/*
 * File:        ColVis.js
 * Version:     1.1.0-dev
 * 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:     Just a little bit of fun :-)
 * 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($) {

/**
 * ColVis provides column visiblity control for DataTables
 * @class ColVis
 * @constructor
 * @param {object} DataTables settings object
 */
var ColVis = function( oDTSettings, oInit )
{
	/* Santiy check that we are a new instance */
	if ( !this.CLASS || this.CLASS != "ColVis" )
	{
		alert( "Warning: ColVis must be initialised with the keyword 'new'" );
	}
	
	if ( typeof oInit == 'undefined' )
	{
		oInit = {};
	}
	
	
	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 * Public class variables
	 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
	
	/**
	 * @namespace Settings object which contains customisable information for ColVis instance
	 */
	this.s = {
		/**
		 * DataTables settings object
		 *  @property dt
		 *  @type     Object
		 *  @default  null
		 */
		"dt": null,
		
		/**
		 * Customisation object
		 *  @property oInit
		 *  @type     Object
		 *  @default  passed in
		 */
		"oInit": oInit,
		
		/**
		 * Callback function to tell the user when the state has changed
		 *  @property fnStateChange
		 *  @type     function
		 *  @default  null
		 */
		"fnStateChange": null,
		
		/**
		 * Mode of activation. Can be 'click' or 'mouseover'
		 *  @property activate
		 *  @type     String
		 *  @default  click
		 */
		"activate": "click",
		
		/**
		 * Position of the collection menu when shown - align "left" or "right"
		 *  @property sAlign
		 *  @type     String
		 *  @default  right
		 */
		"sAlign": "left",
		
		/**
		 * Text used for the button
		 *  @property buttonText
		 *  @type     String
		 *  @default  Show / hide columns
		 */
		"buttonText": "Show / hide columns",
		
		/**
		 * Flag to say if the collection is hidden
		 *  @property hidden
		 *  @type     boolean
		 *  @default  true
		 */
		"hidden": true,
		
		/**
		 * List of columns (integers) which should be excluded from the list
		 *  @property aiExclude
		 *  @type     Array
		 *  @default  []
		 */
		"aiExclude": [],
		
		/**
		 * Group buttons
		 *  @property aoGroups
		 *  @type     Array
		 *  @default  []
		 */
		"aoGroups": [],
		
		/**
		 * Store the original viisbility settings so they could be restored
		 *  @property abOriginal
		 *  @type     Array
		 *  @default  []
		 */
		"abOriginal": [],
		
		/**
		 * Show Show-All button
		 *  @property bShowAll
		 *  @type     Array
		 *  @default  []
		 */
		"bShowAll": false,
		
		/**
		 * Show All button text
		 *  @property sShowAll
		 *  @type     String
		 *  @default  Restore original
		 */
		"sShowAll": "Show All",
		
		/**
		 * Show restore button
		 *  @property bRestore
		 *  @type     Array
		 *  @default  []
		 */
		"bRestore": false,
		
		/**
		 * Restore button text
		 *  @property sRestore
		 *  @type     String
		 *  @default  Restore original
		 */
		"sRestore": "Restore original",
		
		/**
		 * Overlay animation duration in mS
		 *  @property iOverlayFade
		 *  @type     Integer
		 *  @default  500
		 */
		"iOverlayFade": 500,
		
		/**
		 * Label callback for column names. Takes three parameters: 1. the column index, 2. the column
		 * title detected by DataTables and 3. the TH node for the column
		 *  @property fnLabel
		 *  @type     Function
		 *  @default  null
		 */
		"fnLabel": null,
		
		/**
		 * Indicate if ColVis should automatically calculate the size of buttons or not. The default
		 * is for it to do so. Set to "css" to disable the automatic sizing
		 *  @property sSize
		 *  @type     String
		 *  @default  auto
		 */
		"sSize": "auto",
		
