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/*!

 * jQuery UI Sortable 1.10.2

 * http://jqueryui.com

 *

 * Copyright 2013 jQuery Foundation and other contributors

 * Released under the MIT license.

 * http://jquery.org/license

 *

 * http://api.jqueryui.com/sortable/

 *

 * Depends:

 *        jquery.ui.core.js

 *        jquery.ui.mouse.js

 *        jquery.ui.widget.js

 */

(function( $, undefined ) {

/*jshint loopfunc: true */

function isOverAxis( x, reference, size ) {

        return ( x > reference ) && ( x < ( reference + size ) );

}

function isFloating(item) {

        return (/left|right/).test(item.css("float")) || (/inline|table-cell/).test(item.css("display"));

}

$.widget("ui.sortable", $.ui.mouse, {

        version: "1.10.2",

        widgetEventPrefix: "sort",

        ready: false,

        options: {

                appendTo: "parent",

                axis: false,

                connectWith: false,

                containment: false,

                cursor: "auto",

                cursorAt: false,

                dropOnEmpty: true,

                forcePlaceholderSize: false,

                forceHelperSize: false,

                grid: false,

                handle: false,

                helper: "original",

                items: "> *",

                opacity: false,

                placeholder: false,

                revert: false,

                scroll: true,

                scrollSensitivity: 20,

                scrollSpeed: 20,

                scope: "default",

                tolerance: "intersect",

                zIndex: 1000,

                // callbacks

                activate: null,

                beforeStop: null,

                change: null,

                deactivate: null,

                out: null,

                over: null,

                receive: null,

                remove: null,

                sort: null,

                start: null,

                stop: null,

                update: null

        },

        _create: function() {

                var o = this.options;

                this.containerCache = {};

                this.element.addClass("ui-sortable");

                //Get the items

                this.refresh();

                //Let's determine if the items are being displayed horizontally

                this.floating = this.items.length ? o.axis === "x" || isFloating(this.items[0].item) : false;

                //Let's determine the parent's offset

                this.offset = this.element.offset();

                //Initialize mouse events for interaction

                this._mouseInit();

                //We're ready to go

                this.ready = true;

        },

        _destroy: function() {

                this.element

                        .removeClass("ui-sortable ui-sortable-disabled");

                this._mouseDestroy();

                for ( var i = this.items.length - 1; i >= 0; i-- ) {

                        this.items[i].item.removeData(this.widgetName + "-item");

                }

                return this;

        },

        _setOption: function(key, value){

                if ( key === "disabled" ) {

                        this.options[ key ] = value;

                        this.widget().toggleClass( "ui-sortable-disabled", !!value );

                } else {

                        // Don't call widget base _setOption for disable as it adds ui-state-disabled class

                        $.Widget.prototype._setOption.apply(this, arguments);

                }

        },

        _mouseCapture: function(event, overrideHandle) {

                var currentItem = null,

                        validHandle = false,

                        that = this;

                if (this.reverting) {

                        return false;

                }

                if(this.options.disabled || this.options.type === "static") {

                        return false;

                }

                //We have to refresh the items data once first

                this._refreshItems(event);

                //Find out if the clicked node (or one of its parents) is a actual item in this.items

                $(event.target).parents().each(function() {

                        if($.data(this, that.widgetName + "-item") === that) {

                                currentItem = $(this);

                                return false;

                        }

                });

                if($.data(event.target, that.widgetName + "-item") === that) {

                        currentItem = $(event.target);

                }

                if(!currentItem) {

                        return false;

                }

                if(this.options.handle && !overrideHandle) {

                        $(this.options.handle, currentItem).find("*").addBack().each(function() {

                                if(this === event.target) {

                                        validHandle = true;

                                }

                        });

                        if(!validHandle) {

                                return false;

                        }

                }

                this.currentItem = currentItem;

                this._removeCurrentsFromItems();

                return true;

        },

        _mouseStart: function(event, overrideHandle, noActivation) {

                var i, body,

                        o = this.options;

                this.currentContainer = this;

                //We only need to call refreshPositions, because the refreshItems call has been moved to mouseCapture

                this.refreshPositions();

                //Create and append the visible helper

                this.helper = this._createHelper(event);

                //Cache the helper size

                this._cacheHelperProportions();

                /*

                 * - Position generation -

                 * This block generates everything position related - it's the core of draggables.

                 */

                //Cache the margins of the original element

                this._cacheMargins();

                //Get the next scrolling parent

                this.scrollParent = this.helper.scrollParent();

                //The element's absolute position on the page minus margins

                this.offset = this.currentItem.offset();

                this.offset = {

                        top: this.offset.top - this.margins.top,

                        left: this.offset.left - this.margins.left

                };

                $.extend(this.offset, {

                        click: { //Where the click happened, relative to the element

                                left: event.pageX - this.offset.left,

                                top: event.pageY - this.offset.top

                        },

                        parent: this._getParentOffset(),

                        relative: this._getRelativeOffset() //This is a relative to absolute position minus the actual position calculation - only used for relative positioned helper

                });

