/*
 *仿百度百科右侧导航代码 - 页面目录结构导航 v0.01
 * 只写了两级，无限级别也可以，是逻辑上的级别，html结构全是同一级别
 * 滑标动画用的css3过渡动画，不支持的浏览器就没动画效果了
 * 和百度百科比起来还是比较弱，没有实现右边也可以滚动的功能
 */
 function DirectoryNav($h,config){
  this.opts = $.extend(true,{
   scrollThreshold:0.5, //滚动检测阀值 0.5在浏览器窗口中间部位
   scrollSpeed:700,  //滚动到指定位置的动画时间
   scrollTopBorder:500, //滚动条距离顶部多少的时候显示导航
   easing: \'swing\',  //不解释
   delayDetection:200,  //延时检测，避免滚动的时候检测过于频繁
   scrollChange:function(){}
  },config);
  this.$win = $(window);
  this.$h = $h;
  this.$pageNavList = \"\";
  this.$pageNavListLis =\"\";
  this.$curTag = \"\";
  this.$pageNavListLiH = \"\";
  this.offArr = [];
  this.curIndex = 0;
  this.scrollIng = false;
  this.init();
 }
 DirectoryNav.prototype = {
  init:function(){
   this.make();
   this.setArr();
   this.bindEvent();
  },
  make:function(){
   //生成导航目录结构,这是根据需求自己生成的。如果你直接在页面中输出一个结构那也挺好不用 搞js
   $(\"body\").append(\'<div class=\"directory-nav\" id=\"directoryNav\"><ul></ul><span class=\"cur-tag\"></span><span class=\"c-top\"></span><span class=\"c-bottom\"></span><span class=\"line\"></span></div>>\');
   var $hs = this.$h,
    $directoryNav = $(\"#directoryNav\"),
    temp = [],
    index1 = 0,
    index2 = 0;
   $hs.each(function(index){
    var $this = $(this),
      text = $this.text();
    if(this.tagName.toLowerCase()==\'h2\'){
     index1++;
     if(index1%2==0) index2 = 0;
     temp.push(\'<li class=\"l1\"><span class=\"c-dot\"></span>\'+index1+\'. <a class=\"l1-text\">\'+text+\'</a></li>\');
    }else{
     index2++;
     temp.push(\'<li class=\"l2\">\'+index1+\'.\'+index2+\' <a class=\"l2-text\">\'+text+\'</a></li>\');
    }
   });
   $directoryNav.find(\"ul\").html(temp.join(\"\"));
   //设置变量
   this.$pageNavList = $directoryNav;
   this.$pageNavListLis = this.$pageNavList.find(\"li\");
   this.$curTag = this.$pageNavList.find(\".cur-tag\");
   this.$pageNavListLiH = this.$pageNavListLis.eq(0).height();
   if(!this.opts.scrollTopBorder){
    this.$pageNavList.show();
   }
  },
  setArr:function(){
   var This = this;
   this.$h.each(function(){
    var $this = $(this),
     offT = Math.round($this.offset().top);
    This.offArr.push(offT);
   });
  },
  posTag:function(top){
   this.$curTag.css({top:top+\'px\'});
  },
  ifPos:function(st){
   var offArr = this.offArr;
   //console.log(st);
   var windowHeight = Math.round(this.$win.height() * this.opts.scrollThreshold);
   for(var i=0;i<offArr.length;i++){
    if((offArr[i] - windowHeight) < st) {
     var $curLi = this.$pageNavListLis.eq(i),
      tagTop = $curLi.position().top;
     $curLi.addClass(\"cur\").siblings(\"li\").removeClass(\"cur\");
     this.curIndex = i;
     this.posTag(tagTop+this.$pageNavListLiH*0.5);
     //this.curIndex = this.$pageNavListLis.filter(\".cur\").index();
     this.opts.scrollChange.call(this);
    }
   }
  },
  bindEvent:function(){
   var This = this,
    show = false,
    timer = 0;
   this.$win.on(\"scroll\",function(){
    var $this = $(this);
    clearTimeout(timer);
    timer = setTimeout(function(){
     This.scrollIng = true;
     if($this.scrollTop()>This.opts.scrollTopBorder){
      if(!This.$pageNavListLiH) This.$pageNavListLiH = This.$pageNavListLis.eq(0).height();
      if(!show){
       This.$pageNavList.fadeIn();
       show = true;
      }
      This.ifPos( $(this).scrollTop() );
     }else{
      if(show){
       This.$pageNavList.fadeOut();
       show = false;
      }
     }
    },This.opts.delayDetection);
   });
   this.$pageNavList.on(\"click\",\"li\",function(){
    var $this = $(this),
     index = $this.index();
    This.scrollTo(This.offArr[index]);
   })
  },
  scrollTo: function(offset,callback) {
   var This = this;
   $(\'html,body\').animate({
    scrollTop: offset
   }, this.opts.scrollSpeed, this.opts.easing, function(){
    This.scrollIng = false;
    //修正弹两次回调 蛋疼
    callback && this.tagName.toLowerCase()==\'body\' && callback();
   });
  }
 };
 //调用实例化
 var directoryNav = new DirectoryNav($(\"h2,h3\"),{
  scrollTopBorder:0 //滚动条距离顶部多少的时候显示导航，如果为0，则一直显示
 });