Subversion-Projekte lars-tiefland.webanos.marine-sales.de

/*!

 * perfect-scrollbar v1.3.0

 * (c) 2017 Hyunje Jun

 * @license MIT

 */

(function (global, factory) {

	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :

	typeof define === 'function' && define.amd ? define(factory) :

	(global.PerfectScrollbar = factory());

}(this, (function () { 'use strict';

function get(element) {

  return getComputedStyle(element);

}

function set(element, obj) {

  for (var key in obj) {

    var val = obj[key];

    if (typeof val === 'number') {

      val = val + "px";

    }

    element.style[key] = val;

  }

  return 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.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); }

  );

}

var cls = {

  main: 'ps',

  element: {

    thumb: function (x) { return ("ps__thumb-" + x); },

    rail: function (x) { return ("ps__rail-" + x); },

    consuming: 'ps__child--consume',

  },

  state: {

    focus: 'ps--focus',

    active: function (x) { return ("ps--active-" + x); },

    scrolling: function (x) { return ("ps--scrolling-" + x); },

  },

};

/*

 * 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 () {

    var this$1 = this;

  for (var name in this$1.handlers) {

    this$1.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 createEvent(name) {

  if (typeof window.CustomEvent === 'function') {

    return new CustomEvent(name);

  } else {

    var evt = document.createEvent('CustomEvent');

    evt.initCustomEvent(name, false, false, undefined);

    return evt;

  }

}

var processScrollDiff = function(

  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 ||

      (window.DocumentTouch && document instanceof window.DocumentTouch)),

  supportsIePointer:

    typeof navigator !== 'undefined' && navigator.msMaxTouchPoints,

  isChrome:

    typeof navigator !== 'undefined' &&

    /Chrome/i.test(navigator && navigator.userAgent),

};

var updateGeometry = function(i) {

  var element = i.element;

  i.containerWidth = element.clientWidth;

  i.containerHeight = element.clientHeight;

  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(

      element.scrollTop *

        (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 = 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 getThumbSize(i, thumbSize) {

  if (i.settings.minScrollbarLength) {

    thumbSize = Math.max(thumbSize, i.settings.minScrollbarLength);

  }

  if (i.settings.maxScrollbarLength) {

    thumbSize = Math.min(thumbSize, i.settings.maxScrollbarLength);

  }

  return thumbSize;

}

function updateCss(element, i) {

  var xRailOffset = { width: i.railXWidth };

  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 - element.scrollTop;

  } else {

    xRailOffset.top = i.scrollbarXTop + element.scrollTop;

  }

  set(i.scrollbarXRail, xRailOffset);

  var yRailOffset = { top: element.scrollTop, height: i.railYHeight };

  if (i.isScrollbarYUsingRight) {

    if (i.isRtl) {

      yRailOffset.right =

        i.contentWidth -

        (i.negativeScrollAdjustment + element.scrollLeft) -

        i.scrollbarYRight -

        i.scrollbarYOuterWidth;

    } else {

      yRailOffset.right = i.scrollbarYRight - element.scrollLeft;

    }

  } else {

    if (i.isRtl) {

      yRailOffset.left =

        i.negativeScrollAdjustment +

        element.scrollLeft +

        i.containerWidth * 2 -

        i.contentWidth -

        i.scrollbarYLeft -

        i.scrollbarYOuterWidth;

    } else {

      yRailOffset.left = i.scrollbarYLeft + element.scrollLeft;

    }

  }

  set(i.scrollbarYRail, yRailOffset);

  set(i.scrollbarX, {

    left: i.scrollbarXLeft,

    width: i.scrollbarXWidth - i.railBorderXWidth,

  });

  set(i.scrollbarY, {

    top: i.scrollbarYTop,

    height: i.scrollbarYHeight - i.railBorderYWidth,

  });

}

var clickRail = function(i) {

  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();

  });

};

var dragThumb = function(i) {

  bindMouseScrollHandler(i, [

    'containerWidth',

    'contentWidth',

    'pageX',

    'railXWidth',

    'scrollbarX',

    'scrollbarXWidth',

    'scrollLeft',

    'x' ]);

  bindMouseScrollHandler(i, [

    'containerHeight',

    'contentHeight',

    'pageY',

    'railYHeight',

    'scrollbarY',

    'scrollbarYHeight',

    'scrollTop',

    'y' ]);

};

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 element = i.element;

  var startingScrollTop = null;

  var startingMousePageY = null;

  var scrollBy = null;

  function mouseMoveHandler(e) {

    element[scrollTop] =

      startingScrollTop + scrollBy * (e[pageY] - startingMousePageY);

    addScrollingClass(i, y);

    updateGeometry(i);

    e.stopPropagation();

    e.preventDefault();

  }

  function mouseUpHandler() {

    removeScrollingClass(i, y);

    i.event.unbind(i.ownerDocument, 'mousemove', mouseMoveHandler);

