gsap/ScrollTrigger.js

/*!
 * ScrollTrigger 3.10.3
 * https://greensock.com
 *
 * @license Copyright 2008-2022, GreenSock. All rights reserved.
 * Subject to the terms at https://greensock.com/standard-license or for
 * Club GreenSock members, the agreement issued with that membership.
 * @author: Jack Doyle, jack@greensock.com
*/

/* eslint-disable */
import { Observer, _getTarget, _vertical, _horizontal, _scrollers, _proxies, _getScrollFunc, _getProxyProp, _getVelocityProp } from "./Observer.js";

var gsap,
    _coreInitted,
    _win,
    _doc,
    _docEl,
    _body,
    _root,
    _resizeDelay,
    _toArray,
    _clamp,
    _time2,
    _syncInterval,
    _refreshing,
    _pointerIsDown,
    _transformProp,
    _i,
    _prevWidth,
    _prevHeight,
    _autoRefresh,
    _sort,
    _suppressOverwrites,
    _ignoreResize,
    _normalizer,
    _ignoreMobileResize,
    _baseScreenHeight,
    _baseScreenWidth,
    _limitCallbacks,
    // if true, we'll only trigger callbacks if the active state toggles, so if you scroll immediately past both the start and end positions of a ScrollTrigger (thus inactive to inactive), neither its onEnter nor onLeave will be called. This is useful during startup.
_startup = 1,
    _getTime = Date.now,
    _time1 = _getTime(),
    _lastScrollTime = 0,
    _enabled = 0,
    _pointerDownHandler = function _pointerDownHandler() {
  return _pointerIsDown = 1;
},
    _pointerUpHandler = function _pointerUpHandler() {
  return _pointerIsDown = 0;
},
    _passThrough = function _passThrough(v) {
  return v;
},
    _round = function _round(value) {
  return Math.round(value * 100000) / 100000 || 0;
},
    _windowExists = function _windowExists() {
  return typeof window !== "undefined";
},
    _getGSAP = function _getGSAP() {
  return gsap || _windowExists() && (gsap = window.gsap) && gsap.registerPlugin && gsap;
},
    _isViewport = function _isViewport(e) {
  return !!~_root.indexOf(e);
},
    _getBoundsFunc = function _getBoundsFunc(element) {
  return _getProxyProp(element, "getBoundingClientRect") || (_isViewport(element) ? function () {
    _winOffsets.width = _win.innerWidth;
    _winOffsets.height = _win.innerHeight;
    return _winOffsets;
  } : function () {
    return _getBounds(element);
  });
},
    _getSizeFunc = function _getSizeFunc(scroller, isViewport, _ref) {
  var d = _ref.d,
      d2 = _ref.d2,
      a = _ref.a;
  return (a = _getProxyProp(scroller, "getBoundingClientRect")) ? function () {
    return a()[d];
  } : function () {
    return (isViewport ? _win["inner" + d2] : scroller["client" + d2]) || 0;
  };
},
    _getOffsetsFunc = function _getOffsetsFunc(element, isViewport) {
  return !isViewport || ~_proxies.indexOf(element) ? _getBoundsFunc(element) : function () {
    return _winOffsets;
  };
},
    _maxScroll = function _maxScroll(element, _ref2) {
  var s = _ref2.s,
      d2 = _ref2.d2,
      d = _ref2.d,
      a = _ref2.a;
  return (s = "scroll" + d2) && (a = _getProxyProp(element, s)) ? a() - _getBoundsFunc(element)()[d] : _isViewport(element) ? (_docEl[s] || _body[s]) - (_win["inner" + d2] || _docEl["client" + d2] || _body["client" + d2]) : element[s] - element["offset" + d2];
},
    _iterateAutoRefresh = function _iterateAutoRefresh(func, events) {
  for (var i = 0; i < _autoRefresh.length; i += 3) {
    (!events || ~events.indexOf(_autoRefresh[i + 1])) && func(_autoRefresh[i], _autoRefresh[i + 1], _autoRefresh[i + 2]);
  }
},
    _isString = function _isString(value) {
  return typeof value === "string";
},
    _isFunction = function _isFunction(value) {
  return typeof value === "function";
},
    _isNumber = function _isNumber(value) {
  return typeof value === "number";
},
    _isObject = function _isObject(value) {
  return typeof value === "object";
},
    _callIfFunc = function _callIfFunc(value) {
  return _isFunction(value) && value();
},
    _combineFunc = function _combineFunc(f1, f2) {
  return function () {
    var result1 = _callIfFunc(f1),
        result2 = _callIfFunc(f2);

    return function () {
      _callIfFunc(result1);

      _callIfFunc(result2);
    };
  };
},
    _endAnimation = function _endAnimation(animation, reversed, pause) {
  return animation && animation.progress(reversed ? 0 : 1) && pause && animation.pause();
},
    _callback = function _callback(self, func) {
  if (self.enabled) {
    var result = func(self);
    result && result.totalTime && (self.callbackAnimation = result);
  }
},
    _abs = Math.abs,
    _scrollLeft = "scrollLeft",
    _scrollTop = "scrollTop",
    _left = "left",
    _top = "top",
    _right = "right",
    _bottom = "bottom",
    _width = "width",
    _height = "height",
    _Right = "Right",
    _Left = "Left",
    _Top = "Top",
    _Bottom = "Bottom",
    _padding = "padding",
    _margin = "margin",
    _Width = "Width",
    _Height = "Height",
    _px = "px",
    _getComputedStyle = function _getComputedStyle(element) {
  return _win.getComputedStyle(element);
},
    _makePositionable = function _makePositionable(element) {
  // if the element already has position: absolute or fixed, leave that, otherwise make it position: relative
  var position = _getComputedStyle(element).position;

  element.style.position = position === "absolute" || position === "fixed" ? position : "relative";
},
    _setDefaults = function _setDefaults(obj, defaults) {
  for (var p in defaults) {
    p in obj || (obj[p] = defaults[p]);
  }

  return obj;
},
    _getBounds = function _getBounds(element, withoutTransforms) {
  var tween = withoutTransforms && _getComputedStyle(element)[_transformProp] !== "matrix(1, 0, 0, 1, 0, 0)" && gsap.to(element, {
    x: 0,
    y: 0,
    xPercent: 0,
    yPercent: 0,
    rotation: 0,
    rotationX: 0,
    rotationY: 0,
    scale: 1,
    skewX: 0,
    skewY: 0
  }).progress(1),
      bounds = element.getBoundingClientRect();
  tween && tween.progress(0).kill();
  return bounds;
},
    _getSize = function _getSize(element, _ref3) {
  var d2 = _ref3.d2;
  return element["offset" + d2] || element["client" + d2] || 0;
},
    _getLabelRatioArray = function _getLabelRatioArray(timeline) {
  var a = [],
      labels = timeline.labels,
      duration = timeline.duration(),
      p;

  for (p in labels) {
    a.push(labels[p] / duration);
  }

  return a;
},
    _getClosestLabel = function _getClosestLabel(animation) {
  return function (value) {
    return gsap.utils.snap(_getLabelRatioArray(animation), value);
  };
},
    _snapDirectional = function _snapDirectional(snapIncrementOrArray) {
  var snap = gsap.utils.snap(snapIncrementOrArray),
      a = Array.isArray(snapIncrementOrArray) && snapIncrementOrArray.slice(0).sort(function (a, b) {
    return a - b;
  });
  return a ? function (value, direction, threshold) {
    if (threshold === void 0) {
      threshold = 1e-3;
    }

    var i;

    if (!direction) {
      return snap(value);
    }

    if (direction > 0) {
      value -= threshold; // to avoid rounding errors. If we're too strict, it might snap forward, then immediately again, and again.

      for (i = 0; i < a.length; i++) {
        if (a[i] >= value) {
          return a[i];
        }
      }

      return a[i - 1];
    } else {
      i = a.length;
      value += threshold;

      while (i--) {
        if (a[i] <= value) {
          return a[i];
        }
      }
    }

    return a[0];
  } : function (value, direction, threshold) {
    if (threshold === void 0) {
      threshold = 1e-3;
    }

    var snapped = snap(value);
    return !direction || Math.abs(snapped - value) < threshold || snapped - value < 0 === direction < 0 ? snapped : snap(direction < 0 ? value - snapIncrementOrArray : value + snapIncrementOrArray);
  };
},
    _getLabelAtDirection = function _getLabelAtDirection(timeline) {
  return function (value, st) {
    return _snapDirectional(_getLabelRatioArray(timeline))(value, st.direction);
  };
},
    _multiListener = function _multiListener(func, element, types, callback) {
  return types.split(",").forEach(function (type) {
    return func(element, type, callback);
  });
},
    _addListener = function _addListener(element, type, func, nonPassive, capture) {
  return element.addEventListener(type, func, {
    passive: !nonPassive,
    capture: !!capture
  });
},
    _removeListener = function _removeListener(element, type, func) {
  return element.removeEventListener(type, func);
},
    _wheelListener = function _wheelListener(func, el, scrollFunc) {
  return scrollFunc && scrollFunc.wheelHandler && func(el, "wheel", scrollFunc);
},
    _markerDefaults = {
  startColor: "green",
  endColor: "red",
  indent: 0,
  fontSize: "16px",
  fontWeight: "normal"
},
    _defaults = {
  toggleActions: "play",
  anticipatePin: 0
},
    _keywords = {
  top: 0,
  left: 0,
  center: 0.5,
  bottom: 1,
  right: 1
},
    _offsetToPx = function _offsetToPx(value, size) {
  if (_isString(value)) {
    var eqIndex = value.indexOf("="),
        relative = ~eqIndex ? +(value.charAt(eqIndex - 1) + 1) * parseFloat(value.substr(eqIndex + 1)) : 0;

    if (~eqIndex) {
      value.indexOf("%") > eqIndex && (relative *= size / 100);
      value = value.substr(0, eqIndex - 1);
    }

    value = relative + (value in _keywords ? _keywords[value] * size : ~value.indexOf("%") ? parseFloat(value) * size / 100 : parseFloat(value) || 0);
  }

  return value;
},
    _createMarker = function _createMarker(type, name, container, direction, _ref4, offset, matchWidthEl, containerAnimation) {
  var startColor = _ref4.startColor,
      endColor = _ref4.endColor,
      fontSize = _ref4.fontSize,
      indent = _ref4.indent,
      fontWeight = _ref4.fontWeight;

  var e = _doc.createElement("div"),
      useFixedPosition = _isViewport(container) || _getProxyProp(container, "pinType") === "fixed",
      isScroller = type.indexOf("scroller") !== -1,
      parent = useFixedPosition ? _body : container,
      isStart = type.indexOf("start") !== -1,
      color = isStart ? startColor : endColor,
      css = "border-color:" + color + ";font-size:" + fontSize + ";color:" + color + ";font-weight:" + fontWeight + ";pointer-events:none;white-space:nowrap;font-family:sans-serif,Arial;z-index:1000;padding:4px 8px;border-width:0;border-style:solid;";

  css += "position:" + ((isScroller || containerAnimation) && useFixedPosition ? "fixed;" : "absolute;");
  (isScroller || containerAnimation || !useFixedPosition) && (css += (direction === _vertical ? _right : _bottom) + ":" + (offset + parseFloat(indent)) + "px;");
  matchWidthEl && (css += "box-sizing:border-box;text-align:left;width:" + matchWidthEl.offsetWidth + "px;");
  e._isStart = isStart;
  e.setAttribute("class", "gsap-marker-" + type + (name ? " marker-" + name : ""));
  e.style.cssText = css;
  e.innerText = name || name === 0 ? type + "-" + name : type;
  parent.children[0] ? parent.insertBefore(e, parent.children[0]) : parent.appendChild(e);
  e._offset = e["offset" + direction.op.d2];

