path: root/ui/ui.sortable.js

/*
 * jQuery UI Sortable @VERSION
 *
 * Copyright (c) 2008 Paul Bakaus
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * http://docs.jquery.com/UI/Sortables
 *
 * Depends:
 *	ui.core.js
 */
(function($) {

function contains(a, b) { 
    var safari2 = $.browser.safari && $.browser.version < 522; 
    if (a.contains && !safari2) { 
        return a.contains(b); 
    } 
    if (a.compareDocumentPosition) 
        return !!(a.compareDocumentPosition(b) & 16); 
    while (b = b.parentNode) 
          if (b == a) return true; 
    return false; 
};

$.widget("ui.sortable", $.extend({}, $.ui.mouse, {
	_init: 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();
		
	},
	plugins: {},
	ui: function(inst) {
		return {
			helper: (inst || this)["helper"],
			placeholder: (inst || this)["placeholder"] || $([]),
			position: (inst || this)["position"],
			absolutePosition: (inst || this)["positionAbs"],
			options: this.options,
			element: this.element,
			item: (inst || this)["currentItem"],
			sender: inst ? inst.element : null
		};		
	},
	
	_propagate: function(n,e,inst, noPropagation) {
		$.ui.plugin.call(this, n, [e, this.ui(inst)]);
		if(!noPropagation) this.element.triggerHandler(n == "sort" ? n : "sort"+n, [e, this.ui(inst)], this.options[n]);
	},
	
	serialize: function(o) {

		var items = this._getItemsAsjQuery(o && o.connected);
		var str = []; o = o || {};
		
		$(items).each(function() {
			var res = ($(this.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]));
		});
		
		return str.join('&');
		
	},
	
	toArray: function(o) {
		
		var items = this._getItemsAsjQuery(o && o.connected);
		var ret = [];

		items.each(function() { ret.push($(this).attr(o.attr || '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 == "guess" && 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
		
		}
	},
	
	_intersectsWithEdge: 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.tolerance == "guess" && this.helperProportions[this.floating ? 'width' : 'height'] > item[this.floating ? 'width' : 'height'])) {
			if(!isOverElement) return false;

			if(this.floating) {
				if ((x1 + dxClick) > l && (x1 + dxClick) < l + item.width/2) return 2;
				if ((x1 + dxClick) > l + item.width/2 && (x1 + dxClick) < r) return 1;
			} else {
				var height = item.height;
				var direction = y1 - this.updateOriginalPosition.top < 0 ? 2 : 1; // 2 = up
				
				if (direction == 1 && (y1 + dyClick) < t + height/2) { return 2; } // up
				else if (direction == 2 && (y1 + dyClick) > t + height/2) { return 1; } // down
			}

		} else {
			if (!(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 )) return false; // Top Half
			
			if(this.floating) {
				if(x2 > l && x1 < l) return 2; //Crosses left edge
				if(x1 < r && x2 > r) return 1; //Crosses right edge
			} else {
				if(y2 > t && y1 < t) return 1; //Crosses top edge
				if(y1 < b && y2 > b) return 2; //Crosses bottom edge
			}
		}
		
		return false;
		
	},
	
	refresh: function() {
		this._refreshItems();
		this.refreshPositions();
	},
	
	_getItemsAsjQuery: function(connected) {
		
		var self = this;
		var items = [];
		var queries = [];
	
		if(this.options.connectWith && connected) {
			for (var i = this.options.connectWith.length - 1; i >= 0; i--){
				var cur = $(this.options.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"), 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"), 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() {
		
		this.items = [];
		this.containers = [this];
		var items = this.items;
		var self = this;
		var queries = [[$.isFunction(this.options.items) ? this.options.items.call(this.element, null, { options: this.options, item: this.currentItem }) : $(this.options.items, this.element), this]];
	
		if(this.options.connectWith) {
			for (var i = this.options.connectWith.length - 1; i >= 0; i--){
				var cur = $(this.options.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), inst]);
						this.containers.push(inst);
					}
				};
			};
		}

