Sortable.js

/**!
 * Sortable 1.11.0
 * @author	RubaXa   <trash@rubaxa.org>
 * @author	owenm    <owen23355@gmail.com>
 * @license MIT
 */
(function (global, factory) {
  typeof exports === "object" && typeof module !== "undefined"
    ? (module.exports = factory())
    : typeof define === "function" && define.amd
    ? define(factory)
    : ((global =
        typeof globalThis !== "undefined" ? globalThis : global || self),
      (global.Sortable = factory()));
})(this, function () {
  "use strict";
  const __warn =
    "" +
    "Importing Sortable directly from GitHub is deprecated.\n" +
    "This file will not receive any more updates.\n" +
    "Please follow the usage instructions to continue getting support: https://github.com/SortableJS/Sortable";

  console.warn(__warn);

  var version = "1.11.0";

  function userAgent(pattern) {
    if (typeof window !== "undefined" && window.navigator) {
      return !!(/*@__PURE__*/ navigator.userAgent.match(pattern));
    }
  }

  const IE11OrLess = userAgent(
    /(?:Trident.*rv[ :]?11\.|msie|iemobile|Windows Phone)/i
  );
  const Edge = userAgent(/Edge/i);
  const FireFox = userAgent(/firefox/i);
  const Safari =
    userAgent(/safari/i) && !userAgent(/chrome/i) && !userAgent(/android/i);
  const IOS = userAgent(/iP(ad|od|hone)/i);
  const ChromeForAndroid = userAgent(/chrome/i) && userAgent(/android/i);

  const captureMode = {
    capture: false,
    passive: false,
  };

  function on(el, event, fn) {
    el.addEventListener(event, fn, !IE11OrLess && captureMode);
  }

  function off(el, event, fn) {
    el.removeEventListener(event, fn, !IE11OrLess && captureMode);
  }

  function matches(/**HTMLElement*/ el, /**String*/ selector) {
    if (!selector) return;

    selector[0] === ">" && (selector = selector.substring(1));

    if (el) {
      try {
        if (el.matches) {
          return el.matches(selector);
        } else if (el.msMatchesSelector) {
          return el.msMatchesSelector(selector);
        } else if (el.webkitMatchesSelector) {
          return el.webkitMatchesSelector(selector);
        }
      } catch (_) {
        return false;
      }
    }

    return false;
  }

  function getParentOrHost(el) {
    return el.host && el !== document && el.host.nodeType
      ? el.host
      : el.parentNode;
  }

  function closest(
    /**HTMLElement*/ el,
    /**String*/ selector,
    /**HTMLElement*/ ctx,
    includeCTX
  ) {
    if (el) {
      ctx = ctx || document;

      do {
        if (
          (selector != null &&
            (selector[0] === ">"
              ? el.parentNode === ctx && matches(el, selector)
              : matches(el, selector))) ||
          (includeCTX && el === ctx)
        ) {
          return el;
        }

        if (el === ctx) break;
        /* jshint boss:true */
      } while ((el = getParentOrHost(el)));
    }

    return null;
  }

  const R_SPACE = /\s+/g;

  function toggleClass(el, name, state) {
    if (el && name) {
      if (el.classList) {
        el.classList[state ? "add" : "remove"](name);
      } else {
        let className = (" " + el.className + " ")
          .replace(R_SPACE, " ")
          .replace(" " + name + " ", " ");
        el.className = (className + (state ? " " + name : "")).replace(
          R_SPACE,
          " "
        );
      }
    }
  }

  function css(el, prop, val) {
    let style = el && el.style;

    if (style) {
      if (val === void 0) {
        if (document.defaultView && document.defaultView.getComputedStyle) {
          val = document.defaultView.getComputedStyle(el, "");
        } else if (el.currentStyle) {
          val = el.currentStyle;
        }

        return prop === void 0 ? val : val[prop];
      } else {
        if (!(prop in style) && prop.indexOf("webkit") === -1) {
          prop = "-webkit-" + prop;
        }

        style[prop] = val + (typeof val === "string" ? "" : "px");
      }
    }
  }

  function matrix(el, selfOnly) {
    let appliedTransforms = "";
    if (typeof el === "string") {
      appliedTransforms = el;
    } else {
      do {
        //@ts-ignore
        let transform = css(el, "transform");

        if (transform && transform !== "none") {
          appliedTransforms = transform + " " + appliedTransforms;
        }
        /* jshint boss:true */
      } while (!selfOnly && (el = el.parentNode));
    }

    //@ts-ignore
    const matrixFn =
      window.DOMMatrix ||
      window.WebKitCSSMatrix ||
      window.CSSMatrix ||
      window.MSCSSMatrix;
    /*jshint -W056 */
    return matrixFn && new matrixFn(appliedTransforms);
  }

  function find(ctx, tagName, iterator) {
    if (ctx) {
      let list = ctx.getElementsByTagName(tagName),
        i = 0,
        n = list.length;

      if (iterator) {
        for (; i < n; i++) {
          iterator(list[i], i);
        }
      }

      return list;
    }

    return [];
  }

  function getWindowScrollingElement() {
    let scrollingElement = document.scrollingElement;

    if (scrollingElement) {
      return scrollingElement;
    } else {
      return document.documentElement;
    }
  }

  /**
   * Returns the "bounding client rect" of given element
   * @param  {HTMLElement} el                       The element whose boundingClientRect is wanted
   * @param  {[Boolean]} relativeToContainingBlock  Whether the rect should be relative to the containing block of (including) the container
   * @param  {[Boolean]} relativeToNonStaticParent  Whether the rect should be relative to the relative parent of (including) the contaienr
   * @param  {[Boolean]} undoScale                  Whether the container's scale() should be undone
   * @param  {[HTMLElement]} container              The parent the element will be placed in
   * @return {Object}                               The boundingClientRect of el, with specified adjustments
   */
  function getRect(
    el,
    relativeToContainingBlock,
    relativeToNonStaticParent,
    undoScale,
    container
  ) {
    if (!el.getBoundingClientRect && el !== window) return;

    let elRect, top, left, bottom, right, height, width;

    if (el !== window && el !== getWindowScrollingElement()) {
      elRect = el.getBoundingClientRect();
      top = elRect.top;
      left = elRect.left;
      bottom = elRect.bottom;
      right = elRect.right;
      height = elRect.height;
      width = elRect.width;
    } else {
      top = 0;
      left = 0;
      bottom = window.innerHeight;
      right = window.innerWidth;
      height = window.innerHeight;
      width = window.innerWidth;
    }

    if (
      (relativeToContainingBlock || relativeToNonStaticParent) &&
      el !== window
    ) {
      // Adjust for translate()
      container = container || el.parentNode;

      // solves #1123 (see: https://stackoverflow.com/a/37953806/6088312)
      // Not needed on <= IE11
      if (!IE11OrLess) {
        do {
          if (
            container &&
            container.getBoundingClientRect &&
            //@ts-ignore
            (css(container, "transform") !== "none" ||
              (relativeToNonStaticParent &&
                //@ts-ignore
                css(container, "position") !== "static"))
          ) {
            let containerRect = container.getBoundingClientRect();

            // Set relative to edges of padding box of container
            //@ts-ignore
            top -=
              containerRect.top + parseInt(css(container, "border-top-width"));
            //@ts-ignore
            left -=
              containerRect.left +
              parseInt(css(container, "border-left-width"));
            bottom = top + elRect.height;
            right = left + elRect.width;

            break;
          }
          /* jshint boss:true */
        } while ((container = container.parentNode));
      }
    }

    if (undoScale && el !== window) {
      // Adjust for scale()
      //@ts-ignore
      let elMatrix = matrix(container || el),
        scaleX = elMatrix && elMatrix.a,
        scaleY = elMatrix && elMatrix.d;

      if (elMatrix) {
        top /= scaleY;
        left /= scaleX;

        width /= scaleX;
        height /= scaleY;

        bottom = top + height;
        right = left + width;
      }
    }

    return {
      top: top,
      left: left,
      bottom: bottom,
      right: right,
      width: width,
      height: height,
    };
  }

  /**
   * Checks if a side of an element is scrolled past a side of its parents
   * @param  {HTMLElement}  el           The element who's side being scrolled out of view is in question
   * @param  {String}       elSide       Side of the element in question ('top', 'left', 'right', 'bottom')
   * @param  {String}       parentSide   Side of the parent in question ('top', 'left', 'right', 'bottom')
   * @return {HTMLElement}               The parent scroll element that the el's side is scrolled past, or null if there is no such element
   */
  function isScrolledPast(el, elSide, parentSide) {
    let parent = getParentAutoScrollElement(el, true),
      //@ts-ignore
      elSideVal = getRect(el)[elSide];

    /* jshint boss:true */
    while (parent) {
      //@ts-ignore
      let parentSideVal = getRect(parent)[parentSide],
        visible;

      if (parentSide === "top" || parentSide === "left") {
        visible = elSideVal >= parentSideVal;
      } else {
        visible = elSideVal <= parentSideVal;
      }

      if (!visible) return parent;

      if (parent === getWindowScrollingElement()) break;

      parent = getParentAutoScrollElement(parent, false);
    }

    return false;
  }

  /**
   * Gets nth child of el, ignoring hidden children, sortable's elements (does not ignore clone if it's visible)
   * and non-draggable elements
   * @param  {HTMLElement} el       The parent element
   * @param  {Number} childNum      The index of the child
   * @param  {Object} options       Parent Sortable's options
   * @return {HTMLElement}          The child at index childNum, or null if not found
   */
  function getChild(el, childNum, options) {
    let currentChild = 0,
      i = 0,
      children = el.children;

    while (i < children.length) {
      if (
        children[i].style.display !== "none" &&
        //@ts-ignore
        children[i] !== Sortable.ghost &&
        //@ts-ignore
        children[i] !== Sortable.dragged &&
        closest(children[i], options.draggable, el, false)
      ) {
        if (currentChild === childNum) {
          return children[i];
        }
        currentChild++;
      }

      i++;
    }
    return null;
  }

  /**
   * Gets the last child in the el, ignoring ghostEl or invisible elements (clones)
   * @param  {HTMLElement} el       Parent element
   * @param  {selector} selector    Any other elements that should be ignored
   * @return {HTMLElement}          The last child, ignoring ghostEl
   */
  function lastChild(el, selector) {
    let last = el.lastElementChild;

    while (
      last &&
      //@ts-ignore
      (last === Sortable.ghost ||
        //@ts-ignore
        css(last, "display") === "none" ||
        (selector && !matches(last, selector)))
    ) {
      last = last.previousElementSibling;
    }

    return last || null;
  }

  /**
   * Returns the index of an element within its parent for a selected set of
   * elements
   * @param  {HTMLElement} el
   * @param  {selector} selector
   * @return {number}
   */
  function index(el, selector) {
    let index = 0;

    if (!el || !el.parentNode) {
      return -1;
    }

    /* jshint boss:true */
    while ((el = el.previousElementSibling)) {
      //@ts-ignore
      if (
        el.nodeName.toUpperCase() !== "TEMPLATE" &&
        el !== Sortable.clone &&
        (!selector || matches(el, selector))
      ) {
        index++;
      }
    }

    return index;
  }

  /**
   * Returns the scroll offset of the given element, added with all the scroll offsets of parent elements.
   * The value is returned in real pixels.
   * @param  {HTMLElement} el
   * @return {Array}             Offsets in the format of [left, top]
   */
  function getRelativeScrollOffset(el) {
    let offsetLeft = 0,
      offsetTop = 0,
      winScroller = getWindowScrollingElement();

    if (el) {
      do {
        //@ts-ignore
        let elMatrix = matrix(el),
          scaleX = elMatrix.a,
          scaleY = elMatrix.d;

        offsetLeft += el.scrollLeft * scaleX;
        offsetTop += el.scrollTop * scaleY;
      } while (el !== winScroller && (el = el.parentNode));
    }

    return [offsetLeft, offsetTop];
  }

  /**
   * Returns the index of the object within the given array
   * @param  {Array} arr   Array that may or may not hold the object
   * @param  {Object} obj  An object that has a key-value pair unique to and identical to a key-value pair in the object you want to find
   * @return {Number}      The index of the object in the array, or -1
   */
  function indexOfObject(arr, obj) {
    for (let i in arr) {
      if (!arr.hasOwnProperty(i)) continue;
      for (let key in obj) {
        if (obj.hasOwnProperty(key) && obj[key] === arr[i][key])
          return Number(i);
      }
    }
    return -1;
  }

  function getParentAutoScrollElement(el, includeSelf) {
    // skip to window
    if (!el || !el.getBoundingClientRect) return getWindowScrollingElement();

    let elem = el;
    let gotSelf = false;
    do {
      // we don't need to get elem css if it isn't even overflowing in the first place (performance)
      if (
        elem.clientWidth < elem.scrollWidth ||
        elem.clientHeight < elem.scrollHeight
      ) {
        //@ts-ignore
        let elemCSS = css(elem);
        if (
          (elem.clientWidth < elem.scrollWidth &&
            (elemCSS.overflowX == "auto" || elemCSS.overflowX == "scroll")) ||
          (elem.clientHeight < elem.scrollHeight &&
            (elemCSS.overflowY == "auto" || elemCSS.overflowY == "scroll"))
        ) {
          if (!elem.getBoundingClientRect || elem === document.body)
            return getWindowScrollingElement();

          if (gotSelf || includeSelf) return elem;
          gotSelf = true;
        }
      }
      /* jshint boss:true */
    } while ((elem = elem.parentNode));

    return getWindowScrollingElement();
  }

  function extend(dst, src) {
    if (dst && src) {
      for (let key in src) {
        if (src.hasOwnProperty(key)) {
          dst[key] = src[key];
        }
      }
    }

    return dst;
  }

  function isRectEqual(rect1, rect2) {
    return (
      Math.round(rect1.top) === Math.round(rect2.top) &&
      Math.round(rect1.left) === Math.round(rect2.left) &&
      Math.round(rect1.height) === Math.round(rect2.height) &&
      Math.round(rect1.width) === Math.round(rect2.width)
    );
  }

  let _throttleTimeout;
  function throttle(callback, ms) {
    return function () {
      if (!_throttleTimeout) {
        let args = arguments,
          _this = this;

        if (args.length === 1) {
          callback.call(_this, args[0]);
        } else {
          callback.apply(_this, args);
        }

