// JavaScript Document
var $ = function (id) {
	return "string" == typeof id ? document.getElementById(id) : id;
};
var Class = {
  create: function() {
	return function() {
	  this.initialize.apply(this, arguments);
	}
  }
}
Object.extend = function(destination, source) {
	for (var property in source) {
		destination[property] = source[property];
	}
	return destination;
}
var TransformView = Class.create();
TransformView.prototype = {
  initialize: function(container, slider, parameter, count, options) {
	if(parameter <= 0 || count <= 0) return;
	var oContainer = $(container), oSlider = $(slider), oThis = this;
	this.Index = 0;
	this._timer = null;
	this._slider = oSlider;
	this._parameter = parameter;
	this._count = count || 0;
	this._target = 0;
	this.SetOptions(options);
	this.Up = !!this.options.Up;
	this.Step = Math.abs(this.options.Step);
	this.Time = Math.abs(this.options.Time);
	this.Auto = !!this.options.Auto;
	this.Pause = Math.abs(this.options.Pause);
	this.onStart = this.options.onStart;
	this.onFinish = this.options.onFinish;
	
	oContainer.style.overflow = "hidden";
	oContainer.style.position = "relative";
	
	oSlider.style.position = "absolute";
	oSlider.style.top = oSlider.style.left = 0;
  },
  SetOptions: function(options) {
	this.options = {
		Up:			true,
		Step:		5,
		Time:		10,
		Auto:		true,
		Pause:		2000,
		onStart:	function(){},
		onFinish:	function(){}
	};
	Object.extend(this.options, options || {});
  },
  Start: function() {
	if(this.Index < 0){
		this.Index = this._count - 1;
	} else if (this.Index >= this._count){ this.Index = 0; }
	
	this._target = -1 * this._parameter * this.Index;
	this.onStart();
	this.Move();
  },
  Move: function() {
	clearTimeout(this._timer);
	var oThis = this, style = this.Up ? "top" : "left", iNow = parseInt(this._slider.style[style]) || 0, iStep = this.GetStep(this._target, iNow);
	if (iStep != 0) {
		this._slider.style[style] = (iNow + iStep) + "px";
		this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);
	} else {
		this._slider.style[style] = this._target + "px";
		this.onFinish();
		if (this.Auto) { this._timer = setTimeout(function(){ oThis.Index++; oThis.Start(); }, this.Pause); }
	}
  },
  GetStep: function(iTarget, iNow) {
	var iStep = (iTarget - iNow) / this.Step;
	if (iStep == 0) return 0;
	if (Math.abs(iStep) < 1) return (iStep > 0 ? 1 : -1);
	return iStep;
  },
  Stop: function(iTarget, iNow) {
	clearTimeout(this._timer);
	this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
  }
};

function next(elem){    
	do{    
		elem=elem.nextSibling;    
	}while(elem&&elem.nodeType!=1);    
	return elem;    
}    
//---查找第一个子元素的函数---//    
function first(elem){    
	elem=elem.firstChild;    
	return elem && elem.nodeType!=1?next(elem):elem;    
}

var Marquee = {
	init : function(id,toFollow,speed){
		this.speed = speed || 10;
		this.boxID = id;
		this.toFollow=toFollow;
		this.scrollBox = document.getElementById(id);
		
		
		if(this.toFollow=="top"||this.toFollow=="bottom"){
			this.appendBox=first(this.scrollBox).cloneNode(true);
			this.scrollBox.appendChild(this.appendBox);
		}else{
			var templateLeft = "<table cellspacing='0' cellpadding='0' style='border-collapse:collapse;display:inline;'><tr><td noWrap=true style='white-space: nowrap;word-break:keep-all;'>"+this.scrollBox.innerHTML+"</td><td noWrap=true style='white-space: nowrap;word-break:keep-all;'>"+this.scrollBox.innerHTML+"</td></tr></table>";
			this.scrollBox.innerHTML=templateLeft;
			this.appendBox=first(first(first(first(this.scrollBox))));
			
		}
		this.objs = {
			scrollBox : this.scrollBox,
			appendBox : this.appendBox,
			toFollow : this.toFollow,
			speed : this.speed,
			id : this.boxID
		};
		return this;
	},

	scrollUp : function(){
		var self = this.objs;
		self.begin = function(){
			
			if(self['toFollow']=="top"){
				self.doScr = setInterval(function(){
					if(self['appendBox'].offsetHeight<=self['scrollBox'].scrollTop){
						self['scrollBox'].scrollTop-=first(self['scrollBox']).offsetHeight;
					}else{
						self['scrollBox'].scrollTop++;
					}
				},self.speed);
			}else if(self['toFollow']=="bottom"){
			self.doScr = setInterval(function(){
				if(self['scrollBox'].scrollTop<=0){
					self['scrollBox'].scrollTop=self['appendBox'].offsetHeight;
				}else{
					self['scrollBox'].scrollTop--;
				}
			},self.speed);
		}else if(self['toFollow']=="left"){
			self.doScr = setInterval(function(){
				if(self['appendBox'].offsetWidth<=self['scrollBox'].scrollLeft){
					self['scrollBox'].scrollLeft-=self['appendBox'].offsetWidth;
				}else{
					self['scrollBox'].scrollLeft++;
				}
			},self.speed);
		}else if(self['toFollow']=="right"){
			self.doScr = setInterval(function(){
				if(self['scrollBox'].scrollLeft<=0){
					self['scrollBox'].scrollLeft=self['appendBox'].offsetWidth;
				}else{
					self['scrollBox'].scrollLeft--;
				}
				
			},self.speed);
			
		}
		}
		self.begin();
		self.scrollBox.onmouseover = function(){
			clearInterval(self.doScr);
		}

		self.scrollBox.onmouseout = function(){
			self.begin();
		}
	}

}