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✏️ Editing: perfect-scrollbar.js

/*!
 * perfect-scrollbar v1.5.0
 * Copyright 2020 Hyunje Jun, MDBootstrap and Contributors
 * Licensed under MIT
 */

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = global || self, global.PerfectScrollbar = factory());
}(this, (function () { 'use strict';

function get(element) {
    return getComputedStyle(element);
  }

function div(className) {
    var div = document.createElement('div');
    div.className = className;
    return div;
  }

var elMatches =
    typeof Element !== 'undefined' &&
    (Element.prototype.matches ||
      Element.prototype.webkitMatchesSelector ||
      Element.prototype.mozMatchesSelector ||
      Element.prototype.msMatchesSelector);

function matches(element, query) {
    if (!elMatches) {
      throw new Error('No element matching method supported');
    }

return elMatches.call(element, query);
  }

function remove(element) {
    if (element.remove) {
      element.remove();
    } else {
      if (element.parentNode) {
        element.parentNode.removeChild(element);
      }
    }
  }

function queryChildren(element, selector) {
    return Array.prototype.filter.call(element.children, function (child) { return matches(child, selector); }
    );
  }

/*
   * Helper methods
   */
  var scrollingClassTimeout = { x: null, y: null };

function addScrollingClass(i, x) {
    var classList = i.element.classList;
    var className = cls.state.scrolling(x);

if (classList.contains(className)) {
      clearTimeout(scrollingClassTimeout[x]);
    } else {
      classList.add(className);
    }
  }

function removeScrollingClass(i, x) {
    scrollingClassTimeout[x] = setTimeout(
      function () { return i.isAlive && i.element.classList.remove(cls.state.scrolling(x)); },
      i.settings.scrollingThreshold
    );
  }

function setScrollingClassInstantly(i, x) {
    addScrollingClass(i, x);
    removeScrollingClass(i, x);
  }

var EventElement = function EventElement(element) {
    this.element = element;
    this.handlers = {};
  };

var prototypeAccessors = { isEmpty: { configurable: true } };

EventElement.prototype.bind = function bind (eventName, handler) {
    if (typeof this.handlers[eventName] === 'undefined') {
      this.handlers[eventName] = [];
    }
    this.handlers[eventName].push(handler);
    this.element.addEventListener(eventName, handler, false);
  };

EventElement.prototype.unbind = function unbind (eventName, target) {
      var this$1 = this;

this.handlers[eventName] = this.handlers[eventName].filter(function (handler) {
      if (target && handler !== target) {
        return true;
      }
      this$1.element.removeEventListener(eventName, handler, false);
      return false;
    });
  };

EventElement.prototype.unbindAll = function unbindAll () {
    for (var name in this.handlers) {
      this.unbind(name);
    }
  };

prototypeAccessors.isEmpty.get = function () {
      var this$1 = this;

return Object.keys(this.handlers).every(
      function (key) { return this$1.handlers[key].length === 0; }
    );
  };

Object.defineProperties( EventElement.prototype, prototypeAccessors );

var EventManager = function EventManager() {
    this.eventElements = [];
  };

EventManager.prototype.eventElement = function eventElement (element) {
    var ee = this.eventElements.filter(function (ee) { return ee.element === element; })[0];
    if (!ee) {
      ee = new EventElement(element);
      this.eventElements.push(ee);
    }
    return ee;
  };

EventManager.prototype.bind = function bind (element, eventName, handler) {
    this.eventElement(element).bind(eventName, handler);
  };

EventManager.prototype.unbind = function unbind (element, eventName, handler) {
    var ee = this.eventElement(element);
    ee.unbind(eventName, handler);

if (ee.isEmpty) {
      // remove
      this.eventElements.splice(this.eventElements.indexOf(ee), 1);
    }
  };

EventManager.prototype.unbindAll = function unbindAll () {
    this.eventElements.forEach(function (e) { return e.unbindAll(); });
    this.eventElements = [];
  };

