/*

 *

 * 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._mouseInit();

	},

	destroy: function() {

		if(!this.element.data('draggable')) return;

		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);

		//Set a containment if given in the options

		if(o.containment)

			this._setContainment();

		//Call plugins and callbacks

		//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(!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)

		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._clear();

			});

		} else {

			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[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,

		];

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

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

			this.containment = [

			];

		}

	},

	_convertPositionTo: function(d, pos) {

		if(!pos) pos = this.position;

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

		return {

			top: (

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

			),

			left: (

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

			)

		};

	},

	_generatePosition: function(event) {

		/*

		 * - Position constraining -

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

		 */

		}

	},

	_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

	},

	plugins: {},

	_uiHash: function(event) {

		return {

			helper: this.helper,

			position: this.position,

		};

	}

}));

$.extend($.ui.draggable, {

	defaults: {

		appendTo: "parent",

		axis: false,

		connectToSortable: false,

		containment: false,

		delay: 0,

		distance: 1,

		grid: false,

		handle: false,

		helper: "original",

		iframeFix: false,

		refreshPositions: false,

		revert: false,

		revertDuration: 500,

		scope: "default",

		scroll: true,

		scrollSensitivity: 20,

		scrollSpeed: 20,

		snap: false,

		snapMode: "both",

		snapTolerance: 20,

		stack: false,

	}

});

$.ui.plugin.add("draggable", "connectToSortable", {

	start: function(event, ui) {

		inst.sortables = [];

		});

	},

	stop: function(event, ui) {

		//If we are still over the sortable, we fake the stop event of the sortable, but also remove helper

		$.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)

				this.instance._mouseStop(event);

					this.instance.currentItem.css({ top: 'auto', left: 'auto' });

			} else {

				this.instance.cancelHelperRemoval = false; //Remove the helper in the sortable instance

			}

		});

	},

	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 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) {