                // Only after we got the offset, we can change the helper's position to absolute

                // TODO: Still need to figure out a way to make relative sorting possible

                this.helper.css("position", "absolute");

                this.cssPosition = this.helper.css("position");

                //Generate the original position

                this.originalPosition = this._generatePosition(event);

                this.originalPageX = event.pageX;

                this.originalPageY = event.pageY;

                //Adjust the mouse offset relative to the helper if "cursorAt" is supplied

                (o.cursorAt && this._adjustOffsetFromHelper(o.cursorAt));

                //Cache the former DOM position

                this.domPosition = { prev: this.currentItem.prev()[0], parent: this.currentItem.parent()[0] };

                //If the helper is not the original, hide the original so it's not playing any role during the drag, won't cause anything bad this way

                if(this.helper[0] !== this.currentItem[0]) {

                        this.currentItem.hide();

                }

                //Create the placeholder

                this._createPlaceholder();

                //Set a containment if given in the options

                if(o.containment) {

                        this._setContainment();

                }

                if( o.cursor && o.cursor !== "auto" ) { // cursor option

                        body = this.document.find( "body" );

                        // support: IE

                        this.storedCursor = body.css( "cursor" );

                        body.css( "cursor", o.cursor );

                        this.storedStylesheet = $( "<style>*{ cursor: "+o.cursor+" !important; }</style>" ).appendTo( body );

                }

                if(o.opacity) { // opacity option

                        if (this.helper.css("opacity")) {

                                this._storedOpacity = this.helper.css("opacity");

                        }

                        this.helper.css("opacity", o.opacity);

                }

                if(o.zIndex) { // zIndex option

                        if (this.helper.css("zIndex")) {

                                this._storedZIndex = this.helper.css("zIndex");

                        }

                        this.helper.css("zIndex", o.zIndex);

                }

                //Prepare scrolling

                if(this.scrollParent[0] !== document && this.scrollParent[0].tagName !== "HTML") {

                        this.overflowOffset = this.scrollParent.offset();

                }

                //Call callbacks

                this._trigger("start", event, this._uiHash());

                //Recache the helper size

                if(!this._preserveHelperProportions) {

                        this._cacheHelperProportions();

                }

                //Post "activate" events to possible containers

                if( !noActivation ) {

                        for ( i = this.containers.length - 1; i >= 0; i-- ) {

                                this.containers[ i ]._trigger( "activate", event, this._uiHash( this ) );

                        }

                }

                //Prepare possible droppables

                if($.ui.ddmanager) {

                        $.ui.ddmanager.current = this;

                }

                if ($.ui.ddmanager && !o.dropBehaviour) {

                        $.ui.ddmanager.prepareOffsets(this, event);

                }

                this.dragging = true;

                this.helper.addClass("ui-sortable-helper");

                this._mouseDrag(event); //Execute the drag once - this causes the helper not to be visible before getting its correct position

                return true;

        },

        _mouseDrag: function(event) {

                var i, item, itemElement, intersection,

                        o = this.options,

                        scrolled = false;

                //Compute the helpers position

                this.position = this._generatePosition(event);

                this.positionAbs = this._convertPositionTo("absolute");

                if (!this.lastPositionAbs) {

                        this.lastPositionAbs = this.positionAbs;

                }

                //Do scrolling

                if(this.options.scroll) {

                        if(this.scrollParent[0] !== document && this.scrollParent[0].tagName !== "HTML") {

                                if((this.overflowOffset.top + this.scrollParent[0].offsetHeight) - event.pageY < o.scrollSensitivity) {

                                        this.scrollParent[0].scrollTop = scrolled = this.scrollParent[0].scrollTop + o.scrollSpeed;

                                } else if(event.pageY - this.overflowOffset.top < o.scrollSensitivity) {

                                        this.scrollParent[0].scrollTop = scrolled = this.scrollParent[0].scrollTop - o.scrollSpeed;

                                }

                                if((this.overflowOffset.left + this.scrollParent[0].offsetWidth) - event.pageX < o.scrollSensitivity) {

                                        this.scrollParent[0].scrollLeft = scrolled = this.scrollParent[0].scrollLeft + o.scrollSpeed;

                                } else if(event.pageX - this.overflowOffset.left < o.scrollSensitivity) {

                                        this.scrollParent[0].scrollLeft = scrolled = this.scrollParent[0].scrollLeft - o.scrollSpeed;

                                }

                        } else {

                                if(event.pageY - $(document).scrollTop() < o.scrollSensitivity) {

                                        scrolled = $(document).scrollTop($(document).scrollTop() - o.scrollSpeed);

                                } else if($(window).height() - (event.pageY - $(document).scrollTop()) < o.scrollSensitivity) {

                                        scrolled = $(document).scrollTop($(document).scrollTop() + o.scrollSpeed);

                                }

                                if(event.pageX - $(document).scrollLeft() < o.scrollSensitivity) {

                                        scrolled = $(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);

                                } else if($(window).width() - (event.pageX - $(document).scrollLeft()) < o.scrollSensitivity) {

                                        scrolled = $(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);

                                }

                        }

                        if(scrolled !== false && $.ui.ddmanager && !o.dropBehaviour) {

                                $.ui.ddmanager.prepareOffsets(this, event);