EventManager.prototype.once = function once (element, eventName, handler) {
    var ee = this.eventElement(element);
    var onceHandler = function (evt) {
      ee.unbind(eventName, onceHandler);
      handler(evt);
    };
    ee.bind(eventName, onceHandler);
  };

function processScrollDiff(
    i,
    axis,
    diff,
    useScrollingClass,
    forceFireReachEvent
  ) {
    if ( useScrollingClass === void 0 ) useScrollingClass = true;
    if ( forceFireReachEvent === void 0 ) forceFireReachEvent = false;

var fields;
    if (axis === 'top') {
      fields = [
        'contentHeight',
        'containerHeight',
        'scrollTop',
        'y',
        'up',
        'down' ];
    } else if (axis === 'left') {
      fields = [
        'contentWidth',
        'containerWidth',
        'scrollLeft',
        'x',
        'left',
        'right' ];
    } else {
      throw new Error('A proper axis should be provided');
    }

processScrollDiff$1(i, diff, fields, useScrollingClass, forceFireReachEvent);
  }

function processScrollDiff$1(
    i,
    diff,
    ref,
    useScrollingClass,
    forceFireReachEvent
  ) {
    var contentHeight = ref[0];
    var containerHeight = ref[1];
    var scrollTop = ref[2];
    var y = ref[3];
    var up = ref[4];
    var down = ref[5];
    if ( useScrollingClass === void 0 ) useScrollingClass = true;
    if ( forceFireReachEvent === void 0 ) forceFireReachEvent = false;

var element = i.element;

// reset reach
    i.reach[y] = null;

// 1 for subpixel rounding
    if (element[scrollTop] < 1) {
      i.reach[y] = 'start';
    }

// 1 for subpixel rounding
    if (element[scrollTop] > i[contentHeight] - i[containerHeight] - 1) {
      i.reach[y] = 'end';
    }

if (diff) {
      element.dispatchEvent(createEvent(("ps-scroll-" + y)));

if (diff < 0) {
        element.dispatchEvent(createEvent(("ps-scroll-" + up)));
      } else if (diff > 0) {
        element.dispatchEvent(createEvent(("ps-scroll-" + down)));
      }

if (useScrollingClass) {
        setScrollingClassInstantly(i, y);
      }
    }

if (i.reach[y] && (diff || forceFireReachEvent)) {
      element.dispatchEvent(createEvent(("ps-" + y + "-reach-" + (i.reach[y]))));
    }
  }

function toInt(x) {
    return parseInt(x, 10) || 0;
  }

function isEditable(el) {
    return (
      matches(el, 'input,[contenteditable]') ||
      matches(el, 'select,[contenteditable]') ||
      matches(el, 'textarea,[contenteditable]') ||
      matches(el, 'button,[contenteditable]')
    );
  }

function outerWidth(element) {
    var styles = get(element);
    return (
      toInt(styles.width) +
      toInt(styles.paddingLeft) +
      toInt(styles.paddingRight) +
      toInt(styles.borderLeftWidth) +
      toInt(styles.borderRightWidth)
    );
  }

var env = {
    isWebKit:
      typeof document !== 'undefined' &&
      'WebkitAppearance' in document.documentElement.style,
    supportsTouch:
      typeof window !== 'undefined' &&
      ('ontouchstart' in window ||
        ('maxTouchPoints' in window.navigator &&
          window.navigator.maxTouchPoints > 0) ||
        (window.DocumentTouch && document instanceof window.DocumentTouch)),
    supportsIePointer:
      typeof navigator !== 'undefined' && navigator.msMaxTouchPoints,
    isChrome:
      typeof navigator !== 'undefined' &&
      /Chrome/i.test(navigator && navigator.userAgent),
  };

function updateGeometry(i) {
    var element = i.element;
    var roundedScrollTop = Math.floor(element.scrollTop);
    var rect = element.getBoundingClientRect();

i.containerWidth = Math.ceil(rect.width);
    i.containerHeight = Math.ceil(rect.height);
    i.contentWidth = element.scrollWidth;
    i.contentHeight = element.scrollHeight;

if (!element.contains(i.scrollbarXRail)) {
      // clean up and append
      queryChildren(element, cls.element.rail('x')).forEach(function (el) { return remove(el); }
      );
      element.appendChild(i.scrollbarXRail);
    }
    if (!element.contains(i.scrollbarYRail)) {
      // clean up and append
      queryChildren(element, cls.element.rail('y')).forEach(function (el) { return remove(el); }
      );
      element.appendChild(i.scrollbarYRail);
    }

