: bottom - top,
    x: left,
    y: top
  };
}

function getDimensions(element) {
  const {
    width,
    height
  } = getCssDimensions(element);
  return {
    width,
    height
  };
}

function getRectRelativeToOffsetParent(element, offsetParent, strategy) {
  const isOffsetParentAnElement = isHTMLElement(offsetParent);
  const documentElement = getDocumentElement(offsetParent);
  const isFixed = strategy === 'fixed';
  const rect = getBoundingClientRect(element, true, isFixed, offsetParent);
  let scroll = {
    scrollLeft: 0,
    scrollTop: 0
  };
  const offsets = createCoords(0);

  // If the <body> scrollbar appears on the left (e.g. RTL systems). Use
  // Firefox with layout.scrollbar.side = 3 in about:config to test this.
  function setLeftRTLScrollbarOffset() {
    offsets.x = getWindowScrollBarX(documentElement);
  }
  if (isOffsetParentAnElement || !isOffsetParentAnElement && !isFixed) {
    if (getNodeName(offsetParent) !== 'body' || isOverflowElement(documentElement)) {
      scroll = getNodeScroll(offsetParent);
    }
    if (isOffsetParentAnElement) {
      const offsetRect = getBoundingClientRect(offsetParent, true, isFixed, offsetParent);
      offsets.x = offsetRect.x + offsetParent.clientLeft;
      offsets.y = offsetRect.y + offsetParent.clientTop;
    } else if (documentElement) {
      setLeftRTLScrollbarOffset();
    }
  }
  if (isFixed && !isOffsetParentAnElement && documentElement) {
    setLeftRTLScrollbarOffset();
  }
  const htmlOffset = documentElement && !isOffsetParentAnElement && !isFixed ? getHTMLOffset(documentElement, scroll) : createCoords(0);
  const x = rect.left + scroll.scrollLeft - offsets.x - htmlOffset.x;
  const y = rect.top + scroll.scrollTop - offsets.y - htmlOffset.y;
  return {
    x,
    y,
    width: rect.width,
    height: rect.height
  };
}

function isStaticPositioned(element) {
  return getComputedStyle$1(element).position === 'static';
}

function getTrueOffsetParent(element, polyfill) {
  if (!isHTMLElement(element) || getComputedStyle$1(element).position === 'fixed') {
    return null;
  }
  if (polyfill) {
    return polyfill(element);
  }
  let rawOffsetParent = element.offsetParent;

  // Firefox returns the <html> element as the offsetParent if it's non-static,
  // while Chrome and Safari return the <body> element. The <body> element must
  // be used to perform the correct calculations even if the <html> element is
  // non-static.
  if (getDocumentElement(element) === rawOffsetParent) {
    rawOffsetParent = rawOffsetParent.ownerDocument.body;
  }
  return rawOffsetParent;
}

// Gets the closest ancestor positioned element. Handles some edge cases,
// such as table ancestors and cross browser bugs.
function getOffsetParent(element, polyfill) {
  const win = getWindow(element);
  if (isTopLayer(element)) {
    return win;
  }
  if (!isHTMLElement(element)) {
    let svgOffsetParent = getParentNode(element);
    while (svgOffsetParent && !isLastTraversableNode(svgOffsetParent)) {
      if (isElement(svgOffsetParent) && !isStaticPositioned(svgOffsetParent)) {
        return svgOffsetParent;
      }
      svgOffsetParent = getParentNode(svgOffsetParent);
    }
    return win;
  }
  let offsetParent = getTrueOffsetParent(element, polyfill);
  while (offsetParent && isTableElement(offsetParent) && isStaticPositioned(offsetParent)) {
    offsetParent = getTrueOffsetParent(offsetParent, polyfill);
  }
  if (offsetParent && isLastTraversableNode(offsetParent) && isStaticPositioned(offsetParent) && !isContainingBlock(offsetParent)) {
    return win;
  }
  return offsetParent || getContainingBlock(element) || win;
}

const getElementRects = async function (data) {
  const getOffsetParentFn = this.getOffsetParent || getOffsetParent;
  const getDimensionsFn = this.getDimensions;
  const floatingDimensions = await getDimensionsFn(data.floating);
  return {
    reference: getRectRelativeToOffsetParent(data.reference, await getOffsetParentFn(data.floating), data.strategy),
    floating: {
      x: 0,
      y: 0,
      width: floatingDimensions.width,
      height: floatingDimensions.height
    }
  };
};

function isRTL(element) {
  return getComputedStyle$1(element).direction === 'rtl';
}

const platform = {
  convertOffsetParentRelativeRectToViewportRelativeRect,
  getDocumentElement,
  getClippingRect,
  getOffsetParent,
  getElementRects,
  getClientRects,
  getDimensions,
  getScale,
  isElement,
  isRTL
};

function rectsAreEqual(a, b) {
  return a.x === b.x && a.y === b.y && a.width === b.width && a.height === b.height;
}