		for (var i = queries.length - 1; i >= 0; i--){
			queries[i][0].each(function() {
				$.data(this, 'sortable-item', queries[i][1]); // Data for target checking (mouse manager)
				items.push({
					item: $(this),
					instance: queries[i][1],
					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) {
			var po = this.offsetParent.offset();
			this.offset.parent = { top: po.top + this.offsetParentBorders.top, left: po.left + this.offsetParentBorders.left };
		}

		for (var i = this.items.length - 1; i >= 0; i--){		
			
			//We ignore calculating positions of all connected containers when we're not over them
			if(this.items[i].instance != this.currentContainer && this.currentContainer && this.items[i].item[0] != this.currentItem[0])
				continue;
				
			var t = this.options.toleranceElement ? $(this.options.toleranceElement, this.items[i].item) : this.items[i].item;
			
			if(!fast) {
				this.items[i].width = t[0].offsetWidth;
				this.items[i].height = t[0].offsetHeight;
			}
			
			var p = t.offset();
			this.items[i].left = p.left;
			this.items[i].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();
			};
		}

	},
	
	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");
	},
	
	_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 || "ui-sortable-placeholder")[0];
					if(!className) { el.style.visibility = "hidden"; el.innerHTML = self.currentItem[0].innerHTML; };
					return el;
				},
				update: function(container, p) {
					if(className && !o.forcePlaceholderSize) return;
					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)); };
				}
			};
		}
		
		self.placeholder = $(o.placeholder.element.call(self.element, self.currentItem)).appendTo(self.currentItem.parent());
		self.currentItem.before(self.placeholder);
		o.placeholder.update(self, self.placeholder);

	},
	
	_contactContainers: function(e) {
		for (var i = this.containers.length - 1; i >= 0; i--){

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

					if(this.currentContainer != this.containers[i]) {
						
						//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[i].floating ? 'left' : 'top'];
						for (var j = this.items.length - 1; j >= 0; j--) {
							if(!contains(this.containers[i].element[0], this.items[j].item[0])) continue;
							var cur = this.items[j][this.containers[i].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
							continue;
						
						this.currentContainer = this.containers[i];
						itemWithLeastDistance ? this.options.sortIndicator.call(this, e, itemWithLeastDistance, null, true) : this.options.sortIndicator.call(this, e, null, this.containers[i].element, true);
						this._propagate("change", e); //Call plugins and callbacks
						this.containers[i]._propagate("change", e, this); //Call plugins and callbacks
						
						//Update the placeholder
						this.options.placeholder.update(this.currentContainer, this.placeholder);

					}
					
					this.containers[i]._propagate("over", e, this);
					this.containers[i].containerCache.over = 1;
				}
			} else {
				if(this.containers[i].containerCache.over) {
					this.containers[i]._propagate("out", e, this);
					this.containers[i].containerCache.over = 0;
				}
			}
			
		};			
	},
	
	_mouseCapture: function(e, overrideHandle) {

		if(this.options.disabled || this.options.type == 'static') return false;

		//We have to refresh the items data once first
		this._refreshItems();

		//Find out if the clicked node (or one of its parents) is a actual item in this.items
		var currentItem = null, self = this, nodes = $(e.target).parents().each(function() {	
			if($.data(this, 'sortable-item') == self) {
				currentItem = $(this);
				return false;
			}
		});
		if($.data(e.target, 'sortable-item') == self) currentItem = $(e.target);

		if(!currentItem) return false;
		if(this.options.handle && !overrideHandle) {
			var validHandle = false;
			
			$(this.options.handle, currentItem).find("*").andSelf().each(function() { if(this == e.target) validHandle = true; });
			if(!validHandle) return false;
		}
			
		this.currentItem = currentItem;
		this._removeCurrentsFromItems();
		return true;	
			
	},
	
	createHelper: function() {
		
		var o = this.options;
		var helper = typeof o.helper == 'function' ? $(o.helper.apply(this.element[0], [e, this.currentItem])) : (o.helper == "original" ? this.currentItem :  this.currentItem.clone());
		
		if (!helper.parents('body').length)
			$(o.appendTo != 'parent' ? o.appendTo : this.currentItem[0].parentNode)[0].appendChild(helper[0]); //Add the helper to the DOM if that didn't happen already
			
		return helper;