                        }

                }

                //Regenerate the absolute position used for position checks

                this.positionAbs = this._convertPositionTo("absolute");

                //Set the helper position

                if(!this.options.axis || this.options.axis !== "y") {

                        this.helper[0].style.left = this.position.left+"px";

                }

                if(!this.options.axis || this.options.axis !== "x") {

                        this.helper[0].style.top = this.position.top+"px";

                }

                //Rearrange

                for (i = this.items.length - 1; i >= 0; i--) {

                        //Cache variables and intersection, continue if no intersection

                        item = this.items[i];

                        itemElement = item.item[0];

                        intersection = this._intersectsWithPointer(item);

                        if (!intersection) {

                                continue;

                        }

                        // Only put the placeholder inside the current Container, skip all

                        // items form other containers. This works because when moving

                        // an item from one container to another the

                        // currentContainer is switched before the placeholder is moved.

                        //

                        // Without this moving items in "sub-sortables" can cause the placeholder to jitter

                        // beetween the outer and inner container.

                        if (item.instance !== this.currentContainer) {

                                continue;

                        }

                        // cannot intersect with itself

                        // no useless actions that have been done before

                        // no action if the item moved is the parent of the item checked

                        if (itemElement !== this.currentItem[0] &&

                                this.placeholder[intersection === 1 ? "next" : "prev"]()[0] !== itemElement &&

                                !$.contains(this.placeholder[0], itemElement) &&

                                (this.options.type === "semi-dynamic" ? !$.contains(this.element[0], itemElement) : true)

                        ) {

                                this.direction = intersection === 1 ? "down" : "up";

                                if (this.options.tolerance === "pointer" || this._intersectsWithSides(item)) {

                                        this._rearrange(event, item);

                                } else {

                                        break;

                                }

                                this._trigger("change", event, this._uiHash());

                                break;

                        }

                }

                //Post events to containers

                this._contactContainers(event);

                //Interconnect with droppables

                if($.ui.ddmanager) {

                        $.ui.ddmanager.drag(this, event);

                }

                //Call callbacks

                this._trigger("sort", event, this._uiHash());

                this.lastPositionAbs = this.positionAbs;

                return false;

        },

        _mouseStop: function(event, noPropagation) {

                if(!event) {

                        return;

                }

                //If we are using droppables, inform the manager about the drop

                if ($.ui.ddmanager && !this.options.dropBehaviour) {

                        $.ui.ddmanager.drop(this, event);

                }

                if(this.options.revert) {

                        var that = this,

                                cur = this.placeholder.offset(),

                                axis = this.options.axis,

                                animation = {};

                        if ( !axis || axis === "x" ) {

                                animation.left = cur.left - this.offset.parent.left - this.margins.left + (this.offsetParent[0] === document.body ? 0 : this.offsetParent[0].scrollLeft);

                        }

                        if ( !axis || axis === "y" ) {

                                animation.top = cur.top - this.offset.parent.top - this.margins.top + (this.offsetParent[0] === document.body ? 0 : this.offsetParent[0].scrollTop);

                        }

                        this.reverting = true;

                        $(this.helper).animate( animation, parseInt(this.options.revert, 10) || 500, function() {

                                that._clear(event);

                        });

                } else {

                        this._clear(event, noPropagation);

                }

                return false;

        },

        cancel: function() {

                if(this.dragging) {

                        this._mouseUp({ target: null });

                        if(this.options.helper === "original") {

                                this.currentItem.css(this._storedCSS).removeClass("ui-sortable-helper");

                        } else {

                                this.currentItem.show();

                        }

                        //Post deactivating events to containers

                        for (var i = this.containers.length - 1; i >= 0; i--){

                                this.containers[i]._trigger("deactivate", null, this._uiHash(this));

                                if(this.containers[i].containerCache.over) {

                                        this.containers[i]._trigger("out", null, this._uiHash(this));

                                        this.containers[i].containerCache.over = 0;

                                }

                        }

                }

                if (this.placeholder) {

                        //$(this.placeholder[0]).remove(); would have been the jQuery way - unfortunately, it unbinds ALL events from the original node!

                        if(this.placeholder[0].parentNode) {

                                this.placeholder[0].parentNode.removeChild(this.placeholder[0]);

                        }

                        if(this.options.helper !== "original" && this.helper && this.helper[0].parentNode) {

                                this.helper.remove();

                        }

                        $.extend(this, {

                                helper: null,

                                dragging: false,

                                reverting: false,

                                _noFinalSort: null

                        });

                        if(this.domPosition.prev) {

                                $(this.domPosition.prev).after(this.currentItem);

                        } else {

                                $(this.domPosition.parent).prepend(this.currentItem);

                        }

                }

                return this;

        },

        serialize: function(o) {

                var items = this._getItemsAsjQuery(o && o.connected),

                        str = [];

                o = o || {};

                $(items).each(function() {

                        var res = ($(o.item || this).attr(o.attribute || "id") || "").match(o.expression || (/(.+)[\-=_](.+)/));

                        if (res) {

                                str.push((o.key || res[1]+"[]")+"="+(o.key && o.expression ? res[1] : res[2]));