  _positionMarker(e, 0, direction, isStart);

  return e;
},
    _positionMarker = function _positionMarker(marker, start, direction, flipped) {
  var vars = {
    display: "block"
  },
      side = direction[flipped ? "os2" : "p2"],
      oppositeSide = direction[flipped ? "p2" : "os2"];
  marker._isFlipped = flipped;
  vars[direction.a + "Percent"] = flipped ? -100 : 0;
  vars[direction.a] = flipped ? "1px" : 0;
  vars["border" + side + _Width] = 1;
  vars["border" + oppositeSide + _Width] = 0;
  vars[direction.p] = start + "px";
  gsap.set(marker, vars);
},
    _triggers = [],
    _ids = {},
    _rafID,
    _sync = function _sync() {
  return _getTime() - _lastScrollTime > 34 && _updateAll();
},
    _onScroll = function _onScroll() {
  // previously, we tried to optimize performance by batching/deferring to the next requestAnimationFrame(), but discovered that Safari has a few bugs that make this unworkable (especially on iOS). See https://codepen.io/GreenSock/pen/16c435b12ef09c38125204818e7b45fc?editors=0010 and https://codepen.io/GreenSock/pen/JjOxYpQ/3dd65ccec5a60f1d862c355d84d14562?editors=0010 and https://codepen.io/GreenSock/pen/ExbrPNa/087cef197dc35445a0951e8935c41503?editors=0010
  if (!_normalizer || !_normalizer.isPressed) {
    _scrollers.cache++;
    _rafID || (_rafID = requestAnimationFrame(_updateAll));
    _lastScrollTime || _dispatch("scrollStart");
    _lastScrollTime = _getTime();
  }
},
    _setBaseDimensions = function _setBaseDimensions() {
  _baseScreenWidth = _win.innerWidth;
  _baseScreenHeight = _win.innerHeight;
},
    _onResize = function _onResize() {
  _scrollers.cache++;
  !_refreshing && !_ignoreResize && !_doc.fullscreenElement && (!_ignoreMobileResize || _baseScreenWidth !== _win.innerWidth || Math.abs(_win.innerHeight - _baseScreenHeight) > _win.innerHeight * 0.25) && _resizeDelay.restart(true);
},
    // ignore resizes triggered by refresh()
_listeners = {},
    _emptyArray = [],
    _media = [],
    _creatingMedia,
    // when ScrollTrigger.matchMedia() is called, we record the current media key here (like "(min-width: 800px)") so that we can assign it to everything that's created during that call. Then we can revert just those when necessary. In the ScrollTrigger's init() call, the _creatingMedia is recorded as a "media" property on the instance.
_lastMediaTick,
    _onMediaChange = function _onMediaChange(e) {
  var tick = gsap.ticker.frame,
      matches = [],
      i = 0,
      index;

  if (_lastMediaTick !== tick || _startup) {
    _revertAll();

    for (; i < _media.length; i += 4) {
      index = _win.matchMedia(_media[i]).matches;

      if (index !== _media[i + 3]) {
        // note: some browsers fire the matchMedia event multiple times, like when going full screen, so we shouldn't call the function multiple times. Check to see if it's already matched.
        _media[i + 3] = index;
        index ? matches.push(i) : _revertAll(1, _media[i]) || _isFunction(_media[i + 2]) && _media[i + 2](); // Firefox doesn't update the "matches" property of the MediaQueryList object correctly - it only does so as it calls its change handler - so we must re-create a media query here to ensure it's accurate.
      }
    }

    _revertRecorded(); // in case killing/reverting any of the animations actually added inline styles back.


    for (i = 0; i < matches.length; i++) {
      index = matches[i];
      _creatingMedia = _media[index];
      _media[index + 2] = _media[index + 1](e);
    }

    _creatingMedia = 0;
    _coreInitted && _refreshAll(0, 1);
    _lastMediaTick = tick;

    _dispatch("matchMedia");
  }
},
    _softRefresh = function _softRefresh() {
  return _removeListener(ScrollTrigger, "scrollEnd", _softRefresh) || _refreshAll(true);
},
    _dispatch = function _dispatch(type) {
  return _listeners[type] && _listeners[type].map(function (f) {
    return f();
  }) || _emptyArray;
},
    _savedStyles = [],
    // when ScrollTrigger.saveStyles() is called, the inline styles are recorded in this Array in a sequential format like [element, cssText, gsCache, media]. This keeps it very memory-efficient and fast to iterate through.
_revertRecorded = function _revertRecorded(media) {
  for (var i = 0; i < _savedStyles.length; i += 5) {
    if (!media || _savedStyles[i + 4] === media) {
      _savedStyles[i].style.cssText = _savedStyles[i + 1];
      _savedStyles[i].getBBox && _savedStyles[i].setAttribute("transform", _savedStyles[i + 2] || "");
      _savedStyles[i + 3].uncache = 1;
    }
  }
},
    _revertAll = function _revertAll(kill, media) {
  var trigger;

  for (_i = 0; _i < _triggers.length; _i++) {
    trigger = _triggers[_i];

    if (!media || trigger.media === media) {
      if (kill) {
        trigger.kill(1);
      } else {
        trigger.revert();
      }
    }
  }

  media && _revertRecorded(media);
  media || _dispatch("revert");
},
    _clearScrollMemory = function _clearScrollMemory() {
  return _scrollers.cache++ && _scrollers.forEach(function (obj) {
    return typeof obj === "function" && (obj.rec = 0);
  });
},
    // zero-out all the recorded scroll positions. Don't use _triggers because if, for example, .matchMedia() is used to create some ScrollTriggers and then the user resizes and it removes ALL ScrollTriggers, and then go back to a size where there are ScrollTriggers, it would have kept the position(s) saved from the initial state.
_refreshingAll,
    _refreshID = 0,
    _refreshAll = function _refreshAll(force, skipRevert) {
  if (_lastScrollTime && !force) {
    _addListener(ScrollTrigger, "scrollEnd", _softRefresh);

    return;
  }

  _refreshingAll = true;

  var refreshInits = _dispatch("refreshInit");

  _sort && ScrollTrigger.sort();
  skipRevert || _revertAll();

  _triggers.slice(0).forEach(function (t) {
    return t.refresh();
  }); // don't loop with _i because during a refresh() someone could call ScrollTrigger.update() which would iterate through _i resulting in a skip.


  _triggers.forEach(function (t) {
    return t.vars.end === "max" && t.setPositions(t.start, _maxScroll(t.scroller, t._dir));
  }); // the scroller's max scroll position may change after all the ScrollTriggers refreshed (like pinning could push it down), so we need to loop back and correct any with end: "max".


  refreshInits.forEach(function (result) {
    return result && result.render && result.render(-1);
  }); // if the onRefreshInit() returns an animation (typically a gsap.set()), revert it. This makes it easy to put things in a certain spot before refreshing for measurement purposes, and then put things back.

  _clearScrollMemory();

  _resizeDelay.pause();

  _refreshID++;
  _refreshingAll = false;

  _dispatch("refresh");
},
    _lastScroll = 0,
    _direction = 1,
    _primary,
    _updateAll = function _updateAll() {
  if (!_refreshingAll) {
    _primary && _primary.update(0); // ScrollSmoother users refreshPriority -9999 to become the primary that gets updated before all others because it affects the scroll position.

    ScrollTrigger.isUpdating = true;

    var l = _triggers.length,
        time = _getTime(),
        recordVelocity = time - _time1 >= 50,
        scroll = l && _triggers[0].scroll();

    _direction = _lastScroll > scroll ? -1 : 1;
    _lastScroll = scroll;

    if (recordVelocity) {
      if (_lastScrollTime && !_pointerIsDown && time - _lastScrollTime > 200) {
        _lastScrollTime = 0;

        _dispatch("scrollEnd");
      }

      _time2 = _time1;
      _time1 = time;
    }

    if (_direction < 0) {
      _i = l;

      while (_i-- > 0) {
        _triggers[_i] && _triggers[_i].update(0, recordVelocity);
      }

      _direction = 1;
    } else {
      for (_i = 0; _i < l; _i++) {
        _triggers[_i] && _triggers[_i].update(0, recordVelocity);
      }
    }

    ScrollTrigger.isUpdating = false;
  }

  _rafID = 0;
},
    _propNamesToCopy = [_left, _top, _bottom, _right, _margin + _Bottom, _margin + _Right, _margin + _Top, _margin + _Left, "display", "flexShrink", "float", "zIndex", "gridColumnStart", "gridColumnEnd", "gridRowStart", "gridRowEnd", "gridArea", "justifySelf", "alignSelf", "placeSelf", "order"],
    _stateProps = _propNamesToCopy.concat([_width, _height, "boxSizing", "max" + _Width, "max" + _Height, "position", _margin, _padding, _padding + _Top, _padding + _Right, _padding + _Bottom, _padding + _Left]),
    _swapPinOut = function _swapPinOut(pin, spacer, state) {
  _setState(state);

  var cache = pin._gsap;

  if (cache.spacerIsNative) {
    _setState(cache.spacerState);
  } else if (pin.parentNode === spacer) {
    var parent = spacer.parentNode;

    if (parent) {
      parent.insertBefore(pin, spacer);
      parent.removeChild(spacer);
    }
  }
},
    _swapPinIn = function _swapPinIn(pin, spacer, cs, spacerState) {
  if (pin.parentNode !== spacer) {
    var i = _propNamesToCopy.length,
        spacerStyle = spacer.style,
        pinStyle = pin.style,
        p;

    while (i--) {
      p = _propNamesToCopy[i];
      spacerStyle[p] = cs[p];
    }

    spacerStyle.position = cs.position === "absolute" ? "absolute" : "relative";
    cs.display === "inline" && (spacerStyle.display = "inline-block");
    pinStyle[_bottom] = pinStyle[_right] = spacerStyle.flexBasis = "auto";
    spacerStyle.overflow = "visible";
    spacerStyle.boxSizing = "border-box";
    spacerStyle[_width] = _getSize(pin, _horizontal) + _px;
    spacerStyle[_height] = _getSize(pin, _vertical) + _px;
    spacerStyle[_padding] = pinStyle[_margin] = pinStyle[_top] = pinStyle[_left] = "0";

