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/*

 * File:        ColReorder.js

 * Version:     1.0.2

 * CVS:         $Id$

 * Description: Controls for column visiblity in DataTables

 * Author:      Allan Jardine (www.sprymedia.co.uk)

 * Created:     Wed Sep 15 18:23:29 BST 2010

 * Modified:    $Date$ by $Author$

 * Language:    Javascript

 * License:     GPL v2 or BSD 3 point style

 * Project:     DataTables

 * Contact:     www.sprymedia.co.uk/contact

 * 

 * Copyright 2010-2011 Allan Jardine, all rights reserved.

 *

 * This source file is free software, under either the GPL v2 license or a

 * BSD style license, available at:

 *   http://datatables.net/license_gpl2

 *   http://datatables.net/license_bsd

 *

 */

(function($, window, document) {

/**

 * Switch the key value pairing of an index array to be value key (i.e. the old value is now the

 * key). For example consider [ 2, 0, 1 ] this would be returned as [ 1, 2, 0 ].

 *  @method  fnInvertKeyValues

 *  @param   array aIn Array to switch around

 *  @returns array

 */

function fnInvertKeyValues( aIn )

{

	var aRet=[];

	for ( var i=0, iLen=aIn.length ; i<iLen ; i++ )

	{

		aRet[ aIn[i] ] = i;

	}

	return aRet;

}

/**

 * Modify an array by switching the position of two elements

 *  @method  fnArraySwitch

 *  @param   array aArray Array to consider, will be modified by reference (i.e. no return)

 *  @param   int iFrom From point

 *  @param   int iTo Insert point

 *  @returns void

 */

function fnArraySwitch( aArray, iFrom, iTo )

{

	var mStore = aArray.splice( iFrom, 1 )[0];

	aArray.splice( iTo, 0, mStore );

}

/**

 * Switch the positions of nodes in a parent node (note this is specifically designed for 

 * table rows). Note this function considers all element nodes under the parent!

 *  @method  fnDomSwitch

 *  @param   string sTag Tag to consider

 *  @param   int iFrom Element to move

 *  @param   int Point to element the element to (before this point), can be null for append

 *  @returns void

 */

function fnDomSwitch( nParent, iFrom, iTo )

{

	var anTags = [];

	for ( var i=0, iLen=nParent.childNodes.length ; i<iLen ; i++ )

	{

		if ( nParent.childNodes[i].nodeType == 1 )

		{

			anTags.push( nParent.childNodes[i] );

		}

	}

	var nStore = anTags[ iFrom ];

	if ( iTo !== null )

	{

		nParent.insertBefore( nStore, anTags[iTo] );

	}

	else

	{

		nParent.appendChild( nStore );

	}

}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

 * DataTables plug-in API functions

 *

 * This are required by ColReorder in order to perform the tasks required, and also keep this

 * code portable, to be used for other column reordering projects with DataTables, if needed.

 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**

 * Plug-in for DataTables which will reorder the internal column structure by taking the column

 * from one position (iFrom) and insert it into a given point (iTo).

 *  @method  $.fn.dataTableExt.oApi.fnColReorder

 *  @param   object oSettings DataTables settings object - automatically added by DataTables! 

 *  @param   int iFrom Take the column to be repositioned from this point

 *  @param   int iTo and insert it into this point

 *  @returns void

 */

$.fn.dataTableExt.oApi.fnColReorder = function ( oSettings, iFrom, iTo )

{

	var i, iLen, j, jLen, iCols=oSettings.aoColumns.length, nTrs;

	/* Sanity check in the input */

	if ( iFrom == iTo )

	{

		/* Pointless reorder */

		return;

	}

	if ( iFrom < 0 || iFrom >= iCols )

	{

		this.oApi._fnLog( oSettings, 1, "ColReorder 'from' index is out of bounds: "+iFrom );

		return;

	}

	if ( iTo < 0 || iTo >= iCols )

	{

		this.oApi._fnLog( oSettings, 1, "ColReorder 'to' index is out of bounds: "+iTo );

		return;

	}

	/*

	 * Calculate the new column array index, so we have a mapping between the old and new

