/* 滑动菜单
 * 作者：gavin
 * 创建时间：2009-02-26
 * 最后一次修改时间：2009-03-03
 */

var ddsmoothmenu={
//菜单参数设置
//specify full url to down and right arrow images (23 is padding-right added to top level lis with drop downs):
arrowimages: {down:['downarrowclass', './images/down.gif', 0], right:['rightarrowclass', './images/right.gif']},
//用时：
transition: {overtime:300, outtime:300},

///////stop configuring beyond here///////////////////////////

detectwebkit: navigator.useragent.tolowercase().indexof("applewebkit")!=-1, //detect webkit browsers (safari, chrome etc)

getajaxmenu:function($, setting){ //function to fetch external page containing the panel divs
	var $menucontainer=$('#'+setting.contentsource[0]) //reference empty div on page that will hold menu
	$menucontainer.html("loading menu...")
	$.ajax({
		url: setting.contentsource[1], //path to external menu file
		async: true,
		error:function(ajaxrequest){
			$menucontainer.html('error fetching content. server response: '+ajaxrequest.responsetext)
		},
		success:function(content){
			$menucontainer.html(content)
			ddsmoothmenu.buildmenu($, setting)
		}
	})
},

buildmenu:function($, setting){
	var smoothmenu=ddsmoothmenu
	var $mainmenu=$("#"+setting.mainmenuid+">ul") //reference main menu ul
	var $headers=$mainmenu.find("ul").parent()
    $mainmenu.filter(":empty").remove()
	$headers.each(function(i){
		var $curobj=$(this).css({zindex: 100-i}) //reference current li header
		var $subul=$(this).find('ul:eq(0)').css({display:'block'})
		this._dimensions={w:this.offsetwidth, h:this.offsetheight, subulw:$subul.outerwidth(), subulh:$subul.outerheight()}
		this.istopheader=$curobj.parents("ul").length==1? true : false //is top level header?
		$subul.css({top:this.istopheader? this._dimensions.h+"px" : 0})
        /************* begin adding arrow **********/
        /*$curobj.children("a:eq(0)").css(this.istopheader? {paddingright: smoothmenu.arrowimages.down[2]} : {}).append(
			'<img src="'+ (this.istopheader? smoothmenu.arrowimages.down[1] : smoothmenu.arrowimages.right[1])
			+'" class="' + (this.istopheader? smoothmenu.arrowimages.down[0] : smoothmenu.arrowimages.right[0])
			+ '" style="border:0;" />'
		)*/
        /************* end adding arrow **********/
		$curobj.hover(
			function(e){
				var $targetul=$(this).children("ul:eq(0)")
				this._offsets={left:$(this).offset().left, top:$(this).offset().top}
				var menuleft=this.istopheader? 0 : this._dimensions.w
				menuleft=(this._offsets.left+menuleft+this._dimensions.subulw>$(window).width())? (this.istopheader? -this._dimensions.subulw+this._dimensions.w : -this._dimensions.w) : menuleft //calculate this sub menu's offsets from its parent
				if ($targetul.queue().length<=1){ //if 1 or less queued animations
					$targetul.css({left:menuleft+"px", width:this._dimensions.subulw+'px'}).animate({height:'show',opacity:'show'}, ddsmoothmenu.transition.overtime)
				}
                $(this).children("a").addclass("active")
			},
			function(e){
				var $targetul=$(this).children("ul:eq(0)")
				$targetul.animate({height:'hide', opacity:'hide'}, ddsmoothmenu.transition.outtime)
                $(this).children("a").removeclass("active")
			}
		) //end hover
	}) //end $headers.each()
	$mainmenu.find("ul").css({display:'none', visibility:'visible'})
},

init:function(setting){
	if (typeof setting.customtheme=="object" && setting.customtheme.length==2){
		var mainmenuid='#'+setting.mainmenuid
		document.write('<style type="text/css">\n'
			+mainmenuid+', '+mainmenuid+' ul li a {background:'+setting.customtheme[0]+';}\n'
			+mainmenuid+' ul li a:hover {background:'+setting.customtheme[1]+';}\n'
		+'</style>')
	}
	jquery(document).ready(function($){ //override default menu colors (default/hover) with custom set?
        //alert(setting.mainmenuid);
        $("#"+setting.mainmenuid+" ul").not(":has('li')").remove()
		if (typeof setting.contentsource=="object"){ //if external ajax menu
			ddsmoothmenu.getajaxmenu($, setting)
		}
		else{ //else if markup menu
			ddsmoothmenu.buildmenu($, setting)
		}
	})
}

} //end ddsmoothmenu variable

//初始化菜单:
ddsmoothmenu.init({
	mainmenuid: "mainnav", //菜单 div id
	contentsource: "markup" //"markup" or ["container_id", "path_to_menu_file"]
})