    _setState(spacerState);

    pinStyle[_width] = pinStyle["max" + _Width] = cs[_width];
    pinStyle[_height] = pinStyle["max" + _Height] = cs[_height];
    pinStyle[_padding] = cs[_padding];
    pin.parentNode.insertBefore(spacer, pin);
    spacer.appendChild(pin);
  }
},
    _capsExp = /([A-Z])/g,
    _setState = function _setState(state) {
  if (state) {
    var style = state.t.style,
        l = state.length,
        i = 0,
        p,
        value;
    (state.t._gsap || gsap.core.getCache(state.t)).uncache = 1; // otherwise transforms may be off

    for (; i < l; i += 2) {
      value = state[i + 1];
      p = state[i];

      if (value) {
        style[p] = value;
      } else if (style[p]) {
        style.removeProperty(p.replace(_capsExp, "-$1").toLowerCase());
      }
    }
  }
},
    _getState = function _getState(element) {
  // returns an Array with alternating values like [property, value, property, value] and a "t" property pointing to the target (element). Makes it fast and cheap.
  var l = _stateProps.length,
      style = element.style,
      state = [],
      i = 0;

  for (; i < l; i++) {
    state.push(_stateProps[i], style[_stateProps[i]]);
  }

  state.t = element;
  return state;
},
    _copyState = function _copyState(state, override, omitOffsets) {
  var result = [],
      l = state.length,
      i = omitOffsets ? 8 : 0,
      // skip top, left, right, bottom if omitOffsets is true
  p;

  for (; i < l; i += 2) {
    p = state[i];
    result.push(p, p in override ? override[p] : state[i + 1]);
  }

  result.t = state.t;
  return result;
},
    _winOffsets = {
  left: 0,
  top: 0
},
    // // potential future feature (?) Allow users to calculate where a trigger hits (scroll position) like getScrollPosition("#id", "top bottom")
// _getScrollPosition = (trigger, position, {scroller, containerAnimation, horizontal}) => {
// 	scroller = _getTarget(scroller || _win);
// 	let direction = horizontal ? _horizontal : _vertical,
// 		isViewport = _isViewport(scroller);
// 	_getSizeFunc(scroller, isViewport, direction);
// 	return _parsePosition(position, _getTarget(trigger), _getSizeFunc(scroller, isViewport, direction)(), direction, _getScrollFunc(scroller, direction)(), 0, 0, 0, _getOffsetsFunc(scroller, isViewport)(), isViewport ? 0 : parseFloat(_getComputedStyle(scroller)["border" + direction.p2 + _Width]) || 0, 0, containerAnimation ? containerAnimation.duration() : _maxScroll(scroller), containerAnimation);
// },
_parsePosition = function _parsePosition(value, trigger, scrollerSize, direction, scroll, marker, markerScroller, self, scrollerBounds, borderWidth, useFixedPosition, scrollerMax, containerAnimation) {
  _isFunction(value) && (value = value(self));

  if (_isString(value) && value.substr(0, 3) === "max") {
    value = scrollerMax + (value.charAt(4) === "=" ? _offsetToPx("0" + value.substr(3), scrollerSize) : 0);
  }

  var time = containerAnimation ? containerAnimation.time() : 0,
      p1,
      p2,
      element;
  containerAnimation && containerAnimation.seek(0);

  if (!_isNumber(value)) {
    _isFunction(trigger) && (trigger = trigger(self));
    var offsets = value.split(" "),
        bounds,
        localOffset,
        globalOffset,
        display;
    element = _getTarget(trigger) || _body;
    bounds = _getBounds(element) || {};

    if ((!bounds || !bounds.left && !bounds.top) && _getComputedStyle(element).display === "none") {
      // if display is "none", it won't report getBoundingClientRect() properly
      display = element.style.display;
      element.style.display = "block";
      bounds = _getBounds(element);
      display ? element.style.display = display : element.style.removeProperty("display");
    }

    localOffset = _offsetToPx(offsets[0], bounds[direction.d]);
    globalOffset = _offsetToPx(offsets[1] || "0", scrollerSize);
    value = bounds[direction.p] - scrollerBounds[direction.p] - borderWidth + localOffset + scroll - globalOffset;
    markerScroller && _positionMarker(markerScroller, globalOffset, direction, scrollerSize - globalOffset < 20 || markerScroller._isStart && globalOffset > 20);
    scrollerSize -= scrollerSize - globalOffset; // adjust for the marker
  } else if (markerScroller) {
    _positionMarker(markerScroller, scrollerSize, direction, true);
  }

  if (marker) {
    var position = value + scrollerSize,
        isStart = marker._isStart;
    p1 = "scroll" + direction.d2;

    _positionMarker(marker, position, direction, isStart && position > 20 || !isStart && (useFixedPosition ? Math.max(_body[p1], _docEl[p1]) : marker.parentNode[p1]) <= position + 1);

    if (useFixedPosition) {
      scrollerBounds = _getBounds(markerScroller);
      useFixedPosition && (marker.style[direction.op.p] = scrollerBounds[direction.op.p] - direction.op.m - marker._offset + _px);
    }
  }

  if (containerAnimation && element) {
    p1 = _getBounds(element);
    containerAnimation.seek(scrollerMax);
    p2 = _getBounds(element);
    containerAnimation._caScrollDist = p1[direction.p] - p2[direction.p];
    value = value / containerAnimation._caScrollDist * scrollerMax;
  }

  containerAnimation && containerAnimation.seek(time);
  return containerAnimation ? value : Math.round(value);
},
    _prefixExp = /(webkit|moz|length|cssText|inset)/i,
    _reparent = function _reparent(element, parent, top, left) {
  if (element.parentNode !== parent) {
    var style = element.style,
        p,
        cs;

    if (parent === _body) {
      element._stOrig = style.cssText; // record original inline styles so we can revert them later

      cs = _getComputedStyle(element);

      for (p in cs) {
        // must copy all relevant styles to ensure that nothing changes visually when we reparent to the <body>. Skip the vendor prefixed ones.
        if (!+p && !_prefixExp.test(p) && cs[p] && typeof style[p] === "string" && p !== "0") {
          style[p] = cs[p];
        }
      }

      style.top = top;
      style.left = left;
    } else {
      style.cssText = element._stOrig;
    }

    gsap.core.getCache(element).uncache = 1;
    parent.appendChild(element);
  }
},
    // _mergeAnimations = animations => {
// 	let tl = gsap.timeline({smoothChildTiming: true}).startTime(Math.min(...animations.map(a => a.globalTime(0))));
// 	animations.forEach(a => {let time = a.totalTime(); tl.add(a); a.totalTime(time); });
// 	tl.smoothChildTiming = false;
// 	return tl;
// },
// returns a function that can be used to tween the scroll position in the direction provided, and when doing so it'll add a .tween property to the FUNCTION itself, and remove it when the tween completes or gets killed. This gives us a way to have multiple ScrollTriggers use a central function for any given scroller and see if there's a scroll tween running (which would affect if/how things get updated)
_getTweenCreator = function _getTweenCreator(scroller, direction) {
  var getScroll = _getScrollFunc(scroller, direction),
      prop = "_scroll" + direction.p2,
      // add a tweenable property to the scroller that's a getter/setter function, like _scrollTop or _scrollLeft. This way, if someone does gsap.killTweensOf(scroller) it'll kill the scroll tween.
  lastScroll1,
      lastScroll2,
      getTween = function getTween(scrollTo, vars, initialValue, change1, change2) {
    var tween = getTween.tween,
        onComplete = vars.onComplete,
        modifiers = {};
    initialValue = initialValue || getScroll();
    change2 = change1 && change2 || 0; // if change1 is 0, we set that to the difference and ignore change2. Otherwise, there would be a compound effect.

    change1 = change1 || scrollTo - initialValue;
    tween && tween.kill();
    lastScroll1 = Math.round(initialValue);
    vars[prop] = scrollTo;
    vars.modifiers = modifiers;

    modifiers[prop] = function (value) {
      value = _round(getScroll()); // round because in some [very uncommon] Windows environments, it can get reported with decimals even though it was set without.

      if (value !== lastScroll1 && value !== lastScroll2 && Math.abs(value - lastScroll1) > 2 && Math.abs(value - lastScroll2) > 2) {
        // if the user scrolls, kill the tween. iOS Safari intermittently misreports the scroll position, it may be the most recently-set one or the one before that! When Safari is zoomed (CMD-+), it often misreports as 1 pixel off too! So if we set the scroll position to 125, for example, it'll actually report it as 124.
        tween.kill();
        getTween.tween = 0;
      } else {
        value = initialValue + change1 * tween.ratio + change2 * tween.ratio * tween.ratio;
      }

      lastScroll2 = lastScroll1;
      return lastScroll1 = _round(value);
    };

    vars.onComplete = function () {
      getTween.tween = 0;
      onComplete && onComplete.call(tween);
    };

    tween = getTween.tween = gsap.to(scroller, vars);
    return tween;
  };

  scroller[prop] = getScroll;

  getScroll.wheelHandler = function () {
    return getTween.tween && getTween.tween.kill() && (getTween.tween = 0);
  };

  _addListener(scroller, "wheel", getScroll.wheelHandler); // Windows machines handle mousewheel scrolling in chunks (like "3 lines per scroll") meaning the typical strategy for cancelling the scroll isn't as sensitive. It's much more likely to match one of the previous 2 scroll event positions. So we kill any snapping as soon as there's a wheel event.


  return getTween;
};

export var ScrollTrigger = /*#__PURE__*/function () {
  function ScrollTrigger(vars, animation) {
    _coreInitted || ScrollTrigger.register(gsap) || console.warn("Please gsap.registerPlugin(ScrollTrigger)");
    this.init(vars, animation);
  }

  var _proto = ScrollTrigger.prototype;

  _proto.init = function init(vars, animation) {
    this.progress = this.start = 0;
    this.vars && this.kill(true, true); // in case it's being initted again

    if (!_enabled) {
      this.update = this.refresh = this.kill = _passThrough;
      return;
    }

    vars = _setDefaults(_isString(vars) || _isNumber(vars) || vars.nodeType ? {
      trigger: vars
    } : vars, _defaults);

    var _vars = vars,
        onUpdate = _vars.onUpdate,
        toggleClass = _vars.toggleClass,
        id = _vars.id,
        onToggle = _vars.onToggle,
        onRefresh = _vars.onRefresh,
        scrub = _vars.scrub,
        trigger = _vars.trigger,
        pin = _vars.pin,
        pinSpacing = _vars.pinSpacing,
        invalidateOnRefresh = _vars.invalidateOnRefresh,
        anticipatePin = _vars.anticipatePin,
        onScrubComplete = _vars.onScrubComplete,
        onSnapComplete = _vars.onSnapComplete,
        once = _vars.once,
        snap = _vars.snap,
        pinReparent = _vars.pinReparent,
        pinSpacer = _vars.pinSpacer,
        containerAnimation = _vars.containerAnimation,
        fastScrollEnd = _vars.fastScrollEnd,
        preventOverlaps = _vars.preventOverlaps,
        direction = vars.horizontal || vars.containerAnimation && vars.horizontal !== false ? _horizontal : _vertical,
        isToggle = !scrub && scrub !== 0,
        scroller = _getTarget(vars.scroller || _win),
        scrollerCache = gsap.core.getCache(scroller),
        isViewport = _isViewport(scroller),
        useFixedPosition = ("pinType" in vars ? vars.pinType : _getProxyProp(scroller, "pinType") || isViewport && "fixed") === "fixed",
        callbacks = [vars.onEnter, vars.onLeave, vars.onEnterBack, vars.onLeaveBack],
        toggleActions = isToggle && vars.toggleActions.split(" "),
        markers = "markers" in vars ? vars.markers : _defaults.markers,
        borderWidth = isViewport ? 0 : parseFloat(_getComputedStyle(scroller)["border" + direction.p2 + _Width]) || 0,
        self = this,
        onRefreshInit = vars.onRefreshInit && function () {
      return vars.onRefreshInit(self);
    },
        getScrollerSize = _getSizeFunc(scroller, isViewport, direction),
        getScrollerOffsets = _getOffsetsFunc(scroller, isViewport),
        lastSnap = 0,
        lastRefresh = 0,
        scrollFunc = _getScrollFunc(scroller, direction),
        tweenTo,
        pinCache,
        snapFunc,
        scroll1,
        scroll2,
        start,
        end,
        markerStart,
        markerEnd,
        markerStartTrigger,
        markerEndTrigger,
        markerVars,
        change,
        pinOriginalState,
        pinActiveState,
        pinState,
        spacer,
        offset,
        pinGetter,
        pinSetter,
        pinStart,
        pinChange,
        spacingStart,
        spacerState,
        markerStartSetter,
        markerEndSetter,
        cs,
        snap1,
        snap2,
        scrubTween,
        scrubSmooth,
        snapDurClamp,
        snapDelayedCall,
        prevProgress,
        prevScroll,
        prevAnimProgress,
        caMarkerSetter,
        customRevertReturn;

