app/jquery/jquery-ui.draggable.js
author Lennard de Rijk <ljvderijk@gmail.com>
Fri, 24 Jul 2009 21:00:04 +0200
changeset 2678 a525a55833f1
parent 2420 645f4de26f99
child 2749 4e2789b8e86d
permissions -rw-r--r--
Send out a Notification upon creation of a new Request entity. The receivers are specified by the corresponding Role logic this Role Request is for. Currently Organization and Club Administrators will receive "new request" messages about respectively Mentor and Club Membership requests. Fixes Issue 442.

/*
 * jQuery UI Draggable 1.6
 *
 * Copyright (c) 2008 AUTHORS.txt (http://ui.jquery.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Draggables
 *
 * Depends:
 *	ui.core.js
 */
(function($) {

$.widget("ui.draggable", $.extend({}, $.ui.mouse, {

	_init: function() {

		if (this.options.helper == 'original' && !(/^(?:r|a|f)/).test(this.element.css("position")))
			this.element[0].style.position = 'relative';

		(this.options.cssNamespace && this.element.addClass(this.options.cssNamespace+"-draggable"));
		(this.options.disabled && this.element.addClass('ui-draggable-disabled'));

		this._mouseInit();

	},

	destroy: function() {
		if(!this.element.data('draggable')) return;
		this.element.removeData("draggable").unbind(".draggable").removeClass('ui-draggable ui-draggable-dragging ui-draggable-disabled');
		this._mouseDestroy();
	},

	_mouseCapture: function(event) {

		var o = this.options;

		if (this.helper || o.disabled || $(event.target).is('.ui-resizable-handle'))
			return false;

		//Quit if we're not on a valid handle
		this.handle = this._getHandle(event);
		if (!this.handle)
			return false;

		return true;

	},

	_mouseStart: function(event) {

		var o = this.options;

		//Create and append the visible helper
		this.helper = this._createHelper(event);

		//Cache the helper size
		this._cacheHelperProportions();

		//If ddmanager is used for droppables, set the global draggable
		if($.ui.ddmanager)
			$.ui.ddmanager.current = this;

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

		//Cache the margins of the original element
		this._cacheMargins();

		//Store the helper's css position
		this.cssPosition = this.helper.css("position");
		this.scrollParent = this.helper.scrollParent();

		//The element's absolute position on the page minus margins
		this.offset = this.element.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
		});

		//Adjust the mouse offset relative to the helper if 'cursorAt' is supplied
		if(o.cursorAt)
			this._adjustOffsetFromHelper(o.cursorAt);

		//Generate the original position
		this.originalPosition = this._generatePosition(event);

		//Set a containment if given in the options
		if(o.containment)
			this._setContainment();

		//Call plugins and callbacks
		this._propagate("start", event);

		//Recache the helper size
		this._cacheHelperProportions();

		//Prepare the droppable offsets
		if ($.ui.ddmanager && !o.dropBehaviour)
			$.ui.ddmanager.prepareOffsets(this, event);

		this.helper.addClass("ui-draggable-dragging");
		this._mouseDrag(event, true); //Execute the drag once - this causes the helper not to be visible before getting its correct position
		return true;
	},

	_mouseDrag: function(event, noPropagation) {

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

		//Call plugins and callbacks and use the resulting position if something is returned
		if(!noPropagation) this.position = this._propagate("drag", event) || this.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';
		if($.ui.ddmanager) $.ui.ddmanager.drag(this, event);

		return false;
	},

	_mouseStop: function(event) {

		//If we are using droppables, inform the manager about the drop
		var dropped = false;
		if ($.ui.ddmanager && !this.options.dropBehaviour)
			var dropped = $.ui.ddmanager.drop(this, event);

		if((this.options.revert == "invalid" && !dropped) || (this.options.revert == "valid" && dropped) || this.options.revert === true || ($.isFunction(this.options.revert) && this.options.revert.call(this.element, dropped))) {
			var self = this;
			$(this.helper).animate(this.originalPosition, parseInt(this.options.revertDuration, 10), function() {
				self._propagate("stop", event);
				self._clear();
			});
		} else {
			this._propagate("stop", event);
			this._clear();
		}

		return false;
	},

	_getHandle: function(event) {

		var handle = !this.options.handle || !$(this.options.handle, this.element).length ? true : false;
		$(this.options.handle, this.element)
			.find("*")
			.andSelf()
			.each(function() {
				if(this == event.target) handle = true;
			});

		return handle;