                        }

                });

                if(!str.length && o.key) {

                        str.push(o.key + "=");

                }

                return str.join("&");

        },

        toArray: function(o) {

                var items = this._getItemsAsjQuery(o && o.connected),

                        ret = [];

                o = o || {};

                items.each(function() { ret.push($(o.item || this).attr(o.attribute || "id") || ""); });

                return ret;

        },

        /* Be careful with the following core functions */

        _intersectsWith: function(item) {

                var x1 = this.positionAbs.left,

                        x2 = x1 + this.helperProportions.width,

                        y1 = this.positionAbs.top,

                        y2 = y1 + this.helperProportions.height,

                        l = item.left,

                        r = l + item.width,

                        t = item.top,

                        b = t + item.height,

                        dyClick = this.offset.click.top,

                        dxClick = this.offset.click.left,

                        isOverElement = (y1 + dyClick) > t && (y1 + dyClick) < b && (x1 + dxClick) > l && (x1 + dxClick) < r;

                if ( this.options.tolerance === "pointer" ||

                        this.options.forcePointerForContainers ||

                        (this.options.tolerance !== "pointer" && this.helperProportions[this.floating ? "width" : "height"] > item[this.floating ? "width" : "height"])

                ) {

                        return isOverElement;

                } else {

                        return (l < x1 + (this.helperProportions.width / 2) && // Right Half

                                x2 - (this.helperProportions.width / 2) < r && // Left Half

                                t < y1 + (this.helperProportions.height / 2) && // Bottom Half

                                y2 - (this.helperProportions.height / 2) < b ); // Top Half

                }

        },

        _intersectsWithPointer: function(item) {

                var isOverElementHeight = (this.options.axis === "x") || isOverAxis(this.positionAbs.top + this.offset.click.top, item.top, item.height),

                        isOverElementWidth = (this.options.axis === "y") || isOverAxis(this.positionAbs.left + this.offset.click.left, item.left, item.width),

                        isOverElement = isOverElementHeight && isOverElementWidth,

                        verticalDirection = this._getDragVerticalDirection(),

                        horizontalDirection = this._getDragHorizontalDirection();

                if (!isOverElement) {

                        return false;

                }

                return this.floating ?

                        ( ((horizontalDirection && horizontalDirection === "right") || verticalDirection === "down") ? 2 : 1 )

                        : ( verticalDirection && (verticalDirection === "down" ? 2 : 1) );

        },

        _intersectsWithSides: function(item) {

                var isOverBottomHalf = isOverAxis(this.positionAbs.top + this.offset.click.top, item.top + (item.height/2), item.height),

                        isOverRightHalf = isOverAxis(this.positionAbs.left + this.offset.click.left, item.left + (item.width/2), item.width),

                        verticalDirection = this._getDragVerticalDirection(),

                        horizontalDirection = this._getDragHorizontalDirection();

                if (this.floating && horizontalDirection) {

                        return ((horizontalDirection === "right" && isOverRightHalf) || (horizontalDirection === "left" && !isOverRightHalf));

                } else {

                        return verticalDirection && ((verticalDirection === "down" && isOverBottomHalf) || (verticalDirection === "up" && !isOverBottomHalf));

                }

        },

        _getDragVerticalDirection: function() {

                var delta = this.positionAbs.top - this.lastPositionAbs.top;

                return delta !== 0 && (delta > 0 ? "down" : "up");

        },

        _getDragHorizontalDirection: function() {

                var delta = this.positionAbs.left - this.lastPositionAbs.left;

                return delta !== 0 && (delta > 0 ? "right" : "left");

        },

        refresh: function(event) {

                this._refreshItems(event);

                this.refreshPositions();

                return this;

        },

        _connectWith: function() {

                var options = this.options;

                return options.connectWith.constructor === String ? [options.connectWith] : options.connectWith;

        },

        _getItemsAsjQuery: function(connected) {

                var i, j, cur, inst,

                        items = [],

                        queries = [],

                        connectWith = this._connectWith();

                if(connectWith && connected) {

                        for (i = connectWith.length - 1; i >= 0; i--){

                                cur = $(connectWith[i]);

                                for ( j = cur.length - 1; j >= 0; j--){

                                        inst = $.data(cur[j], this.widgetFullName);

                                        if(inst && inst !== this && !inst.options.disabled) {

                                                queries.push([$.isFunction(inst.options.items) ? inst.options.items.call(inst.element) : $(inst.options.items, inst.element).not(".ui-sortable-helper").not(".ui-sortable-placeholder"), inst]);

                                        }

                                }

                        }

                }

                queries.push([$.isFunction(this.options.items) ? this.options.items.call(this.element, null, { options: this.options, item: this.currentItem }) : $(this.options.items, this.element).not(".ui-sortable-helper").not(".ui-sortable-placeholder"), this]);

                for (i = queries.length - 1; i >= 0; i--){

                        queries[i][0].each(function() {

                                items.push(this);

                        });

                }

                return $(items);