        _throttleTimeout = setTimeout(function () {
          _throttleTimeout = void 0;
        }, ms);
      }
    };
  }

  function cancelThrottle() {
    clearTimeout(_throttleTimeout);
    _throttleTimeout = void 0;
  }

  function scrollBy(el, x, y) {
    el.scrollLeft += x;
    el.scrollTop += y;
  }

  function clone(el) {
    //@ts-ignore
    let Polymer = window.Polymer;
    //@ts-ignore
    let $ = window.jQuery || window.Zepto;

    if (Polymer && Polymer.dom) {
      return Polymer.dom(el).cloneNode(true);
    } else if ($) {
      return $(el).clone(true)[0];
    } else {
      return el.cloneNode(true);
    }
  }

  function setRect(el, rect) {
    css(el, "position", "absolute");
    css(el, "top", rect.top);
    css(el, "left", rect.left);
    css(el, "width", rect.width);
    css(el, "height", rect.height);
  }

  function unsetRect(el) {
    css(el, "position", "");
    css(el, "top", "");
    css(el, "left", "");
    css(el, "width", "");
    css(el, "height", "");
  }

  const expando = "Sortable" + new Date().getTime();

  function AnimationStateManager() {
    let animationStates = [],
      animationCallbackId;

    return {
      captureAnimationState() {
        animationStates = [];
        if (!this.options.animation) return;
        let children = [].slice.call(this.el.children);

        children.forEach((child) => {
          if (css(child, "display") === "none" || child === Sortable.ghost)
            return;
          animationStates.push({
            target: child,
            rect: getRect(child),
          });
          let fromRect = {
            ...animationStates[animationStates.length - 1].rect,
          };

          // If animating: compensate for current animation
          if (child.thisAnimationDuration) {
            let childMatrix = matrix(child, true);
            if (childMatrix) {
              fromRect.top -= childMatrix.f;
              fromRect.left -= childMatrix.e;
            }
          }

          child.fromRect = fromRect;
        });
      },

      addAnimationState(state) {
        animationStates.push(state);
      },

      removeAnimationState(target) {
        animationStates.splice(indexOfObject(animationStates, { target }), 1);
      },

      animateAll(callback) {
        if (!this.options.animation) {
          clearTimeout(animationCallbackId);
          if (typeof callback === "function") callback();
          return;
        }

        let animating = false,
          animationTime = 0;

        animationStates.forEach((state) => {
          let time = 0,
            target = state.target,
            fromRect = target.fromRect,
            toRect = getRect(target),
            prevFromRect = target.prevFromRect,
            prevToRect = target.prevToRect,
            animatingRect = state.rect,
            targetMatrix = matrix(target, true);

          if (targetMatrix) {
            // Compensate for current animation
            toRect.top -= targetMatrix.f;
            toRect.left -= targetMatrix.e;
          }

          target.toRect = toRect;

          if (target.thisAnimationDuration) {
            // Could also check if animatingRect is between fromRect and toRect
            if (
              isRectEqual(prevFromRect, toRect) &&
              !isRectEqual(fromRect, toRect) &&
              // Make sure animatingRect is on line between toRect & fromRect
              (animatingRect.top - toRect.top) /
                (animatingRect.left - toRect.left) ===
                (fromRect.top - toRect.top) / (fromRect.left - toRect.left)
            ) {
              // If returning to same place as started from animation and on same axis
              time = calculateRealTime(
                animatingRect,
                prevFromRect,
                prevToRect,
                this.options
              );
            }
          }

          // if fromRect != toRect: animate
          if (!isRectEqual(toRect, fromRect)) {
            target.prevFromRect = fromRect;
            target.prevToRect = toRect;

            if (!time) {
              time = this.options.animation;
            }
            this.animate(target, animatingRect, toRect, time);
          }

          if (time) {
            animating = true;
            animationTime = Math.max(animationTime, time);
            clearTimeout(target.animationResetTimer);
            target.animationResetTimer = setTimeout(function () {
              target.animationTime = 0;
              target.prevFromRect = null;
              target.fromRect = null;
              target.prevToRect = null;
              target.thisAnimationDuration = null;
            }, time);
            target.thisAnimationDuration = time;
          }
        });

        clearTimeout(animationCallbackId);
        if (!animating) {
          if (typeof callback === "function") callback();
        } else {
          animationCallbackId = setTimeout(function () {
            if (typeof callback === "function") callback();
          }, animationTime);
        }
        animationStates = [];
      },

      animate(target, currentRect, toRect, duration) {
        if (duration) {
          css(target, "transition", "");
          css(target, "transform", "");
          let elMatrix = matrix(this.el),
            scaleX = elMatrix && elMatrix.a,
            scaleY = elMatrix && elMatrix.d,
            translateX = (currentRect.left - toRect.left) / (scaleX || 1),
            translateY = (currentRect.top - toRect.top) / (scaleY || 1);

          target.animatingX = !!translateX;
          target.animatingY = !!translateY;

          css(
            target,
            "transform",
            "translate3d(" + translateX + "px," + translateY + "px,0)"
          );

          this.forRepaintDummy = repaint(target); // repaint

          css(
            target,
            "transition",
            "transform " +
              duration +
              "ms" +
              (this.options.easing ? " " + this.options.easing : "")
          );
          css(target, "transform", "translate3d(0,0,0)");
          typeof target.animated === "number" && clearTimeout(target.animated);
          target.animated = setTimeout(function () {
            css(target, "transition", "");
            css(target, "transform", "");
            target.animated = false;

            target.animatingX = false;
            target.animatingY = false;
          }, duration);
        }
      },
    };
  }

  function repaint(target) {
    return target.offsetWidth;
  }

  function calculateRealTime(animatingRect, fromRect, toRect, options) {
    return (
      (Math.sqrt(
        Math.pow(fromRect.top - animatingRect.top, 2) +
          Math.pow(fromRect.left - animatingRect.left, 2)
      ) /
        Math.sqrt(
          Math.pow(fromRect.top - toRect.top, 2) +
            Math.pow(fromRect.left - toRect.left, 2)
        )) *
      options.animation
    );
  }

  let plugins = [];

  const defaults = {
    initializeByDefault: true,
  };

  var PluginManager = {
    mount(plugin) {
      // Set default static properties
      for (let option in defaults) {
        if (defaults.hasOwnProperty(option) && !(option in plugin)) {
          plugin[option] = defaults[option];
        }
      }
      plugins.push(plugin);
    },
    pluginEvent(eventName, sortable, evt) {
      this.eventCanceled = false;
      evt.cancel = () => {
        this.eventCanceled = true;
      };
      const eventNameGlobal = eventName + "Global";
      plugins.forEach((plugin) => {
        if (!sortable[plugin.pluginName]) return;
        // Fire global events if it exists in this sortable
        if (sortable[plugin.pluginName][eventNameGlobal]) {
          sortable[plugin.pluginName][eventNameGlobal]({ sortable, ...evt });
        }

        // Only fire plugin event if plugin is enabled in this sortable,
        // and plugin has event defined
        if (
          sortable.options[plugin.pluginName] &&
          sortable[plugin.pluginName][eventName]
        ) {
          sortable[plugin.pluginName][eventName]({ sortable, ...evt });
        }
      });
    },
    initializePlugins(sortable, el, defaults, options) {
      plugins.forEach((plugin) => {
        const pluginName = plugin.pluginName;
        if (!sortable.options[pluginName] && !plugin.initializeByDefault)
          return;

        let initialized = new plugin(sortable, el, sortable.options);
        initialized.sortable = sortable;
        initialized.options = sortable.options;
        sortable[pluginName] = initialized;

        // Add default options from plugin
        Object.assign(defaults, initialized.defaults);
      });

      for (let option in sortable.options) {
        if (!sortable.options.hasOwnProperty(option)) continue;
        let modified = this.modifyOption(
          sortable,
          option,
          sortable.options[option]
        );
        if (typeof modified !== "undefined") {
          sortable.options[option] = modified;
        }
      }
    },
    getEventProperties(name, sortable) {
      let eventProperties = {};
      plugins.forEach((plugin) => {
        if (typeof plugin.eventProperties !== "function") return;
        Object.assign(
          eventProperties,
          plugin.eventProperties.call(sortable[plugin.pluginName], name)
        );
      });

      return eventProperties;
    },
    modifyOption(sortable, name, value) {
      let modifiedValue;
      plugins.forEach((plugin) => {
        // Plugin must exist on the Sortable
        if (!sortable[plugin.pluginName]) return;

        // If static option listener exists for this option, call in the context of the Sortable's instance of this plugin
        if (
          plugin.optionListeners &&
          typeof plugin.optionListeners[name] === "function"
        ) {
          modifiedValue = plugin.optionListeners[name].call(
            sortable[plugin.pluginName],
            value
          );
        }
      });

      return modifiedValue;
    },
  };

  function dispatchEvent({
    sortable,
    rootEl,
    name,
    targetEl,
    cloneEl,
    toEl,
    fromEl,
    oldIndex,
    newIndex,
    oldDraggableIndex,
    newDraggableIndex,
    originalEvent,
    putSortable,
    extraEventProperties,
  }) {
    sortable = sortable || (rootEl && rootEl[expando]);
    if (!sortable) return;

    let evt,
      options = sortable.options,
      onName = "on" + name.charAt(0).toUpperCase() + name.substr(1);
    // Support for new CustomEvent feature
    if (window.CustomEvent && !IE11OrLess && !Edge) {
      evt = new CustomEvent(name, {
        bubbles: true,
        cancelable: true,
      });
    } else {
      evt = document.createEvent("Event");
      evt.initEvent(name, true, true);
    }

    evt.to = toEl || rootEl;
    evt.from = fromEl || rootEl;
    evt.item = targetEl || rootEl;
    evt.clone = cloneEl;

    evt.oldIndex = oldIndex;
    evt.newIndex = newIndex;

    evt.oldDraggableIndex = oldDraggableIndex;
    evt.newDraggableIndex = newDraggableIndex;

    evt.originalEvent = originalEvent;
    evt.pullMode = putSortable ? putSortable.lastPutMode : undefined;

    let allEventProperties = {
      ...extraEventProperties,
      ...PluginManager.getEventProperties(name, sortable),
    };
    for (let option in allEventProperties) {
      evt[option] = allEventProperties[option];
    }

    if (rootEl) {
      rootEl.dispatchEvent(evt);
    }

    if (options[onName]) {
      options[onName].call(sortable, evt);
    }
  }

  /**!
   * Sortable
   * @author	RubaXa   <trash@rubaxa.org>
   * @author	owenm    <owen23355@gmail.com>
   * @license MIT
   */

  let pluginEvent = function (
    eventName,
    sortable,
    { evt: originalEvent, ...data } = {}
  ) {
    PluginManager.pluginEvent.bind(Sortable)(eventName, sortable, {
      dragEl,
      parentEl,
      ghostEl,
      rootEl,
      nextEl,
      lastDownEl,
      cloneEl,
      cloneHidden,
      dragStarted: moved,
      putSortable,
      activeSortable: Sortable.active,
      originalEvent,

      oldIndex,
      oldDraggableIndex,
      newIndex,
      newDraggableIndex,

      hideGhostForTarget: _hideGhostForTarget,
      unhideGhostForTarget: _unhideGhostForTarget,

      cloneNowHidden() {
        cloneHidden = true;
      },
      cloneNowShown() {
        cloneHidden = false;
      },

      dispatchSortableEvent(name) {
        _dispatchEvent({ sortable, name, originalEvent });
      },

      ...data,
    });
  };

  function _dispatchEvent(info) {
    dispatchEvent({
      putSortable,
      cloneEl,
      targetEl: dragEl,
      rootEl,
      oldIndex,
      oldDraggableIndex,
      newIndex,
      newDraggableIndex,
      ...info,
    });
  }

  let dragEl,
    parentEl,
    ghostEl,
    rootEl,
    nextEl,
    lastDownEl,
    cloneEl,
    cloneHidden,
    oldIndex,
    newIndex,
    oldDraggableIndex,
    newDraggableIndex,
    activeGroup,
    putSortable,
    awaitingDragStarted = false,
    ignoreNextClick = false,
    sortables = [],
    tapEvt,
    touchEvt,
    lastDx,
    lastDy,
    tapDistanceLeft,
    tapDistanceTop,
    moved,
    lastTarget,
    lastDirection,
    pastFirstInvertThresh = false,
    isCircumstantialInvert = false,
    targetMoveDistance,
    // For positioning ghost absolutely
    ghostRelativeParent,
    ghostRelativeParentInitialScroll = [], // (left, top)
    _silent = false,
    savedInputChecked = [];