		/**
		 * Indicate if the column list should be positioned by Javascript, visually below the button
		 * or allow CSS to do the positioning
		 *  @property bCssPosition
		 *  @type     boolean
		 *  @default  false
		 */
		"bCssPosition": false
	};
	
	
	/**
	 * @namespace Common and useful DOM elements for the class instance
	 */
	this.dom = {
		/**
		 * Wrapper for the button - given back to DataTables as the node to insert
		 *  @property wrapper
		 *  @type     Node
		 *  @default  null
		 */
		"wrapper": null,
		
		/**
		 * Activation button
		 *  @property button
		 *  @type     Node
		 *  @default  null
		 */
		"button": null,
		
		/**
		 * Collection list node
		 *  @property collection
		 *  @type     Node
		 *  @default  null
		 */
		"collection": null,
		
		/**
		 * Background node used for shading the display and event capturing
		 *  @property background
		 *  @type     Node
		 *  @default  null
		 */
		"background": null,
		
		/**
		 * Element to position over the activation button to catch mouse events when using mouseover
		 *  @property catcher
		 *  @type     Node
		 *  @default  null
		 */
		"catcher": null,
		
		/**
		 * List of button elements
		 *  @property buttons
		 *  @type     Array
		 *  @default  []
		 */
		"buttons": [],
		
		/**
		 * List of group button elements
		 *  @property groupButtons
		 *  @type     Array
		 *  @default  []
		 */
		"groupButtons": [],

		/**
		 * Restore button
		 *  @property restore
		 *  @type     Node
		 *  @default  null
		 */
		"restore": null
	};
	
	/* Store global reference */
	ColVis.aInstances.push( this );
	
	/* Constructor logic */
	this.s.dt = oDTSettings;
	this._fnConstruct();
	return this;
};



ColVis.prototype = {
	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 * Public methods
	 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
	
	/**
	 * Rebuild the list of buttons for this instance (i.e. if there is a column header update)
	 *  @method  fnRebuild
	 *  @returns void
	 */
	"fnRebuild": function ()
	{
		/* Remove the old buttons */
		for ( var i=this.dom.buttons.length-1 ; i>=0 ; i-- )
		{
			if ( this.dom.buttons[i] !== null )
			{
				this.dom.collection.removeChild( this.dom.buttons[i] );
			}
		}
		this.dom.buttons.splice( 0, this.dom.buttons.length );
		
		if ( this.dom.restore )
		{
			this.dom.restore.parentNode( this.dom.restore );
		}
		
		/* Re-add them (this is not the optimal way of doing this, it is fast and effective) */
		this._fnAddGroups();
		this._fnAddButtons();
		
		/* Update the checkboxes */
		this._fnDrawCallback();
	},
	
	
	
	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 * Private methods (they are of course public in JS, but recommended as private)
	 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
	
	/**
	 * Constructor logic
	 *  @method  _fnConstruct
	 *  @returns void
	 *  @private
	 */
	"_fnConstruct": function ()
	{
		this._fnApplyCustomisation();
		
		var that = this;
		var i, iLen;
		this.dom.wrapper = document.createElement('div');
		this.dom.wrapper.className = "ColVis TableTools";
		
		this.dom.button = this._fnDomBaseButton( this.s.buttonText );
		this.dom.button.className += " ColVis_MasterButton";
		this.dom.wrapper.appendChild( this.dom.button );
		
		this.dom.catcher = this._fnDomCatcher();
		this.dom.collection = this._fnDomCollection();
		this.dom.background = this._fnDomBackground();
		
		this._fnAddGroups();
		this._fnAddButtons();
		
		/* Store the original visbility information */
		for ( i=0, iLen=this.s.dt.aoColumns.length ; i<iLen ; i++ )
		{
			this.s.abOriginal.push( this.s.dt.aoColumns[i].bVisible );
		}
		