        },

        _removeCurrentsFromItems: function() {

                var list = this.currentItem.find(":data(" + this.widgetName + "-item)");

                this.items = $.grep(this.items, function (item) {

                        for (var j=0; j < list.length; j++) {

                                if(list[j] === item.item[0]) {

                                        return false;

                                }

                        }

                        return true;

                });

        },

        _refreshItems: function(event) {

                this.items = [];

                this.containers = [this];

                var i, j, cur, inst, targetData, _queries, item, queriesLength,

                        items = this.items,

                        queries = [[$.isFunction(this.options.items) ? this.options.items.call(this.element[0], event, { item: this.currentItem }) : $(this.options.items, this.element), this]],

                        connectWith = this._connectWith();

                if(connectWith && this.ready) { //Shouldn't be run the first time through due to massive slow-down

                        for (i = connectWith.length - 1; i >= 0; i--){

                                cur = $(connectWith[i]);

                                for (j = cur.length - 1; j >= 0; j--){

                                        inst = $.data(cur[j], this.widgetFullName);

                                        if(inst && inst !== this && !inst.options.disabled) {

                                                queries.push([$.isFunction(inst.options.items) ? inst.options.items.call(inst.element[0], event, { item: this.currentItem }) : $(inst.options.items, inst.element), inst]);

                                                this.containers.push(inst);

                                        }

                                }

                        }

                }

                for (i = queries.length - 1; i >= 0; i--) {

                        targetData = queries[i][1];

                        _queries = queries[i][0];

                        for (j=0, queriesLength = _queries.length; j < queriesLength; j++) {

                                item = $(_queries[j]);

                                item.data(this.widgetName + "-item", targetData); // Data for target checking (mouse manager)

                                items.push({

                                        item: item,

                                        instance: targetData,

                                        width: 0, height: 0,

                                        left: 0, top: 0

                                });

                        }

                }

        },

        refreshPositions: function(fast) {

                //This has to be redone because due to the item being moved out/into the offsetParent, the offsetParent's position will change

                if(this.offsetParent && this.helper) {

                        this.offset.parent = this._getParentOffset();

                }

                var i, item, t, p;

                for (i = this.items.length - 1; i >= 0; i--){

                        item = this.items[i];

                        //We ignore calculating positions of all connected containers when we're not over them

                        if(item.instance !== this.currentContainer && this.currentContainer && item.item[0] !== this.currentItem[0]) {

                                continue;

                        }

                        t = this.options.toleranceElement ? $(this.options.toleranceElement, item.item) : item.item;

                        if (!fast) {

                                item.width = t.outerWidth();

                                item.height = t.outerHeight();

                        }

                        p = t.offset();

                        item.left = p.left;

                        item.top = p.top;

                }

                if(this.options.custom && this.options.custom.refreshContainers) {

                        this.options.custom.refreshContainers.call(this);

                } else {

                        for (i = this.containers.length - 1; i >= 0; i--){

                                p = this.containers[i].element.offset();

                                this.containers[i].containerCache.left = p.left;

                                this.containers[i].containerCache.top = p.top;

                                this.containers[i].containerCache.width        = this.containers[i].element.outerWidth();

                                this.containers[i].containerCache.height = this.containers[i].element.outerHeight();

                        }

                }

                return this;

        },

        _createPlaceholder: function(that) {

                that = that || this;

                var className,

                        o = that.options;

                if(!o.placeholder || o.placeholder.constructor === String) {

                        className = o.placeholder;

                        o.placeholder = {

                                element: function() {

                                        var nodeName = that.currentItem[0].nodeName.toLowerCase(),

                                                element = $( that.document[0].createElement( nodeName ) )

                                                        .addClass(className || that.currentItem[0].className+" ui-sortable-placeholder")

                                                        .removeClass("ui-sortable-helper");

                                        if ( nodeName === "tr" ) {

                                                // Use a high colspan to force the td to expand the full

                                                // width of the table (browsers are smart enough to

                                                // handle this properly)

                                                element.append( "<td colspan='99'>&#160;</td>" );

                                        } else if ( nodeName === "img" ) {

                                                element.attr( "src", that.currentItem.attr( "src" ) );

                                        }

                                        if ( !className ) {

                                                element.css( "visibility", "hidden" );

                                        }

                                        return element;

                                },

                                update: function(container, p) {

                                        // 1. If a className is set as 'placeholder option, we don't force sizes - the class is responsible for that

                                        // 2. The option 'forcePlaceholderSize can be enabled to force it even if a class name is specified

                                        if(className && !o.forcePlaceholderSize) {

                                                return;

                                        }

                                        //If the element doesn't have a actual height by itself (without styles coming from a stylesheet), it receives the inline height from the dragged item

                                        if(!p.height()) { p.height(that.currentItem.innerHeight() - parseInt(that.currentItem.css("paddingTop")||0, 10) - parseInt(that.currentItem.css("paddingBottom")||0, 10)); }

                                        if(!p.width()) { p.width(that.currentItem.innerWidth() - parseInt(that.currentItem.css("paddingLeft")||0, 10) - parseInt(that.currentItem.css("paddingRight")||0, 10)); }

                                }

                        };

                }

                //Create the placeholder

                that.placeholder = $(o.placeholder.element.call(that.element, that.currentItem));

