/*

 * jQuery UI Draggable 1.8.1

 *

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

 * Dual licensed under the MIT (MIT-LICENSE.txt)

 * and GPL (GPL-LICENSE.txt) licenses.

 *

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

 *

 * Depends:

 *	jquery.ui.core.js

 *	jquery.ui.mouse.js

 *	jquery.ui.widget.js

 */

(function($) {

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

	widgetEventPrefix: "drag",

	options: {

		addClasses: true,

		appendTo: "parent",

		axis: false,

		connectToSortable: false,

		containment: false,

		cursor: "auto",

		cursorAt: false,

		grid: false,

		handle: false,

		helper: "original",

		iframeFix: false,

		opacity: false,

		refreshPositions: false,

		revert: false,

		revertDuration: 500,

		scope: "default",

		scroll: true,

		scrollSensitivity: 20,

		scrollSpeed: 20,

		snap: false,

		snapMode: "both",

		snapTolerance: 20,

		stack: false,

		zIndex: false

	},

	_create: function() {

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

			this.element[0].style.position = 'relative';

		(this.options.addClasses && this.element.addClass("ui-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();

		return this;

	},

	_mouseCapture: function(event) {

		var o = this.options;

		// among others, prevent a drag on a resizable-handle

		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.positionAbs = 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

		});

		//Generate the original position

		this.originalPosition = this.position = 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));

		//Set a containment if given in the options

		if(o.containment)

			this._setContainment();

		//Trigger event + callbacks

		if(this._trigger("start", event) === false) {

			this._clear();

			return false;

		}

		//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) {

			var ui = this._uiHash();

			if(this._trigger('drag', event, ui) === false) {

				this._mouseUp({});

				return false;

			}

			this.position = ui.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)

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

		//if a drop comes from outside (a sortable)

		if(this.dropped) {

			dropped = this.dropped;

			this.dropped = false;

		}

		//if the original element is removed, don't bother to continue

		if(!this.element[0] || !this.element[0].parentNode)

			return false;

		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() {

				if(self._trigger("stop", event) !== false) {

					self._clear();

				}

			});

		} else {

			if(this._trigger("stop", event) !== false) {

				this._clear();

			}

		}

		return false;

	},

	cancel: function() {

		if(this.helper.is(".ui-draggable-dragging")) {

			this._mouseUp({});

		} else {

			this._clear();

		}

		return this;

	},

	_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 (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.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.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) && o.containment.constructor != Array) {

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

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

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