		/* Update on each draw */
		this.s.dt.aoDrawCallback.push( {
			"fn": function () {
				that._fnDrawCallback.call( that );
			},
			"sName": "ColVis"
		} );

		/* If columns are reordered, then we need to update our exclude list and
		 * rebuild the displayed list
		 */
		$(this.s.dt.oInstance).bind( 'column-reorder', function ( e, oSettings, oReorder ) {
			for ( i=0, iLen=that.s.aiExclude.length ; i<iLen ; i++ ) {
				that.s.aiExclude[i] = oReorder.aiInvertMapping[ that.s.aiExclude[i] ];
			}

			var mStore = that.s.abOriginal.splice( oReorder.iFrom, 1 )[0];
			that.s.abOriginal.splice( oReorder.iTo, 0, mStore );
			
			that.fnRebuild();
		} );
	},
	
	
	/**
	 * Apply any customisation to the settings from the DataTables initialisation
	 *  @method  _fnApplyCustomisation
	 *  @returns void
	 *  @private
	 */
	"_fnApplyCustomisation": function ()
	{
		var oConfig = this.s.oInit;
		
		if ( typeof oConfig.activate != 'undefined' )
		{
			this.s.activate = oConfig.activate;
		}
		
		if ( typeof oConfig.buttonText != 'undefined' )
		{
			this.s.buttonText = oConfig.buttonText;
		}
		
		if ( typeof oConfig.aiExclude != 'undefined' )
		{
			this.s.aiExclude = oConfig.aiExclude;
		}
		
		if ( typeof oConfig.bRestore != 'undefined' )
		{
			this.s.bRestore = oConfig.bRestore;
		}
		
		if ( typeof oConfig.sRestore != 'undefined' )
		{
			this.s.sRestore = oConfig.sRestore;
		}
		
		if ( typeof oConfig.bShowAll != 'undefined' )
		{
			this.s.bShowAll = oConfig.bShowAll;
		}
		
		if ( typeof oConfig.sShowAll != 'undefined' )
		{
			this.s.sShowAll = oConfig.sShowAll;
		}
		
		if ( typeof oConfig.sAlign != 'undefined' )
		{
			this.s.sAlign = oConfig.sAlign;
		}
		
		if ( typeof oConfig.fnStateChange != 'undefined' )
		{
			this.s.fnStateChange = oConfig.fnStateChange;
		}
		
		if ( typeof oConfig.iOverlayFade != 'undefined' )
		{
			this.s.iOverlayFade = oConfig.iOverlayFade;
		}
		
		if ( typeof oConfig.fnLabel != 'undefined' )
		{
			this.s.fnLabel = oConfig.fnLabel;
		}
		
		if ( typeof oConfig.sSize != 'undefined' )
		{
			this.s.sSize = oConfig.sSize;
		}

		if ( typeof oConfig.bCssPosition != 'undefined' )
		{
			this.s.bCssPosition = oConfig.bCssPosition;
		}

		if ( typeof oConfig.aoGroups != 'undefined' )
		{
			this.s.aoGroups = oConfig.aoGroups;
		}
	},
	
	
	/**
	 * On each table draw, check the visibility checkboxes as needed. This allows any process to
	 * update the table's column visibility and ColVis will still be accurate.
	 *  @method  _fnDrawCallback
	 *  @returns void
	 *  @private
	 */
	"_fnDrawCallback": function ()
	{
		var columns = this.s.dt.aoColumns;
		var buttons = this.dom.buttons;
		var groups = this.s.aoGroups;
		
		for ( var i=0, iLen=columns.length ; i<iLen ; i++ )
		{
			if ( buttons[i] !== null )
			{
				$('input', buttons[i]).prop( 'checked', columns[i].bVisible );
			}
		}

