var zindex=100;
//弹出窗口插件
(function($){ 
	var b=null;
	var c=null;
	$.fn.window=function(options){
		$win=$(window);
		var options=$.extend({},$.fn.window.defaults,options);
		return this.each(function(){
			var _this=this;
			if(options.shadow)
				b = $("<div id='win_overlay' class='win_hide'></div>").hide().addclass('win_overlaybg').css('opacity', options.opacity).dblclick(function(){
					 if(b!=null)b.remove();
					 $(_this).css("display","none");
		          }).appendto('body').show();
			
			if($(_this).find(".window-header").length==0){
				zindex=zindex+1;
				//win标题
				var title_name="";
				$(_this).attr("title")?title_name=$(_this).attr("title") : title_name=options.title;
				var iframestr="<iframe  class='iframewin' frameborder='0'></iframe>"
							+"<div class='window-header' style='width:"+$(_this).width()+"px'><div class='window-header-move' style='width:"+($(_this).width()-30)+"px'><span class='win_title'>"+title_name+"</span></div><a href='javascript:void(0);' title='关闭'  class='win_close' onclick='win_close(this)'></a></div>";
				
				$("body").append($(_this).wrapinner("<div class='wincontent'></div>").prepend(iframestr));
			}
			
			//关闭win
			win_close=function(e){
				if(b!=null)b.remove();
				var st=$(e).parent().parent();
				if(options.cleardata)
					st.html("");
				st.css("display","none");
			}
		
			if(options.closed){
				if(options.cleardata)
					$(_this).html("");
				$(_this).css("display","none");
				if(b!=null)b.remove();
			}else{
				$(_this).css("z-index",zindex);			
				handleclick();
				$(_this).show();
				if(options.move)drag();
				setwincenter();
			}
			
			function handleclick(){
				 var con = $(_this).find(".wincontent");
				 if (options.requesttype && $.inarray(options.requesttype, ['iframe', 'ajax','img'])!=-1) {
						con.html("<div class='win_load'><div id='win_loading'><img src='"+options.winurl+"loading.gif' /></div></div>");			
						if (options.requesttype === "img") {
							var img = $("<img/>");
							img.attr("src",options.target);
							
							img.appendto(con.empty());
							$(_this).find(".window-header").width(img.width());
							setwincenter();
						}
						else if (options.requesttype === "ajax") {
								$.get(options.target, function(data){
									con.html(data);
									$(_this).find(".window-header").width($(_this).width());
									setwincenter();
								});
						}
						else {
								ifr = $("<iframe name='winiframe' style='width:" + options.iframewh.width + "px;height:" + options.iframewh.height + "px;' scrolling='auto' frameborder='0' src='" + options.target + "'></iframe>");
								ifr.appendto(con.empty());
								ifr.load(function(){
									try {
										
										$it = $(this).contents();
										fh = $it.height();//iframe height
										fw = $it.width();
										w = $win;
										neww = math.min(w.width() - 40, fw);
										newh = w.height() - 25 - (options.notitle ? 0 : 30);
										newh = math.min(newh, fh);
										if (!newh) 
											return;
										var lt = calposition(neww);
										c.css({
											left: lt[0],
											top: lt[1]
										});
										
										$(this).css({
											height: newh,
											width: neww
										});
									} 
									catch (e) {
									}
								});
								$(_this).find(".window-header").width($(_this).width());
							}
					
				}
				else if (options.target) {
						$(options.target).clone(true).show().appendto(con.empty());
				}
			}
			
			/*
	         * 居中显示
	         */
	        function setwincenter(){
	        	  var width = $(_this).width(),  lt = calposition(width);
	              $(_this).css({
	                  left: lt[0],
	                  top: lt[1]
	              });  
	              if(options.top>0){
	            	  $(_this).css({
		                  top: options.top
		              });  
	              }
	              if(options.left>0){
	            	  $(_this).css({
	            		  left: options.left
		              });  
	              }
	              if(b!=null){
		              var $h = $("body").height(), $wh = $win.height(),$hh=$("html").height();
		              $h = math.max($h, $wh);
		              b.height($h).width($win.width()+$win.scrollleft()) ;
	              }
	        }
	        /*
	         * 计算window的位置
	         */
	        function calposition(w){
	            l = $win.scrollleft()+(($win.width() - w) / 2);
	            if(l<0)l=0;
	            t = $win.scrolltop() + $win.height() /9;
	            
	            if(parseint($(_this).css("top"))>t){
	            	t=parseint($(_this).css("top"));
	            }
	            return [l, t];
	        }
	        /*
	         * 拖拽函数drag
	         */
	        function drag(){
	        	$(_this).find('.window-header-move').mousedown(function(e){
	              	var dx, dy, moveout;
	              	c=$(this).parent().parent();
	              	var t =$(this).parent();
	              	t.bind("selectstart", function(){
	  	                return false;
	  	            });
	                  dx = e.clientx - parseint(c.css("left"));
	                  dy = e.clienty - parseint(c.css("top"));
	                  c.mousemove(move).mouseout(out).css('opacity', 0.8);
	                  t.mouseup(up);
	                  
	                  function move(e){
	                      moveout = false;
	                      if (e.clientx - dx < 0) {
	                          l = 0;
	                      }
	                      else 
	                          if (e.clientx - dx > $win.width() - c.width()) {
	                              l = $win.width() - c.width();
	                          }
	                          else {
	                              l = e.clientx - dx
	                          }
	                      c.css({
	                          left: l,
	                          top: e.clienty - dy
	                      });
	                      
	                  }
	                  function out(e){
	                      moveout = true;
	                      settimeout(function(){
	                          moveout && up(e);
	                      }, 10);
	                  }
	                  function up(e){
	                      c.unbind("mousemove", move).unbind("mouseout", out).css('opacity', 1);
	                      t.unbind("mouseup", up);
	                  }
	              });
	        }
	        
		});
	};
	$.fn.window.defaults={
		notitle: false,
		opacity:0.7,
		title:"菜单窗口",
		shadow: false,
		target:null,
		requesttype:null,//iframe,ajax,img
		winurl:"img/",
		iframewh: {
            width: 400,
            height: 300
        },
		top:0,
		left:0,
		move:true,
		cleardata:false,
		closed:true
	};
})(jquery);