// https://samthor.au/2021/observing-dom/
function observeMove(element, onMove) {
  let io = null;
  let timeoutId;
  const root = getDocumentElement(element);
  function cleanup() {
    var _io;
    clearTimeout(timeoutId);
    (_io = io) == null || _io.disconnect();
    io = null;
  }
  function refresh(skip, threshold) {
    if (skip === void 0) {
      skip = false;
    }
    if (threshold === void 0) {
      threshold = 1;
    }
    cleanup();
    const elementRectForRootMargin = element.getBoundingClientRect();
    const {
      left,
      top,
      width,
      height
    } = elementRectForRootMargin;
    if (!skip) {
      onMove();
    }
    if (!width || !height) {
      return;
    }
    const insetTop = floor(top);
    const insetRight = floor(root.clientWidth - (left + width));
    const insetBottom = floor(root.clientHeight - (top + height));
    const insetLeft = floor(left);
    const rootMargin = -insetTop + "px " + -insetRight + "px " + -insetBottom + "px " + -insetLeft + "px";
    const options = {
      rootMargin,
      threshold: max(0, min(1, threshold)) || 1
    };
    let isFirstUpdate = true;
    function handleObserve(entries) {
      const ratio = entries[0].intersectionRatio;
      if (ratio !== threshold) {
        if (!isFirstUpdate) {
          return refresh();
        }
        if (!ratio) {
          // If the reference is clipped, the ratio is 0. Throttle the refresh
          // to prevent an infinite loop of updates.
          timeoutId = setTimeout(() => {
            refresh(false, 1e-7);
          }, 1000);
        } else {
          refresh(false, ratio);
        }
      }
      if (ratio === 1 && !rectsAreEqual(elementRectForRootMargin, element.getBoundingClientRect())) {
        // It's possible that even though the ratio is reported as 1, the
        // element is not actually fully within the IntersectionObserver's root
        // area anymore. This can happen under performance constraints. This may
        // be a bug in the browser's IntersectionObserver implementation. To
        // work around this, we compare the element's bounding rect now with
        // what it was at the time we created the IntersectionObserver. If they
        // are not equal then the element moved, so we refresh.
        refresh();
      }
      isFirstUpdate = false;
    }

    // Older browsers don't support a `document` as the root and will throw an
    // error.
    try {
      io = new IntersectionObserver(handleObserve, {
        ...options,
        // Handle <iframe>s
        root: root.ownerDocument
      });
    } catch (_e) {
      io = new IntersectionObserver(handleObserve, options);
    }
    io.observe(element);
  }
  refresh(true);
  return cleanup;
}

/**
 * Automatically updates the position of the floating element when necessary.
 * Should only be called when the floating element is mounted on the DOM or
 * visible on the screen.
 * @returns cleanup function that should be invoked when the floating element is
 * removed from the DOM or hidden from the screen.
 * @see https://floating-ui.com/docs/autoUpdate
 */
function autoUpdate(reference, floating, update, options) {
  if (options === void 0) {
    options = {};
  }
  const {
    ancestorScroll = true,
    ancestorResize = true,
    elementResize = typeof ResizeObserver === 'function',
    layoutShift = typeof IntersectionObserver === 'function',
    animationFrame = false
  } = options;
  const referenceEl = unwrapElement(reference);
  const ancestors = ancestorScroll || ancestorResize ? [...(referenceEl ? getOverflowAncestors(referenceEl) : []), ...(floating ? getOverflowAncestors(floating) : [])] : [];
  ancestors.forEach(ancestor => {
    ancestorScroll && ancestor.addEventListener('scroll', update, {
      passive: true
    });
    ancestorResize && ancestor.addEventListener('resize', update);
  });
  const cleanupIo = referenceEl && layoutShift ? observeMove(referenceEl, update) : null;
  let reobserveFrame = -1;
  let resizeObserver = null;
  if (elementResize) {
    resizeObserver = new ResizeObserver(_ref => {
      let [firstEntry] = _ref;
      if (firstEntry && firstEntry.target === referenceEl && resizeObserver && floating) {
        // Prevent update loops when using the `size` middleware.
        // https://github.com/floating-ui/floating-ui/issues/1740
        resizeObserver.unobserve(floating);
        cancelAnimationFrame(reobserveFrame);
        reobserveFrame = requestAnimationFrame(() => {
          var _resizeObserver;
          (_resizeObserver = resizeObserver) == null || _resizeObserver.observe(floating);
        });
      }
      update();
    });
    if (referenceEl && !animationFrame) {
      resizeObserver.observe(referenceEl);
    }
    if (floating) {
      resizeObserver.observe(floating);
    }
  }
  let frameId;
  let prevRefRect = animationFrame ? getBoundingClientRect(reference) : null;
  if (animationFrame) {
    frameLoop();
  }
  function frameLoop() {
    const nextRefRect = getBoundingClientRect(reference);
    if (prevRefRect && !rectsAreEqual(prevRefRect, nextRefRect)) {
      update();
    }
    prevRefRect = nextRefRect;
    frameId = requestAnimationFrame(frameLoop);
  }
  update();
  return () => {
    var _resizeObserver2;
    ancestors.forEach(ancestor => {
      ancestorScroll && ancestor.removeEventListener('scroll', update);
      ancestorResize && ancestor.removeEventListener('resize', update);
    });
    cleanupIo == null || cleanupIo();
    (_resizeObserver2 = resizeObserver) == null || _resizeObserver2.disconnect();
    resizeObserver = null;
    if (animationFrame) {
      cancelAnimationFrame(frameId);
    }
  };
}