if (
      !i.settings.suppressScrollX &&
      i.containerWidth + i.settings.scrollXMarginOffset < i.contentWidth
    ) {
      i.scrollbarXActive = true;
      i.railXWidth = i.containerWidth - i.railXMarginWidth;
      i.railXRatio = i.containerWidth / i.railXWidth;
      i.scrollbarXWidth = getThumbSize(
        i,
        toInt((i.railXWidth * i.containerWidth) / i.contentWidth)
      );
      i.scrollbarXLeft = toInt(
        ((i.negativeScrollAdjustment + element.scrollLeft) *
          (i.railXWidth - i.scrollbarXWidth)) /
          (i.contentWidth - i.containerWidth)
      );
    } else {
      i.scrollbarXActive = false;
    }

if (
      !i.settings.suppressScrollY &&
      i.containerHeight + i.settings.scrollYMarginOffset < i.contentHeight
    ) {
      i.scrollbarYActive = true;
      i.railYHeight = i.containerHeight - i.railYMarginHeight;
      i.railYRatio = i.containerHeight / i.railYHeight;
      i.scrollbarYHeight = getThumbSize(
        i,
        toInt((i.railYHeight * i.containerHeight) / i.contentHeight)
      );
      i.scrollbarYTop = toInt(
        (roundedScrollTop * (i.railYHeight - i.scrollbarYHeight)) /
          (i.contentHeight - i.containerHeight)
      );
    } else {
      i.scrollbarYActive = false;
    }

if (i.scrollbarXLeft >= i.railXWidth - i.scrollbarXWidth) {
      i.scrollbarXLeft = i.railXWidth - i.scrollbarXWidth;
    }
    if (i.scrollbarYTop >= i.railYHeight - i.scrollbarYHeight) {
      i.scrollbarYTop = i.railYHeight - i.scrollbarYHeight;
    }

updateCss(element, i);

if (i.scrollbarXActive) {
      element.classList.add(cls.state.active('x'));
    } else {
      element.classList.remove(cls.state.active('x'));
      i.scrollbarXWidth = 0;
      i.scrollbarXLeft = 0;
      element.scrollLeft = i.isRtl === true ? i.contentWidth : 0;
    }
    if (i.scrollbarYActive) {
      element.classList.add(cls.state.active('y'));
    } else {
      element.classList.remove(cls.state.active('y'));
      i.scrollbarYHeight = 0;
      i.scrollbarYTop = 0;
      element.scrollTop = 0;
    }
  }

function updateCss(element, i) {
    var xRailOffset = { width: i.railXWidth };
    var roundedScrollTop = Math.floor(element.scrollTop);

if (i.isRtl) {
      xRailOffset.left =
        i.negativeScrollAdjustment +
        element.scrollLeft +
        i.containerWidth -
        i.contentWidth;
    } else {
      xRailOffset.left = element.scrollLeft;
    }
    if (i.isScrollbarXUsingBottom) {
      xRailOffset.bottom = i.scrollbarXBottom - roundedScrollTop;
    } else {
      xRailOffset.top = i.scrollbarXTop + roundedScrollTop;
    }
    set(i.scrollbarXRail, xRailOffset);

set(i.scrollbarX, {
      left: i.scrollbarXLeft,
      width: i.scrollbarXWidth - i.railBorderXWidth,
    });
    set(i.scrollbarY, {
      top: i.scrollbarYTop,
      height: i.scrollbarYHeight - i.railBorderYWidth,
    });
  }

function clickRail(i) {
    var element = i.element;

i.event.bind(i.scrollbarY, 'mousedown', function (e) { return e.stopPropagation(); });
    i.event.bind(i.scrollbarYRail, 'mousedown', function (e) {
      var positionTop =
        e.pageY -
        window.pageYOffset -
        i.scrollbarYRail.getBoundingClientRect().top;
      var direction = positionTop > i.scrollbarYTop ? 1 : -1;

i.element.scrollTop += direction * i.containerHeight;
      updateGeometry(i);

e.stopPropagation();
    });

