/*

 * 	exFixed 1.2.2 - jQuery plugin

 *	written by Cyokodog	

 *

 *	Copyright (c) 2009 Cyokodog (http://d.hatena.ne.jp/cyokodog/)

 *	Dual licensed under the MIT (MIT-LICENSE.txt)

 *	and GPL (GPL-LICENSE.txt) licenses.

 *

 *	Built for jQuery library

 *	http://jquery.com

 *

 */



(function($j){



	$j.ex = $j.ex || {};

	var ex = $j.extend({},$j.ex);



	/*

	 * 	ex.defineExPlugin 2.0

	 */

	ex.defineExPlugin = function( pluginName , constr , param){

		$j.fn[ pluginName ]=

			function( config , callback ){

				var o = this,arr = [];

				p = param ||{

					eachTarget : true

				};

				if(p.eachTarget)

					o.each(function( idx ){

						arr.push(new constr( o.eq(idx) , config ));

					});

				else

					arr.push(new constr( o , config ));

				var obj = $j(arr);

				for(var i in constr.prototype)( function(i){

					if(i.slice(0,1)!= '_'){

						obj[i] = function(){

							return obj[0][i].apply( obj[0] , arguments );

						};

					}

				})(i);

				obj.target = function(){ return o };

				o['get'+pluginName.substr(0,1).toUpperCase()+pluginName.substr(1)] = function(){

					return obj;

				};

				if(typeof callback == 'function')obj.each(callback);				

				return this;

			};

	};

	ex.scrollEvent = function( target , config ){

		var o = this;

		if( typeof config == 'function') config = {

			callback : config

		}

		var c = o.config = $j.extend({},ex.scrollEvent.defaults,config,{

			target : target

		});

		c.status = 0;

		c.scroll = o.getPos();

		c.target.scroll(function( evt ){

			if (o.isMove()) {

				c.status = (c.status == 0 ? 1 : (c.status == 1 ? 2 : c.status) );

				c.callback( evt , c );

			}

			if(c.tm) clearTimeout(c.tm);

			c.tm = setTimeout(function(){

				o.isMove();

				c.status = 0;

				c.callback( evt , c );

			},c.delay);

		});

	}

	$j.extend(ex.scrollEvent.prototype,{

		isMove : function(){

			var o = this, c = o.config;

			var pos = o.getPos();

			var scrollY = (pos.top != c.scroll.top);

			var scrollX = (pos.left != c.scroll.left);

			if(scrollY || scrollX){

				c.scrollY = scrollY;

				c.scrollX = scrollX;

				c.prevScroll = c.scroll;

				c.scroll = pos;

				return true;

			}

			return false;

		},

		getPos : function(){

			var o = this, c = o.config;

			return {

				top : c.target.scrollTop(),

				left : c.target.scrollLeft()

			}		

		}

	});

	ex.scrollEvent.defaults = {

		delay : 100

	}



	$j.ex.fixed = function(target, config){

		var o = this;

		var c = o.config = $j.extend({},$j.ex.fixed.defaults,config,{

			target : target,

			logicSize : {},

			rowSize : {},

			currentStyle : '',

			style : '',

			window : $j(window),

			staticFixed : false,		

			oldBrowser : $j.browser.msie && ($j.browser.version < 7.0 || !$j.boxModel)

		});



		if(c.baseNode) c.baseNode = $(c.baseNode);



		var size = o._cleanSize(c);



		//static ?

		o._eachSizeSet(function(idx , at1 , cm1){

			c.staticFixed = c.staticFixed || 

				(size[at1.pos1] == undefined && size[at1.pos2] == undefined);

		});



		if( c.oldBrowser ) o._padPos( size , o._cleanSize(c.target[0].currentStyle) );

		else if(c.staticFixed) return;



		c.container = $j.boxModel ? $j('html') : $j('body');

		c.container.height(); //for IE Bug



		c.target.css('position',c.oldBrowser ? 'absolute' : 'fixed');

		if(c.oldBrowser && !/hidden|scroll/i.test(c.target.css('overflow'))){

			c.target.css('overflow','hidden');

		}

		o._smoothPatch();



		o._fixed(size);

		c.window.resize( function(){

			if(c.oldBrowser || c.baseNode){

				o._fixed();

			}

		});



		if(!(c.fixedX && c.fixedY)){

			if (c.oldBrowser) {

				var tm;

				c.window.scroll(function(){

					if(tm) clearTimeout(tm);

					tm = setTimeout(function(){

						o._fixed();

					},0);