	 */

	var aiMapping = [];

	for ( i=0, iLen=iCols ; i<iLen ; i++ )

	{

		aiMapping[i] = i;

	}

	fnArraySwitch( aiMapping, iFrom, iTo );

	var aiInvertMapping = fnInvertKeyValues( aiMapping );

	/*

	 * Convert all internal indexing to the new column order indexes

	 */

	/* Sorting */

	for ( i=0, iLen=oSettings.aaSorting.length ; i<iLen ; i++ )

	{

		oSettings.aaSorting[i][0] = aiInvertMapping[ oSettings.aaSorting[i][0] ];

	}

	/* Fixed sorting */

	if ( oSettings.aaSortingFixed !== null )

	{

		for ( i=0, iLen=oSettings.aaSortingFixed.length ; i<iLen ; i++ )

		{

			oSettings.aaSortingFixed[i][0] = aiInvertMapping[ oSettings.aaSortingFixed[i][0] ];

		}

	}

	/* Data column sorting (the column which the sort for a given column should take place on) */

	for ( i=0, iLen=iCols ; i<iLen ; i++ )

	{

		oSettings.aoColumns[i].iDataSort = aiInvertMapping[ oSettings.aoColumns[i].iDataSort ];

	}

	/*

	 * Move the DOM elements

	 */

	if ( oSettings.aoColumns[iFrom].bVisible )

	{

		/* Calculate the current visible index and the point to insert the node before. The insert

		 * before needs to take into account that there might not be an element to insert before,

		 * in which case it will be null, and an appendChild should be used

		 */

		var iVisibleIndex = this.oApi._fnColumnIndexToVisible( oSettings, iFrom );

		var iInsertBeforeIndex = null;

		i = iTo < iFrom ? iTo : iTo + 1;

		while ( iInsertBeforeIndex === null && i < iCols )

		{

			iInsertBeforeIndex = this.oApi._fnColumnIndexToVisible( oSettings, i );

			i++;

		}

		/* Header */

		nTrs = oSettings.nTHead.getElementsByTagName('tr');

		for ( i=0, iLen=nTrs.length ; i<iLen ; i++ )

		{

			fnDomSwitch( nTrs[i], iVisibleIndex, iInsertBeforeIndex );

		}

		/* Footer */

		if ( oSettings.nTFoot !== null )

		{

			nTrs = oSettings.nTFoot.getElementsByTagName('tr');

			for ( i=0, iLen=nTrs.length ; i<iLen ; i++ )

			{

				fnDomSwitch( nTrs[i], iVisibleIndex, iInsertBeforeIndex );

			}

		}

		/* Body */

		for ( i=0, iLen=oSettings.aoData.length ; i<iLen ; i++ )

		{

			fnDomSwitch( oSettings.aoData[i].nTr, iVisibleIndex, iInsertBeforeIndex );

		}

	}

	/* 

	 * Move the internal array elements

	 */

	/* Columns */

	fnArraySwitch( oSettings.aoColumns, iFrom, iTo );

	/* Search columns */

	fnArraySwitch( oSettings.aoPreSearchCols, iFrom, iTo );

	/* Array array - internal data anodes cache */

	for ( i=0, iLen=oSettings.aoData.length ; i<iLen ; i++ )

	{

		if ( $.isArray( oSettings.aoData[i]._aData ) ) {

		  fnArraySwitch( oSettings.aoData[i]._aData, iFrom, iTo );

		}

		fnArraySwitch( oSettings.aoData[i]._anHidden, iFrom, iTo );

	}

	/* Reposition the header elements in the header layout array */

	for ( i=0, iLen=oSettings.aoHeader.length ; i<iLen ; i++ )

	{

		fnArraySwitch( oSettings.aoHeader[i], iFrom, iTo );

	}

	if ( oSettings.aoFooter !== null )

	{

		for ( i=0, iLen=oSettings.aoFooter.length ; i<iLen ; i++ )

		{

			fnArraySwitch( oSettings.aoFooter[i], iFrom, iTo );

		}

	}

	/*

	 * Update DataTables' event handlers

	 */

	/* Sort listener */

	for ( i=0, iLen=iCols ; i<iLen ; i++ )

