/**************************************************
名称: 图片轮播类
创建时间: 2007-11-12
示例:
	页面中已经存在名为imgPlayer(或者别的ID也行)的节点.
	PImgPlayer.addItem( "test", "http://www.pomoho.com", "http://static.pomoho.com/static/samesong/images/logo5.jpg");
	PImgPlayer.addItem( "test2", "http://www.pomoho.com.cn", "http://static.pomoho.com/static/samesong/images/logo4.jpg");
	PImgPlayer.addItem( "test3", "http://www.pomoho.com.cn", "http://static.pomoho.com/static/samesong/images/logo3.jpg");
	PImgPlayer.init( "imgPlayer", 200, 230 );
备注:
	适用于一个页面只有一个图片轮播的地方.
***************************************************/
var PImgPlayer = {
	/*
	 * PImgPlayer对象包含的属性
	 */	
	_timer : null,//时间对象属性
	_items : [],//内部项：包含标题属性title、链接地址link、及图片地址属性img
	_container : null,//容器对象属性
	_index : 0,//初始索引属性
	_imgs : [],//图片数组属性
	intervalTime : 5000,	//轮播间隔时间
	//初始化方法
	init : function( objID, w, h, time ){//参数列表:容器id、宽度、高度、轮播间隔时间、毫秒值
		this.intervalTime = time || this.intervalTime;//设置轮播间隔时间
		this._container = document.getElementById( objID );//获取容器对象
		this._container.style.display = "block";//显示容器
		this._container.style.width = w + "px";//设置容器宽度
		this._container.style.height = h + "px";//设置容器高度
		this._container.style.position = "relative";//设置容器位置
		this._container.style.overflow  = "hidden";//自动隐藏多余内容
		//this._container.style.border = "1px solid #fff";
		var linkStyle = "display: block; TEXT-DECORATION: none;";//样式
		if( document.all ){//浏览器判断
			linkStyle += "FILTER:";//增加各种滤镜效果
			linkStyle += "progid:DXImageTransform.Microsoft.Barn(duration=0.5, motion='out', orientation='vertical') ";
			linkStyle += "progid:DXImageTransform.Microsoft.Barn ( duration=0.5,motion='out',orientation='horizontal') ";
			linkStyle += "progid:DXImageTransform.Microsoft.Blinds ( duration=0.5,bands=10,Direction='down' )";
			linkStyle += "progid:DXImageTransform.Microsoft.CheckerBoard()";
			linkStyle += "progid:DXImageTransform.Microsoft.Fade(duration=0.5,overlap=0)";
			linkStyle += "progid:DXImageTransform.Microsoft.GradientWipe ( duration=1,gradientSize=1.0,motion='reverse' )";
			linkStyle += "progid:DXImageTransform.Microsoft.Inset ()";
			linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=1,irisStyle=PLUS,motion=out )";
			linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=1,irisStyle=PLUS,motion=in )";
			linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=1,irisStyle=DIAMOND,motion=in )";
			linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=1,irisStyle=SQUARE,motion=in )";
			linkStyle += "progid:DXImageTransform.Microsoft.Iris ( duration=0.5,irisStyle=STAR,motion=in )";
			linkStyle += "progid:DXImageTransform.Microsoft.RadialWipe ( duration=0.5,wipeStyle=CLOCK )";
			linkStyle += "progid:DXImageTransform.Microsoft.RadialWipe ( duration=0.5,wipeStyle=WEDGE )";
			linkStyle += "progid:DXImageTransform.Microsoft.RandomBars ( duration=0.5,orientation=horizontal )";
			linkStyle += "progid:DXImageTransform.Microsoft.RandomBars ( duration=0.5,orientation=vertical )";
			linkStyle += "progid:DXImageTransform.Microsoft.RandomDissolve ()";
			linkStyle += "progid:DXImageTransform.Microsoft.Spiral ( duration=0.5,gridSizeX=16,gridSizeY=16 )";
			linkStyle += "progid:DXImageTransform.Microsoft.Stretch ( duration=0.5,stretchStyle=PUSH )";
			linkStyle += "progid:DXImageTransform.Microsoft.Strips ( duration=0.5,motion=rightdown )";
			linkStyle += "progid:DXImageTransform.Microsoft.Wheel ( duration=0.5,spokes=8 )";
			linkStyle += "progid:DXImageTransform.Microsoft.Zigzag ( duration=0.5,gridSizeX=4,gridSizeY=40 ); width: 100%; height: 100%";
		}
		//
		var ulStyle = "margin:0;width:"+w+"px;position:absolute;z-index:999;right:5px;FILTER:Alpha(Opacity=30,FinishOpacity=90, Style=1);overflow: hidden;bottom:-1px;height:16px; border-right:1px solid #fff;";
		//
		var liStyle = "margin:0;list-style-type: none; margin:0;padding:0; float:right;";
		//
		var baseSpacStyle = "clear:both; display:block; width:23px;line-height:18px; font-size:12px; FONT-FAMILY:'宋体';opacity: 0.6;";
		baseSpacStyle += "border:1px solid #fff;border-right:0;border-bottom:0; ";
		baseSpacStyle += "color:#fff;text-align:center; cursor:pointer; ";
		//生成右下角图片编号html代码
		var ulHTML = "";
		for(var i = this._items.length -1; i >= 0; i--){
			var spanStyle = "";
			if( i==this._index ){
				spanStyle = baseSpacStyle + "background:#ff0000;";
			} else {				
				spanStyle = baseSpacStyle + "background:#000;";
			}
			ulHTML += "<li style=\""+liStyle+"\">";
			ulHTML += "<span onmouseover=\"PImgPlayer.mouseOver(this);\" onmouseout=\"PImgPlayer.mouseOut(this);\" style=\""+spanStyle+"\" onclick=\"PImgPlayer.play("+i+");return false;\" herf=\"javascript:;\" title=\"" + this._items[i].title + "\">" + (i+1) + "</span>";
			ulHTML += "</li>";
		}
		//生成图片及链接html代码
		var html = "<a href=\""+this._items[this._index].link+"\" title=\""+this._items[this._index].title+"\" target=\"_blank\" style=\""+linkStyle+"\"><img id='imgFro' src='"+this._items[0].img+"' center='center' width='"+w+"' height='"+h+"' border='0'/></a><ul style=\""+ulStyle+"\">"+ulHTML+"</ul>";
		this._container.innerHTML = html;//在容器内部插入图片
		var link = this._container.getElementsByTagName("A")[0];//获取容器内部设置的超链接对象
		link.style.width =  w + "px";//设置链接宽
		link.style.height = h + "px";//设置链接高
		