  /** @const */
  const documentExists = typeof document !== "undefined",
    PositionGhostAbsolutely = IOS,
    CSSFloatProperty = Edge || IE11OrLess ? "cssFloat" : "float",
    // This will not pass for IE9, because IE9 DnD only works on anchors
    supportDraggable =
      documentExists &&
      !ChromeForAndroid &&
      !IOS &&
      "draggable" in document.createElement("div"),
    supportCssPointerEvents = (function () {
      if (!documentExists) return;
      // false when <= IE11
      if (IE11OrLess) {
        return false;
      }
      let el = document.createElement("x");
      el.style.cssText = "pointer-events:auto";
      return el.style.pointerEvents === "auto";
    })(),
    _detectDirection = function (el, options) {
      let elCSS = css(el),
        elWidth =
          parseInt(elCSS.width) -
          parseInt(elCSS.paddingLeft) -
          parseInt(elCSS.paddingRight) -
          parseInt(elCSS.borderLeftWidth) -
          parseInt(elCSS.borderRightWidth),
        child1 = getChild(el, 0, options),
        child2 = getChild(el, 1, options),
        firstChildCSS = child1 && css(child1),
        secondChildCSS = child2 && css(child2),
        firstChildWidth =
          firstChildCSS &&
          parseInt(firstChildCSS.marginLeft) +
            parseInt(firstChildCSS.marginRight) +
            getRect(child1).width,
        secondChildWidth =
          secondChildCSS &&
          parseInt(secondChildCSS.marginLeft) +
            parseInt(secondChildCSS.marginRight) +
            getRect(child2).width;

      if (elCSS.display === "flex") {
        return elCSS.flexDirection === "column" ||
          elCSS.flexDirection === "column-reverse"
          ? "vertical"
          : "horizontal";
      }

      if (elCSS.display === "grid") {
        return elCSS.gridTemplateColumns.split(" ").length <= 1
          ? "vertical"
          : "horizontal";
      }

      if (child1 && firstChildCSS.float && firstChildCSS.float !== "none") {
        let touchingSideChild2 =
          firstChildCSS.float === "left" ? "left" : "right";

        return child2 &&
          (secondChildCSS.clear === "both" ||
            secondChildCSS.clear === touchingSideChild2)
          ? "vertical"
          : "horizontal";
      }

      return child1 &&
        (firstChildCSS.display === "block" ||
          firstChildCSS.display === "flex" ||
          firstChildCSS.display === "table" ||
          firstChildCSS.display === "grid" ||
          (firstChildWidth >= elWidth && elCSS[CSSFloatProperty] === "none") ||
          (child2 &&
            elCSS[CSSFloatProperty] === "none" &&
            firstChildWidth + secondChildWidth > elWidth))
        ? "vertical"
        : "horizontal";
    },
    _dragElInRowColumn = function (dragRect, targetRect, vertical) {
      let dragElS1Opp = vertical ? dragRect.left : dragRect.top,
        dragElS2Opp = vertical ? dragRect.right : dragRect.bottom,
        dragElOppLength = vertical ? dragRect.width : dragRect.height,
        targetS1Opp = vertical ? targetRect.left : targetRect.top,
        targetS2Opp = vertical ? targetRect.right : targetRect.bottom,
        targetOppLength = vertical ? targetRect.width : targetRect.height;

      return (
        dragElS1Opp === targetS1Opp ||
        dragElS2Opp === targetS2Opp ||
        dragElS1Opp + dragElOppLength / 2 === targetS1Opp + targetOppLength / 2
      );
    },
    /**
     * Detects first nearest empty sortable to X and Y position using emptyInsertThreshold.
     * @param  {Number} x      X position
     * @param  {Number} y      Y position
     * @return {HTMLElement}   Element of the first found nearest Sortable
     */
    _detectNearestEmptySortable = function (x, y) {
      let ret;
      sortables.some((sortable) => {
        if (lastChild(sortable)) return;

        let rect = getRect(sortable),
          threshold = sortable[expando].options.emptyInsertThreshold,
          insideHorizontally =
            x >= rect.left - threshold && x <= rect.right + threshold,
          insideVertically =
            y >= rect.top - threshold && y <= rect.bottom + threshold;

        if (threshold && insideHorizontally && insideVertically) {
          return (ret = sortable);
        }
      });
      return ret;
    },
    _prepareGroup = function (options) {
      function toFn(value, pull) {
        return function (to, from, dragEl, evt) {
          let sameGroup =
            to.options.group.name &&
            from.options.group.name &&
            to.options.group.name === from.options.group.name;

          if (value == null && (pull || sameGroup)) {
            // Default pull value
            // Default pull and put value if same group
            return true;
          } else if (value == null || value === false) {
            return false;
          } else if (pull && value === "clone") {
            return value;
          } else if (typeof value === "function") {
            return toFn(value(to, from, dragEl, evt), pull)(
              to,
              from,
              dragEl,
              evt
            );
          } else {
            let otherGroup = (pull ? to : from).options.group.name;

            return (
              value === true ||
              (typeof value === "string" && value === otherGroup) ||
              (value.join && value.indexOf(otherGroup) > -1)
            );
          }
        };
      }

      let group = {};
      let originalGroup = options.group;

      if (!originalGroup || typeof originalGroup != "object") {
        originalGroup = { name: originalGroup };
      }

      group.name = originalGroup.name;
      group.checkPull = toFn(originalGroup.pull, true);
      group.checkPut = toFn(originalGroup.put);
      group.revertClone = originalGroup.revertClone;

      options.group = group;
    },
    _hideGhostForTarget = function () {
      if (!supportCssPointerEvents && ghostEl) {
        css(ghostEl, "display", "none");
      }
    },
    _unhideGhostForTarget = function () {
      if (!supportCssPointerEvents && ghostEl) {
        css(ghostEl, "display", "");
      }
    };

  // #1184 fix - Prevent click event on fallback if dragged but item not changed position
  if (documentExists) {
    document.addEventListener(
      "click",
      function (evt) {
        if (ignoreNextClick) {
          evt.preventDefault();
          evt.stopPropagation && evt.stopPropagation();
          evt.stopImmediatePropagation && evt.stopImmediatePropagation();
          ignoreNextClick = false;
          return false;
        }
      },
      true
    );
  }

  let nearestEmptyInsertDetectEvent = function (evt) {
    if (dragEl) {
      evt = evt.touches ? evt.touches[0] : evt;
      let nearest = _detectNearestEmptySortable(evt.clientX, evt.clientY);

      if (nearest) {
        // Create imitation event
        let event = {};
        for (let i in evt) {
          if (evt.hasOwnProperty(i)) {
            event[i] = evt[i];
          }
        }
        event.target = event.rootEl = nearest;
        event.preventDefault = void 0;
        event.stopPropagation = void 0;
        nearest[expando]._onDragOver(event);
      }
    }
  };

  let _checkOutsideTargetEl = function (evt) {
    if (dragEl) {
      dragEl.parentNode[expando]._isOutsideThisEl(evt.target);
    }
  };

  /**
   * @class  Sortable
   * @param  {HTMLElement}  el
   * @param  {Object}       [options]
   */
  function Sortable(el, options) {
    if (!(el && el.nodeType && el.nodeType === 1)) {
      throw `Sortable: \`el\` must be an HTMLElement, not ${{}.toString.call(
        el
      )}`;
    }

    this.el = el; // root element
    this.options = options = Object.assign({}, options);

    // Export instance
    el[expando] = this;

    let defaults = {
      group: null,
      sort: true,
      disabled: false,
      store: null,
      handle: null,
      draggable: /^[uo]l$/i.test(el.nodeName) ? ">li" : ">*",
      swapThreshold: 1, // percentage; 0 <= x <= 1
      invertSwap: false, // invert always
      invertedSwapThreshold: null, // will be set to same as swapThreshold if default
      removeCloneOnHide: true,
      direction: function () {
        return _detectDirection(el, this.options);
      },
      ghostClass: "sortable-ghost",
      chosenClass: "sortable-chosen",
      dragClass: "sortable-drag",
      ignore: "a, img",
      filter: null,
      preventOnFilter: true,
      animation: 0,
      easing: null,
      setData: function (dataTransfer, dragEl) {
        dataTransfer.setData("Text", dragEl.textContent);
      },
      dropBubble: false,
      dragoverBubble: false,
      dataIdAttr: "data-id",
      delay: 0,
      delayOnTouchOnly: false,
      touchStartThreshold:
        (Number.parseInt ? Number : window).parseInt(
          window.devicePixelRatio,
          10
        ) || 1,
      forceFallback: false,
      fallbackClass: "sortable-fallback",
      fallbackOnBody: false,
      fallbackTolerance: 0,
      fallbackOffset: { x: 0, y: 0 },
      supportPointer:
        Sortable.supportPointer !== false && "PointerEvent" in window,
      emptyInsertThreshold: 5,
    };

    PluginManager.initializePlugins(this, el, defaults);

    // Set default options
    for (let name in defaults) {
      !(name in options) && (options[name] = defaults[name]);
    }

    _prepareGroup(options);

    // Bind all private methods
    for (let fn in this) {
      if (fn.charAt(0) === "_" && typeof this[fn] === "function") {
        this[fn] = this[fn].bind(this);
      }
    }

    // Setup drag mode
    this.nativeDraggable = options.forceFallback ? false : supportDraggable;

    if (this.nativeDraggable) {
      // Touch start threshold cannot be greater than the native dragstart threshold
      this.options.touchStartThreshold = 1;
    }

    // Bind events
    if (options.supportPointer) {
      on(el, "pointerdown", this._onTapStart);
    } else {
      on(el, "mousedown", this._onTapStart);
      on(el, "touchstart", this._onTapStart);
    }

    if (this.nativeDraggable) {
      on(el, "dragover", this);
      on(el, "dragenter", this);
    }

    sortables.push(this.el);

    // Restore sorting
    options.store &&
      options.store.get &&
      this.sort(options.store.get(this) || []);

    // Add animation state manager
    Object.assign(this, AnimationStateManager());
  }

  Sortable.prototype = /** @lends Sortable.prototype */ {
    constructor: Sortable,

    _isOutsideThisEl: function (target) {
      if (!this.el.contains(target) && target !== this.el) {
        lastTarget = null;
      }
    },

    _getDirection: function (evt, target) {
      return typeof this.options.direction === "function"
        ? this.options.direction.call(this, evt, target, dragEl)
        : this.options.direction;
    },

    _onTapStart: function (/** Event|TouchEvent */ evt) {
      if (!evt.cancelable) return;
      let _this = this,
        el = this.el,
        options = this.options,
        preventOnFilter = options.preventOnFilter,
        type = evt.type,
        touch =
          (evt.touches && evt.touches[0]) ||
          (evt.pointerType && evt.pointerType === "touch" && evt),
        target = (touch || evt).target,
        originalTarget =
          (evt.target.shadowRoot &&
            ((evt.path && evt.path[0]) ||
              (evt.composedPath && evt.composedPath()[0]))) ||
          target,
        filter = options.filter;

      _saveInputCheckedState(el);

      // Don't trigger start event when an element is been dragged, otherwise the evt.oldindex always wrong when set option.group.
      if (dragEl) {
        return;
      }

      if (
        (/mousedown|pointerdown/.test(type) && evt.button !== 0) ||
        options.disabled
      ) {
        return; // only left button and enabled
      }

      // cancel dnd if original target is content editable
      if (originalTarget.isContentEditable) {
        return;
      }

      // Safari ignores further event handling after mousedown
      if (
        !this.nativeDraggable &&
        Safari &&
        target &&
        target.tagName.toUpperCase() === "SELECT"
      ) {
        return;
      }

      target = closest(target, options.draggable, el, false);

      if (target && target.animated) {
        return;
      }

      if (lastDownEl === target) {
        // Ignoring duplicate `down`
        return;
      }

      // Get the index of the dragged element within its parent
      oldIndex = index(target);
      oldDraggableIndex = index(target, options.draggable);

      // Check filter
      if (typeof filter === "function") {
        if (filter.call(this, evt, target, this)) {
          _dispatchEvent({
            sortable: _this,
            rootEl: originalTarget,
            name: "filter",
            targetEl: target,
            toEl: el,
            fromEl: el,
          });
          pluginEvent("filter", _this, { evt });
          preventOnFilter && evt.cancelable && evt.preventDefault();
          return; // cancel dnd
        }
      } else if (filter) {
        filter = filter.split(",").some(function (criteria) {
          criteria = closest(originalTarget, criteria.trim(), el, false);

          if (criteria) {
            _dispatchEvent({
              sortable: _this,
              rootEl: criteria,
              name: "filter",
              targetEl: target,
              fromEl: el,
              toEl: el,
            });
            pluginEvent("filter", _this, { evt });
            return true;
          }
        });

        if (filter) {
          preventOnFilter && evt.cancelable && evt.preventDefault();
          return; // cancel dnd
        }
      }

      if (
        options.handle &&
        !closest(originalTarget, options.handle, el, false)
      ) {
        return;
      }

      // Prepare `dragstart`
      this._prepareDragStart(evt, touch, target);
    },

    _prepareDragStart: function (
      /** Event */ evt,
      /** Touch */ touch,
      /** HTMLElement */ target
    ) {
      let _this = this,
        el = _this.el,
        options = _this.options,
        ownerDocument = el.ownerDocument,
        dragStartFn;

      if (target && !dragEl && target.parentNode === el) {
        let dragRect = getRect(target);
        rootEl = el;
        dragEl = target;
        parentEl = dragEl.parentNode;
        nextEl = dragEl.nextSibling;
        lastDownEl = target;
        activeGroup = options.group;

        Sortable.dragged = dragEl;

        tapEvt = {
          target: dragEl,
          clientX: (touch || evt).clientX,
          clientY: (touch || evt).clientY,
        };

        tapDistanceLeft = tapEvt.clientX - dragRect.left;
        tapDistanceTop = tapEvt.clientY - dragRect.top;

        this._lastX = (touch || evt).clientX;
        this._lastY = (touch || evt).clientY;

        dragEl.style["will-change"] = "all";

        dragStartFn = function () {
          pluginEvent("delayEnded", _this, { evt });
          if (Sortable.eventCanceled) {
            _this._onDrop();
            return;
          }
          // Delayed drag has been triggered
          // we can re-enable the events: touchmove/mousemove
          _this._disableDelayedDragEvents();

          if (!FireFox && _this.nativeDraggable) {
            dragEl.draggable = true;
          }

          // Bind the events: dragstart/dragend
          _this._triggerDragStart(evt, touch);