	},

	_createHelper: function(event) {

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

		if(!helper.parents('body').length)
			helper.appendTo((o.appendTo == 'parent' ? this.element[0].parentNode : o.appendTo));

		if(helper[0] != this.element[0] && !(/(fixed|absolute)/).test(helper.css("position")))
			helper.css("position", "absolute");

		return helper;

	},

	_adjustOffsetFromHelper: function(obj) {
		if(obj.left != undefined) this.offset.click.left = obj.left + this.margins.left;
		if(obj.right != undefined) this.offset.click.left = this.helperProportions.width - obj.right + this.margins.left;
		if(obj.top != undefined) this.offset.click.top = obj.top + this.margins.top;
		if(obj.bottom != undefined) this.offset.click.top = this.helperProportions.height - obj.bottom + this.margins.top;
	},

	_getParentOffset: function() {

		this.offsetParent = this.helper.offsetParent(); var po = this.offsetParent.offset();			//Get the offsetParent and cache its position

		if((this.offsetParent[0] == document.body && $.browser.mozilla)	//Ugly FF3 fix
		|| (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.element.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.element.css("marginLeft"),10) || 0),
			top: (parseInt(this.element.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 = [
			0 - this.offset.relative.left - this.offset.parent.left,
			0 - this.offset.relative.top - this.offset.parent.top,
			$(o.containment == 'document' ? document : window).width() - this.offset.relative.left - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.element.css("marginRight"),10) || 0),
			($(o.containment == 'document' ? document : window).height() || document.body.parentNode.scrollHeight) - this.offset.relative.top - 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($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left - this.margins.left,
				co.top + (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top - this.margins.top,
				co.left+(over ? Math.max(ce.scrollWidth,ce.offsetWidth) : ce.offsetWidth) - (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left - this.helperProportions.width - this.margins.left,
				co.top+(over ? Math.max(ce.scrollHeight,ce.offsetHeight) : ce.offsetHeight) - (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top - this.helperProportions.height - this.margins.top
			];
		}

	},

	_convertPositionTo: function(d, pos) {

		if(!pos) pos = this.position;
		var mod = d == "absolute" ? 1 : -1;
		var scroll = this[(this.cssPosition == 'absolute' ? 'offset' : 'scroll')+'Parent'], scrollIsRootNode = (/(html|body)/i).test(scroll[0].tagName);

		return {
			top: (
				pos.top																	// the calculated relative 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
				+ 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.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
				+ this.margins.left * mod												//Add the margin (you don't want the margin counting in intersection methods)
			)
		};
	},

	_generatePosition: function(event) {

		var o = this.options, scroll = this[(this.cssPosition == 'absolute' ? 'offset' : 'scroll')+'Parent'], scrollIsRootNode = (/(html|body)/i).test(scroll[0].tagName);

		var position = {
			top: (
				event.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: (
				event.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() )
			)
		};

		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;
	},

	_clear: function() {
		this.helper.removeClass("ui-draggable-dragging");
		if(this.helper[0] != this.element[0] && !this.cancelHelperRemoval) this.helper.remove();
		//if($.ui.ddmanager) $.ui.ddmanager.current = null;
		this.helper = null;
		this.cancelHelperRemoval = false;
	},

	// From now on bulk stuff - mainly helpers

	_propagate: function(n, event) {
		$.ui.plugin.call(this, n, [event, this._uiHash()]);
		if(n == "drag") this.positionAbs = this._convertPositionTo("absolute"); //The absolute position has to be recalculated after plugins
		return this.element.triggerHandler(n == "drag" ? n : "drag"+n, [event, this._uiHash()], this.options[n]);
	},

	plugins: {},

	_uiHash: function(event) {
		return {
			helper: this.helper,
			position: this.position,
			absolutePosition: this.positionAbs,
			options: this.options
		};
	}

