$(document).ready(function() {  
    // 图片上下滚动
    var count = $("#imageMenu li").length ; /* 显示 5 个 li标签内容 */
    var interval = $("#imageMenu li:first").height();
    var curIndex = 0;
    if( curIndex > count ) curIndex = 0;
	//左右箭头切换图片
    $('.scrollbutton').click(function(){
        if( $(this).hasClass('disabled') ) return false;
        
        if ($(this).hasClass('smallImgUp')) --curIndex;
        else ++curIndex;
        
        $('.scrollbutton').removeClass('disabled');
        if (curIndex == 0) $('.smallImgUp').addClass('disabled');
        if (curIndex == count-1) $('.smallImgDown').addClass('disabled');
        
        $("#imageMenu ul").stop(false, true).animate({"marginTop" : -curIndex*interval + "px"}, 600);
		
		//获取当前指定的图片属性
		var midImg = $("#imageMenu li").eq(curIndex).find('img').attr('src');
		//切换图片
		$("#midimg").attr('src',midImg);
		$(".enlarge-img").find("img").attr('src',midImg);
		//小图添加属性
		$("#imageMenu li").eq(curIndex).addClass('on').siblings().removeClass("on");
		
    });
    
	
		//大图左右箭头切换图片
    $('.scrollbutton_01').click(function(){
        if( $(this).hasClass('disabled') ) return false;
        
        if ($(this).hasClass('smallImgUp')) --curIndex;
        else ++curIndex;
		
        
        $('.scrollbutton_01').removeClass('disabled');
		
        if (curIndex == 0) $('.smallImgUp').addClass('disabled');
        if (curIndex == count-1) $('.smallImgDown').addClass('disabled');
        
        //$("#imageMenu ul").stop(false, true).animate({"marginTop" : -curIndex*interval + "px"}, 600);
		 $("#imageMenu ul").stop(false, true).animate({"marginTop" : -curIndex*interval + "px"}, 600);
		//获取当前指定的图片属性
		var midImg = $("#imageMenu li").eq(curIndex).find('img').attr('src');
		//切换图片
		$("#midimg").attr('src',midImg);
		$(".enlarge-img").find("img").attr('src',midImg);
		//小图添加属性
		$("#imageMenu li").eq(curIndex).addClass('on').siblings().removeClass("on");
		
    });
    // 解决 ie6 select框 问题
    $.fn.decorateIframe = function(options) {
        if ($.browser.msie && $.browser.version < 7) {
            var opts = $.extend({}, $.fn.decorateIframe.defaults, options);
            $(this).each(function() {
                var $myThis = $(this);
                //创建一个IFRAME
                var divIframe = $("<iframe />");
                divIframe.attr("id", opts.iframeId);
                divIframe.css("position", "absolute");
                divIframe.css("display", "none");
                divIframe.css("display", "block");
                divIframe.css("z-index", opts.iframeZIndex);
                divIframe.css("border");
                divIframe.css("top", "0");
                divIframe.css("left", "0");
                if (opts.width == 0) {
                    divIframe.css("width", $myThis.width() + parseInt($myThis.css("padding")) * 2 + "px");
                }
                if (opts.height == 0) {
                    divIframe.css("height", $myThis.height() + parseInt($myThis.css("padding")) * 2 + "px");
                }
                divIframe.css("filter", "mask(color=#fff)");
                $myThis.append(divIframe);
            });
        }
    }
    $.fn.decorateIframe.defaults = {
        iframeId: "decorateIframe1",
        iframeZIndex: -1,
        width: 0,
        height: 0
    }
    //放大镜视窗
    $("#bigView").decorateIframe();

    //点击到中图
    var midChangeHandler = null;
    
    $("#imageMenu li img").bind("click", function(){
        if ($(this).attr("id") != "onlickImg") {
            midChange($(this).attr("src"));
            $("#imageMenu li").removeAttr("id");
            $(this).parent().attr("id", "onlickImg");
        }
    }).bind("mouseover", function(){
        if ($(this).attr("id") != "onlickImg") {
            window.clearTimeout(midChangeHandler);
            midChange($(this).attr("src"));
            // $(this).css({ "border": "1px solid #990000" });
        }
    }).bind("mouseout", function(){
        if($(this).attr("id") != "onlickImg"){
            $(this).removeAttr("style");
            midChangeHandler = window.setTimeout(function(){
                midChange($("#onlickImg img").attr("src"));
            }, 1000);
        }
    });
	//点击中图，切换大图
	$("#midimg").bind("click", function(){
		$(".enlarge-img").find("img").attr("src",$(this).attr("src"));
	});
	
    function midChange(src) {
        $("#midimg").attr("src", src).load(function() {
            changeViewImg();
        });
    }

    //大视窗看图
    function mouseover(e) {
        if ($("#winSelector").css("display") == "none") {
            $("#winSelector,#bigView").show();
        }

        $("#winSelector").css(fixedPosition(e));
        e.stopPropagation();
    }


    function mouseOut(e) {
        if ($("#winSelector").css("display") != "none") {
            $("#winSelector,#bigView").hide();
        }
        e.stopPropagation();
    }


    $("#midimg").mouseover(mouseover); //中图事件
    $("#midimg,#winSelector").mousemove(mouseover).mouseout(mouseOut); //选择器事件

    var $divWidth = $("#winSelector").width(); //选择器宽度
    var $divHeight = $("#winSelector").height(); //选择器高度
    var $imgWidth = $("#midimg").width(); //中图宽度
    var $imgHeight = $("#midimg").height(); //中图高度
    var $viewImgWidth = $viewImgHeight = $height = null; //IE加载后才能得到 大图宽度 大图高度 大图视窗高度

    function changeViewImg() {
        $("#bigView img").attr("src", $("#midimg").attr("src"));
    }

    changeViewImg();

    $("#bigView").scrollLeft(0).scrollTop(0);
    function fixedPosition(e) {
        if (e == null) {
            return;
        }
        var $imgLeft = $("#midimg").offset().left; //中图左边距
        var $imgTop = $("#midimg").offset().top; //中图上边距
        X = e.pageX - $imgLeft - $divWidth / 2; //selector顶点坐标 X
        Y = e.pageY - $imgTop - $divHeight / 2; //selector顶点坐标 Y
        X = X < 0 ? 0 : X;
        Y = Y < 0 ? 0 : Y;
        X = X + $divWidth > $imgWidth ? $imgWidth - $divWidth : X;
        Y = Y + $divHeight > $imgHeight ? $imgHeight - $divHeight : Y;

        if ($viewImgWidth == null) {
            $viewImgWidth = $("#bigView img").outerWidth();
            $viewImgHeight = $("#bigView img").height();
            if ($viewImgWidth < 200 || $viewImgHeight < 200) {
                $viewImgWidth = $viewImgHeight = 800;
            }
            $height = $divHeight * $viewImgHeight / $imgHeight;
            $("#bigView").width($divWidth * $viewImgWidth / $imgWidth);
            $("#bigView").height($height);
        }

        var scrollX = X * $viewImgWidth / $imgWidth;
        var scrollY = Y * $viewImgHeight / $imgHeight;
        $("#bigView img").css({ "left": scrollX * -1, "top": scrollY * -1 });
        $("#bigView").css({ "top": 0, "left": $(".preview").offset().left + $(".preview").width() + 15 });

        return { left: X, top: Y };
    }
});