                //Append it after the actual current item

                that.currentItem.after(that.placeholder);

                //Update the size of the placeholder (TODO: Logic to fuzzy, see line 316/317)

                o.placeholder.update(that, that.placeholder);

        },

        _contactContainers: function(event) {

                var i, j, dist, itemWithLeastDistance, posProperty, sizeProperty, base, cur, nearBottom, floating,

                        innermostContainer = null,

                        innermostIndex = null;

                // get innermost container that intersects with item

                for (i = this.containers.length - 1; i >= 0; i--) {

                        // never consider a container that's located within the item itself

                        if($.contains(this.currentItem[0], this.containers[i].element[0])) {

                                continue;

                        }

                        if(this._intersectsWith(this.containers[i].containerCache)) {

                                // if we've already found a container and it's more "inner" than this, then continue

                                if(innermostContainer && $.contains(this.containers[i].element[0], innermostContainer.element[0])) {

                                        continue;

                                }

                                innermostContainer = this.containers[i];

                                innermostIndex = i;

                        } else {

                                // container doesn't intersect. trigger "out" event if necessary

                                if(this.containers[i].containerCache.over) {

                                        this.containers[i]._trigger("out", event, this._uiHash(this));

                                        this.containers[i].containerCache.over = 0;

                                }

                        }

                }

                // if no intersecting containers found, return

                if(!innermostContainer) {

                        return;

                }

                // move the item into the container if it's not there already

                if(this.containers.length === 1) {

                        if (!this.containers[innermostIndex].containerCache.over) {

                                this.containers[innermostIndex]._trigger("over", event, this._uiHash(this));

                                this.containers[innermostIndex].containerCache.over = 1;

                        }

                } else {

                        //When entering a new container, we will find the item with the least distance and append our item near it

                        dist = 10000;

                        itemWithLeastDistance = null;

                        floating = innermostContainer.floating || isFloating(this.currentItem);

                        posProperty = floating ? "left" : "top";

                        sizeProperty = floating ? "width" : "height";

                        base = this.positionAbs[posProperty] + this.offset.click[posProperty];

                        for (j = this.items.length - 1; j >= 0; j--) {

                                if(!$.contains(this.containers[innermostIndex].element[0], this.items[j].item[0])) {

                                        continue;

                                }

                                if(this.items[j].item[0] === this.currentItem[0]) {

                                        continue;

                                }

                                if (floating && !isOverAxis(this.positionAbs.top + this.offset.click.top, this.items[j].top, this.items[j].height)) {

                                        continue;

                                }

                                cur = this.items[j].item.offset()[posProperty];

                                nearBottom = false;

                                if(Math.abs(cur - base) > Math.abs(cur + this.items[j][sizeProperty] - base)){

                                        nearBottom = true;

                                        cur += this.items[j][sizeProperty];

                                }

                                if(Math.abs(cur - base) < dist) {

                                        dist = Math.abs(cur - base); itemWithLeastDistance = this.items[j];

                                        this.direction = nearBottom ? "up": "down";

                                }

                        }

                        //Check if dropOnEmpty is enabled

                        if(!itemWithLeastDistance && !this.options.dropOnEmpty) {

                                return;

                        }

                        if(this.currentContainer === this.containers[innermostIndex]) {

                                return;

                        }

                        itemWithLeastDistance ? this._rearrange(event, itemWithLeastDistance, null, true) : this._rearrange(event, null, this.containers[innermostIndex].element, true);

                        this._trigger("change", event, this._uiHash());

                        this.containers[innermostIndex]._trigger("change", event, this._uiHash(this));

                        this.currentContainer = this.containers[innermostIndex];

                        //Update the placeholder

                        this.options.placeholder.update(this.currentContainer, this.placeholder);

                        this.containers[innermostIndex]._trigger("over", event, this._uiHash(this));

                        this.containers[innermostIndex].containerCache.over = 1;

                }

        },

        _createHelper: function(event) {

                var o = this.options,

                        helper = $.isFunction(o.helper) ? $(o.helper.apply(this.element[0], [event, this.currentItem])) : (o.helper === "clone" ? this.currentItem.clone() : this.currentItem);

                //Add the helper to the DOM if that didn't happen already

                if(!helper.parents("body").length) {

                        $(o.appendTo !== "parent" ? o.appendTo : this.currentItem[0].parentNode)[0].appendChild(helper[0]);

                }

                if(helper[0] === this.currentItem[0]) {

                        this._storedCSS = { width: this.currentItem[0].style.width, height: this.currentItem[0].style.height, position: this.currentItem.css("position"), top: this.currentItem.css("top"), left: this.currentItem.css("left") };

                }

                if(!helper[0].style.width || o.forceHelperSize) {

                        helper.width(this.currentItem.width());

                }

                if(!helper[0].style.height || o.forceHelperSize) {

                        helper.height(this.currentItem.height());

                }

                return helper;

        },

        _adjustOffsetFromHelper: function(obj) {

                if (typeof obj === "string") {

                        obj = obj.split(" ");

                }

                if ($.isArray(obj)) {

                        obj = {left: +obj[0], top: +obj[1] || 0};

