gsap/dist/ScrollToPlugin.js

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

	/*!
	 * ScrollToPlugin 3.5.1
	 * https://greensock.com
	 *
	 * @license Copyright 2008-2020, 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
	*/
	var gsap,
	    _coreInitted,
	    _window,
	    _docEl,
	    _body,
	    _toArray,
	    _config,
	    _windowExists = function _windowExists() {
	  return typeof window !== "undefined";
	},
	    _getGSAP = function _getGSAP() {
	  return gsap || _windowExists() && (gsap = window.gsap) && gsap.registerPlugin && gsap;
	},
	    _isString = function _isString(value) {
	  return typeof value === "string";
	},
	    _max = function _max(element, axis) {
	  var dim = axis === "x" ? "Width" : "Height",
	      scroll = "scroll" + dim,
	      client = "client" + dim;
	  return element === _window || element === _docEl || element === _body ? Math.max(_docEl[scroll], _body[scroll]) - (_window["inner" + dim] || _docEl[client] || _body[client]) : element[scroll] - element["offset" + dim];
	},
	    _buildGetter = function _buildGetter(e, axis) {
	  var p = "scroll" + (axis === "x" ? "Left" : "Top");

	  if (e === _window) {
	    if (e.pageXOffset != null) {
	      p = "page" + axis.toUpperCase() + "Offset";
	    } else {
	      e = _docEl[p] != null ? _docEl : _body;
	    }
	  }

	  return function () {
	    return e[p];
	  };
	},
	    _getOffset = function _getOffset(element, container) {
	  var rect = _toArray(element)[0].getBoundingClientRect(),
	      isRoot = !container || container === _window || container === _body,
	      cRect = isRoot ? {
	    top: _docEl.clientTop - (_window.pageYOffset || _docEl.scrollTop || _body.scrollTop || 0),
	    left: _docEl.clientLeft - (_window.pageXOffset || _docEl.scrollLeft || _body.scrollLeft || 0)
	  } : container.getBoundingClientRect(),
	      offsets = {
	    x: rect.left - cRect.left,
	    y: rect.top - cRect.top
	  };

	  if (!isRoot && container) {
	    offsets.x += _buildGetter(container, "x")();
	    offsets.y += _buildGetter(container, "y")();
	  }

	  return offsets;
	},
	    _parseVal = function _parseVal(value, target, axis, currentVal, offset) {
	  return !isNaN(value) && typeof value !== "object" ? parseFloat(value) - offset : _isString(value) && value.charAt(1) === "=" ? parseFloat(value.substr(2)) * (value.charAt(0) === "-" ? -1 : 1) + currentVal - offset : value === "max" ? _max(target, axis) - offset : Math.min(_max(target, axis), _getOffset(value, target)[axis] - offset);
	},
	    _initCore = function _initCore() {
	  gsap = _getGSAP();

	  if (_windowExists() && gsap && document.body) {
	    _window = window;
	    _body = document.body;
	    _docEl = document.documentElement;
	    _toArray = gsap.utils.toArray;
	    gsap.config({
	      autoKillThreshold: 7
	    });
	    _config = gsap.config();
	    _coreInitted = 1;
	  }
	};

	var ScrollToPlugin = {
	  version: "3.5.1",
	  name: "scrollTo",
	  rawVars: 1,
	  register: function register(core) {
	    gsap = core;

	    _initCore();
	  },
	  init: function init(target, value, tween, index, targets) {
	    if (!_coreInitted) {
	      _initCore();
	    }

	    var data = this;
	    data.isWin = target === _window;
	    data.target = target;
	    data.tween = tween;

	    if (typeof value !== "object") {
	      value = {
	        y: value
	      };

	      if (_isString(value.y) && value.y !== "max" && value.y.charAt(1) !== "=") {
	        value.x = value.y;
	      }
	    } else if (value.nodeType) {
	      value = {
	        y: value,
	        x: value
	      };
	    }

	    data.vars = value;
	    data.autoKill = !!value.autoKill;
	    data.getX = _buildGetter(target, "x");
	    data.getY = _buildGetter(target, "y");
	    data.x = data.xPrev = data.getX();
	    data.y = data.yPrev = data.getY();

	    if (value.x != null) {
	      data.add(data, "x", data.x, _parseVal(value.x, target, "x", data.x, value.offsetX || 0), index, targets, Math.round);

	      data._props.push("scrollTo_x");
	    } else {
	      data.skipX = 1;
	    }

	    if (value.y != null) {
	      data.add(data, "y", data.y, _parseVal(value.y, target, "y", data.y, value.offsetY || 0), index, targets, Math.round);

	      data._props.push("scrollTo_y");
	    } else {
	      data.skipY = 1;
	    }
	  },
	  render: function render(ratio, data) {
	    var pt = data._pt,
	        target = data.target,
	        tween = data.tween,
	        autoKill = data.autoKill,
	        xPrev = data.xPrev,
	        yPrev = data.yPrev,
	        isWin = data.isWin,
	        x,
	        y,
	        yDif,
	        xDif,
	        threshold;

	    while (pt) {
	      pt.r(ratio, pt.d);
	      pt = pt._next;
	    }

	    x = isWin || !data.skipX ? data.getX() : xPrev;
	    y = isWin || !data.skipY ? data.getY() : yPrev;
	    yDif = y - yPrev;
	    xDif = x - xPrev;
	    threshold = _config.autoKillThreshold;

	    if (data.x < 0) {
	      data.x = 0;
	    }

	    if (data.y < 0) {
	      data.y = 0;
	    }

	    if (autoKill) {
	      if (!data.skipX && (xDif > threshold || xDif < -threshold) && x < _max(target, "x")) {
	        data.skipX = 1;
	      }

	      if (!data.skipY && (yDif > threshold || yDif < -threshold) && y < _max(target, "y")) {
	        data.skipY = 1;
	      }

	      if (data.skipX && data.skipY) {
	        tween.kill();

	        if (data.vars.onAutoKill) {
	          data.vars.onAutoKill.apply(tween, data.vars.onAutoKillParams || []);
	        }
	      }
	    }

	    if (isWin) {
	      _window.scrollTo(!data.skipX ? data.x : x, !data.skipY ? data.y : y);
	    } else {
	      if (!data.skipY) {
	        target.scrollTop = data.y;
	      }

	      if (!data.skipX) {
	        target.scrollLeft = data.x;
	      }
	    }

	    data.xPrev = data.x;
	    data.yPrev = data.y;
	  },
	  kill: function kill(property) {
	    var both = property === "scrollTo";

	    if (both || property === "scrollTo_x") {
	      this.skipX = 1;
	    }

	    if (both || property === "scrollTo_y") {
	      this.skipY = 1;
	    }
	  }
	};
	ScrollToPlugin.max = _max;
	ScrollToPlugin.getOffset = _getOffset;
	ScrollToPlugin.buildGetter = _buildGetter;
	_getGSAP() && gsap.registerPlugin(ScrollToPlugin);

	exports.ScrollToPlugin = ScrollToPlugin;
	exports.default = ScrollToPlugin;

	Object.defineProperty(exports, '__esModule', { value: true });

})));