          // Drag start event
          _dispatchEvent({
            sortable: _this,
            name: "choose",
            originalEvent: evt,
          });

          // Chosen item
          toggleClass(dragEl, options.chosenClass, true);
        };

        // Disable "draggable"
        options.ignore.split(",").forEach(function (criteria) {
          find(dragEl, criteria.trim(), _disableDraggable);
        });

        on(ownerDocument, "dragover", nearestEmptyInsertDetectEvent);
        on(ownerDocument, "mousemove", nearestEmptyInsertDetectEvent);
        on(ownerDocument, "touchmove", nearestEmptyInsertDetectEvent);

        on(ownerDocument, "mouseup", _this._onDrop);
        on(ownerDocument, "touchend", _this._onDrop);
        on(ownerDocument, "touchcancel", _this._onDrop);

        // Make dragEl draggable (must be before delay for FireFox)
        if (FireFox && this.nativeDraggable) {
          this.options.touchStartThreshold = 4;
          dragEl.draggable = true;
        }

        pluginEvent("delayStart", this, { evt });

        // Delay is impossible for native DnD in Edge or IE
        if (
          options.delay &&
          (!options.delayOnTouchOnly || touch) &&
          (!this.nativeDraggable || !(Edge || IE11OrLess))
        ) {
          if (Sortable.eventCanceled) {
            this._onDrop();
            return;
          }
          // If the user moves the pointer or let go the click or touch
          // before the delay has been reached:
          // disable the delayed drag
          on(ownerDocument, "mouseup", _this._disableDelayedDrag);
          on(ownerDocument, "touchend", _this._disableDelayedDrag);
          on(ownerDocument, "touchcancel", _this._disableDelayedDrag);
          on(ownerDocument, "mousemove", _this._delayedDragTouchMoveHandler);
          on(ownerDocument, "touchmove", _this._delayedDragTouchMoveHandler);
          options.supportPointer &&
            on(
              ownerDocument,
              "pointermove",
              _this._delayedDragTouchMoveHandler
            );

          _this._dragStartTimer = setTimeout(dragStartFn, options.delay);
        } else {
          dragStartFn();
        }
      }
    },

    _delayedDragTouchMoveHandler: function (/** TouchEvent|PointerEvent **/ e) {
      let touch = e.touches ? e.touches[0] : e;
      if (
        Math.max(
          Math.abs(touch.clientX - this._lastX),
          Math.abs(touch.clientY - this._lastY)
        ) >=
        Math.floor(
          this.options.touchStartThreshold /
            ((this.nativeDraggable && window.devicePixelRatio) || 1)
        )
      ) {
        this._disableDelayedDrag();
      }
    },

    _disableDelayedDrag: function () {
      dragEl && _disableDraggable(dragEl);
      clearTimeout(this._dragStartTimer);

      this._disableDelayedDragEvents();
    },

    _disableDelayedDragEvents: function () {
      let ownerDocument = this.el.ownerDocument;
      off(ownerDocument, "mouseup", this._disableDelayedDrag);
      off(ownerDocument, "touchend", this._disableDelayedDrag);
      off(ownerDocument, "touchcancel", this._disableDelayedDrag);
      off(ownerDocument, "mousemove", this._delayedDragTouchMoveHandler);
      off(ownerDocument, "touchmove", this._delayedDragTouchMoveHandler);
      off(ownerDocument, "pointermove", this._delayedDragTouchMoveHandler);
    },

    _triggerDragStart: function (/** Event */ evt, /** Touch */ touch) {
      touch = touch || (evt.pointerType == "touch" && evt);

      if (!this.nativeDraggable || touch) {
        if (this.options.supportPointer) {
          on(document, "pointermove", this._onTouchMove);
        } else if (touch) {
          on(document, "touchmove", this._onTouchMove);
        } else {
          on(document, "mousemove", this._onTouchMove);
        }
      } else {
        on(dragEl, "dragend", this);
        on(rootEl, "dragstart", this._onDragStart);
      }

      try {
        if (document.selection) {
          // Timeout neccessary for IE9
          _nextTick(function () {
            document.selection.empty();
          });
        } else {
          window.getSelection().removeAllRanges();
        }
      } catch (err) {}
    },

    _dragStarted: function (fallback, evt) {
      awaitingDragStarted = false;
      if (rootEl && dragEl) {
        pluginEvent("dragStarted", this, { evt });

        if (this.nativeDraggable) {
          on(document, "dragover", _checkOutsideTargetEl);
        }
        let options = this.options;

        // Apply effect
        !fallback && toggleClass(dragEl, options.dragClass, false);
        toggleClass(dragEl, options.ghostClass, true);

        Sortable.active = this;

        fallback && this._appendGhost();

        // Drag start event
        _dispatchEvent({
          sortable: this,
          name: "start",
          originalEvent: evt,
        });
      } else {
        this._nulling();
      }
    },

    _emulateDragOver: function () {
      if (touchEvt) {
        this._lastX = touchEvt.clientX;
        this._lastY = touchEvt.clientY;

        _hideGhostForTarget();

        let target = document.elementFromPoint(
          touchEvt.clientX,
          touchEvt.clientY
        );
        let parent = target;

        while (target && target.shadowRoot) {
          target = target.shadowRoot.elementFromPoint(
            touchEvt.clientX,
            touchEvt.clientY
          );
          if (target === parent) break;
          parent = target;
        }

        dragEl.parentNode[expando]._isOutsideThisEl(target);

        if (parent) {
          do {
            if (parent[expando]) {
              let inserted;

              inserted = parent[expando]._onDragOver({
                clientX: touchEvt.clientX,
                clientY: touchEvt.clientY,
                target: target,
                rootEl: parent,
              });

              if (inserted && !this.options.dragoverBubble) {
                break;
              }
            }

            target = parent; // store last element
          } while (
            /* jshint boss:true */
            (parent = parent.parentNode)
          );
        }

        _unhideGhostForTarget();
      }
    },

    _onTouchMove: function (/**TouchEvent*/ evt) {
      if (tapEvt) {
        let options = this.options,
          fallbackTolerance = options.fallbackTolerance,
          fallbackOffset = options.fallbackOffset,
          touch = evt.touches ? evt.touches[0] : evt,
          ghostMatrix = ghostEl && matrix(ghostEl, true),
          scaleX = ghostEl && ghostMatrix && ghostMatrix.a,
          scaleY = ghostEl && ghostMatrix && ghostMatrix.d,
          relativeScrollOffset =
            PositionGhostAbsolutely &&
            ghostRelativeParent &&
            getRelativeScrollOffset(ghostRelativeParent),
          dx =
            (touch.clientX - tapEvt.clientX + fallbackOffset.x) /
              (scaleX || 1) +
            (relativeScrollOffset
              ? relativeScrollOffset[0] - ghostRelativeParentInitialScroll[0]
              : 0) /
              (scaleX || 1),
          dy =
            (touch.clientY - tapEvt.clientY + fallbackOffset.y) /
              (scaleY || 1) +
            (relativeScrollOffset
              ? relativeScrollOffset[1] - ghostRelativeParentInitialScroll[1]
              : 0) /
              (scaleY || 1);

        // only set the status to dragging, when we are actually dragging
        if (!Sortable.active && !awaitingDragStarted) {
          if (
            fallbackTolerance &&
            Math.max(
              Math.abs(touch.clientX - this._lastX),
              Math.abs(touch.clientY - this._lastY)
            ) < fallbackTolerance
          ) {
            return;
          }
          this._onDragStart(evt, true);
        }

        if (ghostEl) {
          if (ghostMatrix) {
            ghostMatrix.e += dx - (lastDx || 0);
            ghostMatrix.f += dy - (lastDy || 0);
          } else {
            ghostMatrix = {
              a: 1,
              b: 0,
              c: 0,
              d: 1,
              e: dx,
              f: dy,
            };
          }

          let cssMatrix = `matrix(${ghostMatrix.a},${ghostMatrix.b},${ghostMatrix.c},${ghostMatrix.d},${ghostMatrix.e},${ghostMatrix.f})`;

          css(ghostEl, "webkitTransform", cssMatrix);
          css(ghostEl, "mozTransform", cssMatrix);
          css(ghostEl, "msTransform", cssMatrix);
          css(ghostEl, "transform", cssMatrix);

          lastDx = dx;
          lastDy = dy;

          touchEvt = touch;
        }
        
        // on mouse move
        if (options.onMouseMove) options.onMouseMove({
          sortable: this,
          name: "mousemove",
          originalEvent: evt,
        });

        evt.cancelable && evt.preventDefault();
      }
    },

    _appendGhost: function () {
      // Bug if using scale(): https://stackoverflow.com/questions/2637058
      // Not being adjusted for
      if (!ghostEl) {
        let container = this.options.fallbackOnBody ? document.body : rootEl,
          rect = getRect(
            dragEl,
            true,
            PositionGhostAbsolutely,
            true,
            container
          ),
          options = this.options;

        // Position absolutely
        if (PositionGhostAbsolutely) {
          // Get relatively positioned parent
          ghostRelativeParent = container;

          while (
            css(ghostRelativeParent, "position") === "static" &&
            css(ghostRelativeParent, "transform") === "none" &&
            ghostRelativeParent !== document
          ) {
            ghostRelativeParent = ghostRelativeParent.parentNode;
          }

          if (
            ghostRelativeParent !== document.body &&
            ghostRelativeParent !== document.documentElement
          ) {
            if (ghostRelativeParent === document)
              ghostRelativeParent = getWindowScrollingElement();

            rect.top += ghostRelativeParent.scrollTop;
            rect.left += ghostRelativeParent.scrollLeft;
          } else {
            ghostRelativeParent = getWindowScrollingElement();
          }
          ghostRelativeParentInitialScroll = getRelativeScrollOffset(
            ghostRelativeParent
          );
        }

        ghostEl = dragEl.cloneNode(true);

        toggleClass(ghostEl, options.ghostClass, false);
        toggleClass(ghostEl, options.fallbackClass, true);
        toggleClass(ghostEl, options.dragClass, true);

        css(ghostEl, "transition", "");
        css(ghostEl, "transform", "");

        css(ghostEl, "box-sizing", "border-box");
        css(ghostEl, "margin", 0);
        css(ghostEl, "top", rect.top);
        css(ghostEl, "left", rect.left);
        css(ghostEl, "width", rect.width);
        css(ghostEl, "height", rect.height);
        css(ghostEl, "opacity", "0.8");
        css(
          ghostEl,
          "position",
          PositionGhostAbsolutely ? "absolute" : "fixed"
        );
        css(ghostEl, "zIndex", "100000");
        css(ghostEl, "pointerEvents", "none");

        Sortable.ghost = ghostEl;

        container.appendChild(ghostEl);

        // Set transform-origin
        css(
          ghostEl,
          "transform-origin",
          (tapDistanceLeft / parseInt(ghostEl.style.width)) * 100 +
            "% " +
            (tapDistanceTop / parseInt(ghostEl.style.height)) * 100 +
            "%"
        );
      }
    },

    _onDragStart: function (/**Event*/ evt, /**boolean*/ fallback) {
      let _this = this;
      let dataTransfer = evt.dataTransfer;
      let options = _this.options;

      pluginEvent("dragStart", this, { evt });
      if (Sortable.eventCanceled) {
        this._onDrop();
        return;
      }

      pluginEvent("setupClone", this);
      if (!Sortable.eventCanceled) {
        cloneEl = clone(dragEl);

        cloneEl.draggable = false;
        cloneEl.style["will-change"] = "";

        this._hideClone();

        toggleClass(cloneEl, this.options.chosenClass, false);
        Sortable.clone = cloneEl;
      }

      // #1143: IFrame support workaround
      _this.cloneId = _nextTick(function () {
        pluginEvent("clone", _this);
        if (Sortable.eventCanceled) return;

        if (!_this.options.removeCloneOnHide) {
          rootEl.insertBefore(cloneEl, dragEl);
        }
        _this._hideClone();

        _dispatchEvent({
          sortable: _this,
          name: "clone",
        });
      });

      !fallback && toggleClass(dragEl, options.dragClass, true);

      // Set proper drop events
      if (fallback) {
        ignoreNextClick = true;
        _this._loopId = setInterval(_this._emulateDragOver, 50);
      } else {
        // Undo what was set in _prepareDragStart before drag started
        off(document, "mouseup", _this._onDrop);
        off(document, "touchend", _this._onDrop);
        off(document, "touchcancel", _this._onDrop);

        if (dataTransfer) {
          dataTransfer.effectAllowed = "move";
          options.setData && options.setData.call(_this, dataTransfer, dragEl);
        }

        on(document, "drop", _this);

        // #1276 fix:
        css(dragEl, "transform", "translateZ(0)");
      }

      awaitingDragStarted = true;

      _this._dragStartId = _nextTick(
        _this._dragStarted.bind(_this, fallback, evt)
      );
      on(document, "selectstart", _this);

      moved = true;

      if (Safari) {
        css(document.body, "user-select", "none");
      }
    },

    // Returns true - if no further action is needed (either inserted or another condition)
    _onDragOver: function (/**Event*/ evt) {
      let el = this.el,
        target = evt.target,
        dragRect,
        targetRect,
        revert,
        options = this.options,
        group = options.group,
        activeSortable = Sortable.active,
        isOwner = activeGroup === group,
        canSort = options.sort,
        fromSortable = putSortable || activeSortable,
        vertical,
        _this = this,
        completedFired = false;

      if (_silent) return;

      function dragOverEvent(name, extra) {
        pluginEvent(name, _this, {
          evt,
          isOwner,
          axis: vertical ? "vertical" : "horizontal",
          revert,
          dragRect,
          targetRect,
          canSort,
          fromSortable,
          target,
          completed,
          onMove(target, after) {
            return onMove(
              rootEl,
              el,
              dragEl,
              dragRect,
              target,
              getRect(target),
              evt,
              after
            );
          },
          changed,
          ...extra,
        });
      }