		document.getElementById("imgFro").src=this._items[0].img;//初始化第一张图片
		//link.style.background = 'url(' + this._items[0].img + ')  no-repeat   center center ';
		//link.style.background.width=652;
//		link.style.background
		//
		this._timer = setInterval( "PImgPlayer.play()", this.intervalTime );//设置定时器
	},
	addItem : function( _title, _link, _imgURL ){//增加图片方法
		_link = this.resetLink(_link);//重新设置链接地址,防止地址中没有包含http://
		this._items.push ( {title:_title, link:_link, img:_imgURL } );//增加内部项
		var img = new Image();//创建图片对象
		img.src = _imgURL;//设置src
		this._imgs.push( img );//为当前对象的图片数组属性增加元素
	},
	play : function( index ){//播放图片启动
		if( index!=null ){
			this._index = index;
			clearInterval( this._timer );//清空定时器
			this._timer = setInterval( "PImgPlayer.play()", this.intervalTime );//重新设置定时器
		} else {
			this._index = this._index<this._items.length-1 ? this._index+1 : 0;//计算索引值
		}
		var link = this._container.getElementsByTagName("A")[0];//取出链接
		if(link.filters){//滤镜效果
			var ren = Math.floor(Math.random()*(link.filters.length));//随机取出滤镜效果,随机切换滤镜效果
			link.filters[ren].Apply();//应用滤镜
			link.filters[ren].play();//播放滤镜
		}
		link.href = this._items[this._index].link;//设置链接
		link.title = this._items[this._index].title;//设置链接标题
		//link.style.background = 'url(' + this._items[this._index].img + ') no-repeat center center';

		var img = this._container.getElementsByTagName("IMG")[0];	//取出图像
		img.src=this._items[this._index].img;//设置图像
		//设置样式
		var liStyle = "margin:0;list-style-type: none; margin:0;padding:0; float:right;";
		var baseSpacStyle = "clear:both; display:block; width:23px;line-height:18px; font-size:12px; FONT-FAMILY:'宋体'; opacity: 0.6;";
		baseSpacStyle += "border:1px solid #fff;border-right:0;border-bottom:0;";
		baseSpacStyle += "color:#fff;text-align:center; cursor:pointer; ";
		var ulHTML = "";//设置右下角图片数字html代码
		for(var i = this._items.length -1; i >= 0; i--){
			var spanStyle = "";
			if( i==this._index ){
				spanStyle = baseSpacStyle + "background:#ff0000;";
			} else {				
				spanStyle = baseSpacStyle + "background:#000;";
			}
			ulHTML += "<li style=\""+liStyle+"\">";
			ulHTML += "<span onmouseover=\"PImgPlayer.mouseOver(this);\" onmouseout=\"PImgPlayer.mouseOut(this);\" style=\""+spanStyle+"\" onclick=\"PImgPlayer.play("+i+");return false;\" herf=\"javascript:;\" title=\"" + this._items[i].title + "\">" + (i+1) + "</span>";
			ulHTML += "</li>";
			
			
		}
		this._container.getElementsByTagName("UL")[0].innerHTML = ulHTML;	//右下角数字索引内容装载
	},
	mouseOver : function(obj){//鼠标悬停
		var i = parseInt( obj.innerHTML );
		if( this._index!=i-1){
			obj.style.color = "#ff0000";
		}
	},
	mouseOut : function(obj){//鼠标移出
		obj.style.color = "#fff";
	},
	resetLink : function(_link) {//重新设置超级链接,即给链接增加http://作为prefix,否则超链接会成为相对地址
		if (/^http/.test(_link)) {
			return _link;
		}
		else {
			return 'http://' + _link;
		}
	}
}