i.event.bind(i.scrollbarX, 'mousedown', function (e) { return e.stopPropagation(); });
    i.event.bind(i.scrollbarXRail, 'mousedown', function (e) {
      var positionLeft =
        e.pageX -
        window.pageXOffset -
        i.scrollbarXRail.getBoundingClientRect().left;
      var direction = positionLeft > i.scrollbarXLeft ? 1 : -1;

i.element.scrollLeft += direction * i.containerWidth;
      updateGeometry(i);

e.stopPropagation();
    });
  }

function dragThumb(i) {
    bindMouseScrollHandler(i, [
      'containerWidth',
      'contentWidth',
      'pageX',
      'railXWidth',
      'scrollbarX',
      'scrollbarXWidth',
      'scrollLeft',
      'x',
      'scrollbarXRail' ]);
    bindMouseScrollHandler(i, [
      'containerHeight',
      'contentHeight',
      'pageY',
      'railYHeight',
      'scrollbarY',
      'scrollbarYHeight',
      'scrollTop',
      'y',
      'scrollbarYRail' ]);
  }

function bindMouseScrollHandler(
    i,
    ref
  ) {
    var containerHeight = ref[0];
    var contentHeight = ref[1];
    var pageY = ref[2];
    var railYHeight = ref[3];
    var scrollbarY = ref[4];
    var scrollbarYHeight = ref[5];
    var scrollTop = ref[6];
    var y = ref[7];
    var scrollbarYRail = ref[8];

var element = i.element;

var startingScrollTop = null;
    var startingMousePageY = null;
    var scrollBy = null;

function mouseMoveHandler(e) {
      if (e.touches && e.touches[0]) {
        e[pageY] = e.touches[0].pageY;
      }
      element[scrollTop] =
        startingScrollTop + scrollBy * (e[pageY] - startingMousePageY);
      addScrollingClass(i, y);
      updateGeometry(i);

e.stopPropagation();
      e.preventDefault();
    }

function mouseUpHandler() {
      removeScrollingClass(i, y);
      i[scrollbarYRail].classList.remove(cls.state.clicking);
      i.event.unbind(i.ownerDocument, 'mousemove', mouseMoveHandler);
    }

i[scrollbarYRail].classList.add(cls.state.clicking);

e.stopPropagation();
    }

i.event.bind(i[scrollbarY], 'mousedown', function (e) {
      bindMoves(e);
    });
    i.event.bind(i[scrollbarY], 'touchstart', function (e) {
      bindMoves(e, true);
    });
  }

function keyboard(i) {
    var element = i.element;

var elementHovered = function () { return matches(element, ':hover'); };
    var scrollbarFocused = function () { return matches(i.scrollbarX, ':focus') || matches(i.scrollbarY, ':focus'); };

i.event.bind(i.ownerDocument, 'keydown', function (e) {
      if (
        (e.isDefaultPrevented && e.isDefaultPrevented()) ||
        e.defaultPrevented
      ) {
        return;
      }

if (!elementHovered() && !scrollbarFocused()) {
        return;
      }

var deltaX = 0;
      var deltaY = 0;

switch (e.which) {
        case 37: // left
          if (e.metaKey) {
            deltaX = -i.contentWidth;
          } else if (e.altKey) {
            deltaX = -i.containerWidth;
          } else {
            deltaX = -30;
          }
          break;
        case 38: // up
          if (e.metaKey) {
            deltaY = i.contentHeight;
          } else if (e.altKey) {
            deltaY = i.containerHeight;
          } else {
            deltaY = 30;
          }
          break;
        case 39: // right
          if (e.metaKey) {
            deltaX = i.contentWidth;
          } else if (e.altKey) {
            deltaX = i.containerWidth;
          } else {
            deltaX = 30;
          }
          break;
        case 40: // down
          if (e.metaKey) {
            deltaY = -i.contentHeight;
          } else if (e.altKey) {
            deltaY = -i.containerHeight;
          } else {
            deltaY = -30;
          }
          break;
        case 32: // space bar
          if (e.shiftKey) {
            deltaY = i.containerHeight;
          } else {
            deltaY = -i.containerHeight;
          }
          break;
        case 33: // page up
          deltaY = i.containerHeight;
          break;
        case 34: // page down
          deltaY = -i.containerHeight;
          break;
        case 36: // home
          deltaY = i.contentHeight;
          break;
        case 35: // end
          deltaY = -i.contentHeight;
          break;
        default:
          return;
      }