}));

$.extend($.ui.draggable, {
	version: "1.6",
	defaults: {
		appendTo: "parent",
		axis: false,
		cancel: ":input",
		connectToSortable: false,
		containment: false,
		cssNamespace: "ui",
		cursor: "default",
		cursorAt: null,
		delay: 0,
		distance: 1,
		grid: false,
		handle: false,
		helper: "original",
		iframeFix: false,
		opacity: 1,
		refreshPositions: false,
		revert: false,
		revertDuration: 500,
		scope: "default",
		scroll: true,
		scrollSensitivity: 20,
		scrollSpeed: 20,
		snap: false,
		snapMode: "both",
		snapTolerance: 20,
		stack: false,
		zIndex: null
	}
});

$.ui.plugin.add("draggable", "connectToSortable", {
	start: function(event, ui) {

		var inst = $(this).data("draggable");
		inst.sortables = [];
		$(ui.options.connectToSortable).each(function() {
			// 'this' points to a string, and should therefore resolved as query, but instead, if the string is assigned to a variable, it loops through the strings properties,
			// so we have to append '' to make it anonymous again
			$(this+'').each(function() {
				if($.data(this, 'sortable')) {
					var sortable = $.data(this, 'sortable');
					inst.sortables.push({
						instance: sortable,
						shouldRevert: sortable.options.revert
					});
					sortable._refreshItems();	//Do a one-time refresh at start to refresh the containerCache
					sortable._propagate("activate", event, inst);
				}
			});
		});

	},
	stop: function(event, ui) {

		//If we are still over the sortable, we fake the stop event of the sortable, but also remove helper
		var inst = $(this).data("draggable");

		$.each(inst.sortables, function() {
			if(this.instance.isOver) {
				this.instance.isOver = 0;
				inst.cancelHelperRemoval = true; //Don't remove the helper in the draggable instance
				this.instance.cancelHelperRemoval = false; //Remove it in the sortable instance (so sortable plugins like revert still work)
				if(this.shouldRevert) this.instance.options.revert = true; //revert here
				this.instance._mouseStop(event);

				//Also propagate receive event, since the sortable is actually receiving a element
				this.instance.element.triggerHandler("sortreceive", [event, $.extend(this.instance._ui(), { sender: inst.element })], this.instance.options["receive"]);

				this.instance.options.helper = this.instance.options._helper;
				
				if(inst.options.helper == 'original') {
					this.instance.currentItem.css({ top: 'auto', left: 'auto' });
				}

			} else {
				this.instance.cancelHelperRemoval = false; //Remove the helper in the sortable instance
				this.instance._propagate("deactivate", event, inst);
			}

		});

	},
	drag: function(event, ui) {

		var inst = $(this).data("draggable"), self = this;

		var checkPos = function(o) {
			var dyClick = this.offset.click.top, dxClick = this.offset.click.left;
			var helperTop = this.positionAbs.top, helperLeft = this.positionAbs.left;
			var itemHeight = o.height, itemWidth = o.width;
			var itemTop = o.top, itemLeft = o.left;

			return $.ui.isOver(helperTop + dyClick, helperLeft + dxClick, itemTop, itemLeft, itemHeight, itemWidth);
		};

		$.each(inst.sortables, function(i) {

			if(checkPos.call(inst, this.instance.containerCache)) {

				//If it intersects, we use a little isOver variable and set it once, so our move-in stuff gets fired only once
				if(!this.instance.isOver) {
					this.instance.isOver = 1;
					//Now we fake the start of dragging for the sortable instance,
					//by cloning the list group item, appending it to the sortable and using it as inst.currentItem
					//We can then fire the start event of the sortable with our passed browser event, and our own helper (so it doesn't create a new one)
					this.instance.currentItem = $(self).clone().appendTo(this.instance.element).data("sortable-item", true);
					this.instance.options._helper = this.instance.options.helper; //Store helper option to later restore it
					this.instance.options.helper = function() { return ui.helper[0]; };

					event.target = this.instance.currentItem[0];
					this.instance._mouseCapture(event, true);
					this.instance._mouseStart(event, true, true);

