/*

 * jQuery UI Droppable 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/Droppables

 *

 * Depends:

 *	jquery.ui.core.js

 *	jquery.ui.widget.js

 *	jquery.ui.mouse.js

 *	jquery.ui.draggable.js

 */

(function($) {

$.widget("ui.droppable", {

	widgetEventPrefix: "drop",

	options: {

		accept: '*',

		activeClass: false,

		addClasses: true,

		greedy: false,

		hoverClass: false,

		scope: 'default',

		tolerance: 'intersect'

	},

	_create: function() {

		var o = this.options, accept = o.accept;

		this.isover = 0; this.isout = 1;

		this.accept = $.isFunction(accept) ? accept : function(d) {

			return d.is(accept);

		};

		//Store the droppable's proportions

		this.proportions = { width: this.element[0].offsetWidth, height: this.element[0].offsetHeight };

		// Add the reference and positions to the manager

		$.ui.ddmanager.droppables[o.scope] = $.ui.ddmanager.droppables[o.scope] || [];

		$.ui.ddmanager.droppables[o.scope].push(this);

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

	},

	destroy: function() {

		var drop = $.ui.ddmanager.droppables[this.options.scope];

		for ( var i = 0; i < drop.length; i++ )

			if ( drop[i] == this )

				drop.splice(i, 1);

		this.element

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

			.removeData("droppable")

			.unbind(".droppable");

		return this;

	},

	_setOption: function(key, value) {

		if(key == 'accept') {

			this.accept = $.isFunction(value) ? value : function(d) {

				return d.is(value);

			};

		}

		$.Widget.prototype._setOption.apply(this, arguments);

	},

	_activate: function(event) {

		var draggable = $.ui.ddmanager.current;

		if(this.options.activeClass) this.element.addClass(this.options.activeClass);

		(draggable && this._trigger('activate', event, this.ui(draggable)));

	},

	_deactivate: function(event) {

		var draggable = $.ui.ddmanager.current;

		if(this.options.activeClass) this.element.removeClass(this.options.activeClass);

		(draggable && this._trigger('deactivate', event, this.ui(draggable)));

	},

	_over: function(event) {

		var draggable = $.ui.ddmanager.current;

		if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return; // Bail if draggable and droppable are same element

		if (this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {

			if(this.options.hoverClass) this.element.addClass(this.options.hoverClass);

			this._trigger('over', event, this.ui(draggable));

		}

	},

	_out: function(event) {

		var draggable = $.ui.ddmanager.current;

		if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return; // Bail if draggable and droppable are same element

		if (this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {

			if(this.options.hoverClass) this.element.removeClass(this.options.hoverClass);

			this._trigger('out', event, this.ui(draggable));

		}

	},

	_drop: function(event,custom) {

		var draggable = custom || $.ui.ddmanager.current;

		if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return false; // Bail if draggable and droppable are same element

		var childrenIntersection = false;

		this.element.find(":data(droppable)").not(".ui-draggable-dragging").each(function() {

			var inst = $.data(this, 'droppable');

			if(

				inst.options.greedy

				&& !inst.options.disabled

				&& inst.options.scope == draggable.options.scope

				&& inst.accept.call(inst.element[0], (draggable.currentItem || draggable.element))

				&& $.ui.intersect(draggable, $.extend(inst, { offset: inst.element.offset() }), inst.options.tolerance)

			) { childrenIntersection = true; return false; }

		});

		if(childrenIntersection) return false;

		if(this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {

			if(this.options.activeClass) this.element.removeClass(this.options.activeClass);

			if(this.options.hoverClass) this.element.removeClass(this.options.hoverClass);

			this._trigger('drop', event, this.ui(draggable));

			return this.element;

		}

		return false;

	},

	ui: function(c) {

		return {

			draggable: (c.currentItem || c.element),

			helper: c.helper,

			position: c.position,

			offset: c.positionAbs

		};

	}

});

$.extend($.ui.droppable, {

	version: "1.8.1"

});