if (i.settings.suppressScrollX && deltaX !== 0) {
        return;
      }
      if (i.settings.suppressScrollY && deltaY !== 0) {
        return;
      }

element.scrollTop -= deltaY;
      element.scrollLeft += deltaX;
      updateGeometry(i);

if (shouldPreventDefault(deltaX, deltaY)) {
        e.preventDefault();
      }
    });
  }

function wheel(i) {
    var element = i.element;

function shouldPreventDefault(deltaX, deltaY) {
      var roundedScrollTop = Math.floor(element.scrollTop);
      var isTop = element.scrollTop === 0;
      var isBottom =
        roundedScrollTop + element.offsetHeight === element.scrollHeight;
      var isLeft = element.scrollLeft === 0;
      var isRight =
        element.scrollLeft + element.offsetWidth === element.scrollWidth;

var hitsBound;

// pick axis with primary direction
      if (Math.abs(deltaY) > Math.abs(deltaX)) {
        hitsBound = isTop || isBottom;
      } else {
        hitsBound = isLeft || isRight;
      }

return hitsBound ? !i.settings.wheelPropagation : true;
    }

function getDeltaFromEvent(e) {
      var deltaX = e.deltaX;
      var deltaY = -1 * e.deltaY;

if (typeof deltaX === 'undefined' || typeof deltaY === 'undefined') {
        // OS X Safari
        deltaX = (-1 * e.wheelDeltaX) / 6;
        deltaY = e.wheelDeltaY / 6;
      }

if (e.deltaMode && e.deltaMode === 1) {
        // Firefox in deltaMode 1: Line scrolling
        deltaX *= 10;
        deltaY *= 10;
      }

if (deltaX !== deltaX && deltaY !== deltaY /* NaN checks */) {
        // IE in some mouse drivers
        deltaX = 0;
        deltaY = e.wheelDelta;
      }

if (e.shiftKey) {
        // reverse axis with shift key
        return [-deltaY, -deltaX];
      }
      return [deltaX, deltaY];
    }

function shouldBeConsumedByChild(target, deltaX, deltaY) {
      // FIXME: this is a workaround for <select> issue in FF and IE #571
      if (!env.isWebKit && element.querySelector('select:focus')) {
        return true;
      }

if (!element.contains(target)) {
        return false;
      }

var cursor = target;

while (cursor && cursor !== element) {
        if (cursor.classList.contains(cls.element.consuming)) {
          return true;
        }

var style = get(cursor);

// if deltaY && vertical scrollable
        if (deltaY && style.overflowY.match(/(scroll|auto)/)) {
          var maxScrollTop = cursor.scrollHeight - cursor.clientHeight;
          if (maxScrollTop > 0) {
            if (
              (cursor.scrollTop > 0 && deltaY < 0) ||
              (cursor.scrollTop < maxScrollTop && deltaY > 0)
            ) {
              return true;
            }
          }
        }
        // if deltaX && horizontal scrollable
        if (deltaX && style.overflowX.match(/(scroll|auto)/)) {
          var maxScrollLeft = cursor.scrollWidth - cursor.clientWidth;
          if (maxScrollLeft > 0) {
            if (
              (cursor.scrollLeft > 0 && deltaX < 0) ||
              (cursor.scrollLeft < maxScrollLeft && deltaX > 0)
            ) {
              return true;
            }
          }
        }

cursor = cursor.parentNode;
      }

return false;
    }

function mousewheelHandler(e) {
      var ref = getDeltaFromEvent(e);
      var deltaX = ref[0];
      var deltaY = ref[1];

if (shouldBeConsumedByChild(e.target, deltaX, deltaY)) {
        return;
      }

updateGeometry(i);

shouldPrevent = shouldPrevent || shouldPreventDefault(deltaX, deltaY);
      if (shouldPrevent && !e.ctrlKey) {
        e.stopPropagation();
        e.preventDefault();
      }
    }

if (typeof window.onwheel !== 'undefined') {
      i.event.bind(element, 'wheel', mousewheelHandler);
    } else if (typeof window.onmousewheel !== 'undefined') {
      i.event.bind(element, 'mousewheel', mousewheelHandler);
    }
  }