					//Because the browser event is way off the new appended portlet, we modify a couple of variables to reflect the changes
					this.instance.offset.click.top = inst.offset.click.top;
					this.instance.offset.click.left = inst.offset.click.left;
					this.instance.offset.parent.left -= inst.offset.parent.left - this.instance.offset.parent.left;
					this.instance.offset.parent.top -= inst.offset.parent.top - this.instance.offset.parent.top;

					inst._propagate("toSortable", event);

				}

				//Provided we did all the previous steps, we can fire the drag event of the sortable on every draggable drag, when it intersects with the sortable
				if(this.instance.currentItem) this.instance._mouseDrag(event);

			} else {

				//If it doesn't intersect with the sortable, and it intersected before,
				//we fake the drag stop of the sortable, but make sure it doesn't remove the helper by using cancelHelperRemoval
				if(this.instance.isOver) {
					this.instance.isOver = 0;
					this.instance.cancelHelperRemoval = true;
					this.instance.options.revert = false; //No revert here
					this.instance._mouseStop(event, true);
					this.instance.options.helper = this.instance.options._helper;

					//Now we remove our currentItem, the list group clone again, and the placeholder, and animate the helper back to it's original size
					this.instance.currentItem.remove();
					if(this.instance.placeholder) this.instance.placeholder.remove();

					inst._propagate("fromSortable", event);
				}

			};

		});

	}
});

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

$.ui.plugin.add("draggable", "iframeFix", {
	start: function(event, ui) {
		$(ui.options.iframeFix === true ? "iframe" : ui.options.iframeFix).each(function() {
			$('<div class="ui-draggable-iframeFix" style="background: #fff;"></div>')
			.css({
				width: this.offsetWidth+"px", height: this.offsetHeight+"px",
				position: "absolute", opacity: "0.001", zIndex: 1000
			})
			.css($(this).offset())
			.appendTo("body");
		});
	},
	stop: function(event, ui) {
		$("div.ui-draggable-iframeFix").each(function() { this.parentNode.removeChild(this); }); //Remove frame helpers
	}
});

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

$.ui.plugin.add("draggable", "scroll", {
	start: function(event, ui) {
		var o = ui.options;
		var i = $(this).data("draggable");

		if(i.scrollParent[0] != document && i.scrollParent[0].tagName != 'HTML') i.overflowOffset = i.scrollParent.offset();

	},
	drag: function(event, ui) {

		var o = ui.options, scrolled = false;
		var i = $(this).data("draggable");

		if(i.scrollParent[0] != document && i.scrollParent[0].tagName != 'HTML') {

			if((i.overflowOffset.top + i.scrollParent[0].offsetHeight) - event.pageY < o.scrollSensitivity)
				i.scrollParent[0].scrollTop = scrolled = i.scrollParent[0].scrollTop + o.scrollSpeed;
			else if(event.pageY - i.overflowOffset.top < o.scrollSensitivity)
				i.scrollParent[0].scrollTop = scrolled = i.scrollParent[0].scrollTop - o.scrollSpeed;

			if((i.overflowOffset.left + i.scrollParent[0].offsetWidth) - event.pageX < o.scrollSensitivity)
				i.scrollParent[0].scrollLeft = scrolled = i.scrollParent[0].scrollLeft + o.scrollSpeed;
			else if(event.pageX - i.overflowOffset.left < o.scrollSensitivity)
				i.scrollParent[0].scrollLeft = scrolled = i.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(i, event);



		// 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(scrolled !== false && i.cssPosition == 'absolute' && i.scrollParent[0] != document && $.ui.contains(i.scrollParent[0], i.offsetParent[0])) {
			i.offset.parent = i._getParentOffset();
			