                }

                if ("left" in obj) {

                        this.offset.click.left = obj.left + this.margins.left;

                }

                if ("right" in obj) {

                        this.offset.click.left = this.helperProportions.width - obj.right + this.margins.left;

                }

                if ("top" in obj) {

                        this.offset.click.top = obj.top + this.margins.top;

                }

                if ("bottom" in obj) {

                        this.offset.click.top = this.helperProportions.height - obj.bottom + this.margins.top;

                }

        },

        _getParentOffset: function() {

                //Get the offsetParent and cache its position

                this.offsetParent = this.helper.offsetParent();

                var po = this.offsetParent.offset();

                // This is a special case where we need to modify a offset calculated on start, since the following happened:

                // 1. The position of the helper is absolute, so it's position is calculated based on the next positioned parent

                // 2. The actual offset parent is a child of the scroll parent, and the scroll parent isn't the document, which means that

                //    the scroll is included in the initial calculation of the offset of the parent, and never recalculated upon drag

                if(this.cssPosition === "absolute" && this.scrollParent[0] !== document && $.contains(this.scrollParent[0], this.offsetParent[0])) {

                        po.left += this.scrollParent.scrollLeft();

                        po.top += this.scrollParent.scrollTop();

                }

                // This needs to be actually done for all browsers, since pageX/pageY includes this information

                // with an ugly IE fix

                if( this.offsetParent[0] === document.body || (this.offsetParent[0].tagName && this.offsetParent[0].tagName.toLowerCase() === "html" && $.ui.ie)) {

                        po = { top: 0, left: 0 };

                }

                return {

                        top: po.top + (parseInt(this.offsetParent.css("borderTopWidth"),10) || 0),

                        left: po.left + (parseInt(this.offsetParent.css("borderLeftWidth"),10) || 0)

                };

        },

        _getRelativeOffset: function() {

                if(this.cssPosition === "relative") {

                        var p = this.currentItem.position();

                        return {

                                top: p.top - (parseInt(this.helper.css("top"),10) || 0) + this.scrollParent.scrollTop(),

                                left: p.left - (parseInt(this.helper.css("left"),10) || 0) + this.scrollParent.scrollLeft()

                        };

                } else {

                        return { top: 0, left: 0 };

                }

        },

        _cacheMargins: function() {

                this.margins = {

                        left: (parseInt(this.currentItem.css("marginLeft"),10) || 0),

                        top: (parseInt(this.currentItem.css("marginTop"),10) || 0)

                };

        },

        _cacheHelperProportions: function() {

                this.helperProportions = {

                        width: this.helper.outerWidth(),

                        height: this.helper.outerHeight()

                };

        },

        _setContainment: function() {

                var ce, co, over,

                        o = this.options;

                if(o.containment === "parent") {

                        o.containment = this.helper[0].parentNode;

                }

                if(o.containment === "document" || o.containment === "window") {

                        this.containment = [

                                0 - this.offset.relative.left - this.offset.parent.left,

                                0 - this.offset.relative.top - this.offset.parent.top,

                                $(o.containment === "document" ? document : window).width() - this.helperProportions.width - this.margins.left,

                                ($(o.containment === "document" ? document : window).height() || document.body.parentNode.scrollHeight) - this.helperProportions.height - this.margins.top

                        ];

                }

                if(!(/^(document|window|parent)$/).test(o.containment)) {

                        ce = $(o.containment)[0];

                        co = $(o.containment).offset();

                        over = ($(ce).css("overflow") !== "hidden");

                        this.containment = [

                                co.left + (parseInt($(ce).css("borderLeftWidth"),10) || 0) + (parseInt($(ce).css("paddingLeft"),10) || 0) - this.margins.left,

                                co.top + (parseInt($(ce).css("borderTopWidth"),10) || 0) + (parseInt($(ce).css("paddingTop"),10) || 0) - this.margins.top,

                                co.left+(over ? Math.max(ce.scrollWidth,ce.offsetWidth) : ce.offsetWidth) - (parseInt($(ce).css("borderLeftWidth"),10) || 0) - (parseInt($(ce).css("paddingRight"),10) || 0) - this.helperProportions.width - this.margins.left,

                                co.top+(over ? Math.max(ce.scrollHeight,ce.offsetHeight) : ce.offsetHeight) - (parseInt($(ce).css("borderTopWidth"),10) || 0) - (parseInt($(ce).css("paddingBottom"),10) || 0) - this.helperProportions.height - this.margins.top

                        ];

                }

        },

        _convertPositionTo: function(d, pos) {

                if(!pos) {

                        pos = this.position;

                }

                var mod = d === "absolute" ? 1 : -1,

                        scroll = this.cssPosition === "absolute" && !(this.scrollParent[0] !== document && $.contains(this.scrollParent[0], this.offsetParent[0])) ? this.offsetParent : this.scrollParent,

                        scrollIsRootNode = (/(html|body)/i).test(scroll[0].tagName);

                return {

                        top: (

                                pos.top        +                                                                                                                                // The absolute mouse position

                                this.offset.relative.top * mod +                                                                                // Only for relative positioned nodes: Relative offset from element to offset parent