/**
 * Resolves with an object of overflow side offsets that determine how much the
 * element is overflowing a given clipping boundary on each side.
 * - positive = overflowing the boundary by that number of pixels
 * - negative = how many pixels left before it will overflow
 * - 0 = lies flush with the boundary
 * @see https://floating-ui.com/docs/detectOverflow
 */
const detectOverflow = detectOverflow$1;

/**
 * Modifies the placement by translating the floating element along the
 * specified axes.
 * A number (shorthand for `mainAxis` or distance), or an axes configuration
 * object may be passed.
 * @see https://floating-ui.com/docs/offset
 */
const offset = offset$1;

/**
 * Optimizes the visibility of the floating element by choosing the placement
 * that has the most space available automatically, without needing to specify a
 * preferred placement. Alternative to `flip`.
 * @see https://floating-ui.com/docs/autoPlacement
 */
const autoPlacement = autoPlacement$1;

/**
 * Optimizes the visibility of the floating element by shifting it in order to
 * keep it in view when it will overflow the clipping boundary.
 * @see https://floating-ui.com/docs/shift
 */
const shift = shift$1;

/**
 * Optimizes the visibility of the floating element by flipping the `placement`
 * in order to keep it in view when the preferred placement(s) will overflow the
 * clipping boundary. Alternative to `autoPlacement`.
 * @see https://floating-ui.com/docs/flip
 */
const flip = flip$1;

/**
 * Provides data that allows you to change the size of the floating element —
 * for instance, prevent it from overflowing the clipping boundary or match the
 * width of the reference element.
 * @see https://floating-ui.com/docs/size
 */
const size = size$1;

/**
 * Provides data to hide the floating element in applicable situations, such as
 * when it is not in the same clipping context as the reference element.
 * @see https://floating-ui.com/docs/hide
 */
const hide = hide$1;

/**
 * Provides data to position an inner element of the floating element so that it
 * appears centered to the reference element.
 * @see https://floating-ui.com/docs/arrow
 */
const arrow = arrow$1;

/**
 * Provides improved positioning for inline reference elements that can span
 * over multiple lines, such as hyperlinks or range selections.
 * @see https://floating-ui.com/docs/inline
 */
const inline = inline$1;

/**
 * Built-in `limiter` that will stop `shift()` at a certain point.
 */
const limitShift = limitShift$1;

/**
 * Computes the `x` and `y` coordinates that will place the floating element
 * next to a given reference element.
 */
const computePosition = (reference, floating, options) => {
  // This caches the expensive `getClippingElementAncestors` function so that
  // multiple lifecycle resets re-use the same result. It only lives for a
  // single call. If other functions become expensive, we can add them as well.
  const cache = new Map();
  const mergedOptions = {
    platform,
    ...options
  };
  const platformWithCache = {
    ...mergedOptions.platform,
    _c: cache
  };
  return computePosition$1(reference, floating, {
    ...mergedOptions,
    platform: platformWithCache
  });
};

export { arrow, autoPlacement, autoUpdate, computePosition, detectOverflow, flip, getOverflowAncestors, hide, inline, limitShift, offset, platform, shift, size };