	{

		$(oSettings.aoColumns[i].nTh).unbind('click');

		this.oApi._fnSortAttachListener( oSettings, oSettings.aoColumns[i].nTh, i );

	}

	/*

	 * Any extra operations for the other plug-ins

	 */

	if ( typeof ColVis != 'undefined' )

	{

		ColVis.fnRebuild( oSettings.oInstance );

	}

	if ( typeof oSettings.oInstance._oPluginFixedHeader != 'undefined' )

	{

		oSettings.oInstance._oPluginFixedHeader.fnUpdate();

	}

};

/** 

 * ColReorder provides column visiblity control for DataTables

 * @class ColReorder

 * @constructor

 * @param {object} DataTables object

 * @param {object} ColReorder options

 */

ColReorder = function( oTable, oOpts )

{

	/* Santiy check that we are a new instance */

	if ( !this.CLASS || this.CLASS != "ColReorder" )

	{

		alert( "Warning: ColReorder must be initialised with the keyword 'new'" );

	}

	if ( typeof oOpts == 'undefined' )

	{

		oOpts = {};

	}

	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

	 * Public class variables

	 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

	/**

	 * @namespace Settings object which contains customisable information for ColReorder instance

	 */

	this.s = {

		/**

		 * DataTables settings object

		 *  @property dt

		 *  @type     Object

		 *  @default  null

		 */

		"dt": null,

		/**

		 * Initialisation object used for this instance

		 *  @property init

		 *  @type     object

		 *  @default  {}

		 */

		"init": oOpts,

		/**

		 * Number of columns to fix (not allow to be reordered)

		 *  @property fixed

		 *  @type     int

		 *  @default  0

		 */

		"fixed": 0,

		/**

		 * @namespace Information used for the mouse drag

		 */

		"mouse": {

			"startX": -1,

			"startY": -1,

			"offsetX": -1,

			"offsetY": -1,

			"target": -1,

			"targetIndex": -1,

			"fromIndex": -1

		},

		/**

		 * Information which is used for positioning the insert cusor and knowing where to do the

		 * insert. Array of objects with the properties:

		 *   x: x-axis position

		 *   to: insert point

		 *  @property aoTargets

		 *  @type     array

		 *  @default  []

		 */

		"aoTargets": []

	};

	/**

	 * @namespace Common and useful DOM elements for the class instance

	 */

	this.dom = {

		/**

		 * Dragging element (the one the mouse is moving)

		 *  @property drag

		 *  @type     element

		 *  @default  null

		 */

		"drag": null,

		/**

		 * The insert cursor

		 *  @property pointer

		 *  @type     element

		 *  @default  null

		 */

		"pointer": null

	};

	/* Constructor logic */

	this.s.dt = oTable.fnSettings();

	this._fnConstruct();

	/* Store the instance for later use */

	ColReorder.aoInstances.push( this );

	return this;

};

ColReorder.prototype = {

	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

	 * Public methods

	 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

	"fnReset": function ()

	{

		var a = [];

		for ( var i=0, iLen=this.s.dt.aoColumns.length ; i<iLen ; i++ )

		{

			a.push( this.s.dt.aoColumns[i]._ColReorder_iOrigCol );

		}

		this._fnOrderColumns( a );

	},

	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

	 * Private methods (they are of course public in JS, but recommended as private)

	 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

	/**

	 * Constructor logic

	 *  @method  _fnConstruct

	 *  @returns void

	 *  @private 

	 */

	"_fnConstruct": function ()

	{

		var that = this;

		var i, iLen;

		/* Columns discounted from reordering - counting left to right */

		if ( typeof this.s.init.iFixedColumns != 'undefined' )

		{

			this.s.fixed = this.s.init.iFixedColumns;

		}

		/* Add event handlers for the drag and drop, and also mark the original column order */

		for ( i=0, iLen=this.s.dt.aoColumns.length ; i<iLen ; i++ )

		{

			if ( i > this.s.fixed-1 )

			{

				this._fnMouseListener( i, this.s.dt.aoColumns[i].nTh );