	},
	
	_mouseStart: function(e, overrideHandle, noActivation) {

		var 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();		

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

		this.margins = {																				//Cache the margins
			left: (parseInt(this.currentItem.css("marginLeft"),10) || 0),
			top: (parseInt(this.currentItem.css("marginTop"),10) || 0)
		};		
	
		this.offset = this.currentItem.offset();														//The element's absolute position on the page
		this.offset = {																					//Substract the margins from the element's absolute offset
			top: this.offset.top - this.margins.top,
			left: this.offset.left - this.margins.left
		};
		
		this.offset.click = {																			//Where the click happened, relative to the element
			left: e.pageX - this.offset.left,
			top: e.pageY - this.offset.top
		};
		
		this.offsetParent = this.helper.offsetParent();													//Get the offsetParent and cache its position
		var po = this.offsetParent.offset();			

		this.offsetParentBorders = {
			top: (parseInt(this.offsetParent.css("borderTopWidth"),10) || 0),
			left: (parseInt(this.offsetParent.css("borderLeftWidth"),10) || 0)
		};
		
		this.offset.parent = {																			//Store its position plus border
			top: po.top + this.offsetParentBorders.top,
			left: po.left + this.offsetParentBorders.left
		};
	
		this.updateOriginalPosition = this.originalPosition = this._generatePosition(e);				//Generate the original position
		this.domPosition = { prev: this.currentItem.prev()[0], parent: this.currentItem.parent()[0] };  //Cache the former DOM position
		
		//If o.placeholder is used, create a new element at the given position with the class
		this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() };//Cache the helper size


		if(o.helper == "original") {
			this._storedCSS = { position: this.currentItem.css("position"), top: this.currentItem.css("top"), left: this.currentItem.css("left"), clear: this.currentItem.css("clear") };
		} else {
			this.currentItem.hide(); //Hide the original, won't cause anything bad this way
		}

		//Position it absolutely and add a helper class
		this.helper
			.css({ position: 'absolute', clear: 'both' })
			.addClass('ui-sortable-helper');
		
		//Create the placeholder	
		this._createPlaceholder();

		//Call plugins and callbacks
		this._propagate("start", e);
		
		//Recache the helper size
		if(!this._preserveHelperProportions)
			this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() };
		
		if(o.cursorAt) {
			if(o.cursorAt.left != undefined) this.offset.click.left = o.cursorAt.left;
			if(o.cursorAt.right != undefined) this.offset.click.left = this.helperProportions.width - o.cursorAt.right;
			if(o.cursorAt.top != undefined) this.offset.click.top = o.cursorAt.top;
			if(o.cursorAt.bottom != undefined) this.offset.click.top = this.helperProportions.height - o.cursorAt.bottom;
		}

		/*
		 * - Position constraining -
		 * Here we prepare position constraining like grid and containment.
		 */	
		
		if(o.containment) {
			if(o.containment == 'parent') o.containment = this.helper[0].parentNode;
			if(o.containment == 'document' || o.containment == 'window') this.containment = [
				0 - this.offset.parent.left,
				0 - this.offset.parent.top,
				$(o.containment == 'document' ? document : window).width() - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.element.css("marginRight"),10) || 0),
				($(o.containment == 'document' ? document : window).height() || document.body.parentNode.scrollHeight) - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.element.css("marginBottom"),10) || 0)
			];

			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($(ce).css("borderLeftWidth"),10) || 0) - this.offset.parent.left,
					co.top + (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.parent.top,
					co.left+(over ? Math.max(ce.scrollWidth,ce.offsetWidth) : ce.offsetWidth) - (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.currentItem.css("marginRight"),10) || 0),
					co.top+(over ? Math.max(ce.scrollHeight,ce.offsetHeight) : ce.offsetHeight) - (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.currentItem.css("marginBottom"),10) || 0)
				];
			}
		}
		