                                this.offset.parent.top * mod -                                                                                        // The offsetParent's offset without borders (offset + border)

                                ( ( this.cssPosition === "fixed" ? -this.scrollParent.scrollTop() : ( scrollIsRootNode ? 0 : scroll.scrollTop() ) ) * mod)

                        ),

                        left: (

                                pos.left +                                                                                                                                // The absolute mouse position

                                this.offset.relative.left * mod +                                                                                // Only for relative positioned nodes: Relative offset from element to offset parent

                                this.offset.parent.left * mod        -                                                                                // The offsetParent's offset without borders (offset + border)

                                ( ( this.cssPosition === "fixed" ? -this.scrollParent.scrollLeft() : scrollIsRootNode ? 0 : scroll.scrollLeft() ) * mod)

                        )

                };

        },

        _generatePosition: function(event) {

                var top, left,

                        o = this.options,

                        pageX = event.pageX,

                        pageY = event.pageY,

                        scroll = this.cssPosition === "absolute" && !(this.scrollParent[0] !== document && $.contains(this.scrollParent[0], this.offsetParent[0])) ? this.offsetParent : this.scrollParent, scrollIsRootNode = (/(html|body)/i).test(scroll[0].tagName);

                // This is another very weird special case that only happens for relative elements:

                // 1. If the css position is relative

                // 2. and the scroll parent is the document or similar to the offset parent

                // we have to refresh the relative offset during the scroll so there are no jumps

                if(this.cssPosition === "relative" && !(this.scrollParent[0] !== document && this.scrollParent[0] !== this.offsetParent[0])) {

                        this.offset.relative = this._getRelativeOffset();

                }

                /*

                 * - Position constraining -

                 * Constrain the position to a mix of grid, containment.

                 */

                if(this.originalPosition) { //If we are not dragging yet, we won't check for options

                        if(this.containment) {

                                if(event.pageX - this.offset.click.left < this.containment[0]) {

                                        pageX = this.containment[0] + this.offset.click.left;

                                }

                                if(event.pageY - this.offset.click.top < this.containment[1]) {

                                        pageY = this.containment[1] + this.offset.click.top;

                                }

                                if(event.pageX - this.offset.click.left > this.containment[2]) {

                                        pageX = this.containment[2] + this.offset.click.left;

                                }

                                if(event.pageY - this.offset.click.top > this.containment[3]) {

                                        pageY = this.containment[3] + this.offset.click.top;

                                }

                        }

                        if(o.grid) {

                                top = this.originalPageY + Math.round((pageY - this.originalPageY) / o.grid[1]) * o.grid[1];

                                pageY = this.containment ? ( (top - this.offset.click.top >= this.containment[1] && top - this.offset.click.top <= this.containment[3]) ? top : ((top - this.offset.click.top >= this.containment[1]) ? top - o.grid[1] : top + o.grid[1])) : top;

                                left = this.originalPageX + Math.round((pageX - this.originalPageX) / o.grid[0]) * o.grid[0];

                                pageX = this.containment ? ( (left - this.offset.click.left >= this.containment[0] && left - this.offset.click.left <= this.containment[2]) ? left : ((left - this.offset.click.left >= this.containment[0]) ? left - o.grid[0] : left + o.grid[0])) : left;

                        }

                }

                return {

                        top: (

                                pageY -                                                                                                                                // The absolute mouse position

                                this.offset.click.top -                                                                                                        // Click offset (relative to the element)

                                this.offset.relative.top        -                                                                                        // Only for relative positioned nodes: Relative offset from element to offset parent

                                this.offset.parent.top +                                                                                                // The offsetParent's offset without borders (offset + border)

                                ( ( this.cssPosition === "fixed" ? -this.scrollParent.scrollTop() : ( scrollIsRootNode ? 0 : scroll.scrollTop() ) ))

                        ),

                        left: (

                                pageX -                                                                                                                                // The absolute mouse position

                                this.offset.click.left -                                                                                                // Click offset (relative to the element)

                                this.offset.relative.left        -                                                                                        // Only for relative positioned nodes: Relative offset from element to offset parent

                                this.offset.parent.left +                                                                                                // The offsetParent's offset without borders (offset + border)

                                ( ( this.cssPosition === "fixed" ? -this.scrollParent.scrollLeft() : scrollIsRootNode ? 0 : scroll.scrollLeft() ))

                        )

                };

        },

        _rearrange: function(event, i, a, hardRefresh) {

                a ? a[0].appendChild(this.placeholder[0]) : i.item[0].parentNode.insertBefore(this.placeholder[0], (this.direction === "down" ? i.item[0] : i.item[0].nextSibling));

                //Various things done here to improve the performance:

                // 1. we create a setTimeout, that calls refreshPositions

                // 2. on the instance, we have a counter variable, that get's higher after every append

                // 3. on the local scope, we copy the counter variable, and check in the timeout, if it's still the same

                // 4. this lets only the last addition to the timeout stack through

                this.counter = this.counter ? ++this.counter : 1;

                var counter = this.counter;

                this._delay(function() {

                        if(counter === this.counter) {