			}

			/* Mark the original column order for later reference */

			this.s.dt.aoColumns[i]._ColReorder_iOrigCol = i;

		}

		/* State saving */

		this.s.dt.aoStateSave.push( {

			"fn": function (oS, sVal) {

				return that._fnStateSave.call( that, sVal );

			},

			"sName": "ColReorder_State"

		} );

		/* An initial column order has been specified */

		var aiOrder = null;

		if ( typeof this.s.init.aiOrder != 'undefined' )

		{

			aiOrder = this.s.init.aiOrder.slice();

		}

		/* State loading, overrides the column order given */

		if ( this.s.dt.oLoadedState && typeof this.s.dt.oLoadedState.ColReorder != 'undefined' &&

		  this.s.dt.oLoadedState.ColReorder.length == this.s.dt.aoColumns.length )

		{

			aiOrder = this.s.dt.oLoadedState.ColReorder;

		}

		/* If we have an order to apply - do so */

		if ( aiOrder )

		{

			/* We might be called during or after the DataTables initialisation. If before, then we need

			 * to wait until the draw is done, if after, then do what we need to do right away

			 */

			if ( !that.s.dt._bInitComplete )

			{

				var bDone = false;

				this.s.dt.aoDrawCallback.push( {

					"fn": function () {

						if ( !that.s.dt._bInitComplete && !bDone )

						{

							bDone = true;

							var resort = fnInvertKeyValues( aiOrder );

							that._fnOrderColumns.call( that, resort );

						}

					},

					"sName": "ColReorder_Pre"

				} );

			}

			else

			{

				var resort = fnInvertKeyValues( aiOrder );

				that._fnOrderColumns.call( that, resort );

			}

		}

	},

	/**

	 * Set the column order from an array

	 *  @method  _fnOrderColumns

	 *  @param   array a An array of integers which dictate the column order that should be applied

	 *  @returns void

	 *  @private 

	 */

	"_fnOrderColumns": function ( a )

	{

		if ( a.length != this.s.dt.aoColumns.length )

		{

			this.s.dt.oInstance.oApi._fnLog( oDTSettings, 1, "ColReorder - array reorder does not "+

			 	"match known number of columns. Skipping." );

			return;

		}

		for ( var i=0, iLen=a.length ; i<iLen ; i++ )

		{

			var currIndex = $.inArray( i, a );

			if ( i != currIndex )

			{

				/* Reorder our switching array */

				fnArraySwitch( a, currIndex, i );

				/* Do the column reorder in the table */

				this.s.dt.oInstance.fnColReorder( currIndex, i );

			}

		}

		/* When scrolling we need to recalculate the column sizes to allow for the shift */

		if ( this.s.dt.oScroll.sX !== "" || this.s.dt.oScroll.sY !== "" )

		{

			this.s.dt.oInstance.fnAdjustColumnSizing();

		}

		/* Save the state */

		this.s.dt.oInstance.oApi._fnSaveState( this.s.dt );

	},

	/**

	 * This function effectively replaces the state saving function in DataTables (this is needed

	 * because otherwise DataTables would state save the columns in their reordered state, not the

	 * original which is needed on first draw). This is sensitive to any changes in the DataTables

	 * state saving method!

	 *  @method  _fnStateSave

	 *  @param   string sCurrentVal 

	 *  @returns string JSON encoded cookie string for DataTables

	 *  @private 

	 */

	"_fnStateSave": function ( sCurrentVal )

	{

		var i, iLen, sTmp;

		var sValue = sCurrentVal.split('"aaSorting"')[0];

		var a = [];

		var oSettings = this.s.dt;

		/* Sorting */

		sValue += '"aaSorting":[ ';

		for ( i=0 ; i<oSettings.aaSorting.length ; i++ )

		{

			sValue += '['+oSettings.aoColumns[ oSettings.aaSorting[i][0] ]._ColReorder_iOrigCol+

				',"'+oSettings.aaSorting[i][1]+'"],';

		}

		sValue = sValue.substring(0, sValue.length-1);

		sValue += "],";

		/* Column filter */

		for ( i=0, iLen=oSettings.aoColumns.length ; i<iLen ; i++ )