		var allVisible = function ( columnIndeces ) {
			for ( var k=0, kLen=columnIndeces.length ; k<kLen ; k++ )
			{
				if (  columns[columnIndeces[k]].bVisible === false ) { return false; }
			}
			return true;
		};
		var allHidden = function ( columnIndeces ) {
			for ( var m=0 , mLen=columnIndeces.length ; m<mLen ; m++ )
			{
				if ( columns[columnIndeces[m]].bVisible === true ) { return false; }
			}
			return true;
		};

		for ( var j=0, jLen=groups.length ; j<jLen ; j++ )
		{
			if ( allVisible(groups[j].aiColumns) )
			{
				$('input', this.dom.groupButtons[j]).prop('checked', true);
				$('input', this.dom.groupButtons[j]).prop('indeterminate', false);
			}
			else if ( allHidden(groups[j].aiColumns) )
			{
				$('input', this.dom.groupButtons[j]).prop('checked', false);
				$('input', this.dom.groupButtons[j]).prop('indeterminate', false);
			}
			else
			{
				$('input', this.dom.groupButtons[j]).prop('indeterminate', true);
			}
		}
	},


	/**
	 * Loop through the groups (provided in the settings) and create a button for each.
	 *  @method  _fnAddgroups
	 *  @returns void
	 *  @private
	 */
	"_fnAddGroups": function ()
	{
		var nButton;

		if ( typeof this.s.aoGroups != 'undefined' )
		{
			for ( var i=0, iLen=this.s.aoGroups.length ; i<iLen ; i++ )
			{
				nButton = this._fnDomGroupButton( i );
				this.dom.groupButtons.push( nButton );
				this.dom.collection.appendChild( nButton );
			}
		}
	},
	
	
	/**
	 * Loop through the columns in the table and as a new button for each one.
	 *  @method  _fnAddButtons
	 *  @returns void
	 *  @private
	 */
	"_fnAddButtons": function ()
	{
		var
			nButton,
			sExclude = ","+this.s.aiExclude.join(',')+",";
		
		if ( $.inArray( 'all', this.s.aiExclude ) === -1 ) {
			for ( var i=0, iLen=this.s.dt.aoColumns.length ; i<iLen ; i++ )
			{
				if ( sExclude.indexOf( ","+i+"," ) == -1 )
				{
					nButton = this._fnDomColumnButton( i );
					this.dom.buttons.push( nButton );
					this.dom.collection.appendChild( nButton );
				}
				else
				{
					this.dom.buttons.push( null );
				}
			}
		}
		
		if ( this.s.bRestore )
		{
			nButton = this._fnDomRestoreButton();
			nButton.className += " ColVis_Restore";
			this.dom.buttons.push( nButton );
			this.dom.collection.appendChild( nButton );
		}
		
		if ( this.s.bShowAll )
		{
			nButton = this._fnDomShowAllButton();
			nButton.className += " ColVis_ShowAll";
			this.dom.buttons.push( nButton );
			this.dom.collection.appendChild( nButton );
		}
	},
	
	
	/**
	 * Create a button which allows a "restore" action
	 *  @method  _fnDomRestoreButton
	 *  @returns {Node} Created button
	 *  @private
	 */
	"_fnDomRestoreButton": function ()
	{
		var
			that = this,
			nButton = document.createElement('button'),
			nSpan = document.createElement('span');
		
		nButton.className = !this.s.dt.bJUI ? "ColVis_Button TableTools_Button" :
			"ColVis_Button TableTools_Button ui-button ui-state-default";
		nButton.appendChild( nSpan );
		$(nSpan).html( '<span class="ColVis_title">'+this.s.sRestore+'</span>' );
		