    self.media = _creatingMedia;
    self._dir = direction;
    anticipatePin *= 45;
    self.scroller = scroller;
    self.scroll = containerAnimation ? containerAnimation.time.bind(containerAnimation) : scrollFunc;
    scroll1 = scrollFunc();
    self.vars = vars;
    animation = animation || vars.animation;

    if ("refreshPriority" in vars) {
      _sort = 1;
      vars.refreshPriority === -9999 && (_primary = self); // used by ScrollSmoother
    }

    scrollerCache.tweenScroll = scrollerCache.tweenScroll || {
      top: _getTweenCreator(scroller, _vertical),
      left: _getTweenCreator(scroller, _horizontal)
    };
    self.tweenTo = tweenTo = scrollerCache.tweenScroll[direction.p];

    self.scrubDuration = function (value) {
      scrubSmooth = _isNumber(value) && value;

      if (!scrubSmooth) {
        scrubTween && scrubTween.progress(1).kill();
        scrubTween = 0;
      } else {
        scrubTween ? scrubTween.duration(value) : scrubTween = gsap.to(animation, {
          ease: "expo",
          totalProgress: "+=0.001",
          duration: scrubSmooth,
          paused: true,
          onComplete: function onComplete() {
            return onScrubComplete && onScrubComplete(self);
          }
        });
      }
    };

    if (animation) {
      animation.vars.lazy = false;
      animation._initted || animation.vars.immediateRender !== false && vars.immediateRender !== false && animation.render(0, true, true);
      self.animation = animation.pause();
      animation.scrollTrigger = self;
      self.scrubDuration(scrub);
      snap1 = 0;
      id || (id = animation.vars.id);
    }

    _triggers.push(self);

    if (snap) {
      if (!_isObject(snap) || snap.push) {
        snap = {
          snapTo: snap
        };
      }

      "scrollBehavior" in _body.style && gsap.set(isViewport ? [_body, _docEl] : scroller, {
        scrollBehavior: "auto"
      }); // smooth scrolling doesn't work with snap.

      snapFunc = _isFunction(snap.snapTo) ? snap.snapTo : snap.snapTo === "labels" ? _getClosestLabel(animation) : snap.snapTo === "labelsDirectional" ? _getLabelAtDirection(animation) : snap.directional !== false ? function (value, st) {
        return _snapDirectional(snap.snapTo)(value, _getTime() - lastRefresh < 500 ? 0 : st.direction);
      } : gsap.utils.snap(snap.snapTo);
      snapDurClamp = snap.duration || {
        min: 0.1,
        max: 2
      };
      snapDurClamp = _isObject(snapDurClamp) ? _clamp(snapDurClamp.min, snapDurClamp.max) : _clamp(snapDurClamp, snapDurClamp);
      snapDelayedCall = gsap.delayedCall(snap.delay || scrubSmooth / 2 || 0.1, function () {
        var scroll = scrollFunc(),
            refreshedRecently = _getTime() - lastRefresh < 500,
            tween = tweenTo.tween;

        if ((refreshedRecently || Math.abs(self.getVelocity()) < 10) && !tween && !_pointerIsDown && lastSnap !== scroll) {
          var progress = (scroll - start) / change,
              totalProgress = animation && !isToggle ? animation.totalProgress() : progress,
              velocity = refreshedRecently ? 0 : (totalProgress - snap2) / (_getTime() - _time2) * 1000 || 0,
              change1 = gsap.utils.clamp(-progress, 1 - progress, _abs(velocity / 2) * velocity / 0.185),
              naturalEnd = progress + (snap.inertia === false ? 0 : change1),
              endValue = _clamp(0, 1, snapFunc(naturalEnd, self)),
              endScroll = Math.round(start + endValue * change),
              _snap = snap,
              onStart = _snap.onStart,
              _onInterrupt = _snap.onInterrupt,
              _onComplete = _snap.onComplete;

          if (scroll <= end && scroll >= start && endScroll !== scroll) {
            if (tween && !tween._initted && tween.data <= _abs(endScroll - scroll)) {
              // there's an overlapping snap! So we must figure out which one is closer and let that tween live.
              return;
            }

            if (snap.inertia === false) {
              change1 = endValue - progress;
            }

            tweenTo(endScroll, {
              duration: snapDurClamp(_abs(Math.max(_abs(naturalEnd - totalProgress), _abs(endValue - totalProgress)) * 0.185 / velocity / 0.05 || 0)),
              ease: snap.ease || "power3",
              data: _abs(endScroll - scroll),
              // record the distance so that if another snap tween occurs (conflict) we can prioritize the closest snap.
              onInterrupt: function onInterrupt() {
                return snapDelayedCall.restart(true) && _onInterrupt && _onInterrupt(self);
              },
              onComplete: function onComplete() {
                self.update();
                lastSnap = scrollFunc();
                snap1 = snap2 = animation && !isToggle ? animation.totalProgress() : self.progress;
                onSnapComplete && onSnapComplete(self);
                _onComplete && _onComplete(self);
              }
            }, scroll, change1 * change, endScroll - scroll - change1 * change);
            onStart && onStart(self, tweenTo.tween);
          }
        } else if (self.isActive && lastSnap !== scroll) {
          snapDelayedCall.restart(true);
        }
      }).pause();
    }

    id && (_ids[id] = self);
    trigger = self.trigger = _getTarget(trigger || pin); // if a trigger has some kind of scroll-related effect applied that could contaminate the "y" or "x" position (like a ScrollSmoother effect), we needed a way to temporarily revert it, so we use the stRevert property of the gsCache. It can return another function that we'll call at the end so it can return to its normal state.

    customRevertReturn = trigger && trigger._gsap && trigger._gsap.stRevert;
    customRevertReturn && (customRevertReturn = customRevertReturn(self));
    pin = pin === true ? trigger : _getTarget(pin);
    _isString(toggleClass) && (toggleClass = {
      targets: trigger,
      className: toggleClass
    });

    if (pin) {
      pinSpacing === false || pinSpacing === _margin || (pinSpacing = !pinSpacing && _getComputedStyle(pin.parentNode).display === "flex" ? false : _padding); // if the parent is display: flex, don't apply pinSpacing by default.

      self.pin = pin;
      vars.force3D !== false && gsap.set(pin, {
        force3D: true
      });
      pinCache = gsap.core.getCache(pin);

      if (!pinCache.spacer) {
        // record the spacer and pinOriginalState on the cache in case someone tries pinning the same element with MULTIPLE ScrollTriggers - we don't want to have multiple spacers or record the "original" pin state after it has already been affected by another ScrollTrigger.
        if (pinSpacer) {
          pinSpacer = _getTarget(pinSpacer);
          pinSpacer && !pinSpacer.nodeType && (pinSpacer = pinSpacer.current || pinSpacer.nativeElement); // for React & Angular

          pinCache.spacerIsNative = !!pinSpacer;
          pinSpacer && (pinCache.spacerState = _getState(pinSpacer));
        }

        pinCache.spacer = spacer = pinSpacer || _doc.createElement("div");
        spacer.classList.add("pin-spacer");
        id && spacer.classList.add("pin-spacer-" + id);
        pinCache.pinState = pinOriginalState = _getState(pin);
      } else {
        pinOriginalState = pinCache.pinState;
      }

      self.spacer = spacer = pinCache.spacer;
      cs = _getComputedStyle(pin);
      spacingStart = cs[pinSpacing + direction.os2];
      pinGetter = gsap.getProperty(pin);
      pinSetter = gsap.quickSetter(pin, direction.a, _px); // pin.firstChild && !_maxScroll(pin, direction) && (pin.style.overflow = "hidden"); // protects from collapsing margins, but can have unintended consequences as demonstrated here: https://codepen.io/GreenSock/pen/1e42c7a73bfa409d2cf1e184e7a4248d so it was removed in favor of just telling people to set up their CSS to avoid the collapsing margins (overflow: hidden | auto is just one option. Another is border-top: 1px solid transparent).

      _swapPinIn(pin, spacer, cs);

      pinState = _getState(pin);
    }

    if (markers) {
      markerVars = _isObject(markers) ? _setDefaults(markers, _markerDefaults) : _markerDefaults;
      markerStartTrigger = _createMarker("scroller-start", id, scroller, direction, markerVars, 0);
      markerEndTrigger = _createMarker("scroller-end", id, scroller, direction, markerVars, 0, markerStartTrigger);
      offset = markerStartTrigger["offset" + direction.op.d2];

      var content = _getTarget(_getProxyProp(scroller, "content") || scroller);

      markerStart = this.markerStart = _createMarker("start", id, content, direction, markerVars, offset, 0, containerAnimation);
      markerEnd = this.markerEnd = _createMarker("end", id, content, direction, markerVars, offset, 0, containerAnimation);
      containerAnimation && (caMarkerSetter = gsap.quickSetter([markerStart, markerEnd], direction.a, _px));

      if (!useFixedPosition && !(_proxies.length && _getProxyProp(scroller, "fixedMarkers") === true)) {
        _makePositionable(isViewport ? _body : scroller);

        gsap.set([markerStartTrigger, markerEndTrigger], {
          force3D: true
        });
        markerStartSetter = gsap.quickSetter(markerStartTrigger, direction.a, _px);
        markerEndSetter = gsap.quickSetter(markerEndTrigger, direction.a, _px);
      }
    }

    if (containerAnimation) {
      var oldOnUpdate = containerAnimation.vars.onUpdate,
          oldParams = containerAnimation.vars.onUpdateParams;
      containerAnimation.eventCallback("onUpdate", function () {
        self.update(0, 0, 1);
        oldOnUpdate && oldOnUpdate.apply(oldParams || []);
      });
    }

    self.previous = function () {
      return _triggers[_triggers.indexOf(self) - 1];
    };

    self.next = function () {
      return _triggers[_triggers.indexOf(self) + 1];
    };

    self.revert = function (revert) {
      var r = revert !== false || !self.enabled,
          prevRefreshing = _refreshing;

      if (r !== self.isReverted) {
        if (r) {
          self.scroll.rec || !_refreshing || !_refreshingAll || (self.scroll.rec = scrollFunc());
          prevScroll = Math.max(scrollFunc(), self.scroll.rec || 0); // record the scroll so we can revert later (repositioning/pinning things can affect scroll position). In the static refresh() method, we first record all the scroll positions as a reference.

          prevProgress = self.progress;
          prevAnimProgress = animation && animation.progress();
        }

        markerStart && [markerStart, markerEnd, markerStartTrigger, markerEndTrigger].forEach(function (m) {
          return m.style.display = r ? "none" : "block";
        });
        r && (_refreshing = 1);
        self.update(r); // make sure the pin is back in its original position so that all the measurements are correct.