		//Post 'activate' events to possible containers
		if(!noActivation) {
			 for (var i = this.containers.length - 1; i >= 0; i--) { this.containers[i]._propagate("activate", e, this); }
		}
		
		//Prepare possible droppables
		if($.ui.ddmanager)
			$.ui.ddmanager.current = this;
		
		if ($.ui.ddmanager && !o.dropBehaviour)
			$.ui.ddmanager.prepareOffsets(this, e);

		this.dragging = true;

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


	},
	
	_convertPositionTo: function(d, pos) {
		if(!pos) pos = this.position;
		var mod = d == "absolute" ? 1 : -1;
		return {
			top: (
				pos.top																	// the calculated relative position
				+ this.offset.parent.top * mod											// The offsetParent's offset without borders (offset + border)
				- (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollTop) * mod	// The offsetParent's scroll position
				+ this.margins.top * mod												//Add the margin (you don't want the margin counting in intersection methods)
			),
			left: (
				pos.left																// the calculated relative position
				+ this.offset.parent.left * mod											// The offsetParent's offset without borders (offset + border)
				- (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollLeft) * mod	// The offsetParent's scroll position
				+ this.margins.left * mod												//Add the margin (you don't want the margin counting in intersection methods)
			)
		};
	},
	
	_generatePosition: function(e) {
		
		var o = this.options;
		var position = {
			top: (
				e.pageY																	// The absolute mouse position
				- this.offset.click.top													// Click offset (relative to the element)
				- this.offset.parent.top												// The offsetParent's offset without borders (offset + border)
				+ (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollTop)	// The offsetParent's scroll position, not if the element is fixed
			),
			left: (
				e.pageX																	// The absolute mouse position
				- this.offset.click.left												// Click offset (relative to the element)
				- this.offset.parent.left												// The offsetParent's offset without borders (offset + border)
				+ (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollLeft)	// The offsetParent's scroll position, not if the element is fixed
			)
		};
		
		if(!this.originalPosition) return position;										//If we are not dragging yet, we won't check for options
		
		/*
		 * - Position constraining -
		 * Constrain the position to a mix of grid, containment.
		 */
		if(this.containment) {
			if(position.left < this.containment[0]) position.left = this.containment[0];
			if(position.top < this.containment[1]) position.top = this.containment[1];
			if(position.left > this.containment[2]) position.left = this.containment[2];
			if(position.top > this.containment[3]) position.top = this.containment[3];
		}
		
		if(o.grid) {
			var top = this.originalPosition.top + Math.round((position.top - this.originalPosition.top) / o.grid[1]) * o.grid[1];
			position.top = this.containment ? (!(top < this.containment[1] || top > this.containment[3]) ? top : (!(top < this.containment[1]) ? top - o.grid[1] : top + o.grid[1])) : top;
			
			var left = this.originalPosition.left + Math.round((position.left - this.originalPosition.left) / o.grid[0]) * o.grid[0];
			position.left = this.containment ? (!(left < this.containment[0] || left > this.containment[2]) ? left : (!(left < this.containment[0]) ? left - o.grid[0] : left + o.grid[0])) : left;
		}
		
		return position;
	},
	
	_mouseDrag: function(e) {

		//Compute the helpers position
		this.position = this._generatePosition(e);
		this.positionAbs = this._convertPositionTo("absolute");

		//Call the internal plugins
		$.ui.plugin.call(this, "sort", [e, this.ui()]);
		
		//Regenerate the absolute position used for position checks
		this.positionAbs = this._convertPositionTo("absolute");
		
		//Set the helper's position
		this.helper[0].style.left = this.position.left+'px';
		this.helper[0].style.top = this.position.top+'px';