      // Capture animation state
      function capture() {
        dragOverEvent("dragOverAnimationCapture");

        _this.captureAnimationState();
        if (_this !== fromSortable) {
          fromSortable.captureAnimationState();
        }
      }

      // Return invocation when dragEl is inserted (or completed)
      function completed(insertion) {
        dragOverEvent("dragOverCompleted", { insertion });

        if (insertion) {
          // Clones must be hidden before folding animation to capture dragRectAbsolute properly
          if (isOwner) {
            activeSortable._hideClone();
          } else {
            activeSortable._showClone(_this);
          }

          if (_this !== fromSortable) {
            // Set ghost class to new sortable's ghost class
            toggleClass(
              dragEl,
              putSortable
                ? putSortable.options.ghostClass
                : activeSortable.options.ghostClass,
              false
            );
            toggleClass(dragEl, options.ghostClass, true);
          }

          if (putSortable !== _this && _this !== Sortable.active) {
            putSortable = _this;
          } else if (_this === Sortable.active && putSortable) {
            putSortable = null;
          }

          // Animation
          if (fromSortable === _this) {
            _this._ignoreWhileAnimating = target;
          }
          _this.animateAll(function () {
            dragOverEvent("dragOverAnimationComplete");
            _this._ignoreWhileAnimating = null;
          });
          if (_this !== fromSortable) {
            fromSortable.animateAll();
            fromSortable._ignoreWhileAnimating = null;
          }
        }

        // Null lastTarget if it is not inside a previously swapped element
        if (
          (target === dragEl && !dragEl.animated) ||
          (target === el && !target.animated)
        ) {
          lastTarget = null;
        }

        // no bubbling and not fallback
        if (!options.dragoverBubble && !evt.rootEl && target !== document) {
          dragEl.parentNode[expando]._isOutsideThisEl(evt.target);

          // Do not detect for empty insert if already inserted
          !insertion && nearestEmptyInsertDetectEvent(evt);
        }

        !options.dragoverBubble && evt.stopPropagation && evt.stopPropagation();

        return (completedFired = true);
      }

      // Call when dragEl has been inserted
      function changed() {
        newIndex = index(dragEl);
        newDraggableIndex = index(dragEl, options.draggable);
        _dispatchEvent({
          sortable: _this,
          name: "change",
          toEl: el,
          newIndex,
          newDraggableIndex,
          originalEvent: evt,
        });
      }

      if (evt.preventDefault !== void 0) {
        evt.cancelable && evt.preventDefault();
      }

      target = closest(target, options.draggable, el, true);

      dragOverEvent("dragOver");
      if (Sortable.eventCanceled) return completedFired;

      if (
        dragEl.contains(evt.target) ||
        (target.animated && target.animatingX && target.animatingY) ||
        _this._ignoreWhileAnimating === target
      ) {
        return completed(false);
      }

      ignoreNextClick = false;

      if (
        activeSortable &&
        !options.disabled &&
        (isOwner
          ? canSort || (revert = !rootEl.contains(dragEl)) // Reverting item into the original list
          : putSortable === this ||
            ((this.lastPutMode = activeGroup.checkPull(
              this,
              activeSortable,
              dragEl,
              evt
            )) &&
              group.checkPut(this, activeSortable, dragEl, evt)))
      ) {
        vertical = this._getDirection(evt, target) === "vertical";

        dragRect = getRect(dragEl);

        dragOverEvent("dragOverValid");
        if (Sortable.eventCanceled) return completedFired;

        if (revert) {
          parentEl = rootEl; // actualization
          capture();

          this._hideClone();

          dragOverEvent("revert");

          if (!Sortable.eventCanceled) {
            if (nextEl) {
              rootEl.insertBefore(dragEl, nextEl);
            } else {
              rootEl.appendChild(dragEl);
            }
          }

          return completed(true);
        }

        let elLastChild = lastChild(el, options.draggable);

        if (
          !elLastChild ||
          (_ghostIsLast(evt, vertical, this) && !elLastChild.animated)
        ) {
          // If already at end of list: Do not insert
          if (elLastChild === dragEl) {
            return completed(false);
          }

          // assign target only if condition is true
          if (elLastChild && el === evt.target) {
            target = elLastChild;
          }

          if (target) {
            targetRect = getRect(target);
          }

          if (
            onMove(
              rootEl,
              el,
              dragEl,
              dragRect,
              target,
              targetRect,
              evt,
              !!target
            ) !== false
          ) {
            capture();
            el.appendChild(dragEl);
            parentEl = el; // actualization

            changed();
            return completed(true);
          }
        } else if (target.parentNode === el) {
          targetRect = getRect(target);
          let direction = 0,
            targetBeforeFirstSwap,
            differentLevel = dragEl.parentNode !== el,
            differentRowCol = !_dragElInRowColumn(
              (dragEl.animated && dragEl.toRect) || dragRect,
              (target.animated && target.toRect) || targetRect,
              vertical
            ),
            side1 = vertical ? "top" : "left",
            scrolledPastTop =
              isScrolledPast(target, "top", "top") ||
              isScrolledPast(dragEl, "top", "top"),
            scrollBefore = scrolledPastTop ? scrolledPastTop.scrollTop : void 0;

          if (lastTarget !== target) {
            targetBeforeFirstSwap = targetRect[side1];
            pastFirstInvertThresh = false;
            isCircumstantialInvert =
              (!differentRowCol && options.invertSwap) || differentLevel;
          }

          direction = _getSwapDirection(
            evt,
            target,
            targetRect,
            vertical,
            differentRowCol ? 1 : options.swapThreshold,
            options.invertedSwapThreshold == null
              ? options.swapThreshold
              : options.invertedSwapThreshold,
            isCircumstantialInvert,
            lastTarget === target
          );

          let sibling;

          if (direction !== 0) {
            // Check if target is beside dragEl in respective direction (ignoring hidden elements)
            let dragIndex = index(dragEl);

            do {
              dragIndex -= direction;
              sibling = parentEl.children[dragIndex];
            } while (
              sibling &&
              (css(sibling, "display") === "none" || sibling === ghostEl)
            );
          }
          // If dragEl is already beside target: Do not insert
          if (direction === 0 || sibling === target) {
            return completed(false);
          }

          lastTarget = target;

          lastDirection = direction;

          let nextSibling = target.nextElementSibling,
            after = false;

          after = direction === 1;

          let moveVector = onMove(
            rootEl,
            el,
            dragEl,
            dragRect,
            target,
            targetRect,
            evt,
            after
          );

          if (moveVector !== false) {
            if (moveVector === 1 || moveVector === -1) {
              after = moveVector === 1;
            }

            _silent = true;
            setTimeout(_unsilent, 30);

            capture();

            if (after && !nextSibling) {
              el.appendChild(dragEl);
            } else {
              target.parentNode.insertBefore(
                dragEl,
                after ? nextSibling : target
              );
            }

            // Undo chrome's scroll adjustment (has no effect on other browsers)
            if (scrolledPastTop) {
              scrollBy(
                scrolledPastTop,
                0,
                scrollBefore - scrolledPastTop.scrollTop
              );
            }

            parentEl = dragEl.parentNode; // actualization

            // must be done before animation
            if (
              targetBeforeFirstSwap !== undefined &&
              !isCircumstantialInvert
            ) {
              targetMoveDistance = Math.abs(
                targetBeforeFirstSwap - getRect(target)[side1]
              );
            }
            changed();

            return completed(true);
          }
        }

        if (el.contains(dragEl)) {
          return completed(false);
        }
      }

      return false;
    },

    _ignoreWhileAnimating: null,

    _offMoveEvents: function () {
      off(document, "mousemove", this._onTouchMove);
      off(document, "touchmove", this._onTouchMove);
      off(document, "pointermove", this._onTouchMove);
      off(document, "dragover", nearestEmptyInsertDetectEvent);
      off(document, "mousemove", nearestEmptyInsertDetectEvent);
      off(document, "touchmove", nearestEmptyInsertDetectEvent);
    },

    _offUpEvents: function () {
      let ownerDocument = this.el.ownerDocument;

      off(ownerDocument, "mouseup", this._onDrop);
      off(ownerDocument, "touchend", this._onDrop);
      off(ownerDocument, "pointerup", this._onDrop);
      off(ownerDocument, "touchcancel", this._onDrop);
      off(document, "selectstart", this);
    },

    _onDrop: function (/**Event*/ evt) {
      let el = this.el,
        options = this.options;

      // Get the index of the dragged element within its parent
      newIndex = index(dragEl);
      newDraggableIndex = index(dragEl, options.draggable);

      pluginEvent("drop", this, {
        evt,
      });

      parentEl = dragEl && dragEl.parentNode;

      // Get again after plugin event
      newIndex = index(dragEl);
      newDraggableIndex = index(dragEl, options.draggable);

      if (Sortable.eventCanceled) {
        this._nulling();
        return;
      }

      awaitingDragStarted = false;
      isCircumstantialInvert = false;
      pastFirstInvertThresh = false;

      clearInterval(this._loopId);

      clearTimeout(this._dragStartTimer);

      _cancelNextTick(this.cloneId);
      _cancelNextTick(this._dragStartId);

      // Unbind events
      if (this.nativeDraggable) {
        off(document, "drop", this);
        off(el, "dragstart", this._onDragStart);
      }
      this._offMoveEvents();
      this._offUpEvents();

      if (Safari) {
        css(document.body, "user-select", "");
      }

      css(dragEl, "transform", "");

      if (evt) {
        if (moved) {
          evt.cancelable && evt.preventDefault();
          !options.dropBubble && evt.stopPropagation();
        }

        ghostEl &&
          ghostEl.parentNode &&
          ghostEl.parentNode.removeChild(ghostEl);

        if (
          rootEl === parentEl ||
          (putSortable && putSortable.lastPutMode !== "clone")
        ) {
          // Remove clone(s)
          cloneEl &&
            cloneEl.parentNode &&
            cloneEl.parentNode.removeChild(cloneEl);
        }

        if (dragEl) {
          if (this.nativeDraggable) {
            off(dragEl, "dragend", this);
          }

          _disableDraggable(dragEl);
          dragEl.style["will-change"] = "";

          // Remove classes
          // ghostClass is added in dragStarted
          if (moved && !awaitingDragStarted) {
            toggleClass(
              dragEl,
              putSortable
                ? putSortable.options.ghostClass
                : this.options.ghostClass,
              false
            );
          }
          toggleClass(dragEl, this.options.chosenClass, false);

          // Drag stop event
          _dispatchEvent({
            sortable: this,
            name: "unchoose",
            toEl: parentEl,
            newIndex: null,
            newDraggableIndex: null,
            originalEvent: evt,
          });

          if (rootEl !== parentEl) {
            if (newIndex >= 0) {
              // Add event
              _dispatchEvent({
                rootEl: parentEl,
                name: "add",
                toEl: parentEl,
                fromEl: rootEl,
                originalEvent: evt,
              });

              // Remove event
              _dispatchEvent({
                sortable: this,
                name: "remove",
                toEl: parentEl,
                originalEvent: evt,
              });

              // drag from one list and drop into another
              _dispatchEvent({
                rootEl: parentEl,
                name: "sort",
                toEl: parentEl,
                fromEl: rootEl,
                originalEvent: evt,
              });

              _dispatchEvent({
                sortable: this,
                name: "sort",
                toEl: parentEl,
                originalEvent: evt,
              });
            }

            putSortable && putSortable.save();
          } else {
            if (newIndex !== oldIndex) {
              if (newIndex >= 0) {
                // drag & drop within the same list
                _dispatchEvent({
                  sortable: this,
                  name: "update",
                  toEl: parentEl,
                  originalEvent: evt,
                });

                _dispatchEvent({
                  sortable: this,
                  name: "sort",
                  toEl: parentEl,
                  originalEvent: evt,
                });
              }
            }
          }

          if (Sortable.active) {
            /* jshint eqnull:true */
            if (newIndex == null || newIndex === -1) {
              newIndex = oldIndex;
              newDraggableIndex = oldDraggableIndex;
            }

            _dispatchEvent({
              sortable: this,
              name: "end",
              toEl: parentEl,
              originalEvent: evt,
            });

            // Save sorting
            this.save();
          }
        }
      }
      this._nulling();
    },

    _nulling: function () {
      pluginEvent("nulling", this);

      rootEl = dragEl = parentEl = ghostEl = nextEl = cloneEl = lastDownEl = cloneHidden = tapEvt = touchEvt = moved = newIndex = newDraggableIndex = oldIndex = oldDraggableIndex = lastTarget = lastDirection = putSortable = activeGroup = Sortable.dragged = Sortable.ghost = Sortable.clone = Sortable.active = null;

      savedInputChecked.forEach(function (el) {
        el.checked = true;
      });

      savedInputChecked.length = lastDx = lastDy = 0;
    },

    handleEvent: function (/**Event*/ evt) {
      switch (evt.type) {
        case "drop":
        case "dragend":
          this._onDrop(evt);
          break;

        case "dragenter":
        case "dragover":
          if (dragEl) {
            this._onDragOver(evt);
            _globalDragOver(evt);
          }
          break;

        case "selectstart":
          evt.preventDefault();
          break;
      }
    },

    /**
     * Serializes the item into an array of string.
     * @returns {String[]}
     */
    toArray: function () {
      let order = [],
        el,
        children = this.el.children,
        i = 0,
        n = children.length,
        options = this.options;

      for (; i < n; i++) {
        el = children[i];
        if (closest(el, options.draggable, this.el, false)) {
          order.push(el.getAttribute(options.dataIdAttr) || _generateId(el));
        }
      }

      return order;
    },

    /**
     * Sorts the elements according to the array.
     * @param  {String[]}  order  order of the items
     */
    sort: function (order) {
      let items = {},
        rootEl = this.el;

      this.toArray().forEach(function (id, i) {
        let el = rootEl.children[i];

        if (closest(el, this.options.draggable, rootEl, false)) {
          items[id] = el;
        }
      }, this);

      order.forEach(function (id) {
        if (items[id]) {
          rootEl.removeChild(items[id]);
          rootEl.appendChild(items[id]);
        }
      });
    },