        _refreshing = prevRefreshing;
        pin && (r ? _swapPinOut(pin, spacer, pinOriginalState) : (!pinReparent || !self.isActive) && _swapPinIn(pin, spacer, _getComputedStyle(pin), spacerState));
        self.isReverted = r;
      }
    };

    self.refresh = function (soft, force) {
      if ((_refreshing || !self.enabled) && !force) {
        return;
      }

      if (pin && soft && _lastScrollTime) {
        _addListener(ScrollTrigger, "scrollEnd", _softRefresh);

        return;
      }

      !_refreshingAll && onRefreshInit && onRefreshInit(self);
      _refreshing = 1;
      lastRefresh = _getTime();

      if (tweenTo.tween) {
        tweenTo.tween.kill();
        tweenTo.tween = 0;
      }

      scrubTween && scrubTween.pause();
      invalidateOnRefresh && animation && animation.time(-0.01, true).invalidate();
      self.isReverted || self.revert();

      var size = getScrollerSize(),
          scrollerBounds = getScrollerOffsets(),
          max = containerAnimation ? containerAnimation.duration() : _maxScroll(scroller, direction),
          offset = 0,
          otherPinOffset = 0,
          parsedEnd = vars.end,
          parsedEndTrigger = vars.endTrigger || trigger,
          parsedStart = vars.start || (vars.start === 0 || !trigger ? 0 : pin ? "0 0" : "0 100%"),
          pinnedContainer = self.pinnedContainer = vars.pinnedContainer && _getTarget(vars.pinnedContainer),
          triggerIndex = trigger && Math.max(0, _triggers.indexOf(self)) || 0,
          i = triggerIndex,
          cs,
          bounds,
          scroll,
          isVertical,
          override,
          curTrigger,
          curPin,
          oppositeScroll,
          initted,
          revertedPins;

      while (i--) {
        // user might try to pin the same element more than once, so we must find any prior triggers with the same pin, revert them, and determine how long they're pinning so that we can offset things appropriately. Make sure we revert from last to first so that things "rewind" properly.
        curTrigger = _triggers[i];
        curTrigger.end || curTrigger.refresh(0, 1) || (_refreshing = 1); // if it's a timeline-based trigger that hasn't been fully initialized yet because it's waiting for 1 tick, just force the refresh() here, otherwise if it contains a pin that's supposed to affect other ScrollTriggers further down the page, they won't be adjusted properly.

        curPin = curTrigger.pin;

        if (curPin && (curPin === trigger || curPin === pin) && !curTrigger.isReverted) {
          revertedPins || (revertedPins = []);
          revertedPins.unshift(curTrigger); // we'll revert from first to last to make sure things reach their end state properly

          curTrigger.revert();
        }

        if (curTrigger !== _triggers[i]) {
          // in case it got removed.
          triggerIndex--;
          i--;
        }
      }

      _isFunction(parsedStart) && (parsedStart = parsedStart(self));
      start = _parsePosition(parsedStart, trigger, size, direction, scrollFunc(), markerStart, markerStartTrigger, self, scrollerBounds, borderWidth, useFixedPosition, max, containerAnimation) || (pin ? -0.001 : 0);
      _isFunction(parsedEnd) && (parsedEnd = parsedEnd(self));

      if (_isString(parsedEnd) && !parsedEnd.indexOf("+=")) {
        if (~parsedEnd.indexOf(" ")) {
          parsedEnd = (_isString(parsedStart) ? parsedStart.split(" ")[0] : "") + parsedEnd;
        } else {
          offset = _offsetToPx(parsedEnd.substr(2), size);
          parsedEnd = _isString(parsedStart) ? parsedStart : start + offset; // _parsePosition won't factor in the offset if the start is a number, so do it here.

          parsedEndTrigger = trigger;
        }
      }

      end = Math.max(start, _parsePosition(parsedEnd || (parsedEndTrigger ? "100% 0" : max), parsedEndTrigger, size, direction, scrollFunc() + offset, markerEnd, markerEndTrigger, self, scrollerBounds, borderWidth, useFixedPosition, max, containerAnimation)) || -0.001;
      change = end - start || (start -= 0.01) && 0.001;
      offset = 0;
      i = triggerIndex;

      while (i--) {
        curTrigger = _triggers[i];
        curPin = curTrigger.pin;

        if (curPin && curTrigger.start - curTrigger._pinPush < start && !containerAnimation && curTrigger.end > 0) {
          cs = curTrigger.end - curTrigger.start;

          if ((curPin === trigger || curPin === pinnedContainer) && !_isNumber(parsedStart)) {
            // numeric start values shouldn't be offset at all - treat them as absolute
            offset += cs * (1 - curTrigger.progress);
          }

          curPin === pin && (otherPinOffset += cs);
        }
      }

      start += offset;
      end += offset;
      self._pinPush = otherPinOffset;

      if (markerStart && offset) {
        // offset the markers if necessary
        cs = {};
        cs[direction.a] = "+=" + offset;
        pinnedContainer && (cs[direction.p] = "-=" + scrollFunc());
        gsap.set([markerStart, markerEnd], cs);
      }

      if (pin) {
        cs = _getComputedStyle(pin);
        isVertical = direction === _vertical;
        scroll = scrollFunc(); // recalculate because the triggers can affect the scroll

        pinStart = parseFloat(pinGetter(direction.a)) + otherPinOffset;
        !max && end > 1 && ((isViewport ? _body : scroller).style["overflow-" + direction.a] = "scroll"); // makes sure the scroller has a scrollbar, otherwise if something has width: 100%, for example, it would be too big (exclude the scrollbar). See https://greensock.com/forums/topic/25182-scrolltrigger-width-of-page-increase-where-markers-are-set-to-false/

        _swapPinIn(pin, spacer, cs);

        pinState = _getState(pin); // transforms will interfere with the top/left/right/bottom placement, so remove them temporarily. getBoundingClientRect() factors in transforms.

        bounds = _getBounds(pin, true);
        oppositeScroll = useFixedPosition && _getScrollFunc(scroller, isVertical ? _horizontal : _vertical)();

        if (pinSpacing) {
          spacerState = [pinSpacing + direction.os2, change + otherPinOffset + _px];
          spacerState.t = spacer;
          i = pinSpacing === _padding ? _getSize(pin, direction) + change + otherPinOffset : 0;
          i && spacerState.push(direction.d, i + _px); // for box-sizing: border-box (must include padding).

          _setState(spacerState);

          useFixedPosition && scrollFunc(prevScroll);
        }

        if (useFixedPosition) {
          override = {
            top: bounds.top + (isVertical ? scroll - start : oppositeScroll) + _px,
            left: bounds.left + (isVertical ? oppositeScroll : scroll - start) + _px,
            boxSizing: "border-box",
            position: "fixed"
          };
          override[_width] = override["max" + _Width] = Math.ceil(bounds.width) + _px;
          override[_height] = override["max" + _Height] = Math.ceil(bounds.height) + _px;
          override[_margin] = override[_margin + _Top] = override[_margin + _Right] = override[_margin + _Bottom] = override[_margin + _Left] = "0";
          override[_padding] = cs[_padding];
          override[_padding + _Top] = cs[_padding + _Top];
          override[_padding + _Right] = cs[_padding + _Right];
          override[_padding + _Bottom] = cs[_padding + _Bottom];
          override[_padding + _Left] = cs[_padding + _Left];
          pinActiveState = _copyState(pinOriginalState, override, pinReparent);
        }

        if (animation) {
          // the animation might be affecting the transform, so we must jump to the end, check the value, and compensate accordingly. Otherwise, when it becomes unpinned, the pinSetter() will get set to a value that doesn't include whatever the animation did.
          initted = animation._initted; // if not, we must invalidate() after this step, otherwise it could lock in starting values prematurely.

          _suppressOverwrites(1);

          animation.render(animation.duration(), true, true);
          pinChange = pinGetter(direction.a) - pinStart + change + otherPinOffset;
          change !== pinChange && pinActiveState.splice(pinActiveState.length - 2, 2); // transform is the last property/value set in the state Array. Since the animation is controlling that, we should omit it.

          animation.render(0, true, true);
          initted || animation.invalidate();

          _suppressOverwrites(0);
        } else {
          pinChange = change;
        }
      } else if (trigger && scrollFunc() && !containerAnimation) {
        // it may be INSIDE a pinned element, so walk up the tree and look for any elements with _pinOffset to compensate because anything with pinSpacing that's already scrolled would throw off the measurements in getBoundingClientRect()
        bounds = trigger.parentNode;

        while (bounds && bounds !== _body) {
          if (bounds._pinOffset) {
            start -= bounds._pinOffset;
            end -= bounds._pinOffset;
          }

          bounds = bounds.parentNode;
        }
      }

      revertedPins && revertedPins.forEach(function (t) {
        return t.revert(false);
      });
      self.start = start;
      self.end = end;
      scroll1 = scroll2 = scrollFunc(); // reset velocity

      if (!containerAnimation) {
        scroll1 < prevScroll && scrollFunc(prevScroll);
        self.scroll.rec = 0;
      }

      self.revert(false);

      if (snapDelayedCall) {
        lastSnap = -1;
        self.isActive && scrollFunc(start + change * prevProgress); // just so snapping gets re-enabled, clear out any recorded last value

        snapDelayedCall.restart(true);
      }

      _refreshing = 0;
      animation && isToggle && (animation._initted || prevAnimProgress) && animation.progress() !== prevAnimProgress && animation.progress(prevAnimProgress, true).render(animation.time(), true, true); // must force a re-render because if saveStyles() was used on the target(s), the styles could have been wiped out during the refresh().

      if (prevProgress !== self.progress || containerAnimation) {
        // ensures that the direction is set properly (when refreshing, progress is set back to 0 initially, then back again to wherever it needs to be) and that callbacks are triggered.
        animation && !isToggle && animation.totalProgress(prevProgress, true); // to avoid issues where animation callbacks like onStart aren't triggered.