function touch(i) {
    if (!env.supportsTouch && !env.supportsIePointer) {
      return;
    }

var element = i.element;

function shouldPrevent(deltaX, deltaY) {
      var scrollTop = Math.floor(element.scrollTop);
      var scrollLeft = element.scrollLeft;
      var magnitudeX = Math.abs(deltaX);
      var magnitudeY = Math.abs(deltaY);

if (magnitudeY > magnitudeX) {
        // user is perhaps trying to swipe up/down the page

if (
          (deltaY < 0 && scrollTop === i.contentHeight - i.containerHeight) ||
          (deltaY > 0 && scrollTop === 0)
        ) {
          // set prevent for mobile Chrome refresh
          return window.scrollY === 0 && deltaY > 0 && env.isChrome;
        }
      } else if (magnitudeX > magnitudeY) {
        // user is perhaps trying to swipe left/right across the page

if (
          (deltaX < 0 && scrollLeft === i.contentWidth - i.containerWidth) ||
          (deltaX > 0 && scrollLeft === 0)
        ) {
          return true;
        }
      }

return true;
    }

function applyTouchMove(differenceX, differenceY) {
      element.scrollTop -= differenceY;
      element.scrollLeft -= differenceX;

updateGeometry(i);
    }

var startOffset = {};
    var startTime = 0;
    var speed = {};
    var easingLoop = null;

function getTouch(e) {
      if (e.targetTouches) {
        return e.targetTouches[0];
      } else {
        // Maybe IE pointer
        return e;
      }
    }

function touchStart(e) {
      if (!shouldHandle(e)) {
        return;
      }

var touch = getTouch(e);

startOffset.pageX = touch.pageX;
      startOffset.pageY = touch.pageY;

startTime = new Date().getTime();

if (easingLoop !== null) {
        clearInterval(easingLoop);
      }
    }

function shouldBeConsumedByChild(target, deltaX, deltaY) {
      if (!element.contains(target)) {
        return false;
      }

var cursor = target;

while (cursor && cursor !== element) {
        if (cursor.classList.contains(cls.element.consuming)) {
          return true;
        }

var style = get(cursor);

cursor = cursor.parentNode;
      }

return false;
    }

function touchMove(e) {
      if (shouldHandle(e)) {
        var touch = getTouch(e);

var currentOffset = { pageX: touch.pageX, pageY: touch.pageY };

var differenceX = currentOffset.pageX - startOffset.pageX;
        var differenceY = currentOffset.pageY - startOffset.pageY;

if (shouldBeConsumedByChild(e.target, differenceX, differenceY)) {
          return;
        }

applyTouchMove(differenceX, differenceY);
        startOffset = currentOffset;

var currentTime = new Date().getTime();

var timeGap = currentTime - startTime;
        if (timeGap > 0) {
          speed.x = differenceX / timeGap;
          speed.y = differenceY / timeGap;
          startTime = currentTime;
        }

if (shouldPrevent(differenceX, differenceY)) {
          e.preventDefault();
        }
      }
    }
    function touchEnd() {
      if (i.settings.swipeEasing) {
        clearInterval(easingLoop);
        easingLoop = setInterval(function() {
          if (i.isInitialized) {
            clearInterval(easingLoop);
            return;
          }

if (!speed.x && !speed.y) {
            clearInterval(easingLoop);
            return;
          }

if (Math.abs(speed.x) < 0.01 && Math.abs(speed.y) < 0.01) {
            clearInterval(easingLoop);
            return;
          }

applyTouchMove(speed.x * 30, speed.y * 30);

speed.x *= 0.8;
          speed.y *= 0.8;
        }, 10);
      }
    }

if (env.supportsTouch) {
      i.event.bind(element, 'touchstart', touchStart);
      i.event.bind(element, 'touchmove', touchMove);
      i.event.bind(element, 'touchend', touchEnd);
    } else if (env.supportsIePointer) {
      if (window.PointerEvent) {
        i.event.bind(element, 'pointerdown', touchStart);
        i.event.bind(element, 'pointermove', touchMove);
        i.event.bind(element, 'pointerup', touchEnd);
      } else if (window.MSPointerEvent) {
        i.event.bind(element, 'MSPointerDown', touchStart);
        i.event.bind(element, 'MSPointerMove', touchMove);
        i.event.bind(element, 'MSPointerUp', touchEnd);
      }
    }
  }