		$(nButton).click( function (e) {
			for ( var i=0, iLen=that.s.abOriginal.length ; i<iLen ; i++ )
			{
				that.s.dt.oInstance.fnSetColumnVis( i, that.s.abOriginal[i], false );
			}
			that._fnAdjustOpenRows();
			that.s.dt.oInstance.fnAdjustColumnSizing( false );
			that.s.dt.oInstance.fnDraw( false );
		} );
		
		return nButton;
	},
	
	
	/**
	 * Create a button which allows a "show all" action
	 *  @method  _fnDomShowAllButton
	 *  @returns {Node} Created button
	 *  @private
	 */
	"_fnDomShowAllButton": function ()
	{
		var
			that = this,
			nButton = document.createElement('button'),
			nSpan = document.createElement('span');
		
		nButton.className = !this.s.dt.bJUI ? "ColVis_Button TableTools_Button" :
			"ColVis_Button TableTools_Button ui-button ui-state-default";
		nButton.appendChild( nSpan );
		$(nSpan).html( '<span class="ColVis_title">'+this.s.sShowAll+'</span>' );
		
		$(nButton).click( function (e) {
			for ( var i=0, iLen=that.s.abOriginal.length ; i<iLen ; i++ )
			{
				if (that.s.aiExclude.indexOf(i) === -1)
				{
					that.s.dt.oInstance.fnSetColumnVis( i, true, false );
				}
			}
			that._fnAdjustOpenRows();
			that.s.dt.oInstance.fnAdjustColumnSizing( false );
			that.s.dt.oInstance.fnDraw( false );
		} );
		
		return nButton;
	},
	
	
	/**
	 * Create the DOM for a show / hide group button
	 *  @method  _fnDomGroupButton
	 *  @param {int} i Group in question, order based on that provided in settings
	 *  @returns {Node} Created button
	 *  @private
	 */
	"_fnDomGroupButton": function ( i )
	{
		var
			that = this,
			oGroup = this.s.aoGroups[i],
			aoColumns = this.s.dt.aoColumns,
			nButton = document.createElement('button'),
			nSpan = document.createElement('span'),
			dt = this.s.dt;

		nButton.className = !dt.bJUI ? "ColVis_Group ColVis_Button TableTools_Button" :
			"ColVis_Group ColVis_Button TableTools_Button ui-button ui-state-default";
		nButton.appendChild( nSpan );
		var sTitle = oGroup.sTitle;
		$(nSpan).html(
			'<span class="ColVis_radio"><input type="checkbox"/></span>'+
			'<span class="ColVis_title">'+sTitle+'</span>' );

		$(nButton).click( function (e) {
			var showHide = !$('input', this).is(":checked");
			if ( e.target.nodeName.toLowerCase() == "input" )
			{
				showHide = $('input', this).is(":checked");
			}

			for ( var j=0 ; j < oGroup.aiColumns.length ; j++ )
			{
				that.s.dt.oInstance.fnSetColumnVis( oGroup.aiColumns[j], showHide );
			}
		});

		return nButton;
	},


	/**
	 * Create the DOM for a show / hide button
	 *  @method  _fnDomColumnButton
	 *  @param {int} i Column in question
	 *  @returns {Node} Created button
	 *  @private
	 */
	"_fnDomColumnButton": function ( i )
	{
		var
			that = this,
			oColumn = this.s.dt.aoColumns[i],
			nButton = document.createElement('button'),
			nSpan = document.createElement('span'),
			dt = this.s.dt;
		
		nButton.className = !dt.bJUI ? "ColVis_Button TableTools_Button" :
			"ColVis_Button TableTools_Button ui-button ui-state-default";
		nButton.appendChild( nSpan );
		var sTitle = this.s.fnLabel===null ? oColumn.sTitle : this.s.fnLabel( i, oColumn.sTitle, oColumn.nTh );
		$(nSpan).html(
			'<span class="ColVis_radio"><input type="checkbox" checked=""/></span>'+
			'<span class="ColVis_title">'+sTitle+'</span>' );
		
		$(nButton).click( function (e) {
			var showHide = !$('input', this).is(":checked");
			if ( e.target.nodeName.toLowerCase() == "input" )
			{
				showHide = $('input', this).is(":checked");
			}
			
