/*
 * jQuery UI Selectable @VERSION
 *
 * Copyright 2010, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Selectables
 *
 * Depends:
 *	jquery.ui.core.js
 *	jquery.ui.mouse.js
 *	jquery.ui.widget.js
 */
(function( $, undefined ) {

$.widget("ui.selectable", $.ui.mouse, {
	options: {
		appendTo: 'body',
		autoRefresh: true,
		distance: 0,
		filter: '*',
		tolerance: 'touch'
	},
	_create: 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.outerWidth(),
					bottom: pos.top + $this.outerHeight(),
					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 = $("<div class='ui-selectable-helper'></div>");
	},

	destroy: function() {
		this.selectees
			.removeClass("ui-selectee")
			.removeData("selectable-item");
		this.element
			.removeClass("ui-selectable ui-selectable-disabled")
			.removeData("selectable")
			.unbind(".selectable");
		this._mouseDestroy();

		return this;
	},

	_mouseStart: function(event) {
		var self = this;

		this.opos = [event.pageX, event.pageY];

		if (this.options.disabled)
			return;

		var options = this.options;

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

		this._trigger("start", event);

		$(options.appendTo).append(this.helper);
		// position helper (lasso)
		this.helper.css({
			"left": event.clientX,
			"top": event.clientY,
			"width": 0,
			"height": 0
		});

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

		this.selectees.filter('.ui-selected').each(function() {
			var selectee = $.data(this, "selectable-item");
			selectee.startselected = true;
			if (!event.metaKey) {
				selectee.$element.removeClass('ui-selected');
				selectee.selected = false;
				selectee.$element.addClass('ui-unselecting');
				selectee.unselecting = true;
				// selectable UNSELECTING callback
				self._trigger("unselecting", event, {
					unselecting: selectee.element
				});
			}
		});

		$(event.target).parents().andSelf().each(function() {
			var selectee = $.data(this, "selectable-item");
			if (selectee) {
				var doSelect = !event.metaKey || !selectee.$element.hasClass('ui-selected');
				selectee.$element
					.removeClass(doSelect ? "ui-unselecting" : "ui-selected")
					.addClass(doSelect ? "ui-selecting" : "ui-unselecting");
				selectee.unselecting = !doSelect;
				selectee.selecting = doSelect;
				selectee.selected = doSelect;
				// selectable (UN)SELECTING callback
				if (doSelect) {
					self._trigger("selecting", event, {
						selecting: selectee.element
					});
				} else {
					self._trigger("unselecting", event, {
						unselecting: selectee.element
					});
				}
				return false;
			}
		});

	},

	_mouseDrag: function(event) {
		var self = this;
		this.dragged = true;

		if (this.options.disabled)
			return;

		var options = this.options;

		var x1 = this.opos[0], y1 = this.opos[1], x2 = event.pageX, y2 = event.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.$element.addClass('ui-selecting');
					selectee.selecting = true;
					// selectable SELECTING callback
					self._trigger("selecting", event, {
						selecting: selectee.element
					});
				}
			} else {
				// UNSELECT
				if (selectee.selecting) {
					if (event.metaKey && selectee.startselected) {
						selectee.$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.$element.addClass('ui-unselecting');
							selectee.unselecting = true;
						}
						// selectable UNSELECTING callback
						self._trigger("unselecting", event, {
							unselecting: selectee.element
						});
					}
				}
				if (selectee.selected) {
					if (!event.metaKey && !selectee.startselected) {
						selectee.$element.removeClass('ui-selected');
						selectee.selected = false;

						selectee.$element.addClass('ui-unselecting');
						selectee.unselecting = true;
						// selectable UNSELECTING callback
						self._trigger("unselecting", event, {
							unselecting: selectee.element
						});
					}
				}
			}
		});

		return false;
	},

	_mouseStop: function(event) {
		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._trigger("unselected", event, {
				unselected: selectee.element
			});
		});
		$('.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._trigger("selected", event, {
				selected: selectee.element
			});
		});
		this._trigger("stop", event);

		this.helper.remove();

		return false;
	}

});

$.extend($.ui.selectable, {
	version: "@VERSION"
});

})(jQuery);