$.ui.intersect = function(draggable, droppable, toleranceMode) {

	if (!droppable.offset) return false;

	var x1 = (draggable.positionAbs || draggable.position.absolute).left, x2 = x1 + draggable.helperProportions.width,

		y1 = (draggable.positionAbs || draggable.position.absolute).top, y2 = y1 + draggable.helperProportions.height;

	var l = droppable.offset.left, r = l + droppable.proportions.width,

		t = droppable.offset.top, b = t + droppable.proportions.height;

	switch (toleranceMode) {

		case 'fit':

			return (l < x1 && x2 < r

				&& t < y1 && y2 < b);

			break;

		case 'intersect':

			return (l < x1 + (draggable.helperProportions.width / 2) // Right Half

				&& x2 - (draggable.helperProportions.width / 2) < r // Left Half

				&& t < y1 + (draggable.helperProportions.height / 2) // Bottom Half

				&& y2 - (draggable.helperProportions.height / 2) < b ); // Top Half

			break;

		case 'pointer':

			var draggableLeft = ((draggable.positionAbs || draggable.position.absolute).left + (draggable.clickOffset || draggable.offset.click).left),

				draggableTop = ((draggable.positionAbs || draggable.position.absolute).top + (draggable.clickOffset || draggable.offset.click).top),

				isOver = $.ui.isOver(draggableTop, draggableLeft, t, l, droppable.proportions.height, droppable.proportions.width);

			return isOver;

			break;

		case 'touch':

			return (

					(y1 >= t && y1 <= b) ||	// Top edge touching

					(y2 >= t && y2 <= b) ||	// Bottom edge touching

					(y1 < t && y2 > b)		// Surrounded vertically

				) && (

					(x1 >= l && x1 <= r) ||	// Left edge touching

					(x2 >= l && x2 <= r) ||	// Right edge touching

					(x1 < l && x2 > r)		// Surrounded horizontally

				);

			break;

		default:

			return false;

			break;

		}

};

/*

	This manager tracks offsets of draggables and droppables

*/

$.ui.ddmanager = {

	current: null,

	droppables: { 'default': [] },

	prepareOffsets: function(t, event) {

		var m = $.ui.ddmanager.droppables[t.options.scope] || [];

		var type = event ? event.type : null; // workaround for #2317

		var list = (t.currentItem || t.element).find(":data(droppable)").andSelf();

		droppablesLoop: for (var i = 0; i < m.length; i++) {

			if(m[i].options.disabled || (t && !m[i].accept.call(m[i].element[0],(t.currentItem || t.element)))) continue;	//No disabled and non-accepted

			for (var j=0; j < list.length; j++) { if(list[j] == m[i].element[0]) { m[i].proportions.height = 0; continue droppablesLoop; } }; //Filter out elements in the current dragged item

			m[i].visible = m[i].element.css("display") != "none"; if(!m[i].visible) continue; 									//If the element is not visible, continue

			m[i].offset = m[i].element.offset();

			m[i].proportions = { width: m[i].element[0].offsetWidth, height: m[i].element[0].offsetHeight };

			if(type == "mousedown") m[i]._activate.call(m[i], event); //Activate the droppable if used directly from draggables

		}

	},

	drop: function(draggable, event) {

		var dropped = false;

		$.each($.ui.ddmanager.droppables[draggable.options.scope] || [], function() {

			if(!this.options) return;

			if (!this.options.disabled && this.visible && $.ui.intersect(draggable, this, this.options.tolerance))

				dropped = dropped || this._drop.call(this, event);

			if (!this.options.disabled && this.visible && this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {

				this.isout = 1; this.isover = 0;

				this._deactivate.call(this, event);

			}

		});

		return dropped;

	},

	drag: function(draggable, event) {

		//If you have a highly dynamic page, you might try this option. It renders positions every time you move the mouse.

		if(draggable.options.refreshPositions) $.ui.ddmanager.prepareOffsets(draggable, event);

		//Run through all droppables and check their positions based on specific tolerance options

		$.each($.ui.ddmanager.droppables[draggable.options.scope] || [], function() {

			if(this.options.disabled || this.greedyChild || !this.visible) return;

			var intersects = $.ui.intersect(draggable, this, this.options.tolerance);

			var c = !intersects && this.isover == 1 ? 'isout' : (intersects && this.isover == 0 ? 'isover' : null);

			if(!c) return;

			var parentInstance;

			if (this.options.greedy) {

				var parent = this.element.parents(':data(droppable):eq(0)');

				if (parent.length) {

					parentInstance = $.data(parent[0], 'droppable');

					parentInstance.greedyChild = (c == 'isover' ? 1 : 0);

				}

			}

			// we just moved into a greedy child

			if (parentInstance && c == 'isover') {

				parentInstance['isover'] = 0;

				parentInstance['isout'] = 1;

				parentInstance._out.call(parentInstance, event);

			}

			this[c] = 1; this[c == 'isout' ? 'isover' : 'isout'] = 0;

			this[c == "isover" ? "_over" : "_out"].call(this, event);

			// we just moved out of a greedy child

			if (parentInstance && c == 'isout') {

				parentInstance['isout'] = 0;

				parentInstance['isover'] = 1;

				parentInstance._over.call(parentInstance, event);

			}

		});

	}

};

})(jQuery);