/**
 *
 * copyright (c) 2009 may(qq104010230)
 * http://www.winwill.com
 * http://www.winwill.com/jquery/jscroll.html
 * admin@winwill.com
 */
/*--------------------------------------------------------------------------------------------------*/
$.fn.extend({//��ӹ����¼�//by jun
	mousewheel:function(func){
		return this.each(function(){
			var _self = this;
		    _self.d = 0;//��������
			if($.browser.msie||$.browser.safari){
			   _self.onmousewheel=function(){_self.d = event.wheeldelta;event.returnvalue = false;func && func.call(_self);};
			}else{
			   _self.addeventlistener("dommousescroll",function(e){
					_self.d = e.detail>0?-1:1;
					e.preventdefault();
					func && func.call(_self);
			   },false); 
			}
		});
	}
});
$.fn.extend({
	jscroll:function(j){
		return this.each(function(){
			j = j || {}
			j.bar = j.bar||{};//2������
			j.btn = j.btn||{};//2������
			j.bar.bg = j.bar.bg||{};//3������
			j.bar.bd = j.bar.bd||{};//3������
			j.btn.ubg = j.btn.ubg||{};//3������
			j.btn.dbg = j.btn.dbg||{};//3������
			var dw , dh;
			var jun = { w:"15px"
						,bgurl:""
						,bg:"#efefef"
						,bar:{  pos:"up"
								,bd:{out:"#b5b5b5",hover:"#ccc"}
								,bg:{out:"#fff",hover:"#fff",focus:"orange"}}
						,btn:{  btn:true
								,ubg:{out:"#ccc",hover:"#fff",focus:"orange"}
								,dbg:{out:"#ccc",hover:"#fff",focus:"orange"}}
						,fn:function(){}
						,rsize:function(){
							var _self = this;
							dw = $(_self).width(), dh = $(_self).height()-1;
						}
					}
			j.w = j.w||jun.w;
			j.bgurl = j.bgurl||jun.bgurl;
			j.bg = j.bg||jun.bg;
				j.bar.pos = j.bar.pos||jun.bar.pos;
					j.bar.bd.out = j.bar.bd.out||jun.bar.bd.out;
					j.bar.bd.hover = j.bar.bd.hover||jun.bar.bd.hover;
					j.bar.bg.out = j.bar.bg.out||jun.bar.bg.out;
					j.bar.bg.hover = j.bar.bg.hover||jun.bar.bg.hover;
					j.bar.bg.focus = j.bar.bg.focus||jun.bar.bg.focus;
				j.btn.btn = j.btn.btn!=undefined?j.btn.btn:jun.btn.btn;
					j.btn.ubg.out = j.btn.ubg.out||jun.btn.ubg.out;
					j.btn.ubg.hover = j.btn.ubg.hover||jun.btn.ubg.hover;
					j.btn.ubg.focus = j.btn.ubg.focus||jun.btn.ubg.focus;
					j.btn.dbg.out = j.btn.dbg.out||jun.btn.dbg.out;
					j.btn.dbg.hover = j.btn.dbg.hover||jun.btn.dbg.hover;
					j.btn.dbg.focus = j.btn.dbg.focus||jun.btn.dbg.focus;
			j.fn = j.fn||jun.fn;
			j.rsize = j.rsize||jun.rsize;
			var _self = this;
			var stime,sp=0,isup=0;
			$(_self).css({overflow:"hidden",position:"relative",padding:"0px"});
			dw = $(_self).width(), dh = $(_self).height()-1;
			var sw = j.w ? parseint(j.w) : 21;
			var sl = dw - sw
			var bw = j.btn.btn==true ? sw : 0;
			if($(_self).children(".jscroll-c").height()==null){//�����լ��
		$(_self).wrapinner("<div class='jscroll-c' style='top:0px;z-index:9999;zoom:1;position:relative'></div>");
			$(_self).children(".jscroll-c").prepend("<div style='height:0px;overflow:hidden'></div>");
			$(_self).append("<div class='jscroll-e' unselectable='on' style=' height:100%;top:0px;right:0;-moz-user-select:none;position:absolute;overflow:hidden;z-index:10000;'><div class='jscroll-u' style='position:absolute;top:0px;width:100%;left:0;background:blue;overflow:hidden'></div><div class='jscroll-h'  unselectable='on' style='background:green;position:absolute;left:0;-moz-user-select:none;border:1px solid'></div><div class='jscroll-d' style='position:absolute;bottom:0px;width:100%;left:0;background:blue;overflow:hidden'></div></div>");
			}
			var jscrollc = $(_self).children(".jscroll-c");
			var jscrolle = $(_self).children(".jscroll-e");
			var jscrollh = jscrolle.children(".jscroll-h");
			var jscrollu = jscrolle.children(".jscroll-u");
			var jscrolld = jscrolle.children(".jscroll-d");
			if($.browser.msie){document.execcommand("backgroundimagecache", false, true);}
			jscrollc.css({"padding-right":sw});
			jscrolle.css({width:sw,background:j.bg,"background-image":j.bgurl});
