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/*

 * jQuery UI Sortable 1.8.5

 *

 * Copyright 2010, AUTHORS.txt (http://jqueryui.com/about)

 * Dual licensed under the MIT or GPL Version 2 licenses.

 * http://jquery.org/license

 *

 * http://docs.jquery.com/UI/Sortables

 *

 * Depends:

 *	jquery.ui.core.js

 *	jquery.ui.mouse.js

 *	jquery.ui.widget.js

 */

(function( $, undefined ) {

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

	widgetEventPrefix: "sort",

	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

	},

	_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 floating

		this.floating = this.items.length ? (/left|right/).test(this.items[0].item.css('float')) : false;

		//Let's determine the parent's offset

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

		//Initialize mouse events for interaction

		this._mouseInit();

	},

	destroy: function() {

		this.element

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

			.removeData("sortable")

			.unbind(".sortable");

		this._mouseDestroy();

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

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

		return this;

	},

	_setOption: function(key, value){

		if ( key === "disabled" ) {

			this.options[ key ] = value;

			this.widget()

				[ value ? "addClass" : "removeClass"]( "ui-sortable-disabled" );

		} 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) {

		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

		var currentItem = null, self = this, nodes = $(event.target).parents().each(function() {

			if($.data(this, 'sortable-item') == self) {

				currentItem = $(this);

				return false;

			}

		});

		if($.data(event.target, 'sortable-item') == self) currentItem = $(event.target);

		if(!currentItem) return false;

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

			var validHandle = false;

			$(this.options.handle, currentItem).find("*").andSelf().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 o = this.options, self = this;

		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

		};

		// 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");

		$.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

		});

		//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) { // cursor option

			if ($('body').css("cursor")) this._storedCursor = $('body').css("cursor");

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

		}

		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 (var i = this.containers.length - 1; i >= 0; i--) { this.containers[i]._trigger("activate", event, self._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) {

		//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) {

			var o = this.options, scrolled = false;

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

			//Cache variables and intersection, continue if no intersection

			var item = this.items[i], itemElement = item.item[0], intersection = this._intersectsWithPointer(item);

			if (!intersection) continue;

			if(itemElement != this.currentItem[0] //cannot intersect with itself

				&&	this.placeholder[intersection == 1 ? "next" : "prev"]()[0] != itemElement //no useless actions that have been done before

				&&	!$.ui.contains(this.placeholder[0], itemElement) //no action if the item moved is the parent of the item checked

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

				//&& itemElement.parentNode == this.placeholder[0].parentNode // only rearrange items within the same container

			) {

				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 self = this;

			var cur = self.placeholder.offset();

			self.reverting = true;

			$(this.helper).animate({

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

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

			}, parseInt(this.options.revert, 10) || 500, function() {

				self._clear(event);

			});

		} else {

			this._clear(event, noPropagation);

		}

		return false;

	},

	cancel: function() {

		var self = this;

		if(this.dragging) {

			this._mouseUp();

			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, self._uiHash(this));

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

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

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

				}

			}

		}

		//$(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);

		var 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);

		var 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;

		var l = item.left,

			r = l + item.width,

			t = item.top,

			b = t + item.height;

		var dyClick = this.offset.click.top,

			dxClick = this.offset.click.left;

		var 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 = $.ui.isOverAxis(this.positionAbs.top + this.offset.click.top, item.top, item.height),

			isOverElementWidth = $.ui.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 = $.ui.isOverAxis(this.positionAbs.top + this.offset.click.top, item.top + (item.height/2), item.height),

			isOverRightHalf = $.ui.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 self = this;

		var items = [];

		var queries = [];

		var connectWith = this._connectWith();

		if(connectWith && connected) {

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

				var cur = $(connectWith[i]);

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

					var inst = $.data(cur[j], 'sortable');

					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 (var 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(sortable-item)");

		for (var i=0; i < this.items.length; i++) {

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

				if(list[j] == this.items[i].item[0])

					this.items.splice(i,1);

			};

		};

	},

	_refreshItems: function(event) {

		this.items = [];

		this.containers = [this];

		var items = this.items;

		var self = this;

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

		var connectWith = this._connectWith();

		if(connectWith) {

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

				var cur = $(connectWith[i]);

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

					var inst = $.data(cur[j], 'sortable');

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

			var targetData = queries[i][1];

			var _queries = queries[i][0];

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

				var item = $(_queries[j]);

				item.data('sortable-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();

		}

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

			var item = this.items[i];

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

			if (!fast) {

				item.width = t.outerWidth();

				item.height = t.outerHeight();

			}

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

				var 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) {

		var self = that || this, o = self.options;

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

			var className = o.placeholder;

			o.placeholder = {

				element: function() {

					var el = $(document.createElement(self.currentItem[0].nodeName))

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

						.removeClass("ui-sortable-helper")[0];

					if(!className)

						el.style.visibility = "hidden";

					return el;

