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编辑当前文件:/home/qrafawbu/rentandbuyrealty.com/mobile/lib/gsap/src/uncompressed/plugins/ScrollToPlugin.js

/*!
 * VERSION: 1.7.3
 * DATE: 2014-01-14
 * UPDATES AND DOCS AT: http://www.greensock.com
 *
 * @license Copyright (c) 2008-2014, GreenSock. All rights reserved.
 * This work is subject to the terms at http://www.greensock.com/terms_of_use.html or for
 * Club GreenSock members, the software agreement that was issued with your membership.
 * 
 * @author: Jack Doyle, jack@greensock.com
 **/
(window._gsQueue || (window._gsQueue = [])).push( function() {

"use strict";

var _doc = document.documentElement,
		_window = window,
		_max = function(element, axis) {
			var dim = (axis === "x") ? "Width" : "Height",
				scroll = "scroll" + dim,
				client = "client" + dim,
				body = document.body;
			return (element === _window || element === _doc || element === body) ? Math.max(_doc[scroll], body[scroll]) - (_window["inner" + dim] || Math.max(_doc[client], body[client])) : element[scroll] - element["offset" + dim];
		},

ScrollToPlugin = window._gsDefine.plugin({
			propName: "scrollTo",
			API: 2,
			version:"1.7.3",

//called when the tween renders for the first time. This is where initial values should be recorded and any setup routines should run.
			init: function(target, value, tween) {
				this._wdw = (target === _window);
				this._target = target;
				this._tween = tween;
				if (typeof(value) !== "object") {
					value = {y:value}; //if we don't receive an object as the parameter, assume the user intends "y".
				}
				this._autoKill = (value.autoKill !== false);
				this.x = this.xPrev = this.getX();
				this.y = this.yPrev = this.getY();
				if (value.x != null) {
					this._addTween(this, "x", this.x, (value.x === "max") ? _max(target, "x") : value.x, "scrollTo_x", true);
					this._overwriteProps.push("scrollTo_x");
				} else {
					this.skipX = true;
				}
				if (value.y != null) {
					this._addTween(this, "y", this.y, (value.y === "max") ? _max(target, "y") : value.y, "scrollTo_y", true);
					this._overwriteProps.push("scrollTo_y");
				} else {
					this.skipY = true;
				}
				return true;
			},

//called each time the values should be updated, and the ratio gets passed as the only parameter (typically it's a value between 0 and 1, but it can exceed those when using an ease like Elastic.easeOut or Back.easeOut, etc.)
			set: function(v) {
				this._super.setRatio.call(this, v);

var x = (this._wdw || !this.skipX) ? this.getX() : this.xPrev,
					y = (this._wdw || !this.skipY) ? this.getY() : this.yPrev,
					yDif = y - this.yPrev,
					xDif = x - this.xPrev;

if (this._autoKill) {
					//note: iOS has a bug that throws off the scroll by several pixels, so we need to check if it's within 7 pixels of the previous one that we set instead of just looking for an exact match.
					if (!this.skipX && (xDif > 7 || xDif < -7) && x < _max(this._target, "x")) {
						this.skipX = true; //if the user scrolls separately, we should stop tweening!
					}
					if (!this.skipY && (yDif > 7 || yDif < -7) && y < _max(this._target, "y")) {
						this.skipY = true; //if the user scrolls separately, we should stop tweening!
					}
					if (this.skipX && this.skipY) {
						this._tween.kill();
					}
				}
				if (this._wdw) {
					_window.scrollTo((!this.skipX) ? this.x : x, (!this.skipY) ? this.y : y);
				} else {
					if (!this.skipY) {
						this._target.scrollTop = this.y;
					}
					if (!this.skipX) {
						this._target.scrollLeft = this.x;
					}
				}
				this.xPrev = this.x;
				this.yPrev = this.y;
			}

}),
		p = ScrollToPlugin.prototype;

ScrollToPlugin.max = _max;

p.getX = function() {
		return (!this._wdw) ? this._target.scrollLeft : (_window.pageXOffset != null) ? _window.pageXOffset : (_doc.scrollLeft != null) ? _doc.scrollLeft : document.body.scrollLeft;
	};

p.getY = function() {
		return (!this._wdw) ? this._target.scrollTop : (_window.pageYOffset != null) ? _window.pageYOffset : (_doc.scrollTop != null) ? _doc.scrollTop : document.body.scrollTop;
	};

p._kill = function(lookup) {
		if (lookup.scrollTo_x) {
			this.skipX = true;
		}
		if (lookup.scrollTo_y) {
			this.skipY = true;
		}
		return this._super._kill.call(this, lookup);
	};

}); if (window._gsDefine) { window._gsQueue.pop()(); }