var defaultSettings = function () { return ({
    handlers: ['click-rail', 'drag-thumb', 'keyboard', 'wheel', 'touch'],
    maxScrollbarLength: null,
    minScrollbarLength: null,
    scrollingThreshold: 1000,
    scrollXMarginOffset: 0,
    scrollYMarginOffset: 0,
    suppressScrollX: false,
    suppressScrollY: false,
    swipeEasing: true,
    useBothWheelAxes: false,
    wheelPropagation: true,
    wheelSpeed: 1,
  }); };

var handlers = {
    'click-rail': clickRail,
    'drag-thumb': dragThumb,
    keyboard: keyboard,
    wheel: wheel,
    touch: touch,
  };

var PerfectScrollbar = function PerfectScrollbar(element, userSettings) {
    var this$1 = this;
    if ( userSettings === void 0 ) userSettings = {};

if (typeof element === 'string') {
      element = document.querySelector(element);
    }

if (!element || !element.nodeName) {
      throw new Error('no element is specified to initialize PerfectScrollbar');
    }

this.element = element;

element.classList.add(cls.main);

this.settings = defaultSettings();
    for (var key in userSettings) {
      this.settings[key] = userSettings[key];
    }

this.containerWidth = null;
    this.containerHeight = null;
    this.contentWidth = null;
    this.contentHeight = null;

var focus = function () { return element.classList.add(cls.state.focus); };
    var blur = function () { return element.classList.remove(cls.state.focus); };

this.isRtl = get(element).direction === 'rtl';
    if (this.isRtl === true) {
      element.classList.add(cls.rtl);
    }
    this.isNegativeScroll = (function () {
      var originalScrollLeft = element.scrollLeft;
      var result = null;
      element.scrollLeft = -1;
      result = element.scrollLeft < 0;
      element.scrollLeft = originalScrollLeft;
      return result;
    })();
    this.negativeScrollAdjustment = this.isNegativeScroll
      ? element.scrollWidth - element.clientWidth
      : 0;
    this.event = new EventManager();
    this.ownerDocument = element.ownerDocument || document;

this.scrollbarXRail = div(cls.element.rail('x'));
    element.appendChild(this.scrollbarXRail);
    this.scrollbarX = div(cls.element.thumb('x'));
    this.scrollbarXRail.appendChild(this.scrollbarX);
    this.scrollbarX.setAttribute('tabindex', 0);
    this.event.bind(this.scrollbarX, 'focus', focus);
    this.event.bind(this.scrollbarX, 'blur', blur);
    this.scrollbarXActive = null;
    this.scrollbarXWidth = null;
    this.scrollbarXLeft = null;
    var railXStyle = get(this.scrollbarXRail);
    this.scrollbarXBottom = parseInt(railXStyle.bottom, 10);
    if (isNaN(this.scrollbarXBottom)) {
      this.isScrollbarXUsingBottom = false;
      this.scrollbarXTop = toInt(railXStyle.top);
    } else {
      this.isScrollbarXUsingBottom = true;
    }
    this.railBorderXWidth =
      toInt(railXStyle.borderLeftWidth) + toInt(railXStyle.borderRightWidth);
    // Set rail to display:block to calculate margins
    set(this.scrollbarXRail, { display: 'block' });
    this.railXMarginWidth =
      toInt(railXStyle.marginLeft) + toInt(railXStyle.marginRight);
    set(this.scrollbarXRail, { display: '' });
    this.railXWidth = null;
    this.railXRatio = null;