        self.progress = prevProgress;
        self.update(0, 0, 1);
      }

      pin && pinSpacing && (spacer._pinOffset = Math.round(self.progress * pinChange)); //			scrubTween && scrubTween.invalidate();

      onRefresh && onRefresh(self);
    };

    self.getVelocity = function () {
      return (scrollFunc() - scroll2) / (_getTime() - _time2) * 1000 || 0;
    };

    self.endAnimation = function () {
      _endAnimation(self.callbackAnimation);

      if (animation) {
        scrubTween ? scrubTween.progress(1) : !animation.paused() ? _endAnimation(animation, animation.reversed()) : isToggle || _endAnimation(animation, self.direction < 0, 1);
      }
    };

    self.labelToScroll = function (label) {
      return animation && animation.labels && (start || self.refresh() || start) + animation.labels[label] / animation.duration() * change || 0;
    };

    self.getTrailing = function (name) {
      var i = _triggers.indexOf(self),
          a = self.direction > 0 ? _triggers.slice(0, i).reverse() : _triggers.slice(i + 1);

      return (_isString(name) ? a.filter(function (t) {
        return t.vars.preventOverlaps === name;
      }) : a).filter(function (t) {
        return self.direction > 0 ? t.end <= start : t.start >= end;
      });
    };

    self.update = function (reset, recordVelocity, forceFake) {
      if (containerAnimation && !forceFake && !reset) {
        return;
      }

      var scroll = self.scroll(),
          p = reset ? 0 : (scroll - start) / change,
          clipped = p < 0 ? 0 : p > 1 ? 1 : p || 0,
          prevProgress = self.progress,
          isActive,
          wasActive,
          toggleState,
          action,
          stateChanged,
          toggled,
          isAtMax,
          isTakingAction;

      if (recordVelocity) {
        scroll2 = scroll1;
        scroll1 = containerAnimation ? scrollFunc() : scroll;

        if (snap) {
          snap2 = snap1;
          snap1 = animation && !isToggle ? animation.totalProgress() : clipped;
        }
      } // anticipate the pinning a few ticks ahead of time based on velocity to avoid a visual glitch due to the fact that most browsers do scrolling on a separate thread (not synced with requestAnimationFrame).


      anticipatePin && !clipped && pin && !_refreshing && !_startup && _lastScrollTime && start < scroll + (scroll - scroll2) / (_getTime() - _time2) * anticipatePin && (clipped = 0.0001);

      if (clipped !== prevProgress && self.enabled) {
        isActive = self.isActive = !!clipped && clipped < 1;
        wasActive = !!prevProgress && prevProgress < 1;
        toggled = isActive !== wasActive;
        stateChanged = toggled || !!clipped !== !!prevProgress; // could go from start all the way to end, thus it didn't toggle but it did change state in a sense (may need to fire a callback)

        self.direction = clipped > prevProgress ? 1 : -1;
        self.progress = clipped;

        if (stateChanged && !_refreshing) {
          toggleState = clipped && !prevProgress ? 0 : clipped === 1 ? 1 : prevProgress === 1 ? 2 : 3; // 0 = enter, 1 = leave, 2 = enterBack, 3 = leaveBack (we prioritize the FIRST encounter, thus if you scroll really fast past the onEnter and onLeave in one tick, it'd prioritize onEnter.

          if (isToggle) {
            action = !toggled && toggleActions[toggleState + 1] !== "none" && toggleActions[toggleState + 1] || toggleActions[toggleState]; // if it didn't toggle, that means it shot right past and since we prioritize the "enter" action, we should switch to the "leave" in this case (but only if one is defined)

            isTakingAction = animation && (action === "complete" || action === "reset" || action in animation);
          }
        }

        preventOverlaps && (toggled || isTakingAction) && (isTakingAction || scrub || !animation) && (_isFunction(preventOverlaps) ? preventOverlaps(self) : self.getTrailing(preventOverlaps).forEach(function (t) {
          return t.endAnimation();
        }));

        if (!isToggle) {
          if (scrubTween && !_refreshing && !_startup) {
            (containerAnimation || _primary && _primary !== self) && scrubTween.render(scrubTween._dp._time - scrubTween._start); // if there's a scrub on both the container animation and this one (or a ScrollSmoother), the update order would cause this one not to have rendered yet, so it wouldn't make any progress before we .restart() it heading toward the new progress so it'd appear stuck thus we force a render here.

            if (scrubTween.resetTo) {
              scrubTween.resetTo("totalProgress", clipped, animation._tTime / animation._tDur);
            } else {
              // legacy support (courtesy), before 3.10.0
              scrubTween.vars.totalProgress = clipped;
              scrubTween.invalidate().restart();
            }
          } else if (animation) {
            animation.totalProgress(clipped, !!_refreshing);
          }
        }

        if (pin) {
          reset && pinSpacing && (spacer.style[pinSpacing + direction.os2] = spacingStart);

          if (!useFixedPosition) {
            pinSetter(_round(pinStart + pinChange * clipped));
          } else if (stateChanged) {
            isAtMax = !reset && clipped > prevProgress && end + 1 > scroll && scroll + 1 >= _maxScroll(scroller, direction); // if it's at the VERY end of the page, don't switch away from position: fixed because it's pointless and it could cause a brief flash when the user scrolls back up (when it gets pinned again)

            if (pinReparent) {
              if (!reset && (isActive || isAtMax)) {
                var bounds = _getBounds(pin, true),
                    _offset = scroll - start;

                _reparent(pin, _body, bounds.top + (direction === _vertical ? _offset : 0) + _px, bounds.left + (direction === _vertical ? 0 : _offset) + _px);
              } else {
                _reparent(pin, spacer);
              }
            }

            _setState(isActive || isAtMax ? pinActiveState : pinState);

            pinChange !== change && clipped < 1 && isActive || pinSetter(pinStart + (clipped === 1 && !isAtMax ? pinChange : 0));
          }
        }

        snap && !tweenTo.tween && !_refreshing && !_startup && snapDelayedCall.restart(true);
        toggleClass && (toggled || once && clipped && (clipped < 1 || !_limitCallbacks)) && _toArray(toggleClass.targets).forEach(function (el) {
          return el.classList[isActive || once ? "add" : "remove"](toggleClass.className);
        }); // classes could affect positioning, so do it even if reset or refreshing is true.

        onUpdate && !isToggle && !reset && onUpdate(self);

        if (stateChanged && !_refreshing) {
          if (isToggle) {
            if (isTakingAction) {
              if (action === "complete") {
                animation.pause().totalProgress(1);
              } else if (action === "reset") {
                animation.restart(true).pause();
              } else if (action === "restart") {
                animation.restart(true);
              } else {
                animation[action]();
              }
            }

            onUpdate && onUpdate(self);
          }

          if (toggled || !_limitCallbacks) {
            // on startup, the page could be scrolled and we don't want to fire callbacks that didn't toggle. For example onEnter shouldn't fire if the ScrollTrigger isn't actually entered.
            onToggle && toggled && _callback(self, onToggle);
            callbacks[toggleState] && _callback(self, callbacks[toggleState]);
            once && (clipped === 1 ? self.kill(false, 1) : callbacks[toggleState] = 0); // a callback shouldn't be called again if once is true.

            if (!toggled) {
              // it's possible to go completely past, like from before the start to after the end (or vice-versa) in which case BOTH callbacks should be fired in that order
              toggleState = clipped === 1 ? 1 : 3;
              callbacks[toggleState] && _callback(self, callbacks[toggleState]);
            }
          }

          if (fastScrollEnd && !isActive && Math.abs(self.getVelocity()) > (_isNumber(fastScrollEnd) ? fastScrollEnd : 2500)) {
            _endAnimation(self.callbackAnimation);

            scrubTween ? scrubTween.progress(1) : _endAnimation(animation, !clipped, 1);
          }
        } else if (isToggle && onUpdate && !_refreshing) {
          onUpdate(self);
        }
      } // update absolutely-positioned markers (only if the scroller isn't the viewport)


      if (markerEndSetter) {
        var n = containerAnimation ? scroll / containerAnimation.duration() * (containerAnimation._caScrollDist || 0) : scroll;
        markerStartSetter(n + (markerStartTrigger._isFlipped ? 1 : 0));
        markerEndSetter(n);
      }

      caMarkerSetter && caMarkerSetter(-scroll / containerAnimation.duration() * (containerAnimation._caScrollDist || 0));
    };

    self.enable = function (reset, refresh) {
      if (!self.enabled) {
        self.enabled = true;

        _addListener(scroller, "resize", _onResize);

        _addListener(isViewport ? _doc : scroller, "scroll", _onScroll);

        onRefreshInit && _addListener(ScrollTrigger, "refreshInit", onRefreshInit);

        if (reset !== false) {
          self.progress = prevProgress = 0;
          scroll1 = scroll2 = lastSnap = scrollFunc();
        }

        refresh !== false && self.refresh();
      }
    };

    self.getTween = function (snap) {
      return snap && tweenTo ? tweenTo.tween : scrubTween;
    };

    self.setPositions = function (newStart, newEnd) {
      // doesn't persist after refresh()! Intended to be a way to override values that were set during refresh(), like you could set it in onRefresh()
      if (pin) {
        pinStart += newStart - start;
        pinChange += newEnd - newStart - change;
      }

      self.start = start = newStart;
      self.end = end = newEnd;
      change = newEnd - newStart;
      self.update();
    };

    self.disable = function (reset, allowAnimation) {
      if (self.enabled) {
        reset !== false && self.revert();
        self.enabled = self.isActive = false;
        allowAnimation || scrubTween && scrubTween.pause();
        prevScroll = 0;
        pinCache && (pinCache.uncache = 1);
        onRefreshInit && _removeListener(ScrollTrigger, "refreshInit", onRefreshInit);

        if (snapDelayedCall) {
          snapDelayedCall.pause();
          tweenTo.tween && tweenTo.tween.kill() && (tweenTo.tween = 0);
        }

        if (!isViewport) {
          var i = _triggers.length;

          while (i--) {
            if (_triggers[i].scroller === scroller && _triggers[i] !== self) {
              return; //don't remove the listeners if there are still other triggers referencing it.
            }
          }

          _removeListener(scroller, "resize", _onResize);

          _removeListener(scroller, "scroll", _onScroll);
        }
      }
    };

    self.kill = function (revert, allowAnimation) {
      self.disable(revert, allowAnimation);
      scrubTween && !allowAnimation && scrubTween.kill();
      id && delete _ids[id];

      var i = _triggers.indexOf(self);

      i >= 0 && _triggers.splice(i, 1);
      i === _i && _direction > 0 && _i--; // if we're in the middle of a refresh() or update(), splicing would cause skips in the index, so adjust...
      // if no other ScrollTrigger instances of the same scroller are found, wipe out any recorded scroll position. Otherwise, in a single page application, for example, it could maintain scroll position when it really shouldn't.

      i = 0;

      _triggers.forEach(function (t) {
        return t.scroller === self.scroller && (i = 1);
      });

      i || (self.scroll.rec = 0);

      if (animation) {
        animation.scrollTrigger = null;
        revert && animation.render(-1);
        allowAnimation || animation.kill();
      }

      markerStart && [markerStart, markerEnd, markerStartTrigger, markerEndTrigger].forEach(function (m) {
        return m.parentNode && m.parentNode.removeChild(m);
      });
      _primary === self && (_primary = 0);

      if (pin) {
        pinCache && (pinCache.uncache = 1);
        i = 0;

        _triggers.forEach(function (t) {
          return t.pin === pin && i++;
        });

        i || (pinCache.spacer = 0); // if there aren't any more ScrollTriggers with the same pin, remove the spacer, otherwise it could be contaminated with old/stale values if the user re-creates a ScrollTrigger for the same element.
      }

      vars.onKill && vars.onKill(self);
    };

    self.enable(false, false);
    customRevertReturn && customRevertReturn(self);
    !animation || !animation.add || change ? self.refresh() : gsap.delayedCall(0.01, function () {
      return start || end || self.refresh();
    }) && (change = 0.01) && (start = end = 0); // if the animation is a timeline, it may not have been populated yet, so it wouldn't render at the proper place on the first refresh(), thus we should schedule one for the next tick. If "change" is defined, we know it must be re-enabling, thus we can refresh() right away.
  };