    /**
     * Save the current sorting
     */
    save: function () {
      let store = this.options.store;
      store && store.set && store.set(this);
    },

    /**
     * For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
     * @param   {HTMLElement}  el
     * @param   {String}       [selector]  default: `options.draggable`
     * @returns {HTMLElement|null}
     */
    closest: function (el, selector) {
      return closest(el, selector || this.options.draggable, this.el, false);
    },

    /**
     * Set/get option
     * @param   {string} name
     * @param   {*}      [value]
     * @returns {*}
     */
    option: function (name, value) {
      let options = this.options;

      if (value === void 0) {
        return options[name];
      } else {
        let modifiedValue = PluginManager.modifyOption(this, name, value);
        if (typeof modifiedValue !== "undefined") {
          options[name] = modifiedValue;
        } else {
          options[name] = value;
        }

        if (name === "group") {
          _prepareGroup(options);
        }
      }
    },

    /**
     * Destroy
     */
    destroy: function () {
      pluginEvent("destroy", this);
      let el = this.el;

      el[expando] = null;

      off(el, "mousedown", this._onTapStart);
      off(el, "touchstart", this._onTapStart);
      off(el, "pointerdown", this._onTapStart);

      if (this.nativeDraggable) {
        off(el, "dragover", this);
        off(el, "dragenter", this);
      }
      // Remove draggable attributes
      Array.prototype.forEach.call(
        el.querySelectorAll("[draggable]"),
        function (el) {
          el.removeAttribute("draggable");
        }
      );

      this._onDrop();

      this._disableDelayedDragEvents();

      sortables.splice(sortables.indexOf(this.el), 1);

      this.el = el = null;
    },

    _hideClone: function () {
      if (!cloneHidden) {
        pluginEvent("hideClone", this);
        if (Sortable.eventCanceled) return;

        css(cloneEl, "display", "none");
        if (this.options.removeCloneOnHide && cloneEl.parentNode) {
          cloneEl.parentNode.removeChild(cloneEl);
        }
        cloneHidden = true;
      }
    },

    _showClone: function (putSortable) {
      if (putSortable.lastPutMode !== "clone") {
        this._hideClone();
        return;
      }

      if (cloneHidden) {
        pluginEvent("showClone", this);
        if (Sortable.eventCanceled) return;

        // show clone at dragEl or original position
        if (dragEl.parentNode == rootEl && !this.options.group.revertClone) {
          rootEl.insertBefore(cloneEl, dragEl);
        } else if (nextEl) {
          rootEl.insertBefore(cloneEl, nextEl);
        } else {
          rootEl.appendChild(cloneEl);
        }

        if (this.options.group.revertClone) {
          this.animate(dragEl, cloneEl);
        }

        css(cloneEl, "display", "");
        cloneHidden = false;
      }
    },
  };

  function _globalDragOver(/**Event*/ evt) {
    if (evt.dataTransfer) {
      evt.dataTransfer.dropEffect = "move";
    }
    evt.cancelable && evt.preventDefault();
  }

  function onMove(
    fromEl,
    toEl,
    dragEl,
    dragRect,
    targetEl,
    targetRect,
    originalEvent,
    willInsertAfter
  ) {
    let evt,
      sortable = fromEl[expando],
      onMoveFn = sortable.options.onMove,
      retVal;
    // Support for new CustomEvent feature
    if (window.CustomEvent && !IE11OrLess && !Edge) {
      evt = new CustomEvent("move", {
        bubbles: true,
        cancelable: true,
      });
    } else {
      evt = document.createEvent("Event");
      evt.initEvent("move", true, true);
    }

    evt.to = toEl;
    evt.from = fromEl;
    evt.dragged = dragEl;
    evt.draggedRect = dragRect;
    evt.related = targetEl || toEl;
    evt.relatedRect = targetRect || getRect(toEl);
    evt.willInsertAfter = willInsertAfter;

    evt.originalEvent = originalEvent;

    fromEl.dispatchEvent(evt);

    if (onMoveFn) {
      retVal = onMoveFn.call(sortable, evt, originalEvent);
    }

    return retVal;
  }

  function _disableDraggable(el) {
    el.draggable = false;
  }

  function _unsilent() {
    _silent = false;
  }

  function _ghostIsLast(evt, vertical, sortable) {
    let rect = getRect(lastChild(sortable.el, sortable.options.draggable));
    const spacer = 10;

    return vertical
      ? evt.clientX > rect.right + spacer ||
          (evt.clientX <= rect.right &&
            evt.clientY > rect.bottom &&
            evt.clientX >= rect.left)
      : (evt.clientX > rect.right && evt.clientY > rect.top) ||
          (evt.clientX <= rect.right && evt.clientY > rect.bottom + spacer);
  }

  function _getSwapDirection(
    evt,
    target,
    targetRect,
    vertical,
    swapThreshold,
    invertedSwapThreshold,
    invertSwap,
    isLastTarget
  ) {
    let mouseOnAxis = vertical ? evt.clientY : evt.clientX,
      targetLength = vertical ? targetRect.height : targetRect.width,
      targetS1 = vertical ? targetRect.top : targetRect.left,
      targetS2 = vertical ? targetRect.bottom : targetRect.right,
      invert = false;

    if (!invertSwap) {
      // Never invert or create dragEl shadow when target movemenet causes mouse to move past the end of regular swapThreshold
      if (isLastTarget && targetMoveDistance < targetLength * swapThreshold) {
        // multiplied only by swapThreshold because mouse will already be inside target by (1 - threshold) * targetLength / 2
        // check if past first invert threshold on side opposite of lastDirection
        if (
          !pastFirstInvertThresh &&
          (lastDirection === 1
            ? mouseOnAxis >
              targetS1 + (targetLength * invertedSwapThreshold) / 2
            : mouseOnAxis <
              targetS2 - (targetLength * invertedSwapThreshold) / 2)
        ) {
          // past first invert threshold, do not restrict inverted threshold to dragEl shadow
          pastFirstInvertThresh = true;
        }

        if (!pastFirstInvertThresh) {
          // dragEl shadow (target move distance shadow)
          if (
            lastDirection === 1
              ? mouseOnAxis < targetS1 + targetMoveDistance // over dragEl shadow
              : mouseOnAxis > targetS2 - targetMoveDistance
          ) {
            return -lastDirection;
          }
        } else {
          invert = true;
        }
      } else {
        // Regular
        if (
          mouseOnAxis > targetS1 + (targetLength * (1 - swapThreshold)) / 2 &&
          mouseOnAxis < targetS2 - (targetLength * (1 - swapThreshold)) / 2
        ) {
          return _getInsertDirection(target);
        }
      }
    }

    invert = invert || invertSwap;

    if (invert) {
      // Invert of regular
      if (
        mouseOnAxis < targetS1 + (targetLength * invertedSwapThreshold) / 2 ||
        mouseOnAxis > targetS2 - (targetLength * invertedSwapThreshold) / 2
      ) {
        return mouseOnAxis > targetS1 + targetLength / 2 ? 1 : -1;
      }
    }

    return 0;
  }

  /**
   * Gets the direction dragEl must be swapped relative to target in order to make it
   * seem that dragEl has been "inserted" into that element's position
   * @param  {HTMLElement} target       The target whose position dragEl is being inserted at
   * @return {Number}                   Direction dragEl must be swapped
   */
  function _getInsertDirection(target) {
    if (index(dragEl) < index(target)) {
      return 1;
    } else {
      return -1;
    }
  }

  /**
   * Generate id
   * @param   {HTMLElement} el
   * @returns {String}
   * @private
   */
  function _generateId(el) {
    let str = el.tagName + el.className + el.src + el.href + el.textContent,
      i = str.length,
      sum = 0;

    while (i--) {
      sum += str.charCodeAt(i);
    }

    return sum.toString(36);
  }

  function _saveInputCheckedState(root) {
    savedInputChecked.length = 0;

    let inputs = root.getElementsByTagName("input");
    let idx = inputs.length;

    while (idx--) {
      let el = inputs[idx];
      el.checked && savedInputChecked.push(el);
    }
  }

  function _nextTick(fn) {
    return setTimeout(fn, 0);
  }

  function _cancelNextTick(id) {
    return clearTimeout(id);
  }

  // Fixed #973:
  if (documentExists) {
    on(document, "touchmove", function (evt) {
      if ((Sortable.active || awaitingDragStarted) && evt.cancelable) {
        evt.preventDefault();
      }
    });
  }

  // Export utils
  Sortable.utils = {
    on: on,
    off: off,
    css: css,
    find: find,
    is: function (el, selector) {
      return !!closest(el, selector, el, false);
    },
    extend: extend,
    throttle: throttle,
    closest: closest,
    toggleClass: toggleClass,
    clone: clone,
    index: index,
    nextTick: _nextTick,
    cancelNextTick: _cancelNextTick,
    detectDirection: _detectDirection,
    getChild: getChild,
  };

  /**
   * Get the Sortable instance of an element
   * @param  {HTMLElement} element The element
   * @return {Sortable|undefined}         The instance of Sortable
   */
  Sortable.get = function (element) {
    return element[expando];
  };

  /**
   * Mount a plugin to Sortable
   * @param  {...SortablePlugin|SortablePlugin[]} plugins       Plugins being mounted
   */
  Sortable.mount = function (...plugins) {
    if (plugins[0].constructor === Array) plugins = plugins[0];

    plugins.forEach((plugin) => {
      if (!plugin.prototype || !plugin.prototype.constructor) {
        throw `Sortable: Mounted plugin must be a constructor function, not ${{}.toString.call(
          plugin
        )}`;
      }
      if (plugin.utils) Sortable.utils = { ...Sortable.utils, ...plugin.utils };

      PluginManager.mount(plugin);
    });
  };

  /**
   * Create sortable instance
   * @param {HTMLElement}  el
   * @param {Object}      [options]
   */
  Sortable.create = function (el, options) {
    return new Sortable(el, options);
  };

  // Export
  Sortable.version = version;

  let autoScrolls = [],
    scrollEl,
    scrollRootEl,
    scrolling = false,
    lastAutoScrollX,
    lastAutoScrollY,
    touchEvt$1,
    pointerElemChangedInterval;

  function AutoScrollPlugin() {
    function AutoScroll() {
      this.defaults = {
        scroll: true,
        scrollSensitivity: 30,
        scrollSpeed: 10,
        bubbleScroll: true,
      };

      // Bind all private methods
      for (let fn in this) {
        if (fn.charAt(0) === "_" && typeof this[fn] === "function") {
          this[fn] = this[fn].bind(this);
        }
      }
    }

    AutoScroll.prototype = {
      dragStarted({ originalEvent }) {
        if (this.sortable.nativeDraggable) {
          on(document, "dragover", this._handleAutoScroll);
        } else {
          if (this.options.supportPointer) {
            on(document, "pointermove", this._handleFallbackAutoScroll);
          } else if (originalEvent.touches) {
            on(document, "touchmove", this._handleFallbackAutoScroll);
          } else {
            on(document, "mousemove", this._handleFallbackAutoScroll);
          }
        }
      },

      dragOverCompleted({ originalEvent }) {
        // For when bubbling is canceled and using fallback (fallback 'touchmove' always reached)
        if (!this.options.dragOverBubble && !originalEvent.rootEl) {
          this._handleAutoScroll(originalEvent);
        }
      },

      drop() {
        if (this.sortable.nativeDraggable) {
          off(document, "dragover", this._handleAutoScroll);
        } else {
          off(document, "pointermove", this._handleFallbackAutoScroll);
          off(document, "touchmove", this._handleFallbackAutoScroll);
          off(document, "mousemove", this._handleFallbackAutoScroll);
        }

        clearPointerElemChangedInterval();
        clearAutoScrolls();
        cancelThrottle();
      },

      nulling() {
        touchEvt$1 = scrollRootEl = scrollEl = scrolling = pointerElemChangedInterval = lastAutoScrollX = lastAutoScrollY = null;

        autoScrolls.length = 0;
      },

      _handleFallbackAutoScroll(evt) {
        this._handleAutoScroll(evt, true);
      },

      _handleAutoScroll(evt, fallback) {
        const x = (evt.touches ? evt.touches[0] : evt).clientX,
          y = (evt.touches ? evt.touches[0] : evt).clientY,
          elem = document.elementFromPoint(x, y);

        touchEvt$1 = evt;

        // IE does not seem to have native autoscroll,
        // Edge's autoscroll seems too conditional,
        // MACOS Safari does not have autoscroll,
        // Firefox and Chrome are good
        if (fallback || Edge || IE11OrLess || Safari) {
          autoScroll(evt, this.options, elem, fallback);

