/*
 * jQuery UI Position 1.8rc1
 *
 * Copyright (c) 2010 AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *乐度
 * http://docs.jquery.com/UI/Position
 */
(function($){$.ui=$.ui||{};var horizontalPositions=/left|center|right/,horizontalDefault='center',verticalPositions=/top|center|bottom/,verticalDefault='center',_position=$.fn.position;$.fn.position=function(options){if(!options||!options.of){return _position.apply(this,arguments)}options=$.extend({},options);var target=$(options.of),collision=(options.collision||'flip').split(' '),offset=options.offset?options.offset.split(' '):[0,0],targetWidth,targetHeight,basePosition;if(options.of.nodeType===9){targetWidth=target.width();targetHeight=target.height();basePosition={top:0,left:0}}else if(options.of.scrollTo&&options.of.document){targetWidth=target.width();targetHeight=target.height();basePosition={top:target.scrollTop(),left:target.scrollLeft()}}else if(options.of.preventDefault){options.at='left top';targetWidth=targetHeight=0;basePosition={top:options.of.pageY,left:options.of.pageX}}else{targetWidth=target.outerWidth();targetHeight=target.outerHeight();basePosition=target.offset()}$.each(['my','at'],function(){var pos=(options[this]||'').split(' ');pos=pos.length==1?horizontalPositions.test(pos[0])?pos.concat([verticalDefault]):verticalPositions.test(pos[0])?[horizontalDefault].concat(pos):[horizontalDefault,verticalDefault]:pos;pos[0]=horizontalPositions.test(pos[0])?pos[0]:horizontalDefault;pos[1]=verticalPositions.test(pos[1])?pos[1]:verticalDefault;options[this]=pos});if(collision.length==1){collision[1]=collision[0]}offset[0]=parseInt(offset[0],10)||0;if(offset.length==1){offset[1]=offset[0]}offset[1]=parseInt(offset[1],10)||0;switch(options.at[0]){case'right':basePosition.left+=targetWidth;break;case horizontalDefault:basePosition.left+=targetWidth/2;break}switch(options.at[1]){case'bottom':basePosition.top+=targetHeight;break;case verticalDefault:basePosition.top+=targetHeight/2;break}basePosition.left+=offset[0];basePosition.top+=offset[1];return this.each(function(){var elem=$(this),elemWidth=elem.outerWidth(),elemHeight=elem.outerHeight(),position=$.extend({},basePosition),over,myOffset,atOffset;switch(options.my[0]){case'right':position.left-=elemWidth;break;case horizontalDefault:position.left-=elemWidth/2;break}switch(options.my[1]){case'bottom':position.top-=elemHeight;break;case verticalDefault:position.top-=elemHeight/2;break}$.each(['left','top'],function(i,dir){($.ui.position[collision[i]]&&$.ui.position[collision[i]][dir](position,{targetWidth:targetWidth,targetHeight:targetHeight,elemWidth:elemWidth,elemHeight:elemHeight,offset:offset,my:options.my,at:options.at}))});($.fn.bgiframe&&elem.bgiframe());elem.offset($.extend(position,{using:options.using}))})};$.ui.position={fit:{left:function(position,data){var over=position.left+data.elemWidth-$(window).width()-$(window).scrollLeft();position.left=over>0?position.left-over:Math.max(0,position.left)},top:function(position,data){var over=position.top+data.elemHeight-$(window).height()-$(window).scrollTop();position.top=over>0?position.top-over:Math.max(0,position.top)}},flip:{left:function(position,data){if(data.at[0]=='center')return;var over=position.left+data.elemWidth-$(window).width()-$(window).scrollLeft(),myOffset=data.my[0]=='left'?-data.elemWidth:data.my[0]=='right'?data.elemWidth:0,offset=-2*data.offset[0];position.left+=position.left<0?myOffset+data.targetWidth+offset:over>0?myOffset-data.targetWidth+offset:0},top:function(position,data){if(data.at[1]=='center')return;var over=position.top+data.elemHeight-$(window).height()-$(window).scrollTop(),myOffset=data.my[1]=='top'?-data.elemHeight:data.my[1]=='bottom'?data.elemHeight:0,atOffset=data.at[1]=='top'?data.targetHeight:-data.targetHeight,offset=-2*data.offset[1];position.top+=position.top<0?myOffset+data.targetHeight+offset:over>0?myOffset+atOffset+offset:0}}};if(!$.offset.setOffset){$.offset.setOffset=function(elem,options){if(/static/.test(jQuery.curCSS(elem,'position'))){elem.style.position='relative'}var curElem=jQuery(elem),curOffset=curElem.offset(),curTop=parseInt(jQuery.curCSS(elem,'top',true),10)||0,curLeft=parseInt(jQuery.curCSS(elem,'left',true),10)||0,props={top:(options.top-curOffset.top)+curTop,left:(options.left-curOffset.left)+curLeft};if('using'in options){options.using.call(elem,props)}else{curElem.css(props)}};var _offset=$.fn.offset;$.fn.offset=function(options){var elem=this[0];if(!elem||!elem.ownerDocument){return null}if(options){return this.each(function(){$.offset.setOffset(this,options)})}return _offset.call(this)}}})(jQuery);