/*
author:
-------*netsnower(设计)
-------*jin.dh(前端)
date:
-------*2012/4
*/
	//tool
	//获取窗口
	function getw() {
		var client_h, client_w, scrolltop;
		client_h = document.documentelement.clientheight || document.body.clientheight;
		client_w = document.documentelement.clientwidth || document.body.clientwidth;
		scrolltop = document.documentelement.scrolltop || document.body.scrolltop;
		return o = {
			w: client_w,
			h: client_h,
			s: scrolltop
		};
	}
	
	
	//创建标签
	function $c(tag){
		return document.createelement(tag||"div");
	};

	//添加dom
	function $d(tag,css,father){
		if(!tag || !css)return;
		var tag = $c(tag);
		if(css){
			setstyle(tag,css);
		};
		father = father || document.body;
		father.appendchild(tag);
		return tag;
	}

	//获取css
	function getstyles(ele) {
		var style;
		if (document.defaultview && document.defaultview.getcomputedstyle) style = document.defaultview.getcomputedstyle(ele, null);
		else style = ele.currentstyle;
		return style;
	};

	//获取对象
	function g(id) {
		if (!id) return;
		return (typeof id == "string" ? document.getelementbyid(id) : id);
	}

	//设置样式
	function setstyle(ele, css) {
		if (!ele) return;
		var x, y, z, m;
		z = ele;
		x = z.style;
		for (var s in css) {
			m = css[s];
			y = m + "px";
			switch (s) {
			case "w":x.width = y;		break;
			case "h":x.height = y;		break;
			case "l":x.left = y;		break;
			case "t":x.top = y; 		break;
			case "z":x.zindex = m; 		break;
			case "a":x.position = m;	break;
			case "d":x.display = m;		break;
			case "i":z.innerhtml = m;	break;
			case "bg":x.background = m;	break;
			case "b":x.border = m;		break;
			case "d":x.display = m;		break;
			case "m":x.margin = m;		break;
			case "p":x.padding = m;		break;
			case "rotate" :
				x["moztransform"]     = "rotate("+m+"deg)";
				x["otransform"]       = "rotate("+m+"deg)";
				x["webkittransform"]  = "rotate("+m+"deg)";
				break;
			default:
				x[s] = m;
				break;
			};

		};
	};

	//事件处理
	var eventutil = {
		addhandler: function(ele, type, handler) { //绑定事件
			var list = {
				a: ["addeventlistener", "attachevent"],
				r: ["removeeventlistener", "datachevent"]
			};
			var name = arguments[3] === true ? list["r"] : list["a"];

		if (ele[name[0]]) {
			ele[name[0]](type, handler, false)
			} else if (ele.attachevent) {
				ele[name[1]]("on" + type, handler);
			} else {
			var handler = arguments[3] === true ? handler: null;
			ele["on" + type] = handler;
		}
		},
		removehandler: function(ele, type, handler) { //删除绑定
			this.addhandler(ele, type, handler, true);
		},
		getevent: function(event) { //获取事件对象
			return event ? event: window.event;
		},
		gettarget: function(event) { //获取正在处理发生事件的对象
			return event.target || event.srcelement;
		},
		stoppropagation: function(event) { //阻止冒泡
			if (event.stoppropagation) {
				event.stoppropagation();
			} else {
				event.cancelbubble = true;
			}
		},
		preventdefalut: function(event) { //阻止默认行为
			if (event.preventdefalut) {
				event.preventdefault();
			} else {
				event.returnvalue = false;
			}
		},
		getrelatedtarget: function(event) { //获取当前目标(mouseover or mouseout)的时候有效
			if (event.getrelatedtarget) {
				return event.getrelatedtarget;
			} else if (event.toelement) {
				return event.toelement;
			} else if (event.fromelement) {
				return event.fromelement;
			} else {
				return null;
			}
		},
		addload: function(fun) { //window.onload处理
			var nowload = window.onload;
			if (typeof nowload != "function") {
				window.onload = fun;
			} else {
				window.onload = function() {
					nowload();
					fun();
				};
			};
		},
		getwheeldelta:function(event){ //获取滑轮方向			
			if(event.wheeldelta){
				return event.wheeldelta;
			}else{
				return -event.detail * 40;
			}
	}
};

//dom           

//滚动类
	var bodyscroll = {
		init: function() {			
			var that = this;		
			this.wrapbox = g("wrapbox");			
			this.wrap = g("wrap");
			this.scrolltool = g("scrolltool");	
			
			if(this.wrapbox.offsetheight>=this.wrap.offsetheight){
				this.scrolltool.style.display = "none";
				return false;
			};			
						
			eventutil.addhandler(that.scrolltool,"mousedown",function(e){
				var e = eventutil.getevent(e);
				that.scrolltool.lasty = e.clienty - that.scrolltool.offsettop;			
				that.scrolltool.down = true;
			