  ScrollTrigger.register = function register(core) {
    if (!_coreInitted) {
      gsap = core || _getGSAP();
      _windowExists() && window.document && ScrollTrigger.enable();
      _coreInitted = _enabled;
    }

    return _coreInitted;
  };

  ScrollTrigger.defaults = function defaults(config) {
    if (config) {
      for (var p in config) {
        _defaults[p] = config[p];
      }
    }

    return _defaults;
  };

  ScrollTrigger.disable = function disable(reset, kill) {
    _enabled = 0;

    _triggers.forEach(function (trigger) {
      return trigger[kill ? "kill" : "disable"](reset);
    });

    _removeListener(_win, "wheel", _onScroll);

    _removeListener(_doc, "scroll", _onScroll);

    clearInterval(_syncInterval);

    _removeListener(_doc, "touchcancel", _passThrough);

    _removeListener(_body, "touchstart", _passThrough);

    _multiListener(_removeListener, _doc, "pointerdown,touchstart,mousedown", _pointerDownHandler);

    _multiListener(_removeListener, _doc, "pointerup,touchend,mouseup", _pointerUpHandler);

    _resizeDelay.kill();

    _iterateAutoRefresh(_removeListener);

    for (var i = 0; i < _scrollers.length; i += 3) {
      _wheelListener(_removeListener, _scrollers[i], _scrollers[i + 1]);

      _wheelListener(_removeListener, _scrollers[i], _scrollers[i + 2]);
    }
  };

  ScrollTrigger.enable = function enable() {
    _win = window;
    _doc = document;
    _docEl = _doc.documentElement;
    _body = _doc.body;

    if (gsap) {
      _toArray = gsap.utils.toArray;
      _clamp = gsap.utils.clamp;
      _suppressOverwrites = gsap.core.suppressOverwrites || _passThrough;
      gsap.core.globals("ScrollTrigger", ScrollTrigger); // must register the global manually because in Internet Explorer, functions (classes) don't have a "name" property.

      if (_body) {
        _enabled = 1;
        Observer.register(gsap); // isTouch is 0 if no touch, 1 if ONLY touch, and 2 if it can accommodate touch but also other types like mouse/pointer.

        ScrollTrigger.isTouch = Observer.isTouch;

        _addListener(_win, "wheel", _onScroll); // mostly for 3rd party smooth scrolling libraries.


        _root = [_win, _doc, _docEl, _body];
        ScrollTrigger.matchMedia({
          // when orientation changes, we should take new base measurements for the ignoreMobileResize feature.
          "(orientation: portrait)": function orientationPortrait() {
            _setBaseDimensions();

            return _setBaseDimensions;
          }
        });

        _addListener(_doc, "scroll", _onScroll); // some browsers (like Chrome), the window stops dispatching scroll events on the window if you scroll really fast, but it's consistent on the document!


        var bodyStyle = _body.style,
            border = bodyStyle.borderTopStyle,
            bounds,
            i;
        bodyStyle.borderTopStyle = "solid"; // works around an issue where a margin of a child element could throw off the bounds of the _body, making it seem like there's a margin when there actually isn't. The border ensures that the bounds are accurate.

        bounds = _getBounds(_body);
        _vertical.m = Math.round(bounds.top + _vertical.sc()) || 0; // accommodate the offset of the <body> caused by margins and/or padding

        _horizontal.m = Math.round(bounds.left + _horizontal.sc()) || 0;
        border ? bodyStyle.borderTopStyle = border : bodyStyle.removeProperty("border-top-style"); // TODO: (?) maybe move to leveraging the velocity mechanism in Observer and skip intervals.

        _syncInterval = setInterval(_sync, 250);
        gsap.delayedCall(0.5, function () {
          return _startup = 0;
        });

        _addListener(_doc, "touchcancel", _passThrough); // some older Android devices intermittently stop dispatching "touchmove" events if we don't listen for "touchcancel" on the document.


        _addListener(_body, "touchstart", _passThrough); //works around Safari bug: https://greensock.com/forums/topic/21450-draggable-in-iframe-on-mobile-is-buggy/


        _multiListener(_addListener, _doc, "pointerdown,touchstart,mousedown", _pointerDownHandler);

        _multiListener(_addListener, _doc, "pointerup,touchend,mouseup", _pointerUpHandler);

        _transformProp = gsap.utils.checkPrefix("transform");

        _stateProps.push(_transformProp);

        _coreInitted = _getTime();
        _resizeDelay = gsap.delayedCall(0.2, _refreshAll).pause();
        _autoRefresh = [_doc, "visibilitychange", function () {
          var w = _win.innerWidth,
              h = _win.innerHeight;

          if (_doc.hidden) {
            _prevWidth = w;
            _prevHeight = h;
          } else if (_prevWidth !== w || _prevHeight !== h) {
            _onResize();
          }
        }, _doc, "DOMContentLoaded", _refreshAll, _win, "load", _refreshAll, _win, "resize", _onResize];

        _iterateAutoRefresh(_addListener);

        _triggers.forEach(function (trigger) {
          return trigger.enable(0, 1);
        });

        for (i = 0; i < _scrollers.length; i += 3) {
          _wheelListener(_removeListener, _scrollers[i], _scrollers[i + 1]);

          _wheelListener(_removeListener, _scrollers[i], _scrollers[i + 2]);
        }
      }
    }
  };

  ScrollTrigger.config = function config(vars) {
    "limitCallbacks" in vars && (_limitCallbacks = !!vars.limitCallbacks);
    var ms = vars.syncInterval;
    ms && clearInterval(_syncInterval) || (_syncInterval = ms) && setInterval(_sync, ms);
    "ignoreMobileResize" in vars && (_ignoreMobileResize = ScrollTrigger.isTouch === 1 && vars.ignoreMobileResize);

    if ("autoRefreshEvents" in vars) {
      _iterateAutoRefresh(_removeListener) || _iterateAutoRefresh(_addListener, vars.autoRefreshEvents || "none");
      _ignoreResize = (vars.autoRefreshEvents + "").indexOf("resize") === -1;
    }
  };

  ScrollTrigger.scrollerProxy = function scrollerProxy(target, vars) {
    var t = _getTarget(target),
        i = _scrollers.indexOf(t),
        isViewport = _isViewport(t);

    if (~i) {
      _scrollers.splice(i, isViewport ? 6 : 2);
    }

    if (vars) {
      isViewport ? _proxies.unshift(_win, vars, _body, vars, _docEl, vars) : _proxies.unshift(t, vars);
    }
  };

  ScrollTrigger.matchMedia = function matchMedia(vars) {
    // _media is populated in the following order: mediaQueryString, onMatch, onUnmatch, isMatched. So if there are two media queries, the Array would have a length of 8
    var mq, p, i, func, result;

    for (p in vars) {
      i = _media.indexOf(p);
      func = vars[p];
      _creatingMedia = p;

      if (p === "all") {
        func();
      } else {
        mq = _win.matchMedia(p);

        if (mq) {
          mq.matches && (result = func());

          if (~i) {
            _media[i + 1] = _combineFunc(_media[i + 1], func);
            _media[i + 2] = _combineFunc(_media[i + 2], result);
          } else {
            i = _media.length;

            _media.push(p, func, result);

            mq.addListener ? mq.addListener(_onMediaChange) : mq.addEventListener("change", _onMediaChange);
          }

          _media[i + 3] = mq.matches;
        }
      }

      _creatingMedia = 0;
    }

    return _media;
  };

  ScrollTrigger.clearMatchMedia = function clearMatchMedia(query) {
    query || (_media.length = 0);
    query = _media.indexOf(query);
    query >= 0 && _media.splice(query, 4);
  };

  ScrollTrigger.isInViewport = function isInViewport(element, ratio, horizontal) {
    var bounds = (_isString(element) ? _getTarget(element) : element).getBoundingClientRect(),
        offset = bounds[horizontal ? _width : _height] * ratio || 0;
    return horizontal ? bounds.right - offset > 0 && bounds.left + offset < _win.innerWidth : bounds.bottom - offset > 0 && bounds.top + offset < _win.innerHeight;
  };

  ScrollTrigger.positionInViewport = function positionInViewport(element, referencePoint, horizontal) {
    _isString(element) && (element = _getTarget(element));
    var bounds = element.getBoundingClientRect(),
        size = bounds[horizontal ? _width : _height],
        offset = referencePoint == null ? size / 2 : referencePoint in _keywords ? _keywords[referencePoint] * size : ~referencePoint.indexOf("%") ? parseFloat(referencePoint) * size / 100 : parseFloat(referencePoint) || 0;
    return horizontal ? (bounds.left + offset) / _win.innerWidth : (bounds.top + offset) / _win.innerHeight;
  };

  return ScrollTrigger;
}();
ScrollTrigger.version = "3.10.3";

ScrollTrigger.saveStyles = function (targets) {
  return targets ? _toArray(targets).forEach(function (target) {
    // saved styles are recorded in a consecutive alternating Array, like [element, cssText, transform attribute, cache, matchMedia, ...]
    if (target && target.style) {
      var i = _savedStyles.indexOf(target);

      i >= 0 && _savedStyles.splice(i, 5);

      _savedStyles.push(target, target.style.cssText, target.getBBox && target.getAttribute("transform"), gsap.core.getCache(target), _creatingMedia);
    }
  }) : _savedStyles;
};

ScrollTrigger.revert = function (soft, media) {
  return _revertAll(!soft, media);
};

ScrollTrigger.create = function (vars, animation) {
  return new ScrollTrigger(vars, animation);
};

ScrollTrigger.refresh = function (safe) {
  return safe ? _onResize() : (_coreInitted || ScrollTrigger.register()) && _refreshAll(true);
};

ScrollTrigger.update = _updateAll;
ScrollTrigger.clearScrollMemory = _clearScrollMemory;

ScrollTrigger.maxScroll = function (element, horizontal) {
  return _maxScroll(element, horizontal ? _horizontal : _vertical);
};

ScrollTrigger.getScrollFunc = function (element, horizontal) {
  return _getScrollFunc(_getTarget(element), horizontal ? _horizontal : _vertical);
};

ScrollTrigger.getById = function (id) {
  return _ids[id];
};

ScrollTrigger.getAll = function () {
  return _triggers.filter(function (t) {
    return t.vars.id !== "ScrollSmoother";
  });
}; // it's common for people to ScrollTrigger.getAll(t => t.kill()) on page routes, for example, and we don't want it to ruin smooth scrolling by killing the main ScrollSmoother one.