			/* Need to consider the case where the initialiser created more than one table - change the
			 * API index that DataTables is using
			 */
			var oldIndex = $.fn.dataTableExt.iApiIndex;
			$.fn.dataTableExt.iApiIndex = that._fnDataTablesApiIndex.call(that);

			// Optimisation for server-side processing when scrolling - don't do a full redraw
			if ( dt.oFeatures.bServerSide && (dt.oScroll.sX !== "" || dt.oScroll.sY !== "" ) )
			{
				that.s.dt.oInstance.fnSetColumnVis( i, showHide, false );
				that.s.dt.oInstance.fnAdjustColumnSizing( false );
				that.s.dt.oInstance.oApi._fnScrollDraw( that.s.dt );
				that._fnDrawCallback();
			}
			else
			{
				that.s.dt.oInstance.fnSetColumnVis( i, showHide );
			}

			$.fn.dataTableExt.iApiIndex = oldIndex; /* Restore */
			
			if ( that.s.fnStateChange !== null )
			{
				that.s.fnStateChange.call( that, i, showHide );
			}
		} );
		
		return nButton;
	},
	
	
	/**
	 * Get the position in the DataTables instance array of the table for this instance of ColVis
	 *  @method  _fnDataTablesApiIndex
	 *  @returns {int} Index
	 *  @private
	 */
	"_fnDataTablesApiIndex": function ()
	{
		for ( var i=0, iLen=this.s.dt.oInstance.length ; i<iLen ; i++ )
		{
			if ( this.s.dt.oInstance[i] == this.s.dt.nTable )
			{
				return i;
			}
		}
		return 0;
	},
	
	
	/**
	 * Create the DOM needed for the button and apply some base properties. All buttons start here
	 *  @method  _fnDomBaseButton
	 *  @param   {String} text Button text
	 *  @returns {Node} DIV element for the button
	 *  @private
	 */
	"_fnDomBaseButton": function ( text )
	{
		var
			that = this,
			nButton = document.createElement('button'),
			nSpan = document.createElement('span'),
			sEvent = this.s.activate=="mouseover" ? "mouseover" : "click";
		
		nButton.className = !this.s.dt.bJUI ? "ColVis_Button TableTools_Button" :
			"ColVis_Button TableTools_Button ui-button ui-state-default";
		nButton.appendChild( nSpan );
		nSpan.innerHTML = text;
		
		$(nButton).bind( sEvent, function (e) {
			that._fnCollectionShow();
			e.preventDefault();
		} );
		
		return nButton;
	},
	
	
	/**
	 * Create the element used to contain list the columns (it is shown and hidden as needed)
	 *  @method  _fnDomCollection
	 *  @returns {Node} div container for the collection
	 *  @private
	 */
	"_fnDomCollection": function ()
	{
		var that = this;
		var nHidden = document.createElement('div');
		nHidden.style.display = "none";
		nHidden.className = !this.s.dt.bJUI ? "ColVis_collection TableTools_collection" :
			"ColVis_collection TableTools_collection ui-buttonset ui-buttonset-multi";
		
		if ( !this.s.bCssPosition )
		{
			nHidden.style.position = "absolute";
		}
		$(nHidden).css('opacity', 0);
		
		return nHidden;
	},
	
	
	/**
	 * An element to be placed on top of the activate button to catch events
	 *  @method  _fnDomCatcher
	 *  @returns {Node} div container for the collection
	 *  @private
	 */
	"_fnDomCatcher": function ()
	{
		var
			that = this,
			nCatcher = document.createElement('div');
		nCatcher.className = "ColVis_catcher TableTools_catcher";
		