				},

				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(self.currentItem.innerHeight() - parseInt(self.currentItem.css('paddingTop')||0, 10) - parseInt(self.currentItem.css('paddingBottom')||0, 10)); };

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

				}

			};

		}

		//Create the placeholder

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

		//Append it after the actual current item

		self.currentItem.after(self.placeholder);

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

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

	},

	_contactContainers: function(event) {

		// get innermost container that intersects with item

		var innermostContainer = null, innermostIndex = null;

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

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

			if($.ui.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 && $.ui.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) {

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

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

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

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

			var dist = 10000; var itemWithLeastDistance = null; var base = this.positionAbs[this.containers[innermostIndex].floating ? 'left' : 'top'];

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

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

				var cur = this.items[j][this.containers[innermostIndex].floating ? 'left' : 'top'];

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

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

				}

			}

			if(!itemWithLeastDistance && !this.options.dropOnEmpty) //Check if dropOnEmpty is enabled

				return;

			this.currentContainer = this.containers[innermostIndex];

			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));

			//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;

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

		if(!helper.parents('body').length) //Add the helper to the DOM if that didn't happen already

			$(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 && $.ui.contains(this.scrollParent[0], this.offsetParent[0])) {

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

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

		}

		if((this.offsetParent[0] == document.body) //This needs to be actually done for all browsers, since pageX/pageY includes this information

		|| (this.offsetParent[0].tagName && this.offsetParent[0].tagName.toLowerCase() == 'html' && $.browser.msie)) //Ugly IE fix

			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 o = this.options;

		if(o.containment == 'parent') o.containment = this.helper[0].parentNode;

		if(o.containment == 'document' || o.containment == 'window') this.containment = [

			$(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)) {

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

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

			var 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;

		var o = this.options, scroll = this.cssPosition == 'absolute' && !(this.scrollParent[0] != document && $.ui.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)

				- ($.browser.safari && this.cssPosition == 'fixed' ? 0 : ( 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)

				- ($.browser.safari && this.cssPosition == 'fixed' ? 0 : ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollLeft() : scrollIsRootNode ? 0 : scroll.scrollLeft() ) * mod)

			)

		};

	},

	_generatePosition: function(event) {

		var o = this.options, scroll = this.cssPosition == 'absolute' && !(this.scrollParent[0] != document && $.ui.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();

		}

		var pageX = event.pageX;

		var pageY = event.pageY;

		/*

		 * - 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) {

				var 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;

				var 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)

				+ ($.browser.safari && this.cssPosition == 'fixed' ? 0 : ( 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)

				+ ($.browser.safari && this.cssPosition == 'fixed' ? 0 : ( 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 self = this, counter = this.counter;

		window.setTimeout(function() {

			if(counter == self.counter) self.refreshPositions(!hardRefresh); //Precompute after each DOM insertion, NOT on mousemove

		},0);

	},

	_clear: function(event, noPropagation) {

		this.reverting = false;

		// We delay all events that have to be triggered to after the point where the placeholder has been removed and

		// everything else normalized again

		var delayedTriggers = [], self = this;

		// We first have to update the dom position of the actual currentItem

		// Note: don't do it if the current item is already removed (by a user), or it gets reappended (see #4088)

		if(!this._noFinalSort && this.currentItem[0].parentNode) this.placeholder.before(this.currentItem);

		this._noFinalSort = null;

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

			for(var i in this._storedCSS) {

				if(this._storedCSS[i] == 'auto' || this._storedCSS[i] == 'static') this._storedCSS[i] = '';

			}

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

		} else {

			this.currentItem.show();

		}

		if(this.fromOutside && !noPropagation) delayedTriggers.push(function(event) { this._trigger("receive", event, this._uiHash(this.fromOutside)); });

		if((this.fromOutside || this.domPosition.prev != this.currentItem.prev().not(".ui-sortable-helper")[0] || this.domPosition.parent != this.currentItem.parent()[0]) && !noPropagation) delayedTriggers.push(function(event) { this._trigger("update", event, this._uiHash()); }); //Trigger update callback if the DOM position has changed

		if(!$.ui.contains(this.element[0], this.currentItem[0])) { //Node was moved out of the current element

			if(!noPropagation) delayedTriggers.push(function(event) { this._trigger("remove", event, this._uiHash()); });

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

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

					delayedTriggers.push((function(c) { return function(event) { c._trigger("receive", event, this._uiHash(this)); };  }).call(this, this.containers[i]));

					delayedTriggers.push((function(c) { return function(event) { c._trigger("update", event, this._uiHash(this));  }; }).call(this, this.containers[i]));

				}

			};

		};

		//Post events to containers

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

			if(!noPropagation) delayedTriggers.push((function(c) { return function(event) { c._trigger("deactivate", event, this._uiHash(this)); };  }).call(this, this.containers[i]));

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

				delayedTriggers.push((function(c) { return function(event) { c._trigger("out", event, this._uiHash(this)); };  }).call(this, this.containers[i]));

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

			}

		}

		//Do what was originally in plugins