		//Rearrange
		for (var i = this.items.length - 1; i >= 0; i--) {
			var intersection = this._intersectsWithEdge(this.items[i]);
			if(!intersection) continue;
			
			if(this.items[i].item[0] != this.currentItem[0] //cannot intersect with itself
				&&	this.placeholder[intersection == 1 ? "next" : "prev"]()[0] != this.items[i].item[0] //no useless actions that have been done before
				&&	!contains(this.placeholder[0], this.items[i].item[0]) //no action if the item moved is the parent of the item checked
				&& (this.options.type == 'semi-dynamic' ? !contains(this.element[0], this.items[i].item[0]) : true)
			) {
				
				this.updateOriginalPosition = this._generatePosition(e);
				
				this.direction = intersection == 1 ? "down" : "up";
				this.options.sortIndicator.call(this, e, this.items[i]);
				this._propagate("change", e); //Call plugins and callbacks
				break;
			}
		}
		
		//Post events to containers
		this._contactContainers(e);
		
		//Interconnect with droppables
		if($.ui.ddmanager) $.ui.ddmanager.drag(this, e);

		//Call callbacks
		this.element.triggerHandler("sort", [e, this.ui()], this.options["sort"]);

		return false;
		
	},
	
	_rearrange: function(e, 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);

	},
	
	_mouseStop: function(e, noPropagation) {

		//If we are using droppables, inform the manager about the drop
		if ($.ui.ddmanager && !this.options.dropBehaviour)
			$.ui.ddmanager.drop(this, e);
			
		if(this.options.revert) {
			var self = this;
			var cur = self.placeholder.offset();

			$(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(e);
			});
		} else {
			this._clear(e, noPropagation);
		}

		return false;
		
	},
	
	_clear: function(e, noPropagation) {

		//We first have to update the dom position of the actual currentItem
		if(!this._noFinalSort) this.placeholder.before(this.currentItem);
		this._noFinalSort = null;

		if(this.options.helper == "original")
			this.currentItem.css(this._storedCSS).removeClass("ui-sortable-helper");
		else
			this.currentItem.show();

		if(this.domPosition.prev != this.currentItem.prev().not(".ui-sortable-helper")[0] || this.domPosition.parent != this.currentItem.parent()[0]) this._propagate("update", e, null, noPropagation); //Trigger update callback if the DOM position has changed
		if(!contains(this.element[0], this.currentItem[0])) { //Node was moved out of the current element
			this._propagate("remove", e, null, noPropagation);
			for (var i = this.containers.length - 1; i >= 0; i--){
				if(contains(this.containers[i].element[0], this.currentItem[0])) {
					this.containers[i]._propagate("update", e, this, noPropagation);
					this.containers[i]._propagate("receive", e, this, noPropagation);
				}
			};
		};
		
		//Post events to containers
		for (var i = this.containers.length - 1; i >= 0; i--){
			this.containers[i]._propagate("deactivate", e, this, noPropagation);
			if(this.containers[i].containerCache.over) {
				this.containers[i]._propagate("out", e, this);
				this.containers[i].containerCache.over = 0;
			}
		}
		
		this.dragging = false;
		if(this.cancelHelperRemoval) {
			this._propagate("beforeStop", e, null, noPropagation);
			this._propagate("stop", e, null, noPropagation);
			return false;
		}
		
		this._propagate("beforeStop", e, null, noPropagation);
		
		this.placeholder.remove();
		if(this.options.helper != "original") this.helper.remove(); this.helper = null;
		this._propagate("stop", e, null, noPropagation);
		
		return true;
		
	}
}));

$.extend($.ui.sortable, {
	getter: "serialize toArray",
	defaults: {
		helper: "original",
		tolerance: "guess",
		distance: 1,
		delay: 0,
		scroll: true,
		scrollSensitivity: 20,
		scrollSpeed: 20,
		cancel: ":input",
		items: '> *',
		zIndex: 1000,
		dropOnEmpty: true,
		appendTo: "parent",
		sortIndicator: $.ui.sortable.prototype._rearrange,
		scope: "default"
	}
});

/*
 * Sortable Extensions
 */

$.ui.plugin.add("sortable", "cursor", {
	start: function(e, ui) {
		var t = $('body');
		if (t.css("cursor")) ui.options._cursor = t.css("cursor");
		t.css("cursor", ui.options.cursor);
	},
	beforeStop: function(e, ui) {
		if (ui.options._cursor) $('body').css("cursor", ui.options._cursor);
	}
});

