/*
 * jQuery UI Selectable
 *
 * Copyright (c) 2008 Richard D. Worth (rdworth.org)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * http://docs.jquery.com/UI/Selectables
 *
 * Depends:
 *	ui.core.js
 *
 * Revision: $Id: ui.selectable.js 5581 2008-05-13 16:58:03Z scott.gonzalez $
 */
;(function($) {

	$.widget("ui.selectable", $.extend($.ui.mouse, {
		init: function() {
			var self = this;
			
			this.element.addClass("ui-selectable");
			
			this.dragged = false;
	
			// cache selectee children based on filter
			var selectees;
			this.refresh = function() {
				selectees = $(self.options.filter, self.element[0]);
				selectees.each(function() {
					var $this = $(this);
					var pos = $this.offset();
					$.data(this, "selectable-item", {
						element: this,
						$element: $this,
						left: pos.left,
						top: pos.top,
						right: pos.left + $this.width(),
						bottom: pos.top + $this.height(),
						startselected: false,
						selected: $this.hasClass('ui-selected'),
						selecting: $this.hasClass('ui-selecting'),
						unselecting: $this.hasClass('ui-unselecting')
					});
				});
			};
			this.refresh();
	
			this.selectees = selectees.addClass("ui-selectee");
			
			this.mouseInit();
			
			this.helper = $(document.createElement('div')).css({border:'1px dotted black'});
		},
		toggle: function() {
			if(this.disabled){
				this.enable();
			} else {
				this.disable();
			}
		},
		destroy: function() {
			this.element
				.removeClass("ui-selectable ui-selectable-disabled")
				.removeData("selectable")
				.unbind(".selectable");
			this.mouseDestroy();
		},
		enable: function() {
			this.element.removeClass("ui-selectable-disabled");
			this.disabled = false;
		},
		disable: function() {
			this.element.addClass("ui-selectable-disabled");
			this.disabled = true;
		},
		mouseStart: function(e) {
			var self = this;
			
			this.opos = [e.pageX, e.pageY];
			
			if (this.disabled)
				return;

			var options = this.options;

			this.selectees = $(options.filter, this.element[0]);

			// selectable START callback
			this.element.triggerHandler("selectablestart", [e, {
				"selectable": this.element[0],
				"options": options
			}], options.start);

			$('body').append(this.helper);
			// position helper (lasso)
			this.helper.css({
				"z-index": 100,
				"position": "absolute",
				"left": e.clientX,
				"top": e.clientY,
				"width": 0,
				"height": 0
			});

			if (options.autoRefresh) {
				this.refresh();
			}

			this.selectees.filter('.ui-selected').each(function() {
				var selectee = $.data(this, "selectable-item");
				selectee.startselected = true;
				if (!e.ctrlKey) {
					selectee.$element.removeClass('ui-selected');
					selectee.selected = false;
					selectee.$element.addClass('ui-unselecting');
					selectee.unselecting = true;
					// selectable UNSELECTING callback
					self.element.triggerHandler("selectableunselecting", [e, {
						selectable: self.element[0],
						unselecting: selectee.element,
						options: options
					}], options.unselecting);
				}
			});
			
			var isSelectee = false;
			$(e.target).parents().andSelf().each(function() {
				if($.data(this, "selectable-item")) isSelectee = true;
			});
			return this.options.keyboard ? !isSelectee : true;
		},
		mouseDrag: function(e) {
			var self = this;
			this.dragged = true;
			
			if (this.disabled)
				return;

			var options = this.options;

			var x1 = this.opos[0], y1 = this.opos[1], x2 = e.pageX, y2 = e.pageY;
			if (x1 > x2) { var tmp = x2; x2 = x1; x1 = tmp; }
			if (y1 > y2) { var tmp = y2; y2 = y1; y1 = tmp; }
			this.helper.css({left: x1, top: y1, width: x2-x1, height: y2-y1});

			this.selectees.each(function() {
				var selectee = $.data(this, "selectable-item");
				//prevent helper from being selected if appendTo: selectable
				if (!selectee || selectee.element == self.element[0])
					return;
				var hit = false;
				if (options.tolerance == 'touch') {
					hit = ( !(selectee.left > x2 || selectee.right < x1 || selectee.top > y2 || selectee.bottom < y1) );
				} else if (options.tolerance == 'fit') {
					hit = (selectee.left > x1 && selectee.right < x2 && selectee.top > y1 && selectee.bottom < y2);
				}

				if (hit) {
					// SELECT
					if (selectee.selected) {
						selectee.$element.removeClass('ui-selected');
						selectee.selected = false;
					}
					if (selectee.unselecting) {
						selectee.$element.removeClass('ui-unselecting');
						selectee.unselecting = false;
					}
					if (!selectee.selecting) {
						selectee.$element.addClass('ui-selecting');
						selectee.selecting = true;
						// selectable SELECTING callback
						self.element.triggerHandler("selectableselecting", [e, {
							selectable: self.element[0],
							selecting: selectee.element,
							options: options
						}], options.selecting);
					}
				} else {
					// UNSELECT
					if (selectee.selecting) {
						if (e.ctrlKey && selectee.startselected) {
							selectee.$element.removeClass('ui-selecting');
							selectee.selecting = false;
							selectee.$element.addClass('ui-selected');
							selectee.selected = true;
						} else {
							selectee.$element.removeClass('ui-selecting');
							selectee.selecting = false;
							if (selectee.startselected) {
								selectee.$element.addClass('ui-unselecting');
								selectee.unselecting = true;
							}
							// selectable UNSELECTING callback
							self.element.triggerHandler("selectableunselecting", [e, {
								selectable: self.element[0],
								unselecting: selectee.element,
								options: options
							}], options.unselecting);
						}
					}
					if (selectee.selected) {
						if (!e.ctrlKey && !selectee.startselected) {
							selectee.$element.removeClass('ui-selected');
							selectee.selected = false;

							selectee.$element.addClass('ui-unselecting');
							selectee.unselecting = true;
							// selectable UNSELECTING callback
							self.element.triggerHandler("selectableunselecting", [e, {
								selectable: self.element[0],
								unselecting: selectee.element,
								options: options
							}], options.unselecting);
						}
					}
				}
			});
			
			return false;
		},
		mouseStop: function(e) {
			var self = this;
			
			this.dragged = false;
			
			var options = this.options;

			$('.ui-unselecting', this.element[0]).each(function() {
				var selectee = $.data(this, "selectable-item");
				selectee.$element.removeClass('ui-unselecting');
				selectee.unselecting = false;
				selectee.startselected = false;
				self.element.triggerHandler("selectableunselected", [e, {
					selectable: self.element[0],
					unselected: selectee.element,
					options: options
				}], options.unselected);
			});
			$('.ui-selecting', this.element[0]).each(function() {
				var selectee = $.data(this, "selectable-item");
				selectee.$element.removeClass('ui-selecting').addClass('ui-selected');
				selectee.selecting = false;
				selectee.selected = true;
				selectee.startselected = true;
				self.element.triggerHandler("selectableselected", [e, {
					selectable: self.element[0],
					selected: selectee.element,
					options: options
				}], options.selected);
			});
			this.element.triggerHandler("selectablestop", [e, {
				selectable: self.element[0],
				options: this.options
			}], this.options.stop);
			
			this.helper.remove();
			
			return false;
		}
	}));
	
	$.extend($.ui.selectable, {
		defaults: {
			distance: 0,
			delay: 0,
			cancel: ":input,button",
			appendTo: 'body',
			autoRefresh: true,
			filter: '*',
			tolerance: 'touch'
		}
	});
	
})(jQuery);