jQuery焦点图插件SaySlide

(function($){
  $.fn.saySlide=function(options){
    var defaults={
      autoTime:3000,//自动播放时间间隔
      speed:500,//切换速度
      autodir:'RL',//自动播放方向，LR左到右，RL右到左，TB上到下，BT下到上, jQuery自带的动画：jq.fadeOut , jq.slideUp , jq.hide
      isTitle:false,//是否显示标题
      isBlank:true,//是否在新窗口打开链接
      isBottombg:true,//是否显示底部半透明背景,该设置只有在isTitle为false生效
      defaultBg:"#999999",//定义底部按钮默认颜色
      currentBg:"#ffffff",//定义底部按钮激活状态颜色
      btnAlign:"center",//按钮左中右位置，left,center,right
      fontSize:"14px"
    };
    var _this=$(this), len=_this.children().length, _thisChildren;
    options.Width=_this.width() || 0;
    options.Height=_this.height() || 0;
    options.Imgs=options.ImgsO=_this.children();
    options.nowImg=0;
    options.isLink = $(options.Imgs[0]).attr("href") === undefined ? false : true; //根据第一张图片是否有href属性来判断是否给图片加上链接
    var options=$.extend(defaults,options);
    switch(options.autodir){
      case "LR":options.pos="right";break;
      case "RL":options.pos="left";break;
      case "BT":options.pos="top";break;
      case "TB":options.pos="bottom";break;
      default:
        if(/jq\\./.test(options.autodir)){
          options.jq=options.autodir.slice(3);
          options.autodir="jq";
        }else{
          alert("autodir参数不正确");
        }
    }
    var SaySlide=function(opt){
      this.opt=opt;
    }
    SaySlide.prototype={
      _init:function(){
        this.BulkImgs();
        this.AutoPlay();
        this.PausePlay();
        this.BtnClick();
      },
      BoxBtn:function(){
        var me=this.opt, boxHtml='';
        for(var i=0;i<len;i++){
          var bg=i==0?me.currentBg:me.defaultBg;
          boxHtml+='<i style="background-color:'+ bg +'" index="'+ i +'"></i>';
        }
        var textAlign=me.isTitle==true ? "right" : me.btnAlign;
        boxHtml='<div class="saySlide-bottom-btn" style="text-align:'+ textAlign +'"><span>'+ boxHtml +'</span></div>';
        return boxHtml;
      },
      BulkImgs:function(){
        var me=this.opt, ImgsArr=new Array;
        for(var i=0;i<len;i++){
          if(me.isLink===true){
            var link=$(me.Imgs[i]).attr({"width":me.Width,"height":me.Height}).attr("href");
            $(me.Imgs[i]).removeAttr("href");
            ImgsArr[i]="<a href='"+ link +"' index='"+ i +"'>"+me.Imgs[i].outerHTML+'</a>';
          }else{
            $(me.Imgs[i]).attr({"width":me.Width,"height":me.Height});
            ImgsArr[i]="<a index='"+ i +"'>"+me.Imgs[i].outerHTML+'</a>';
          }
        }        
        if(me.autodir=="LR" || me.autodir=="TB" || me.autodir=="jq"){
          var ImgsStr=ImgsArr.reverse().join('');
        }else{
          var ImgsStr=ImgsArr.join('');
        }
        _this.html(ImgsStr);
        me.Imgs=_this.children();
        if(me.autodir!="jq"){
          _this.wrapInner("<div class='saySlide-box' />");
          _thisChildren=_this.children("div.saySlide-box");
          var divWidth=me.autodir=="LR" || me.autodir=="RL" ? me.Width*len :me.Width;
          _thisChildren.width(divWidth).css(me.pos,"0");
        }else{
          _this.addClass("saySlide-fade");
        }
        var opacityBg=me.isBottombg===true || me.isTitle===true ? '<div class="saySlide-opacity-bg"></div>' : '';//如果有标题，则透明背景强制显示
        _this.append(this.BoxBtn() + opacityBg);
        me.BtnArr=_this.find("i");
        if(me.isTitle===true){
          this.BuildTitle();
        }
      },
      /* 构造标题 */
      BuildTitle:function(){
        var _w=14*len, me=this.opt;
        _w=me.Width - _w - 20 - 40;
        _this.append('<div class="saySlide-title" />');
        me.titleBox=_this.children("div.saySlide-title").css({"font-size":me.fontSize,width:_w});
        me.titleBox.text($(me.ImgsO[0]).attr("alt"));
      },
      /* 自动播放 */
      AutoPlay:function(){
        var self=this, me=this.opt;