		{

			a[ oSettings.aoColumns[i]._ColReorder_iOrigCol ] = {

				"sSearch": encodeURIComponent(oSettings.aoPreSearchCols[i].sSearch),

				"bRegex": !oSettings.aoPreSearchCols[i].bRegex

			};

		}

		sValue += '"aaSearchCols":[ ';

		for ( i=0 ; i<a.length ; i++ )

		{

			sValue += '["'+a[i].sSearch+'",'+a[i].bRegex+'],';

		}

		sValue = sValue.substring(0, sValue.length-1);

		sValue += "],";

		/* Visibility */

		a = [];

		for ( i=0, iLen=oSettings.aoColumns.length ; i<iLen ; i++ )

		{

			a[ oSettings.aoColumns[i]._ColReorder_iOrigCol ] = oSettings.aoColumns[i].bVisible;

		}

		sValue += '"abVisCols":[ ';

		for ( i=0 ; i<a.length ; i++ )

		{

			sValue += a[i]+",";

		}

		sValue = sValue.substring(0, sValue.length-1);

		sValue += "],";

		/* Column reordering */

		a = [];

		for ( i=0, iLen=oSettings.aoColumns.length ; i<iLen ; i++ ) {

			a.push( oSettings.aoColumns[i]._ColReorder_iOrigCol );

		}

		sValue += '"ColReorder":['+a.join(',')+']';

		return sValue;

	},

	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

	 * Mouse drop and drag

	 */

	/**

	 * Add a mouse down listener to a particluar TH element

	 *  @method  _fnMouseListener

	 *  @param   int i Column index

	 *  @param   element nTh TH element clicked on

	 *  @returns void

	 *  @private 

	 */

	"_fnMouseListener": function ( i, nTh )

	{

		var that = this;

		$(nTh).bind( 'mousedown.ColReorder', function (e) {

			that._fnMouseDown.call( that, e, nTh );

			return false;

		} );

	},

	/**

	 * Mouse down on a TH element in the table header

	 *  @method  _fnMouseDown

	 *  @param   event e Mouse event

	 *  @param   element nTh TH element to be dragged

	 *  @returns void

	 *  @private 

	 */

	"_fnMouseDown": function ( e, nTh )

	{

		var

			that = this,

			aoColumns = this.s.dt.aoColumns;

		/* Store information about the mouse position */

		var nThTarget = e.target.nodeName == "TH" ? e.target : $(e.target).parents('TH')[0];

		var offset = $(nThTarget).offset();

		this.s.mouse.startX = e.pageX;

		this.s.mouse.startY = e.pageY;

		this.s.mouse.offsetX = e.pageX - offset.left;

		this.s.mouse.offsetY = e.pageY - offset.top;

		this.s.mouse.target = nTh;

		this.s.mouse.targetIndex = $('th', nTh.parentNode).index( nTh );

		this.s.mouse.fromIndex = this.s.dt.oInstance.oApi._fnVisibleToColumnIndex( this.s.dt, 

			this.s.mouse.targetIndex );

		/* Calculate a cached array with the points of the column inserts, and the 'to' points */

		this.s.aoTargets.splice( 0, this.s.aoTargets.length );

		this.s.aoTargets.push( {

			"x":  $(this.s.dt.nTable).offset().left,

			"to": 0

		} );

		var iToPoint = 0;

		for ( var i=0, iLen=aoColumns.length ; i<iLen ; i++ )

		{

			/* For the column / header in question, we want it's position to remain the same if the 

			 * position is just to it's immediate left or right, so we only incremement the counter for

			 * other columns

			 */

			if ( i != this.s.mouse.fromIndex )

			{

				iToPoint++;

			}

			if ( aoColumns[i].bVisible )

			{

				this.s.aoTargets.push( {

					"x":  $(aoColumns[i].nTh).offset().left + $(aoColumns[i].nTh).outerWidth(),

					"to": iToPoint

				} );

			}

		}

		/* Disallow columns for being reordered by drag and drop, counting left to right */

		if ( this.s.fixed !== 0 )

		{

			this.s.aoTargets.splice( 0, this.s.fixed );