  }

  i.event.bind(i[scrollbarY], 'mousedown', function (e) {

    startingScrollTop = element[scrollTop];

    startingMousePageY = e[pageY];

    scrollBy =

      (i[contentHeight] - i[containerHeight]) /

      (i[railYHeight] - i[scrollbarYHeight]);

    i.event.bind(i.ownerDocument, 'mousemove', mouseMoveHandler);

    i.event.once(i.ownerDocument, 'mouseup', mouseUpHandler);

    e.stopPropagation();

    e.preventDefault();

  });

}

var keyboard = function(i) {

  var element = i.element;

  var elementHovered = function () { return matches(element, ':hover'); };

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

  function shouldPreventDefault(deltaX, deltaY) {

    var scrollTop = element.scrollTop;

    if (deltaX === 0) {

      if (!i.scrollbarYActive) {

        return false;

      }

      if (

        (scrollTop === 0 && deltaY > 0) ||

        (scrollTop >= i.contentHeight - i.containerHeight && deltaY < 0)

      ) {

        return !i.settings.wheelPropagation;

      }

    }

    var scrollLeft = element.scrollLeft;

    if (deltaY === 0) {

      if (!i.scrollbarXActive) {

        return false;

      }

      if (

        (scrollLeft === 0 && deltaX < 0) ||

        (scrollLeft >= i.contentWidth - i.containerWidth && deltaX > 0)

      ) {

        return !i.settings.wheelPropagation;

      }

    }

    return true;

  }

  i.event.bind(i.ownerDocument, 'keydown', function (e) {

    if (

      (e.isDefaultPrevented && e.isDefaultPrevented()) ||

      e.defaultPrevented

    ) {

      return;

    }

    if (!elementHovered() && !scrollbarFocused()) {

      return;

    }

    var activeElement = document.activeElement

      ? document.activeElement

      : i.ownerDocument.activeElement;

    if (activeElement) {

      if (activeElement.tagName === 'IFRAME') {

        activeElement = activeElement.contentDocument.activeElement;

      } else {

        // go deeper if element is a webcomponent

        while (activeElement.shadowRoot) {

          activeElement = activeElement.shadowRoot.activeElement;

        }

      }

      if (isEditable(activeElement)) {

        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();

    }

  });

};

var wheel = function(i) {

  var element = i.element;

  function shouldPreventDefault(deltaX, deltaY) {

    var isTop = element.scrollTop === 0;

    var isBottom =

      element.scrollTop + element.offsetHeight === element.scrollHeight;

    var isLeft = element.scrollLeft === 0;

    var isRight =

      element.scrollLeft + element.offsetWidth === element.offsetWidth;

    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);

      var overflow = [style.overflow, style.overflowX, style.overflowY].join(

        ''

      );

      // if scrollable

      if (overflow.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;

          }

        }

        var maxScrollLeft = cursor.scrollLeft - 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;

    }

    var shouldPrevent = false;

    if (!i.settings.useBothWheelAxes) {

      // deltaX will only be used for horizontal scrolling and deltaY will

      // only be used for vertical scrolling - this is the default

      element.scrollTop -= deltaY * i.settings.wheelSpeed;

      element.scrollLeft += deltaX * i.settings.wheelSpeed;

    } else if (i.scrollbarYActive && !i.scrollbarXActive) {

      // only vertical scrollbar is active and useBothWheelAxes option is

      // active, so let's scroll vertical bar using both mouse wheel axes

      if (deltaY) {

        element.scrollTop -= deltaY * i.settings.wheelSpeed;

      } else {

        element.scrollTop += deltaX * i.settings.wheelSpeed;

      }

      shouldPrevent = true;

    } else if (i.scrollbarXActive && !i.scrollbarYActive) {

      // useBothWheelAxes and only horizontal bar is active, so use both

      // wheel axes for horizontal bar

      if (deltaX) {

        element.scrollLeft += deltaX * i.settings.wheelSpeed;

      } else {

        element.scrollLeft -= deltaY * i.settings.wheelSpeed;

      }

      shouldPrevent = true;

    }

    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);

  }

};

var touch = function(i) {

  if (!env.supportsTouch && !env.supportsIePointer) {

    return;

  }

  var element = i.element;

  function shouldPrevent(deltaX, deltaY) {

    var scrollTop = 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 shouldHandle(e) {

    if (e.pointerType && e.pointerType === 'pen' && e.buttons === 0) {

      return false;

    }

    if (e.targetTouches && e.targetTouches.length === 1) {

      return true;

    }

    if (

      e.pointerType &&

      e.pointerType !== 'mouse' &&

      e.pointerType !== e.MSPOINTER_TYPE_MOUSE

    ) {

      return true;

    }

    return false;

  }

  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);

      var overflow = [style.overflow, style.overflowX, style.overflowY].join(

        ''

      );

      // if scrollable

      if (overflow.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;

          }

        }

        var maxScrollLeft = cursor.scrollLeft - cursor.clientWidth;

        if (maxScrollLeft > 0) {

          if (

            !(cursor.scrollLeft === 0 && deltaX < 0) &&

            !(cursor.scrollLeft === maxScrollLeft && deltaX > 0)

          ) {

            return true;

          }

        }

      }