        self.t=setInterval(function(){
          self.PicPlay();
        },me.autoTime);
      },
      /* 鼠标经过时清除定时 */
      PausePlay:function(){
        var self=this;
        _this.hover(function(){
          clearInterval(self.t);
        },function(){
          self.AutoPlay();
        });
      },
      PicPlay:function(){
        var me=this.opt;
        if(me.autodir=="RL" || me.autodir=="BT"){
          this.MoveV(me.autodir);
        }else if(me.autodir=="LR" || me.autodir=="TB"){
          this.MoveH(me.autodir);
        }else if(me.autodir=="jq"){
          this.MovejQ();
        }
        var current=me.nowImg > len-1 ? 0 : me.nowImg;
        $(me.BtnArr[current]).css("background-color",me.currentBg).siblings().css("background-color",me.defaultBg);
        if(me.isTitle===true){
          me.titleBox.text($(me.ImgsO[current]).attr("alt"));
        }
      },
      /* 点击标签按钮 */
      BtnClick:function(){
        var self=this, me=this.opt;
        _this.delegate("i","click",function(){
          var clicked=parseInt($(this).attr("index"));
          me.nowImg=clicked;
          if(me.autodir=="RL" || me.autodir=="BT"){
            var prevImgs=_thisChildren.find("a[index='"+ clicked +"']").prevAll();
            prevImgs=$.makeArray(prevImgs).reverse();
            _thisChildren.css(me.pos,"0");
            $(prevImgs).appendTo(_thisChildren);
          }else if(me.autodir=="LR" || me.autodir=="TB"){
            var prevImgs=_thisChildren.find("a[index='"+ clicked +"']").nextAll();
            _thisChildren.css(me.pos,"0");
            $(prevImgs).prependTo(_thisChildren);            
          }else if(me.autodir=="jq"){
            var prevImgs=_this.find("a[index='"+ clicked +"']").nextAll("a");
            prevImgs.prependTo(_this);
          }
          $(this).css("background-color",me.currentBg).siblings().css("background-color",me.defaultBg);
        });       
      },
      /* 从右到左播放 、 从下到上播放 */
      MoveV:function(type){
        var me=this.opt, current;
        me.nowImg = me.nowImg+1 > len ? 1 : me.nowImg+1;
        current = me.nowImg - 1;
        if(type=="RL"){
          _thisChildren.animate({"left":"-"+me.Width},me.speed,function(){
            $(me.Imgs[current]).appendTo($(this));
            $(this).css("left","0");
          });
        }else if(type=="BT"){
          _thisChildren.animate({"top":"-"+me.Height},me.speed,function(){
            $(me.Imgs[current]).appendTo($(this));
            $(this).css("top","0");
          });
        }
      },
      /* 淡入淡出 */
      MovejQ:function(){
        var me=this.opt, current;
        me.nowImg = me.nowImg+1 > len-1 ? 0 : me.nowImg+1;
        current = len - me.nowImg == len ? 0 : len-me.nowImg;
        var arg1=me.speed;
        var arg2=function(){$(this).prependTo(_this).show();};
        if(me.jq=="fadeOut"){
          $(me.Imgs[current]).fadeOut(arg1,arg2);
        }else if(me.jq=="hide"){
          $(me.Imgs[current]).hide(arg1,arg2);
        }else if(me.jq=="slideUp"){
          $(me.Imgs[current]).slideUp(arg1,arg2);
        }else{
          return ;
        }

      },
      /* 从左到右播放 、 从上到下播放 */
      MoveH:function(type){
        var me=this.opt, current;
        me.nowImg = me.nowImg+1 > len-1 ? 0 : me.nowImg+1;
        current = len - me.nowImg == len ? 0 : len-me.nowImg;
        if(type=="LR"){
          _thisChildren.animate({"right":"-"+me.Width},me.speed,function(){
            $(me.Imgs[current]).prependTo($(this));
            $(this).css("right","0");
          });
        }else if(type=="TB"){
          _thisChildren.animate({"bottom":"-"+me.Height},me.speed,function(){
            $(me.Imgs[current]).prependTo($(this));
            $(this).css("bottom","0");
          });
        }
      }
    }
    var _SaySlide=new SaySlide(options);
    _SaySlide._init();
  }
})(jQuery);