/*@author xiaojue*/
//使用说明
//scroller(el, duration)
//el : 目标锚点 ID
//duration : 持续时间，以毫秒为单位，越小越快

// 转换为数字
function intval(v)
{
    v = parseInt(v);
    return isNaN(v) ? 0 : v;
}

// 获取元素信息
function getPos(e)
{
    var l = 0;
    var t = 0;
    var w = intval(e.style.width);
    var h = intval(e.style.height);
    var wb = e.offsetWidth;
    var hb = e.offsetHeight;
    while (e.offsetParent){
        l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
        t += e.offsetTop + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
        e = e.offsetParent;
    }
    l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
    t += e.offsetTop + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
    return {x:l, y:t, w:w, h:h, wb:wb, hb:hb};
}

//获取滚动条信息
function getScroll() 
{
    var t, l, w, h;
    
    if (document.documentElement && document.documentElement.scrollTop) {
        t = document.documentElement.scrollTop;
        l = document.documentElement.scrollLeft;
        w = document.documentElement.scrollWidth;
        h = document.documentElement.scrollHeight;
    } else if (document.body) {
        t = document.body.scrollTop;
        l = document.body.scrollLeft;
        w = document.body.scrollWidth;
        h = document.body.scrollHeight;
    }
    return { t: t, l: l, w: w, h: h };
}

// 锚点(Anchor)间平滑跳转
function scroller(el, duration)
{
    if(typeof el != 'object') { el = document.getElementById(el); }

    if(!el) return;
    
    var z = this;
    z.el = el;
    z.p = getPos(el);
    z.s = getScroll();
    z.clear = function(){window.clearInterval(z.timer);z.timer=null};
    z.t=(new Date).getTime();

    z.step = function(){
        var t = (new Date).getTime();
        var p = (t - z.t) / duration;
        if (t >= duration + z.t) {
            z.clear();
            window.setTimeout(function(){z.scroll(z.p.y, z.p.x)},13);
        } else {
            st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t;
            sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l;
            z.scroll(st, sl);
        }
    };
    z.scroll = function (t, l){window.scrollTo(l, t)};
    z.timer = window.setInterval(function(){z.step();},13);
}
//传递参数
function goto(id){
	el="book"+id;
	scroller(el, 1500)
}
$(function(){	 
var rel=document.getElementsByTagName("h2");
	for(i=0;i<rel.length;i++){
		if(rel[i].getAttribute("rel")!="bookmark") continue;
		$("#toolscontent").append("<a href='#book"+i+"' class='size' onclick='goto("+i+")'>"+i+"</a>");
		rel[i].setAttribute("id","book"+i);
	}
var none=$("h2[rel='bookmark']").length;
if(none==0){
	$("#message").css({"line-height":"14px","padding-top":"10px"});		
	$("#message").text("这儿就一篇文章,不用快速定位了...");		
}
$(".size").not(".backtop").hover(function(){
		var j=$(this).text()
		var messages=$("h2[rel='bookmark']").eq(j).text();
		if(messages.length>10){
		var message;
		message=messages.slice(0,8)+"...";
		$("#message").text(message);
		}
		else{
		$("#message").text(messages);
		}
		$(this).attr("title",messages);
						  },function(){
		$("#message").text("本页文章快速定位...")			   
									   });
window.onscroll=function(){
var cen=(document.documentElement.scrollTop+document.documentElement.clientHeight/2)-50;
	$("#Tools").stop(true);
	$("#Tools").css("top",cen).animate({top:cen+20},120).animate({top:cen},80).animate({top:cen-10},80).animate({top:cen},120);
}
$("#toolsimg").toggle(function(){
	$("#Tools").animate({"width":"150px"},300);
	$(this).attr("title","关闭");
},function(){
	$("#Tools").animate({"width":"20px"},300);
	$(this).attr("title","展开");
});

$(".backtop").click(function(){
	var d=document.documentElement;
	var backtop=function(){
	d.scrollTop-=Math.ceil(d.scrollTop/10);
	if(d.scrollTop==0)clearInterval(timer);
	}
	timer=setInterval(backtop,10);
});

});