		$(nCatcher).click( function () {
			that._fnCollectionHide.call( that, null, null );
		} );
		
		return nCatcher;
	},
	
	
	/**
	 * Create the element used to shade the background, and capture hide events (it is shown and
	 * hidden as needed)
	 *  @method  _fnDomBackground
	 *  @returns {Node} div container for the background
	 *  @private
	 */
	"_fnDomBackground": function ()
	{
		var that = this;
		
		var background = $('<div></div>')
			.addClass( 'ColVis_collectionBackground TableTools_collectionBackground' )
			.css( 'opacity', 0 )
			.click( function () {
				that._fnCollectionHide.call( that, null, null );
			} );
		
		/* When considering a mouse over action for the activation, we also consider a mouse out
		 * which is the same as a mouse over the background - without all the messing around of
		 * bubbling events. Use the catcher element to avoid messing around with bubbling
		 */
		if ( this.s.activate == "mouseover" )
		{
			background.mouseover( function () {
				that.s.overcollection = false;
				that._fnCollectionHide.call( that, null, null );
			} );
		}
		
		return background[0];
	},
	
	
	/**
	 * Show the show / hide list and the background
	 *  @method  _fnCollectionShow
	 *  @returns void
	 *  @private
	 */
	"_fnCollectionShow": function ()
	{
		var that = this, i, iLen, iLeft;
		var oPos = $(this.dom.button).offset();
		var nHidden = this.dom.collection;
		var nBackground = this.dom.background;
		var iDivX = parseInt(oPos.left, 10);
		var iDivY = parseInt(oPos.top + $(this.dom.button).outerHeight(), 10);
		
		if ( !this.s.bCssPosition )
		{
			nHidden.style.top = iDivY+"px";
			nHidden.style.left = iDivX+"px";
		}
		
		$(nHidden).css( {
			'display': 'block',
			'opacity': 0
		} );
		
		nBackground.style.bottom ='0px';
		nBackground.style.right = '0px';
		
		var oStyle = this.dom.catcher.style;
		oStyle.height = $(this.dom.button).outerHeight()+"px";
		oStyle.width = $(this.dom.button).outerWidth()+"px";
		oStyle.top = oPos.top+"px";
		oStyle.left = iDivX+"px";
		
		document.body.appendChild( nBackground );
		document.body.appendChild( nHidden );
		document.body.appendChild( this.dom.catcher );
		
		/* Resize the buttons */
		if ( this.s.sSize == "auto" )
		{
			var aiSizes = [];
			this.dom.collection.style.width = "auto";
			for ( i=0, iLen=this.dom.buttons.length ; i<iLen ; i++ )
			{
				if ( this.dom.buttons[i] !== null )
				{
					this.dom.buttons[i].style.width = "auto";
					aiSizes.push( $(this.dom.buttons[i]).outerWidth() );
				}
			}
			var iMax = Math.max.apply(window, aiSizes);
			for ( i=0, iLen=this.dom.buttons.length ; i<iLen ; i++ )
			{
				if ( this.dom.buttons[i] !== null )
				{
					this.dom.buttons[i].style.width = iMax+"px";
				}
			}
			this.dom.collection.style.width = iMax+"px";
		}
		
		/* This results in a very small delay for the end user but it allows the animation to be
		 * much smoother. If you don't want the animation, then the setTimeout can be removed
		 */
		$(nHidden).animate({"opacity": 1}, that.s.iOverlayFade);
		$(nBackground).animate({"opacity": 0.1}, that.s.iOverlayFade, 'linear', function () {
			/* In IE6 if you set the checked attribute of a hidden checkbox, then this is not visually
			 * reflected. As such, we need to do it here, once it is visible. Unbelievable.
			 */
			if ( $.browser && $.browser.msie && $.browser.version == "6.0" )
			{
				that._fnDrawCallback();
			}
		});
		