this.scrollbarYRail = div(cls.element.rail('y'));
    element.appendChild(this.scrollbarYRail);
    this.scrollbarY = div(cls.element.thumb('y'));
    this.scrollbarYRail.appendChild(this.scrollbarY);
    this.scrollbarY.setAttribute('tabindex', 0);
    this.event.bind(this.scrollbarY, 'focus', focus);
    this.event.bind(this.scrollbarY, 'blur', blur);
    this.scrollbarYActive = null;
    this.scrollbarYHeight = null;
    this.scrollbarYTop = null;
    var railYStyle = get(this.scrollbarYRail);
    this.scrollbarYRight = parseInt(railYStyle.right, 10);
    if (isNaN(this.scrollbarYRight)) {
      this.isScrollbarYUsingRight = false;
      this.scrollbarYLeft = toInt(railYStyle.left);
    } else {
      this.isScrollbarYUsingRight = true;
    }
    this.scrollbarYOuterWidth = this.isRtl ? outerWidth(this.scrollbarY) : null;
    this.railBorderYWidth =
      toInt(railYStyle.borderTopWidth) + toInt(railYStyle.borderBottomWidth);
    set(this.scrollbarYRail, { display: 'block' });
    this.railYMarginHeight =
      toInt(railYStyle.marginTop) + toInt(railYStyle.marginBottom);
    set(this.scrollbarYRail, { display: '' });
    this.railYHeight = null;
    this.railYRatio = null;

this.reach = {
      x:
        element.scrollLeft <= 0
          ? 'start'
          : element.scrollLeft >= this.contentWidth - this.containerWidth
          ? 'end'
          : null,
      y:
        element.scrollTop <= 0
          ? 'start'
          : element.scrollTop >= this.contentHeight - this.containerHeight
          ? 'end'
          : null,
    };

this.isAlive = true;

this.settings.handlers.forEach(function (handlerName) { return handlers[handlerName](this$1); });

this.lastScrollTop = Math.floor(element.scrollTop); // for onScroll only
    this.lastScrollLeft = element.scrollLeft; // for onScroll only
    this.event.bind(this.element, 'scroll', function (e) { return this$1.onScroll(e); });
    updateGeometry(this);
  };

PerfectScrollbar.prototype.update = function update () {
    if (!this.isAlive) {
      return;
    }

// Recalcuate negative scrollLeft adjustment
    this.negativeScrollAdjustment = this.isNegativeScroll
      ? this.element.scrollWidth - this.element.clientWidth
      : 0;

// Recalculate rail margins
    set(this.scrollbarXRail, { display: 'block' });
    set(this.scrollbarYRail, { display: 'block' });
    this.railXMarginWidth =
      toInt(get(this.scrollbarXRail).marginLeft) +
      toInt(get(this.scrollbarXRail).marginRight);
    this.railYMarginHeight =
      toInt(get(this.scrollbarYRail).marginTop) +
      toInt(get(this.scrollbarYRail).marginBottom);

// Hide scrollbars not to affect scrollWidth and scrollHeight
    set(this.scrollbarXRail, { display: 'none' });
    set(this.scrollbarYRail, { display: 'none' });

updateGeometry(this);

processScrollDiff(this, 'top', 0, false, true);
    processScrollDiff(this, 'left', 0, false, true);

set(this.scrollbarXRail, { display: '' });
    set(this.scrollbarYRail, { display: '' });
  };

PerfectScrollbar.prototype.onScroll = function onScroll (e) {
    if (!this.isAlive) {
      return;
    }

updateGeometry(this);
    processScrollDiff(this, 'top', this.element.scrollTop - this.lastScrollTop);
    processScrollDiff(
      this,
      'left',
      this.element.scrollLeft - this.lastScrollLeft
    );

this.lastScrollTop = Math.floor(this.element.scrollTop);
    this.lastScrollLeft = this.element.scrollLeft;
  };

PerfectScrollbar.prototype.destroy = function destroy () {
    if (!this.isAlive) {
      return;
    }

this.event.unbindAll();
    remove(this.scrollbarX);
    remove(this.scrollbarY);
    remove(this.scrollbarXRail);
    remove(this.scrollbarYRail);
    this.removePsClasses();

// unset elements
    this.element = null;
    this.scrollbarX = null;
    this.scrollbarY = null;
    this.scrollbarXRail = null;
    this.scrollbarYRail = null;

this.isAlive = false;
  };

PerfectScrollbar.prototype.removePsClasses = function removePsClasses () {
    this.element.className = this.element.className
      .split(' ')
      .filter(function (name) { return !name.match(/^ps([-_].+|)$/); })
      .join(' ');
  };

return PerfectScrollbar;

})));

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