				});

			}

			else{

				new ex.scrollEvent(c.window,function( evt , pa ){

					if((pa.scrollX && !c.fixedX) || (pa.scrollY && !c.fixedY)){

						if(pa.status == 1){

							o._fixed(c.logicSize,{

								unfixed:true

							});

						}

						else

						if (pa.status == 0) {

							o._fixed();

						}

					}

				})

			}

		}

	}

	$j.ex.fixed.config = {

		smoothPatched : false

	};

	$j.ex.fixed.defaults = {

	//	top : ?,

	//	right : ?,

	//	bottom : ?,

	//	left : ?,

	//	width : ?,

	//	height : ?,

		baseNode : '',

		baseX : true,

		baseY : true,

		fixedX : true,

		fixedY : true

	};

	$j.extend($j.ex.fixed.prototype,{

		_attn :[

			{size:'height',pos1:'top',pos2:'bottom'},

			{size:'width',pos1:'left',pos2:'right'}

		],

		_camel :[

			{size:'Height',pos1:'Top',pos2:'Bottom'},

			{size:'Width',pos1:'Left',pos2:'Right'}

		],

		_moveFixedFront : function(){

			var o = this , c = o.config;

			var parents = c.target.parents();

			var containers = parents.filter(function(idx){

				var el = parents.eq(idx);

				return !(/HTML|BODY/i.test(el[0].tagName)) && parents.eq(idx).css('position')!='static';

			});

			if(containers.size())

				containers.eq(containers.size()-1).after(c.target)

			return o;

		},

		_smoothPatch : function(){

			var o = this , c = o.config;

			o._moveFixedFront();

			if( !c.oldBrowser ) return o;

			$j.ex.fixed.config.smoothPatched = true;

			var html = $j('html');

			if(html.css('background-image') == 'none'){

				html.css({'background-image':'url(null)'});

			}

			html.css({'background-attachment':'fixed'});

			return o;

		},

		_eachSize : function( f ){

			var o = this , c = o.config;

			for (var i = 0; i < o._attn.length; i++) {

				var attn = o._attn[i];

				for (var j in attn) {

					var name = attn[j];

					f({

						idx : i,

						name : name,

						camel : name.slice(0,1).toUpperCase() + name.slice(1)

					});

				}

			}

		},

		_eachSizeSet : function( f ){

			var o = this , c = o.config;

			for (var i = 0; i < o._attn.length; i++) {

				f( i , o._attn[i] , o._camel[i] , o._attn[1-i] , o._camel[1-i]);

			}

		},

		_parseSize : function( val , xFlg ){

			var o = this , c = o.config;

			if( val == 'auto' ) return undefined;

			if((val + '').indexOf('%') < 0) return parseInt(val) || 0;

			var cSize = c.container.attr(xFlg ? 'clientWidth' : 'clientHeight');

			return Math.round(cSize * parseInt(val) / 100);

		},

		_parseIntSize : function( val , xFlg ){

			var o = this , c = o.config;

			return parseInt( o._parseSize( val , xFlg ) ) || 0;

		},

		_cleanSize : function(size){

			var o = this , c = o.config;

			var ret = {};

			o._eachSize( function( pa ){

				if(/undefined|auto/i.test(size[pa.name])){

					try{

						delete size[pa.name];

					}

					catch(e){}

				}

				else{

					ret[pa.name] = size[pa.name];

				}

			});

			return ret;	

		},

		_padPos : function( size , pad ){

			var o = this , c = o.config;

			var pos;

			o._eachSizeSet(function(idx , at1 , cm1){

				if (size[at1.pos1] == undefined && size[at1.pos2] == undefined) {

					if( (pos = pad[at1.pos1]) != undefined ) size[at1.pos1] = pos;

					else if( (pos = pad[at1.pos2]) != undefined ) size[at1.pos2] = pos;

					else size[at1.pos1] = 0;

				}

				if(size[at1.size] == undefined){

					if((size[at1.size] = pad[at1.size]) == undefined){

						size[at1.size] = c.target[at1.size]();

					}

				}

			});

			return size;

		},

		_calcRowSize : function( size , opt ){

			var o = this , c = o.config;

			var opt = $j.extend({

				abs : false,

				base : c.baseNode,

				unfixed : false

			},opt);

			var ret = {};



			o._eachSize( function( pa ){

				var val = size[pa.name];

				if(!(/undefined/i.test( val ))){

					ret[pa.name] = o._parseIntSize(val,/width|left|right/i.test(pa.name));

					if (opt.abs && /top|left/i.test(pa.name)){

						ret[pa.name] += c.window['scroll'+pa.camel]();