		}

		/* Add event handlers to the document */

		$(document).bind( 'mousemove.ColReorder', function (e) {

			that._fnMouseMove.call( that, e );

		} );

		$(document).bind( 'mouseup.ColReorder', function (e) {

			that._fnMouseUp.call( that, e );

		} );

	},

	/**

	 * Deal with a mouse move event while dragging a node

	 *  @method  _fnMouseMove

	 *  @param   event e Mouse event

	 *  @returns void

	 *  @private 

	 */

	"_fnMouseMove": function ( e )

	{

		var that = this;

		if ( this.dom.drag === null )

		{

			/* Only create the drag element if the mouse has moved a specific distance from the start

			 * point - this allows the user to make small mouse movements when sorting and not have a

			 * possibly confusing drag element showing up

			 */

			if ( Math.pow(

				Math.pow(e.pageX - this.s.mouse.startX, 2) + 

				Math.pow(e.pageY - this.s.mouse.startY, 2), 0.5 ) < 5 )

			{

				return;

			}

			this._fnCreateDragNode();

		}

		/* Position the element - we respect where in the element the click occured */

		this.dom.drag.style.left = (e.pageX - this.s.mouse.offsetX) + "px";

		this.dom.drag.style.top = (e.pageY - this.s.mouse.offsetY) + "px";

		/* Based on the current mouse position, calculate where the insert should go */

		var bSet = false;

		for ( var i=1, iLen=this.s.aoTargets.length ; i<iLen ; i++ )

		{

			if ( e.pageX < this.s.aoTargets[i-1].x + ((this.s.aoTargets[i].x-this.s.aoTargets[i-1].x)/2) )

			{

				this.dom.pointer.style.left = this.s.aoTargets[i-1].x +"px";

				this.s.mouse.toIndex = this.s.aoTargets[i-1].to;

				bSet = true;

				break;

			}

		}

		/* The insert element wasn't positioned in the array (less than operator), so we put it at 

		 * the end

		 */

		if ( !bSet )

		{

			this.dom.pointer.style.left = this.s.aoTargets[this.s.aoTargets.length-1].x +"px";

			this.s.mouse.toIndex = this.s.aoTargets[this.s.aoTargets.length-1].to;

		}

	},

	/**

	 * Finish off the mouse drag and insert the column where needed

	 *  @method  _fnMouseUp

	 *  @param   event e Mouse event

	 *  @returns void

	 *  @private 

	 */

	"_fnMouseUp": function ( e )

	{

		var that = this;

		$(document).unbind( 'mousemove.ColReorder' );

		$(document).unbind( 'mouseup.ColReorder' );

		if ( this.dom.drag !== null )

		{

			/* Remove the guide elements */

			document.body.removeChild( this.dom.drag );

			document.body.removeChild( this.dom.pointer );

			this.dom.drag = null;

			this.dom.pointer = null;

			/* Actually do the reorder */

			this.s.dt.oInstance.fnColReorder( this.s.mouse.fromIndex, this.s.mouse.toIndex );

			/* When scrolling we need to recalculate the column sizes to allow for the shift */

			if ( this.s.dt.oScroll.sX !== "" || this.s.dt.oScroll.sY !== "" )

			{

				this.s.dt.oInstance.fnAdjustColumnSizing();

			}

			/* Save the state */

			this.s.dt.oInstance.oApi._fnSaveState( this.s.dt );

		}

	},

	/**

	 * Copy the TH element that is being drags so the user has the idea that they are actually 

	 * moving it around the page.

	 *  @method  _fnCreateDragNode

	 *  @returns void

	 *  @private 

	 */

	"_fnCreateDragNode": function ()

	{

		var that = this;

		this.dom.drag = $(this.s.dt.nTHead.parentNode).clone(true)[0];

		this.dom.drag.className += " DTCR_clonedTable";

		while ( this.dom.drag.getElementsByTagName('tbody').length > 0 )

		{

			this.dom.drag.removeChild( this.dom.drag.getElementsByTagName('tbody')[0] );

		}

		while ( this.dom.drag.getElementsByTagName('tfoot').length > 0 )