ScrollTrigger.isScrolling = function () {
  return !!_lastScrollTime;
};

ScrollTrigger.snapDirectional = _snapDirectional;

ScrollTrigger.addEventListener = function (type, callback) {
  var a = _listeners[type] || (_listeners[type] = []);
  ~a.indexOf(callback) || a.push(callback);
};

ScrollTrigger.removeEventListener = function (type, callback) {
  var a = _listeners[type],
      i = a && a.indexOf(callback);
  i >= 0 && a.splice(i, 1);
};

ScrollTrigger.batch = function (targets, vars) {
  var result = [],
      varsCopy = {},
      interval = vars.interval || 0.016,
      batchMax = vars.batchMax || 1e9,
      proxyCallback = function proxyCallback(type, callback) {
    var elements = [],
        triggers = [],
        delay = gsap.delayedCall(interval, function () {
      callback(elements, triggers);
      elements = [];
      triggers = [];
    }).pause();
    return function (self) {
      elements.length || delay.restart(true);
      elements.push(self.trigger);
      triggers.push(self);
      batchMax <= elements.length && delay.progress(1);
    };
  },
      p;

  for (p in vars) {
    varsCopy[p] = p.substr(0, 2) === "on" && _isFunction(vars[p]) && p !== "onRefreshInit" ? proxyCallback(p, vars[p]) : vars[p];
  }

  if (_isFunction(batchMax)) {
    batchMax = batchMax();

    _addListener(ScrollTrigger, "refresh", function () {
      return batchMax = vars.batchMax();
    });
  }

  _toArray(targets).forEach(function (target) {
    var config = {};

    for (p in varsCopy) {
      config[p] = varsCopy[p];
    }

    config.trigger = target;
    result.push(ScrollTrigger.create(config));
  });

  return result;
}; // to reduce file size. clamps the scroll and also returns a duration multiplier so that if the scroll gets chopped shorter, the duration gets curtailed as well (otherwise if you're very close to the top of the page, for example, and swipe up really fast, it'll suddenly slow down and take a long time to reach the top).


var _clampScrollAndGetDurationMultiplier = function _clampScrollAndGetDurationMultiplier(scrollFunc, current, end, max) {
  current > max ? scrollFunc(max) : current < 0 && scrollFunc(0);
  return end > max ? (max - current) / (end - current) : end < 0 ? current / (current - end) : 1;
},
    _allowNativePanning = function _allowNativePanning(target, direction) {
  if (direction === true) {
    target.style.removeProperty("touch-action");
  } else {
    target.style.touchAction = direction ? "pan-" + direction : "none"; // note: we tried adding pinch-zoom too, but Firefox doesn't support it properly.
  }

  target === _docEl && _allowNativePanning(_body);
},
    _overflow = {
  auto: 1,
  scroll: 1
},
    _nestedScroll = function _nestedScroll(_ref5) {
  var event = _ref5.event,
      target = _ref5.target,
      axis = _ref5.axis;

  var node = (event.changedTouches ? event.changedTouches[0] : event).target,
      cache = node._gsap || gsap.core.getCache(node),
      time = _getTime(),
      cs;

  if (!cache._isScrollT || time - cache._isScrollT > 2000) {
    // cache for 2 seconds to improve performance.
    while (node && node.scrollHeight <= node.clientHeight) {
      node = node.parentNode;
    }

    cache._isScroll = node && !_isViewport(node) && node !== target && (_overflow[(cs = _getComputedStyle(node)).overflowY] || _overflow[cs.overflowX]);
    cache._isScrollT = time;
  }

  (cache._isScroll || axis === "x") && (event._gsapAllow = true);
},
    // capture events on scrollable elements INSIDE the <body> and allow those by calling stopPropagation() when we find a scrollable ancestor
_inputObserver = function _inputObserver(target, type, inputs, nested) {
  return Observer.create({
    target: target,
    capture: true,
    debounce: false,
    lockAxis: true,
    type: type,
    onWheel: nested = nested && _nestedScroll,
    onPress: nested,
    onDrag: nested,
    onScroll: nested,
    onEnable: function onEnable() {
      return inputs && _addListener(_doc, Observer.eventTypes[0], _captureInputs, false, true);
    },
    onDisable: function onDisable() {
      return _removeListener(_doc, Observer.eventTypes[0], _captureInputs);
    }
  });
},
    _inputExp = /(input|label|select|textarea)/i,
    _inputIsFocused,
    _captureInputs = function _captureInputs(e) {
  var isInput = _inputExp.test(e.target.tagName);

  if (isInput || _inputIsFocused) {
    e._gsapAllow = true;
    _inputIsFocused = isInput;
  }
},
    _getScrollNormalizer = function _getScrollNormalizer(vars) {
  _isObject(vars) || (vars = {});
  vars.preventDefault = vars.isNormalizer = vars.allowClicks = true;
  vars.type || (vars.type = "wheel,touch");
  vars.debounce = !!vars.debounce;
  vars.id = vars.id || "normalizer";

  var _vars2 = vars,
      normalizeScrollX = _vars2.normalizeScrollX,
      momentum = _vars2.momentum,
      allowNestedScroll = _vars2.allowNestedScroll,
      self,
      maxY,
      target = _getTarget(vars.target) || _docEl,
      scrollFuncY = _getScrollFunc(target, _vertical),
      scrollFuncX = _getScrollFunc(target, _horizontal),
      scale = 1,
      wheelRefresh = 0,
      resolveMomentumDuration = _isFunction(momentum) ? function () {
    return momentum(self);
  } : function () {
    return momentum || 2.8;
  },
      skipTouchMove,
      lastRefreshID,
      inputObserver = _inputObserver(target, vars.type, true, allowNestedScroll),
      resumeTouchMove = function resumeTouchMove() {
    return skipTouchMove = false;
  },
      scrollClampX = _passThrough,
      scrollClampY = _passThrough,
      updateClamps = function updateClamps() {
    maxY = _maxScroll(target, _vertical);
    scrollClampY = _clamp(0, maxY);
    normalizeScrollX && (scrollClampX = _clamp(0, _maxScroll(target, _horizontal)));
    lastRefreshID = _refreshID;
  },
      fixIOSBug = ScrollTrigger.isTouch && /(iPad|iPhone|iPod|Mac)/g.test(navigator.userAgent),
      ignoreDrag = function ignoreDrag() {
    if (skipTouchMove) {
      requestAnimationFrame(resumeTouchMove); // we MUST wait for a requestAnimationFrame, otherwise iOS will misreport the value.

      return true;
    }

    skipTouchMove = true;
  },
      tween,
      startScrollX,
      startScrollY,
      onStopDelayedCall,
      onResize = function onResize() {
    // if the window resizes, like on an iPhone which Apple FORCES the address bar to show/hide even if we event.preventDefault(), it may be scrolling too far now that the address bar is showing, so we must dynamically adjust the momentum tween.
    updateClamps();
    tween.isActive() && tween.vars.scrollY > maxY && tween.resetTo("scrollY", _maxScroll(target, _vertical));
  };

  vars.ignoreCheck = function (e) {
    return fixIOSBug && e.type === "touchmove" && ignoreDrag(e) || scale > 1 || self.isGesturing || e.touches && e.touches.length > 1;
  };

  vars.onPress = function () {
    var prevScale = scale;
    scale = _win.visualViewport && _win.visualViewport.scale || 1;
    tween.pause();
    prevScale !== scale && _allowNativePanning(target, scale > 1 ? true : normalizeScrollX ? false : "x");
    skipTouchMove = false;
    startScrollX = scrollFuncX();
    startScrollY = scrollFuncY();
    updateClamps();
    lastRefreshID = _refreshID;
  };

  vars.onRelease = vars.onGestureStart = function (self, wasDragging) {
    if (!wasDragging) {
      onStopDelayedCall.restart(true);
    } else {
      // alternate algorithm: durX = Math.min(6, Math.abs(self.velocityX / 800)),	dur = Math.max(durX, Math.min(6, Math.abs(self.velocityY / 800))); dur = dur * (0.4 + (1 - _power4In(dur / 6)) * 0.6)) * (momentumSpeed || 1)
      var dur = resolveMomentumDuration(),
          currentScroll,
          endScroll;

      if (normalizeScrollX) {
        currentScroll = scrollFuncX();
        endScroll = currentScroll + dur * 0.05 * -self.velocityX / 0.227 / scale; // the constant .227 is from power4(0.05). velocity is inverted because scrolling goes in the opposite direction.

        dur *= _clampScrollAndGetDurationMultiplier(scrollFuncX, currentScroll, endScroll, _maxScroll(target, _horizontal));
        tween.vars.scrollX = scrollClampX(endScroll);
      }

      currentScroll = scrollFuncY();
      endScroll = currentScroll + dur * 0.05 * -self.velocityY / 0.227 / scale; // the constant .227 is from power4(0.05)

      dur *= _clampScrollAndGetDurationMultiplier(scrollFuncY, currentScroll, endScroll, _maxScroll(target, _vertical));
      tween.vars.scrollY = scrollClampY(endScroll);
      tween.invalidate().duration(dur).play(0.01);
    }
  };

  vars.onWheel = function () {
    tween._ts && tween.pause();

    if (_getTime() - wheelRefresh > 1000) {
      // after 1 second, refresh the clamps otherwise that'll only happen when ScrollTrigger.refresh() is called or for touch-scrolling.
      lastRefreshID = 0;
      wheelRefresh = _getTime();
    }
  };

  vars.onChange = function (self, dx, dy, xArray, yArray) {
    _refreshID !== lastRefreshID && updateClamps();
    dx && normalizeScrollX && scrollFuncX(scrollClampX(xArray[2] === dx ? startScrollX + (self.startX - self.x) / scale : scrollFuncX() + dx - xArray[1])); // for more precision, we track pointer/touch movement from the start, otherwise it'll drift.

    dy && scrollFuncY(scrollClampY(yArray[2] === dy ? startScrollY + (self.startY - self.y) / scale : scrollFuncY() + dy - yArray[1]));

    _updateAll();
  };

  vars.onEnable = function () {
    _allowNativePanning(target, normalizeScrollX ? false : "x");

    _addListener(_win, "resize", onResize);

    inputObserver.enable();
  };

  vars.onDisable = function () {
    _allowNativePanning(target, true);

    _removeListener(_win, "resize", onResize);

    inputObserver.kill();
  };

  self = new Observer(vars);
  onStopDelayedCall = self._dc;
  tween = gsap.to(self, {
    ease: "power4",
    paused: true,
    scrollX: normalizeScrollX ? "+=0.1" : "+=0",
    scrollY: "+=0.1",
    onComplete: onStopDelayedCall.vars.onComplete
  });
  return self;
};

ScrollTrigger.sort = function (func) {
  return _triggers.sort(func || function (a, b) {
    return (a.vars.refreshPriority || 0) * -1e6 + a.start - (b.start + (b.vars.refreshPriority || 0) * -1e6);
  });
};

ScrollTrigger.observe = function (vars) {
  return new Observer(vars);
};

ScrollTrigger.normalizeScroll = function (vars) {
  if (typeof vars === "undefined") {
    return _normalizer;
  }

  if (vars === true && _normalizer) {
    return _normalizer.enable();
  }

  if (vars === false) {
    return _normalizer && _normalizer.kill();
  }

  var normalizer = vars instanceof Observer ? vars : _getScrollNormalizer(vars);
  _normalizer && _normalizer.target === normalizer.target && _normalizer.kill();
  _isViewport(normalizer.target) && (_normalizer = normalizer);
  return normalizer;
};

ScrollTrigger.core = {
  // smaller file size way to leverage in ScrollSmoother and Observer
  _getVelocityProp: _getVelocityProp,
  _inputObserver: _inputObserver,
  _scrollers: _scrollers,
  _proxies: _proxies,
  bridge: {
    // when normalizeScroll sets the scroll position (ss = setScroll)
    ss: function ss() {
      _lastScrollTime || _dispatch("scrollStart");
      _lastScrollTime = _getTime();
    },
    // a way to get the _refreshing value in Observer
    ref: function ref() {
      return _refreshing;
    }
  }
};
_getGSAP() && gsap.registerPlugin(ScrollTrigger);
export { ScrollTrigger as default };