					}

				}

			});



			if(opt.base){

				var basePos = c.baseNode.offset();

				o._eachSizeSet( function(idx , pa , cm ){

					basePos[pa.pos2] = c.container.attr('client'+cm.size)

						- (basePos[pa.pos1] + c.baseNode['outer'+cm.size]());

				});

				o._eachSize( function( pa ){

					if(!(/height|width/i.test(pa.name)) && ret[pa.name] == undefined

						&& ((!pa.idx && c.baseY) || (pa.idx && c.baseX)) ){

						var name = pa.name == 'top' ? 'bottom' : pa.name == 'bottom' ? 'top' : pa.name == 'left' ? 'right' : 'left';

						ret[name] += basePos[name];

					}

				});

			}



			var fg = opt.unfixed && !c.fixedX ? -1 : 1;

			if(fg == -1|| (!opt.unfixed && !c.fixedY)){

				if(ret.top != undefined)ret.top -= (c.window.scrollTop()*fg);

				if(ret.bottom != undefined)ret.bottom += (c.window.scrollTop()*fg);

			}

			var fg = !opt.unfixed && !c.fixedX ? -1 : 1;

			if(fg == -1|| (opt.unfixed && !c.fixedY) ){

				if(ret.left != undefined )ret.left += (c.window.scrollLeft()*fg);

				if(ret.right != undefined )ret.right -= (c.window.scrollLeft()*fg);

			}

			return ret;

		},

		_fixed : function( size , opt ){
			
			

			var o = this , c = o.config;

			var opt = $j.extend({

				unfixed : false

			},opt);

			if(size) c.logicSize = o._padPos(o._cleanSize(size),c.logicSize);

			if(!c.oldBrowser){

				c.target.css( 

					$.extend(

						c.baseNode || !(c.fixedX && c.fixedY) ? o._calcRowSize( c.logicSize , opt ) : c.logicSize,

						{position:opt.unfixed?'absolute':'fixed'}

					)

				);

			}

			else{

				var rowSize = o._calcRowSize( c.logicSize );

				var hide = false;

				if (c.target.is(':hidden')) {

					hide = true;

					c.target.show();

				}

				o._eachSizeSet( function( idx , pa , cm ){

					c.target.css( pa.size , rowSize[ pa.size ] );

					var pos1 = rowSize[ pa.pos1 ];

					if( pos1 == undefined ){ //right,bottom based

						pos1 = c.container.attr( 'client' + cm.size ) - rowSize[ pa.pos2 ] - c.target[ 'outer' + cm.size ]();

					}

					var over = (pos1 + c.target['outer'+cm.size]()) - c.container.attr('client'+cm.size);

					if (over > 0) {

						over = c.target[pa.size]() - over;

						if (over > 0) 

							c.target[pa.size](over);

						else hide = true;

					}

					if(!hide){

						c.target[0].style.setExpression( pa.pos1 ,

							pos1 +

							(	(!idx && !c.fixedY) || (idx && !c.fixedX) ? 

								c.window['scroll'+cm.pos1]() : 

								'+eval(document.body.scroll'+cm.pos1+'||document.documentElement.scroll'+cm.pos1+')'

							)

						);

					}

				});

				if(hide) c.target.hide();

			}

		},

		target : function(){

			return this.config.target;

		},

		fixedOpen : function( f ){

			var o = this , c = o.config;

			if(c.staticFixed) return;

		

			if (c.oldBrowser) {

				c.target[0].style.removeExpression('top');

				c.target[0].style.removeExpression('left');

			}

			if( f ) setTimeout(function(){ // for window.scrollTop()

				if (c.oldBrowser) {

					c.target.css({top:'auto',left:'auto'});

					c.target.css(o._calcRowSize(c.logicSize , {

						abs : true

					}));

				}

				f();

			},100);

			return o;

		},

		fixedClose : function( size ){

			var o = this , c = o.config;

			if(c.staticFixed) return;

			o._fixed( size );

			return o;

		},

		fixedSize : function( size ){

			var o = this , c = o.config;

			return o._calcRowSize(o._padPos(size,c.logicSize),{

				abs : c.oldBrowser

			});

		},

		resize : function( size ){

			var o = this , c = o.config;

			o.fixedOpen(function(){

				o.fixedClose( size );

			})	

			return o;

		}

	});

	ex.defineExPlugin('exFixed',$j.ex.fixed);



})(jQuery);