          // Listener for pointer element change
          let ogElemScroller = getParentAutoScrollElement(elem, true);
          if (
            scrolling &&
            (!pointerElemChangedInterval ||
              x !== lastAutoScrollX ||
              y !== lastAutoScrollY)
          ) {
            pointerElemChangedInterval && clearPointerElemChangedInterval();
            // Detect for pointer elem change, emulating native DnD behaviour
            pointerElemChangedInterval = setInterval(() => {
              let newElem = getParentAutoScrollElement(
                document.elementFromPoint(x, y),
                true
              );
              if (newElem !== ogElemScroller) {
                ogElemScroller = newElem;
                clearAutoScrolls();
              }
              autoScroll(evt, this.options, newElem, fallback);
            }, 10);
            lastAutoScrollX = x;
            lastAutoScrollY = y;
          }
        } else {
          // if DnD is enabled (and browser has good autoscrolling), first autoscroll will already scroll, so get parent autoscroll of first autoscroll
          if (
            !this.options.bubbleScroll ||
            getParentAutoScrollElement(elem, true) ===
              getWindowScrollingElement()
          ) {
            clearAutoScrolls();
            return;
          }
          autoScroll(
            evt,
            this.options,
            getParentAutoScrollElement(elem, false),
            false
          );
        }
      },
    };

    return Object.assign(AutoScroll, {
      pluginName: "scroll",
      initializeByDefault: true,
    });
  }

  function clearAutoScrolls() {
    autoScrolls.forEach(function (autoScroll) {
      clearInterval(autoScroll.pid);
    });
    autoScrolls = [];
  }

  function clearPointerElemChangedInterval() {
    clearInterval(pointerElemChangedInterval);
  }

  const autoScroll = throttle(function (evt, options, rootEl, isFallback) {
    // Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=505521
    if (!options.scroll) return;
    const x = (evt.touches ? evt.touches[0] : evt).clientX,
      y = (evt.touches ? evt.touches[0] : evt).clientY,
      sens = options.scrollSensitivity,
      speed = options.scrollSpeed,
      winScroller = getWindowScrollingElement();

    let scrollThisInstance = false,
      scrollCustomFn;

    // New scroll root, set scrollEl
    if (scrollRootEl !== rootEl) {
      scrollRootEl = rootEl;

      clearAutoScrolls();

      scrollEl = options.scroll;
      scrollCustomFn = options.scrollFn;

      if (scrollEl === true) {
        scrollEl = getParentAutoScrollElement(rootEl, true);
      }
    }

    let layersOut = 0;
    let currentParent = scrollEl;
    do {
      let el = currentParent,
        rect = getRect(el),
        top = rect.top,
        bottom = rect.bottom,
        left = rect.left,
        right = rect.right,
        width = rect.width,
        height = rect.height,
        canScrollX,
        canScrollY,
        scrollWidth = el.scrollWidth,
        scrollHeight = el.scrollHeight,
        elCSS = css(el),
        scrollPosX = el.scrollLeft,
        scrollPosY = el.scrollTop;

      if (el === winScroller) {
        canScrollX =
          width < scrollWidth &&
          (elCSS.overflowX === "auto" ||
            elCSS.overflowX === "scroll" ||
            elCSS.overflowX === "visible");
        canScrollY =
          height < scrollHeight &&
          (elCSS.overflowY === "auto" ||
            elCSS.overflowY === "scroll" ||
            elCSS.overflowY === "visible");
      } else {
        canScrollX =
          width < scrollWidth &&
          (elCSS.overflowX === "auto" || elCSS.overflowX === "scroll");
        canScrollY =
          height < scrollHeight &&
          (elCSS.overflowY === "auto" || elCSS.overflowY === "scroll");
      }

      let vx =
        canScrollX &&
        (Math.abs(right - x) <= sens && scrollPosX + width < scrollWidth) -
          (Math.abs(left - x) <= sens && !!scrollPosX);
      let vy =
        canScrollY &&
        (Math.abs(bottom - y) <= sens && scrollPosY + height < scrollHeight) -
          (Math.abs(top - y) <= sens && !!scrollPosY);

      if (!autoScrolls[layersOut]) {
        for (let i = 0; i <= layersOut; i++) {
          if (!autoScrolls[i]) {
            autoScrolls[i] = {};
          }
        }
      }

      if (
        autoScrolls[layersOut].vx != vx ||
        autoScrolls[layersOut].vy != vy ||
        autoScrolls[layersOut].el !== el
      ) {
        autoScrolls[layersOut].el = el;
        autoScrolls[layersOut].vx = vx;
        autoScrolls[layersOut].vy = vy;

        clearInterval(autoScrolls[layersOut].pid);

        if (vx != 0 || vy != 0) {
          scrollThisInstance = true;
          /* jshint loopfunc:true */
          autoScrolls[layersOut].pid = setInterval(
            function () {
              // emulate drag over during autoscroll (fallback), emulating native DnD behaviour
              if (isFallback && this.layer === 0) {
                Sortable.active._onTouchMove(touchEvt$1); // To move ghost if it is positioned absolutely
              }
              let scrollOffsetY = autoScrolls[this.layer].vy
                ? autoScrolls[this.layer].vy * speed
                : 0;
              let scrollOffsetX = autoScrolls[this.layer].vx
                ? autoScrolls[this.layer].vx * speed
                : 0;

              if (typeof scrollCustomFn === "function") {
                if (
                  scrollCustomFn.call(
                    Sortable.dragged.parentNode[expando],
                    scrollOffsetX,
                    scrollOffsetY,
                    evt,
                    touchEvt$1,
                    autoScrolls[this.layer].el
                  ) !== "continue"
                ) {
                  return;
                }
              }

              scrollBy(
                autoScrolls[this.layer].el,
                scrollOffsetX,
                scrollOffsetY
              );
            }.bind({ layer: layersOut }),
            24
          );
        }
      }
      layersOut++;
    } while (options.bubbleScroll && currentParent !== winScroller && (currentParent = getParentAutoScrollElement(currentParent, false)));
    scrolling = scrollThisInstance; // in case another function catches scrolling as false in between when it is not
  }, 30);

  const drop = function ({
    originalEvent,
    putSortable,
    dragEl,
    activeSortable,
    dispatchSortableEvent,
    hideGhostForTarget,
    unhideGhostForTarget,
  }) {
    if (!originalEvent) return;
    let toSortable = putSortable || activeSortable;
    hideGhostForTarget();
    let touch =
      originalEvent.changedTouches && originalEvent.changedTouches.length
        ? originalEvent.changedTouches[0]
        : originalEvent;
    let target = document.elementFromPoint(touch.clientX, touch.clientY);
    unhideGhostForTarget();
    if (toSortable && !toSortable.el.contains(target)) {
      dispatchSortableEvent("spill");
      this.onSpill({ dragEl, putSortable });
    }
  };

  function Revert() {}

  Revert.prototype = {
    startIndex: null,
    dragStart({ oldDraggableIndex }) {
      this.startIndex = oldDraggableIndex;
    },
    onSpill({ dragEl, putSortable }) {
      this.sortable.captureAnimationState();
      if (putSortable) {
        putSortable.captureAnimationState();
      }
      let nextSibling = getChild(
        this.sortable.el,
        this.startIndex,
        this.options
      );

      if (nextSibling) {
        this.sortable.el.insertBefore(dragEl, nextSibling);
      } else {
        this.sortable.el.appendChild(dragEl);
      }
      this.sortable.animateAll();
      if (putSortable) {
        putSortable.animateAll();
      }
    },
    drop,
  };

  Object.assign(Revert, {
    pluginName: "revertOnSpill",
  });

  function Remove() {}

  Remove.prototype = {
    onSpill({ dragEl, putSortable }) {
      const parentSortable = putSortable || this.sortable;
      parentSortable.captureAnimationState();
      dragEl.parentNode && dragEl.parentNode.removeChild(dragEl);
      parentSortable.animateAll();
    },
    drop,
  };

  Object.assign(Remove, {
    pluginName: "removeOnSpill",
  });

  let lastSwapEl;

  function SwapPlugin() {
    function Swap() {
      this.defaults = {
        swapClass: "sortable-swap-highlight",
      };
    }

    Swap.prototype = {
      dragStart({ dragEl }) {
        lastSwapEl = dragEl;
      },
      dragOverValid({
        completed,
        target,
        onMove,
        activeSortable,
        changed,
        cancel,
      }) {
        if (!activeSortable.options.swap) return;
        let el = this.sortable.el,
          options = this.options;
        if (target && target !== el) {
          let prevSwapEl = lastSwapEl;
          if (onMove(target) !== false) {
            toggleClass(target, options.swapClass, true);
            lastSwapEl = target;
          } else {
            lastSwapEl = null;
          }

          if (prevSwapEl && prevSwapEl !== lastSwapEl) {
            toggleClass(prevSwapEl, options.swapClass, false);
          }
        }
        changed();

        completed(true);
        cancel();
      },
      drop({ activeSortable, putSortable, dragEl }) {
        let toSortable = putSortable || this.sortable;
        let options = this.options;
        lastSwapEl && toggleClass(lastSwapEl, options.swapClass, false);
        if (
          lastSwapEl &&
          (options.swap || (putSortable && putSortable.options.swap))
        ) {
          if (dragEl !== lastSwapEl) {
            toSortable.captureAnimationState();
            if (toSortable !== activeSortable)
              activeSortable.captureAnimationState();
            swapNodes(dragEl, lastSwapEl);

            toSortable.animateAll();
            if (toSortable !== activeSortable) activeSortable.animateAll();
          }
        }
      },
      nulling() {
        lastSwapEl = null;
      },
    };

    return Object.assign(Swap, {
      pluginName: "swap",
      eventProperties() {
        return {
          swapItem: lastSwapEl,
        };
      },
    });
  }

  function swapNodes(n1, n2) {
    let p1 = n1.parentNode,
      p2 = n2.parentNode,
      i1,
      i2;

    if (!p1 || !p2 || p1.isEqualNode(n2) || p2.isEqualNode(n1)) return;

    i1 = index(n1);
    i2 = index(n2);

    if (p1.isEqualNode(p2) && i1 < i2) {
      i2++;
    }
    p1.insertBefore(n2, p1.children[i1]);
    p2.insertBefore(n1, p2.children[i2]);
  }

  let multiDragElements = [],
    multiDragClones = [],
    lastMultiDragSelect, // for selection with modifier key down (SHIFT)
    multiDragSortable,
    initialFolding = false, // Initial multi-drag fold when drag started
    folding = false, // Folding any other time
    dragStarted = false,
    dragEl$1,
    clonesFromRect,
    clonesHidden;

  function MultiDragPlugin() {
    function MultiDrag(sortable) {
      // Bind all private methods
      for (let fn in this) {
        if (fn.charAt(0) === "_" && typeof this[fn] === "function") {
          this[fn] = this[fn].bind(this);
        }
      }

      if (sortable.options.supportPointer) {
        on(document, "pointerup", this._deselectMultiDrag);
      } else {
        on(document, "mouseup", this._deselectMultiDrag);
        on(document, "touchend", this._deselectMultiDrag);
      }

      on(document, "keydown", this._checkKeyDown);
      on(document, "keyup", this._checkKeyUp);

      this.defaults = {
        selectedClass: "sortable-selected",
        multiDragKey: null,
        setData(dataTransfer, dragEl) {
          let data = "";
          if (multiDragElements.length && multiDragSortable === sortable) {
            multiDragElements.forEach((multiDragElement, i) => {
              data += (!i ? "" : ", ") + multiDragElement.textContent;
            });
          } else {
            data = dragEl.textContent;
          }
          dataTransfer.setData("Text", data);
        },
      };
    }

    MultiDrag.prototype = {
      multiDragKeyDown: false,
      isMultiDrag: false,

      delayStartGlobal({ dragEl: dragged }) {
        dragEl$1 = dragged;
      },

      delayEnded() {
        this.isMultiDrag = ~multiDragElements.indexOf(dragEl$1);
      },

      setupClone({ sortable, cancel }) {
        if (!this.isMultiDrag) return;
        for (let i = 0; i < multiDragElements.length; i++) {
          multiDragClones.push(clone(multiDragElements[i]));

          multiDragClones[i].sortableIndex = multiDragElements[i].sortableIndex;

          multiDragClones[i].draggable = false;
          multiDragClones[i].style["will-change"] = "";

          toggleClass(multiDragClones[i], this.options.selectedClass, false);
          multiDragElements[i] === dragEl$1 &&
            toggleClass(multiDragClones[i], this.options.chosenClass, false);
        }

        sortable._hideClone();
        cancel();
      },

      clone({ sortable, rootEl, dispatchSortableEvent, cancel }) {
        if (!this.isMultiDrag) return;
        if (!this.options.removeCloneOnHide) {
          if (multiDragElements.length && multiDragSortable === sortable) {
            insertMultiDragClones(true, rootEl);
            dispatchSortableEvent("clone");

            cancel();
          }
        }
      },

      showClone({ cloneNowShown, rootEl, cancel }) {
        if (!this.isMultiDrag) return;
        insertMultiDragClones(false, rootEl);
        multiDragClones.forEach((clone) => {
          css(clone, "display", "");
        });

        cloneNowShown();
        clonesHidden = false;
        cancel();
      },

      hideClone({ sortable, cloneNowHidden, cancel }) {
        if (!this.isMultiDrag) return;
        multiDragClones.forEach((clone) => {
          css(clone, "display", "none");
          if (this.options.removeCloneOnHide && clone.parentNode) {
            clone.parentNode.removeChild(clone);
          }
        });

        cloneNowHidden();
        clonesHidden = true;
        cancel();
      },

      dragStartGlobal({ sortable }) {
        if (!this.isMultiDrag && multiDragSortable) {
          multiDragSortable.multiDrag._deselectMultiDrag();
        }

        multiDragElements.forEach((multiDragElement) => {
          multiDragElement.sortableIndex = index(multiDragElement);
        });

        // Sort multi-drag elements
        multiDragElements = multiDragElements.sort(function (a, b) {
          return a.sortableIndex - b.sortableIndex;
        });
        dragStarted = true;
      },

      dragStarted({ sortable }) {
        if (!this.isMultiDrag) return;
        if (this.options.sort) {
          // Capture rects,
          // hide multi drag elements (by positioning them absolute),
          // set multi drag elements rects to dragRect,
          // show multi drag elements,
          // animate to rects,
          // unset rects & remove from DOM

          sortable.captureAnimationState();

          if (this.options.animation) {
            multiDragElements.forEach((multiDragElement) => {
              if (multiDragElement === dragEl$1) return;
              css(multiDragElement, "position", "absolute");
            });

            let dragRect = getRect(dragEl$1, false, true, true);

            multiDragElements.forEach((multiDragElement) => {
              if (multiDragElement === dragEl$1) return;
              setRect(multiDragElement, dragRect);
            });

            folding = true;
            initialFolding = true;
          }
        }

        sortable.animateAll(() => {
          folding = false;
          initialFolding = false;

          if (this.options.animation) {
            multiDragElements.forEach((multiDragElement) => {
              unsetRect(multiDragElement);
            });
          }