				
				//设置拖动必备条件
				setmove(that.scrolltool,e);
				document.onmousemove = function(e){
					var e = eventutil.getevent(e);
					var post =  e.clienty -that.scrolltool.lasty;
					if(post<=0){
						post = 0;	
					}else if(post>=that.maxscrollt){
						post = that.maxscrollt;
					};				
					setstyle(that.scrolltool, {t:post});
					that.scrollmove();				
				};
				
				document.onmouseup = function(){
					that.scrolltool.stop();
				}
			});		
			
			eventutil.addhandler(this.wrapbox, "mousewheel", function (e) {
				var e = eventutil.getevent(e);
				that.wheelscroll(e);
				if (e && e.preventdefault) {
				  e.preventdefault();
				  e.stoppropagation();
				} else {
				  e.returnvalue = false;
				  return false;
				}
			  });
			//ff兼容
			  eventutil.addhandler(this.wrapbox, "dommousescroll", function (e) {
				var e = eventutil.getevent(e);
				that.wheelscroll(e);
				if (e && e.preventdefault) {
				  e.preventdefault();
				  e.stoppropagation();
				} else {
				  e.returnvalue = false;
				  return false;
				}
			  });
		
		that.resizetimer = 0;		
		that.wrapttimer = null;
		that.getdata();
		
	},
	getdata:function(){
		var that = this;
			var client = getw();				
			this.wraph = this.wrap.offsetheight;
			this.scrolltoolh =this.scrolltool.offsetheight;
			
			
			that.maxscrollt = this.wrapbox.offsetheight - that.scrolltoolh;
			//滚动比例
			
			this.scrollscale = (this.wraph - this.wrapbox.offsetheight)/that.maxscrollt;						
			this.toolt = that.scrolltool.offsettop;	
			
		},
		wheelscroll:function(e){
			var that = this;
			var e = eventutil.getevent(e);
			var wheeldelta = eventutil.getwheeldelta(e);
			var nowtoolt = that.scrolltool.offsettop;		
			if(wheeldelta>0){
				nowtoolt-=15;	
			}else if(wheeldelta<0){
				nowtoolt+=15;	
			};

			if(nowtoolt<=0){
				nowtoolt = 0;
			};		
			if(nowtoolt >= that.maxscrollt){
				nowtoolt = that.maxscrollt;
			};
			setstyle(that.scrolltool, {
				t: nowtoolt
			});
			that.scrollmove();
		},
		move: function(num){
			var that = this;
			var tnum = num;
			var b,t_b;
			clearinterval(that.movetimer);
			if(arguments.length===2){	
				 var post = tnum/that.scrollscale;
				 clearinterval(that.movescrolltimer);
				 that.movescrolltimer = setinterval(function() {
					//滚动条
					t_b = math.floor(math.abs(parseint(getstyles(that.scrolltool).top)));
					t_b += (post - t_b) / 5;
					if (math.abs((math.abs(t_b)-math.abs(post)))<4) {
						t_b = post;
						clearinterval(that.movescrolltimer);
					};

					setstyle(that.scrolltool, {
						t: t_b
					});					

					//内容
					b = math.floor(math.abs(parseint(getstyles(that.wrap).top)));
					b += math.floor((tnum - b) /5);
					if (math.abs((math.abs(b)-math.abs(tnum)))<5) {
						b = tnum;
						clearinterval(that.movetimer);
					};

					//showmsg(b);
					setstyle(that.wrap, {
						t: -b
					});
				},
				30);
			}else{
				setstyle(that.wrap, {
						t: -tnum
				});
			};

		},

		scrollmove:function(){
			var that = this;
			that.toolt = that.scrolltool.offsettop;	
			var post = math.floor(that.toolt*that.scrollscale);			
				that.move(post);			
		}
	};



	
	
	//拖拽必备条件(清除焦点，设置鼠标范围,obj为拖动对象，event为事件对象)。
	function setmove(obj,event){
		//清除选择
		 window.getselection ? window.getselection().removeallranges() : document.selection.empty();
		 if(document.all){ //is ie
			//焦点丢失
			obj.onlosecapture = function(){obj.stop();}
			//设置鼠标捕获
			obj.setcapture();
		}else{
			//焦点丢失
			window.onblur =function(){obj.stop();}
			//阻止默认动作
			
			event.preventdefault();
		};
		obj.stop = function(){
			if(obj.releasecapture){
				obj.releasecapture();
			};
			document.onmousemove = null;
			document.onmouseup = null;
			window.onblur = null;
		}
	
	}