Function _parsePosition

esm/ScrollTrigger.js:738–808

(value, trigger, scrollerSize, direction, scroll, marker, markerScroller, self, scrollerBounds, borderWidth, useFixedPosition, scrollerMax, containerAnimation, clampZeroProp)

// 	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, clampZeroProp) {
  _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);
  isNaN(value) || (value = +value); // convert a string number like "45" to an actual number

  if (!_isNumber(value)) {
    _isFunction(trigger) && (trigger = trigger(self));
    var offsets = (value || "0").split(" "),
        bounds,
        localOffset,
        globalOffset,
        display;
    element = _getTarget(trigger, self) || _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 {
    containerAnimation && (value = gsap.utils.mapRange(containerAnimation.scrollTrigger.start, containerAnimation.scrollTrigger.end, 0, scrollerMax, value));
    markerScroller && _positionMarker(markerScroller, scrollerSize, direction, true);
  }

  if (clampZeroProp) {
    self[clampZeroProp] = value || -0.001;
    value < 0 && (value = 0);
  }

  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);
    }