          // Remove all auxiliary multidrag items from el, if sorting enabled
          if (this.options.sort) {
            removeMultiDragElements();
          }
        });
      },

      dragOver({ target, completed, cancel }) {
        if (folding && ~multiDragElements.indexOf(target)) {
          completed(false);
          cancel();
        }
      },

      revert({ fromSortable, rootEl, sortable, dragRect }) {
        if (multiDragElements.length > 1) {
          // Setup unfold animation
          multiDragElements.forEach((multiDragElement) => {
            sortable.addAnimationState({
              target: multiDragElement,
              rect: folding ? getRect(multiDragElement) : dragRect,
            });

            unsetRect(multiDragElement);

            multiDragElement.fromRect = dragRect;

            fromSortable.removeAnimationState(multiDragElement);
          });
          folding = false;
          insertMultiDragElements(!this.options.removeCloneOnHide, rootEl);
        }
      },

      dragOverCompleted({
        sortable,
        isOwner,
        insertion,
        activeSortable,
        parentEl,
        putSortable,
      }) {
        let options = this.options;
        if (insertion) {
          // Clones must be hidden before folding animation to capture dragRectAbsolute properly
          if (isOwner) {
            activeSortable._hideClone();
          }

          initialFolding = false;
          // If leaving sort:false root, or already folding - Fold to new location
          if (
            options.animation &&
            multiDragElements.length > 1 &&
            (folding ||
              (!isOwner && !activeSortable.options.sort && !putSortable))
          ) {
            // Fold: Set all multi drag elements's rects to dragEl's rect when multi-drag elements are invisible
            let dragRectAbsolute = getRect(dragEl$1, false, true, true);

            multiDragElements.forEach((multiDragElement) => {
              if (multiDragElement === dragEl$1) return;
              setRect(multiDragElement, dragRectAbsolute);

              // Move element(s) to end of parentEl so that it does not interfere with multi-drag clones insertion if they are inserted
              // while folding, and so that we can capture them again because old sortable will no longer be fromSortable
              parentEl.appendChild(multiDragElement);
            });

            folding = true;
          }

          // Clones must be shown (and check to remove multi drags) after folding when interfering multiDragElements are moved out
          if (!isOwner) {
            // Only remove if not folding (folding will remove them anyways)
            if (!folding) {
              removeMultiDragElements();
            }

            if (multiDragElements.length > 1) {
              let clonesHiddenBefore = clonesHidden;
              activeSortable._showClone(sortable);

              // Unfold animation for clones if showing from hidden
              if (
                activeSortable.options.animation &&
                !clonesHidden &&
                clonesHiddenBefore
              ) {
                multiDragClones.forEach((clone) => {
                  activeSortable.addAnimationState({
                    target: clone,
                    rect: clonesFromRect,
                  });

                  clone.fromRect = clonesFromRect;
                  clone.thisAnimationDuration = null;
                });
              }
            } else {
              activeSortable._showClone(sortable);
            }
          }
        }
      },

      dragOverAnimationCapture({ dragRect, isOwner, activeSortable }) {
        multiDragElements.forEach((multiDragElement) => {
          multiDragElement.thisAnimationDuration = null;
        });

        if (
          activeSortable.options.animation &&
          !isOwner &&
          activeSortable.multiDrag.isMultiDrag
        ) {
          clonesFromRect = Object.assign({}, dragRect);
          let dragMatrix = matrix(dragEl$1, true);
          clonesFromRect.top -= dragMatrix.f;
          clonesFromRect.left -= dragMatrix.e;
        }
      },

      dragOverAnimationComplete() {
        if (folding) {
          folding = false;
          removeMultiDragElements();
        }
      },

      drop({
        originalEvent: evt,
        rootEl,
        parentEl,
        sortable,
        dispatchSortableEvent,
        oldIndex,
        putSortable,
      }) {
        let toSortable = putSortable || this.sortable;

        if (!evt) return;

        let options = this.options,
          children = parentEl.children;

        // Multi-drag selection
        if (!dragStarted) {
          if (options.multiDragKey && !this.multiDragKeyDown) {
            this._deselectMultiDrag();
          }
          toggleClass(
            dragEl$1,
            options.selectedClass,
            !~multiDragElements.indexOf(dragEl$1)
          );

          if (!~multiDragElements.indexOf(dragEl$1)) {
            multiDragElements.push(dragEl$1);
            dispatchEvent({
              sortable,
              rootEl,
              name: "select",
              targetEl: dragEl$1,
              originalEvt: evt,
            });

            // Modifier activated, select from last to dragEl
            if (
              evt.shiftKey &&
              lastMultiDragSelect &&
              sortable.el.contains(lastMultiDragSelect)
            ) {
              let lastIndex = index(lastMultiDragSelect),
                currentIndex = index(dragEl$1);

              if (~lastIndex && ~currentIndex && lastIndex !== currentIndex) {
                // Must include lastMultiDragSelect (select it), in case modified selection from no selection
                // (but previous selection existed)
                let n, i;
                if (currentIndex > lastIndex) {
                  i = lastIndex;
                  n = currentIndex;
                } else {
                  i = currentIndex;
                  n = lastIndex + 1;
                }

                for (; i < n; i++) {
                  if (~multiDragElements.indexOf(children[i])) continue;
                  toggleClass(children[i], options.selectedClass, true);
                  multiDragElements.push(children[i]);

                  dispatchEvent({
                    sortable,
                    rootEl,
                    name: "select",
                    targetEl: children[i],
                    originalEvt: evt,
                  });
                }
              }
            } else {
              lastMultiDragSelect = dragEl$1;
            }

            multiDragSortable = toSortable;
          } else {
            multiDragElements.splice(multiDragElements.indexOf(dragEl$1), 1);
            lastMultiDragSelect = null;
            dispatchEvent({
              sortable,
              rootEl,
              name: "deselect",
              targetEl: dragEl$1,
              originalEvt: evt,
            });
          }
        }

        // Multi-drag drop
        if (dragStarted && this.isMultiDrag) {
          // Do not "unfold" after around dragEl if reverted
          if (
            (parentEl[expando].options.sort || parentEl !== rootEl) &&
            multiDragElements.length > 1
          ) {
            let dragRect = getRect(dragEl$1),
              multiDragIndex = index(
                dragEl$1,
                ":not(." + this.options.selectedClass + ")"
              );

            if (!initialFolding && options.animation)
              dragEl$1.thisAnimationDuration = null;

            toSortable.captureAnimationState();

            if (!initialFolding) {
              if (options.animation) {
                dragEl$1.fromRect = dragRect;
                multiDragElements.forEach((multiDragElement) => {
                  multiDragElement.thisAnimationDuration = null;
                  if (multiDragElement !== dragEl$1) {
                    let rect = folding ? getRect(multiDragElement) : dragRect;
                    multiDragElement.fromRect = rect;

                    // Prepare unfold animation
                    toSortable.addAnimationState({
                      target: multiDragElement,
                      rect: rect,
                    });
                  }
                });
              }

              // Multi drag elements are not necessarily removed from the DOM on drop, so to reinsert
              // properly they must all be removed
              removeMultiDragElements();

              multiDragElements.forEach((multiDragElement) => {
                if (children[multiDragIndex]) {
                  parentEl.insertBefore(
                    multiDragElement,
                    children[multiDragIndex]
                  );
                } else {
                  parentEl.appendChild(multiDragElement);
                }
                multiDragIndex++;
              });

              // If initial folding is done, the elements may have changed position because they are now
              // unfolding around dragEl, even though dragEl may not have his index changed, so update event
              // must be fired here as Sortable will not.
              if (oldIndex === index(dragEl$1)) {
                let update = false;
                multiDragElements.forEach((multiDragElement) => {
                  if (
                    multiDragElement.sortableIndex !== index(multiDragElement)
                  ) {
                    update = true;
                    return;
                  }
                });

                if (update) {
                  dispatchSortableEvent("update");
                }
              }
            }

            // Must be done after capturing individual rects (scroll bar)
            multiDragElements.forEach((multiDragElement) => {
              unsetRect(multiDragElement);
            });

            toSortable.animateAll();
          }

          multiDragSortable = toSortable;
        }

        // Remove clones if necessary
        if (
          rootEl === parentEl ||
          (putSortable && putSortable.lastPutMode !== "clone")
        ) {
          multiDragClones.forEach((clone) => {
            clone.parentNode && clone.parentNode.removeChild(clone);
          });
        }
      },

      nullingGlobal() {
        this.isMultiDrag = dragStarted = false;
        multiDragClones.length = 0;
      },

      destroyGlobal() {
        this._deselectMultiDrag();
        off(document, "pointerup", this._deselectMultiDrag);
        off(document, "mouseup", this._deselectMultiDrag);
        off(document, "touchend", this._deselectMultiDrag);

        off(document, "keydown", this._checkKeyDown);
        off(document, "keyup", this._checkKeyUp);
      },

      _deselectMultiDrag(evt) {
        if (typeof dragStarted !== "undefined" && dragStarted) return;

        // Only deselect if selection is in this sortable
        if (multiDragSortable !== this.sortable) return;

        // Only deselect if target is not item in this sortable
        if (
          evt &&
          closest(evt.target, this.options.draggable, this.sortable.el, false)
        )
          return;

        // Only deselect if left click
        if (evt && evt.button !== 0) return;

        while (multiDragElements.length) {
          let el = multiDragElements[0];
          toggleClass(el, this.options.selectedClass, false);
          multiDragElements.shift();
          dispatchEvent({
            sortable: this.sortable,
            rootEl: this.sortable.el,
            name: "deselect",
            targetEl: el,
            originalEvt: evt,
          });
        }
      },

      _checkKeyDown(evt) {
        if (evt.key === this.options.multiDragKey) {
          this.multiDragKeyDown = true;
        }
      },

      _checkKeyUp(evt) {
        if (evt.key === this.options.multiDragKey) {
          this.multiDragKeyDown = false;
        }
      },
    };

    return Object.assign(MultiDrag, {
      // Static methods & properties
      pluginName: "multiDrag",
      utils: {
        /**
         * Selects the provided multi-drag item
         * @param  {HTMLElement} el    The element to be selected
         */
        select(el) {
          let sortable = el.parentNode[expando];
          if (
            !sortable ||
            !sortable.options.multiDrag ||
            ~multiDragElements.indexOf(el)
          )
            return;
          if (multiDragSortable && multiDragSortable !== sortable) {
            multiDragSortable.multiDrag._deselectMultiDrag();
            multiDragSortable = sortable;
          }
          toggleClass(el, sortable.options.selectedClass, true);
          multiDragElements.push(el);
        },
        /**
         * Deselects the provided multi-drag item
         * @param  {HTMLElement} el    The element to be deselected
         */
        deselect(el) {
          let sortable = el.parentNode[expando],
            index = multiDragElements.indexOf(el);
          if (!sortable || !sortable.options.multiDrag || !~index) return;
          toggleClass(el, sortable.options.selectedClass, false);
          multiDragElements.splice(index, 1);
        },
      },
      eventProperties() {
        const oldIndicies = [],
          newIndicies = [];

        multiDragElements.forEach((multiDragElement) => {
          oldIndicies.push({
            multiDragElement,
            index: multiDragElement.sortableIndex,
          });

          // multiDragElements will already be sorted if folding
          let newIndex;
          if (folding && multiDragElement !== dragEl$1) {
            newIndex = -1;
          } else if (folding) {
            newIndex = index(
              multiDragElement,
              ":not(." + this.options.selectedClass + ")"
            );
          } else {
            newIndex = index(multiDragElement);
          }
          newIndicies.push({
            multiDragElement,
            index: newIndex,
          });
        });
        return {
          items: [...multiDragElements],
          clones: [...multiDragClones],
          oldIndicies,
          newIndicies,
        };
      },
      optionListeners: {
        multiDragKey(key) {
          key = key.toLowerCase();
          if (key === "ctrl") {
            key = "Control";
          } else if (key.length > 1) {
            key = key.charAt(0).toUpperCase() + key.substr(1);
          }
          return key;
        },
      },
    });
  }

  function insertMultiDragElements(clonesInserted, rootEl) {
    multiDragElements.forEach((multiDragElement, i) => {
      let target =
        rootEl.children[
          multiDragElement.sortableIndex + (clonesInserted ? Number(i) : 0)
        ];
      if (target) {
        rootEl.insertBefore(multiDragElement, target);
      } else {
        rootEl.appendChild(multiDragElement);
      }
    });
  }

  /**
   * Insert multi-drag clones
   * @param  {[Boolean]} elementsInserted  Whether the multi-drag elements are inserted
   * @param  {HTMLElement} rootEl
   */
  function insertMultiDragClones(elementsInserted, rootEl) {
    multiDragClones.forEach((clone, i) => {
      let target =
        rootEl.children[
          clone.sortableIndex + (elementsInserted ? Number(i) : 0)
        ];
      if (target) {
        rootEl.insertBefore(clone, target);
      } else {
        rootEl.appendChild(clone);
      }
    });
  }

  function removeMultiDragElements() {
    multiDragElements.forEach((multiDragElement) => {
      if (multiDragElement === dragEl$1) return;
      multiDragElement.parentNode &&
        multiDragElement.parentNode.removeChild(multiDragElement);
    });
  }

  Sortable.mount(new AutoScrollPlugin());
  Sortable.mount(Remove, Revert);

  Sortable.mount(new SwapPlugin());
  Sortable.mount(new MultiDragPlugin());

  return Sortable;
});