$.ui.plugin.add("sortable", "zIndex", {
	start: function(e, ui) {
		var t = ui.helper;
		if(t.css("zIndex")) ui.options._zIndex = t.css("zIndex");
		t.css('zIndex', ui.options.zIndex);
	},
	beforeStop: function(e, ui) {
		if(ui.options._zIndex) $(ui.helper).css('zIndex', ui.options._zIndex);
	}
});

$.ui.plugin.add("sortable", "opacity", {
	start: function(e, ui) {
		var t = ui.helper;
		if(t.css("opacity")) ui.options._opacity = t.css("opacity");
		t.css('opacity', ui.options.opacity);
	},
	beforeStop: function(e, ui) {
		if(ui.options._opacity) $(ui.helper).css('opacity', ui.options._opacity);
	}
});

$.ui.plugin.add("sortable", "scroll", {
	start: function(e, ui) {
		var o = ui.options;
		var i = $(this).data("sortable");
	
		i.overflowY = function(el) {
			do { if(/auto|scroll/.test(el.css('overflow')) || (/auto|scroll/).test(el.css('overflow-y'))) return el; el = el.parent(); } while (el[0].parentNode);
			return $(document);
		}(i.currentItem);
		i.overflowX = function(el) {
			do { if(/auto|scroll/.test(el.css('overflow')) || (/auto|scroll/).test(el.css('overflow-x'))) return el; el = el.parent(); } while (el[0].parentNode);
			return $(document);
		}(i.currentItem);
		
		if(i.overflowY[0] != document && i.overflowY[0].tagName != 'HTML') i.overflowYOffset = i.overflowY.offset();
		if(i.overflowX[0] != document && i.overflowX[0].tagName != 'HTML') i.overflowXOffset = i.overflowX.offset();
		
	},
	sort: function(e, ui) {
		
		var o = ui.options;
		var i = $(this).data("sortable");
		
		if(i.overflowY[0] != document && i.overflowY[0].tagName != 'HTML') {
			if((i.overflowYOffset.top + i.overflowY[0].offsetHeight) - e.pageY < o.scrollSensitivity)
				i.overflowY[0].scrollTop = i.overflowY[0].scrollTop + o.scrollSpeed;
			if(e.pageY - i.overflowYOffset.top < o.scrollSensitivity)
				i.overflowY[0].scrollTop = i.overflowY[0].scrollTop - o.scrollSpeed;
		} else {
			if(e.pageY - $(document).scrollTop() < o.scrollSensitivity)
				$(document).scrollTop($(document).scrollTop() - o.scrollSpeed);
			if($(window).height() - (e.pageY - $(document).scrollTop()) < o.scrollSensitivity)
				$(document).scrollTop($(document).scrollTop() + o.scrollSpeed);
		}
		
		if(i.overflowX[0] != document && i.overflowX[0].tagName != 'HTML') {
			if((i.overflowXOffset.left + i.overflowX[0].offsetWidth) - e.pageX < o.scrollSensitivity)
				i.overflowX[0].scrollLeft = i.overflowX[0].scrollLeft + o.scrollSpeed;
			if(e.pageX - i.overflowXOffset.left < o.scrollSensitivity)
				i.overflowX[0].scrollLeft = i.overflowX[0].scrollLeft - o.scrollSpeed;
		} else {
			if(e.pageX - $(document).scrollLeft() < o.scrollSensitivity)
				$(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);
			if($(window).width() - (e.pageX - $(document).scrollLeft()) < o.scrollSensitivity)
				$(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);
		}
		
	}
});

$.ui.plugin.add("sortable", "axis", {
	sort: function(e, ui) {
		
		var i = $(this).data("sortable");
		
		if(ui.options.axis == "y") i.position.left = i.originalPosition.left;
		if(ui.options.axis == "x") i.position.top = i.originalPosition.top;
		
	}
});

})(jQuery);