		}
		
		// 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(scrolled !== false && i.cssPosition == 'relative' && !(i.scrollParent[0] != document && i.scrollParent[0] != i.offsetParent[0])) {
			i.offset.relative = i._getRelativeOffset();
		}
		

	}
});

$.ui.plugin.add("draggable", "snap", {
	start: function(event, ui) {

		var inst = $(this).data("draggable");
		inst.snapElements = [];

		$(ui.options.snap.constructor != String ? ( ui.options.snap.items || ':data(draggable)' ) : ui.options.snap).each(function() {
			var $t = $(this); var $o = $t.offset();
			if(this != inst.element[0]) inst.snapElements.push({
				item: this,
				width: $t.outerWidth(), height: $t.outerHeight(),
				top: $o.top, left: $o.left
			});
		});

	},
	drag: function(event, ui) {

		var inst = $(this).data("draggable");
		var d = ui.options.snapTolerance;

		var x1 = ui.absolutePosition.left, x2 = x1 + inst.helperProportions.width,
			y1 = ui.absolutePosition.top, y2 = y1 + inst.helperProportions.height;

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

			var l = inst.snapElements[i].left, r = l + inst.snapElements[i].width,
				t = inst.snapElements[i].top, b = t + inst.snapElements[i].height;

			//Yes, I know, this is insane ;)
			if(!((l-d < x1 && x1 < r+d && t-d < y1 && y1 < b+d) || (l-d < x1 && x1 < r+d && t-d < y2 && y2 < b+d) || (l-d < x2 && x2 < r+d && t-d < y1 && y1 < b+d) || (l-d < x2 && x2 < r+d && t-d < y2 && y2 < b+d))) {
				if(inst.snapElements[i].snapping) (inst.options.snap.release && inst.options.snap.release.call(inst.element, event, $.extend(inst._uiHash(), { snapItem: inst.snapElements[i].item })));
				inst.snapElements[i].snapping = false;
				continue;
			}

			if(ui.options.snapMode != 'inner') {
				var ts = Math.abs(t - y2) <= d;
				var bs = Math.abs(b - y1) <= d;
				var ls = Math.abs(l - x2) <= d;
				var rs = Math.abs(r - x1) <= d;
				if(ts) ui.position.top = inst._convertPositionTo("relative", { top: t - inst.helperProportions.height, left: 0 }).top;
				if(bs) ui.position.top = inst._convertPositionTo("relative", { top: b, left: 0 }).top;
				if(ls) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: l - inst.helperProportions.width }).left;
				if(rs) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: r }).left;
			}

			var first = (ts || bs || ls || rs);

			if(ui.options.snapMode != 'outer') {
				var ts = Math.abs(t - y1) <= d;
				var bs = Math.abs(b - y2) <= d;
				var ls = Math.abs(l - x1) <= d;
				var rs = Math.abs(r - x2) <= d;
				if(ts) ui.position.top = inst._convertPositionTo("relative", { top: t, left: 0 }).top;
				if(bs) ui.position.top = inst._convertPositionTo("relative", { top: b - inst.helperProportions.height, left: 0 }).top;
				if(ls) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: l }).left;
				if(rs) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: r - inst.helperProportions.width }).left;
			}

			if(!inst.snapElements[i].snapping && (ts || bs || ls || rs || first))
				(inst.options.snap.snap && inst.options.snap.snap.call(inst.element, event, $.extend(inst._uiHash(), { snapItem: inst.snapElements[i].item })));
			inst.snapElements[i].snapping = (ts || bs || ls || rs || first);

		};

	}
});

$.ui.plugin.add("draggable", "stack", {
	start: function(event, ui) {
		var group = $.makeArray($(ui.options.stack.group)).sort(function(a,b) {
			return (parseInt($(a).css("zIndex"),10) || ui.options.stack.min) - (parseInt($(b).css("zIndex"),10) || ui.options.stack.min);
		});

		$(group).each(function(i) {
			this.style.zIndex = ui.options.stack.min + i;
		});

		this[0].style.zIndex = ui.options.stack.min + group.length;
	}
});

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

})(jQuery);