(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.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 = $(document.createElement('div'))
            .css({border:'1px dotted black'})
            .addClass("ui-selectable-helper");
        },
        destroy: function() {
            this.element
            .removeClass("ui-selectable ui-selectable-disabled")
            .removeData("selectable")
            .unbind(".selectable");
            this._mouseDestroy();
        },
        _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({
                "z-index": 100,
                "position": "absolute",
                "left": event.clientX,
                "top": event.clientY,
                "width": 0,
                "height": 0
            });
            if (options.autoRefresh) {
                this.refresh();
            }
            this.selectees.filter('.ui-selected').each(function() {
                var selectee = $.data(this, "selectable-item");
                selectee.startselected = true;
                if (!options.invert && !event.metaKey) {
                    selectee.$element.removeClass('ui-selected');
                    selectee.selected = false;
                    selectee.$element.addClass('ui-unselecting');
                    selectee.unselecting = true;
                    // selectable UNSELECTING callback
                    self._trigger("unselecting", event, {
                        unselecting: selectee.element
                    });
                }
            });
            this.removeSelected = options.invert?$(event.target).hasClass('ui-selected'):false;
            $(event.target).parents().andSelf().each(function() {
                var selectee = $.data(this, "selectable-item");
                if (selectee) {
                    selectee.$element.removeClass("ui-unselecting").addClass('ui-selecting');
                    selectee.unselecting = false;
                    selectee.selecting = true;
                    selectee.selected = true;
                    // selectable SELECTING callback
                    self._trigger("selecting", event, {
                        selecting: 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;
                        selectee.unselecting = 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 ||options.invert) && 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
                });
            });
            remove = this.removeSelected;
            $('.ui-selecting', this.element[0]).each(function() {
                if (remove) {
                    var selectee = $.data(this, "selectable-item");
                    selectee.$element.removeClass('ui-selecting').removeClass('ui-selected');
                    selectee.selecting = false;
                    selectee.selected = false;
                    selectee.startselected = false;
                    self._trigger("unselected", event, {
                        unselected: selectee.element
                    });
                    } else {
                    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: "1.7.1",
        defaults: {
            appendTo: 'body',
            autoRefresh: true,
            cancel: ":input,option",
            delay: 0,
            distance: 0,
            invert: false,
            filter: '*',
            tolerance: 'touch'
        }
    });
})(jQuery);