			jscrollh.css({top:bw,background:j.bar.bg.out,"background-image":j.bgurl,"border-color":j.bar.bd.out,width:sw-2});
			jscrollu.css({height:bw,background:j.btn.ubg.out,"background-image":j.bgurl});
			jscrolld.css({height:bw,background:j.btn.dbg.out,"background-image":j.bgurl});
			jscrollh.hover(function(){if(isup==0)$(this).css({background:j.bar.bg.hover,"background-image":j.bgurl,"border-color":j.bar.bd.hover})},function(){if(isup==0)$(this).css({background:j.bar.bg.out,"background-image":j.bgurl,"border-color":j.bar.bd.out})})
			jscrollu.hover(function(){if(isup==0)$(this).css({background:j.btn.ubg.hover,"background-image":j.bgurl})},function(){if(isup==0)$(this).css({background:j.btn.ubg.out,"background-image":j.bgurl})})
			jscrolld.hover(function(){if(isup==0)$(this).css({background:j.btn.dbg.hover,"background-image":j.bgurl})},function(){if(isup==0)$(this).css({background:j.btn.dbg.out,"background-image":j.bgurl})})
			var sch = jscrollc.height();
			//var sh = math.pow(dh,2) / sch ;//math.pow(x,y)x��y�η�
			var sh = (dh-2*bw)*dh / sch
			if(sh<10){sh=10}
			var wh = sh/6//����ʱ����������
		//	sh = parseint(sh);
			var curt = 0,allows=false;
			jscrollh.height(sh);
			if(sch<=dh){jscrollc.css({padding:0});jscrolle.css({display:"none"})}else{allows=true;}
			if(j.bar.pos!="up"){
			curt=dh-sh-bw;
			sett();
			}
			jscrollh.bind("mousedown",function(e){
				j['fn'] && j['fn'].call(_self);
				isup=1;
				jscrollh.css({background:j.bar.bg.focus,"background-image":j.bgurl})
				var pagey = e.pagey ,t = parseint($(this).css("top"));
				$(document).mousemove(function(e2){
					 curt =t+ e2.pagey - pagey;//pagey����������������λ�ã�screeny��ļ�����������λ��
						sett();
				});
				$(document).mouseup(function(){
					isup=0;
					jscrollh.css({background:j.bar.bg.out,"background-image":j.bgurl,"border-color":j.bar.bd.out})
					$(document).unbind('mouseup');
					$(document).unbind('mousemove');
				});
				return false;
			});
			jscrollu.bind("mousedown",function(e){
			j['fn'] && j['fn'].call(_self);
				isup=1;
				jscrollu.css({background:j.btn.ubg.focus,"background-image":j.bgurl})
				_self.timesett("u");
				$(document).mouseup(function(){
					isup=0;
					jscrollu.css({background:j.btn.ubg.out,"background-image":j.bgurl})
					$(document).unbind('mouseup');
					cleartimeout(stime);
					sp=0;
				});
				return false;
			});
			jscrolld.bind("mousedown",function(e){
			j['fn'] && j['fn'].call(_self);
				isup=1;
				jscrolld.css({background:j.btn.dbg.focus,"background-image":j.bgurl})
				_self.timesett("d");
				$(document).mouseup(function(){
					isup=0;
					jscrolld.css({background:j.btn.dbg.out,"background-image":j.bgurl})
					$(document).unbind('mouseup');
					cleartimeout(stime);
					sp=0;
				});
				return false;
			});
			_self.timesett = function(d){
				var self=this;
				if(d=="u"){curt-=wh;}else{curt+=wh;}
				sett();
				sp+=2;
				var t =500 - sp*50;
				if(t<=0){t=0};
				stime = settimeout(function(){self.timesett(d);},t);
			}
			jscrolle.bind("mousedown",function(e){
					j['fn'] && j['fn'].call(_self);
							curt = curt + e.pagey - jscrollh.offset().top - sh/2;
							asett();
							return false;
			});
			function asett(){				
						if(curt<bw){curt=bw;}
						if(curt>dh-sh-bw){curt=dh-sh-bw;}
						jscrollh.stop().animate({top:curt},100);
						var sct = -((curt-bw)*sch/(dh-2*bw));
						jscrollc.stop().animate({top:sct},1000);
			};
			function sett(){				
						if(curt<bw){curt=bw;}
						if(curt>dh-sh-bw){curt=dh-sh-bw;}
						jscrollh.css({top:curt});
						var sct = -((curt-bw)*sch/(dh-2*bw));
						jscrollc.css({top:sct});
			};
			$(_self).mousewheel(function(){
					if(allows!=true) return;
					j['fn'] && j['fn'].call(_self);
						if(this.d>0){curt-=wh;}else{curt+=wh;};
						sett();
			})
		});
	}
});