		/* Visual corrections to try and keep the collection visible */
		if ( !this.s.bCssPosition )
		{
			iLeft = ( this.s.sAlign=="left" ) ?
				iDivX :
				iDivX - $(nHidden).outerWidth() + $(this.dom.button).outerWidth();

			nHidden.style.left = iLeft+"px";

			var iDivWidth = $(nHidden).outerWidth();
			var iDivHeight = $(nHidden).outerHeight();
			var iDocWidth = $(document).width();
			
			if ( iLeft + iDivWidth > iDocWidth )
			{
				nHidden.style.left = (iDocWidth-iDivWidth)+"px";
			}
		}
		
		this.s.hidden = false;
	},
	
	
	/**
	 * Hide the show / hide list and the background
	 *  @method  _fnCollectionHide
	 *  @returns void
	 *  @private
	 */
	"_fnCollectionHide": function (  )
	{
		var that = this;
		
		if ( !this.s.hidden && this.dom.collection !== null )
		{
			this.s.hidden = true;
			
			$(this.dom.collection).animate({"opacity": 0}, that.s.iOverlayFade, function (e) {
				this.style.display = "none";
			} );
			
			$(this.dom.background).animate({"opacity": 0}, that.s.iOverlayFade, function (e) {
				document.body.removeChild( that.dom.background );
				document.body.removeChild( that.dom.catcher );
			} );
		}
	},
	
	
	/**
	 * Alter the colspan on any fnOpen rows
	 */
	"_fnAdjustOpenRows": function ()
	{
		var aoOpen = this.s.dt.aoOpenRows;
		var iVisible = this.s.dt.oApi._fnVisbleColumns( this.s.dt );
		
		for ( var i=0, iLen=aoOpen.length ; i<iLen ; i++ ) {
			aoOpen[i].nTr.getElementsByTagName('td')[0].colSpan = iVisible;
		}
	}
};





/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Static object methods
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**
 * Rebuild the collection for a given table, or all tables if no parameter given
 *  @method  ColVis.fnRebuild
 *  @static
 *  @param   object oTable DataTable instance to consider - optional
 *  @returns void
 */
ColVis.fnRebuild = function ( oTable )
{
	var nTable = null;
	if ( typeof oTable != 'undefined' )
	{
		nTable = oTable.fnSettings().nTable;
	}
	
	for ( var i=0, iLen=ColVis.aInstances.length ; i<iLen ; i++ )
	{
		if ( typeof oTable == 'undefined' || nTable == ColVis.aInstances[i].s.dt.nTable )
		{
			ColVis.aInstances[i].fnRebuild();
		}
	}
};





/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Static object properties
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**
 * Collection of all ColVis instances
 *  @property ColVis.aInstances
 *  @static
 *  @type     Array
 *  @default  []
 */
ColVis.aInstances = [];





/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Constants
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**
 * Name of this class
 *  @constant CLASS
 *  @type     String
 *  @default  ColVis
 */
ColVis.prototype.CLASS = "ColVis";


/**
 * ColVis version
 *  @constant  VERSION
 *  @type      String
 *  @default   See code
 */
ColVis.VERSION = "1.1.0-dev";
ColVis.prototype.VERSION = ColVis.VERSION;





/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Initialisation
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Register a new feature with DataTables
 */
if ( typeof $.fn.dataTable == "function" &&
     typeof $.fn.dataTableExt.fnVersionCheck == "function" &&
     $.fn.dataTableExt.fnVersionCheck('1.7.0') )
{
	$.fn.dataTableExt.aoFeatures.push( {
		"fnInit": function( oDTSettings ) {
			var init = (typeof oDTSettings.oInit.oColVis == 'undefined') ?
				{} : oDTSettings.oInit.oColVis;
			var oColvis = new ColVis( oDTSettings, init );
			return oColvis.dom.wrapper;
		},
		"cFeature": "C",
		"sFeature": "ColVis"
	} );
}
else
{
	alert( "Warning: ColVis requires DataTables 1.7 or greater - www.datatables.net/download");
}


// Make ColVis accessible from the DataTables instance
$.fn.dataTable.ColVis = ColVis;


})(jQuery);