		{

			this.dom.drag.removeChild( this.dom.drag.getElementsByTagName('tfoot')[0] );

		}

		$('thead tr:eq(0)', this.dom.drag).each( function () {

			$('th:not(:eq('+that.s.mouse.targetIndex+'))', this).remove();

		} );

		$('tr', this.dom.drag).height( $('tr:eq(0)', that.s.dt.nTHead).height() );

		$('thead tr:gt(0)', this.dom.drag).remove();

		$('thead th:eq(0)', this.dom.drag).each( function (i) {

			this.style.width = $('th:eq('+that.s.mouse.targetIndex+')', that.s.dt.nTHead).width()+"px";

		} );

		this.dom.drag.style.position = "absolute";

		this.dom.drag.style.top = "0px";

		this.dom.drag.style.left = "0px";

		this.dom.drag.style.width = $('th:eq('+that.s.mouse.targetIndex+')', that.s.dt.nTHead).outerWidth()+"px";

		this.dom.pointer = document.createElement( 'div' );

		this.dom.pointer.className = "DTCR_pointer";

		this.dom.pointer.style.position = "absolute";

		if ( this.s.dt.oScroll.sX === "" && this.s.dt.oScroll.sY === "" )

		{

			this.dom.pointer.style.top = $(this.s.dt.nTable).offset().top+"px";

			this.dom.pointer.style.height = $(this.s.dt.nTable).height()+"px";

		}

		else

		{

			this.dom.pointer.style.top = $('div.dataTables_scroll', this.s.dt.nTableWrapper).offset().top+"px";

			this.dom.pointer.style.height = $('div.dataTables_scroll', this.s.dt.nTableWrapper).height()+"px";

		}

		document.body.appendChild( this.dom.pointer );

		document.body.appendChild( this.dom.drag );

	}

};

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

 * Static parameters

 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**

 * Array of all ColReorder instances for later reference

 *  @property ColReorder.aoInstances

 *  @type     array

 *  @default  []

 *  @static

 */

ColReorder.aoInstances = [];

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

 * Static functions

 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**

 * Reset the column ordering for a DataTables instance

 *  @method  ColReorder.fnReset

 *  @param   object oTable DataTables instance to consider

 *  @returns void

 *  @static

 */

ColReorder.fnReset = function ( oTable )

{

	for ( var i=0, iLen=ColReorder.aoInstances.length ; i<iLen ; i++ )

	{

		if ( ColReorder.aoInstances[i].s.dt.oInstance == oTable )

		{

			ColReorder.aoInstances[i].fnReset();

		}

	}

};

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

 * Constants

 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**

 * Name of this class

 *  @constant CLASS

 *  @type     String

 *  @default  ColReorder

 */

ColReorder.prototype.CLASS = "ColReorder";

/**

 * ColReorder version

 *  @constant  VERSION

 *  @type      String

 *  @default   1.0.2

 */

ColReorder.VERSION = "1.0.2";

ColReorder.prototype.VERSION = ColReorder.VERSION;

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

 * Initialisation

 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*

 * Register a new feature with DataTables

 */

if ( typeof $.fn.dataTable == "function" &&

     typeof $.fn.dataTableExt.fnVersionCheck == "function" &&

     $.fn.dataTableExt.fnVersionCheck('1.8.0') )

{

	$.fn.dataTableExt.aoFeatures.push( {

		"fnInit": function( oDTSettings ) {

			var oTable = oDTSettings.oInstance;

			if ( typeof oTable._oPluginColReorder == 'undefined' ) {

				var opts = typeof oDTSettings.oInit.oColReorder != 'undefined' ? 

					oDTSettings.oInit.oColReorder : {};

				oTable._oPluginColReorder = new ColReorder( oDTSettings.oInstance, opts );

			} else {

				oTable.oApi._fnLog( oDTSettings, 1, "ColReorder attempted to initialise twice. Ignoring second" );

			}

			return null; /* No node to insert */

		},

		"cFeature": "R",

		"sFeature": "ColReorder"

	} );

}

else

{

	alert( "Warning: ColReorder requires DataTables 1.8.0 or greater - www.datatables.net/download");

}

})(jQuery, window, document);