source: Dev/branches/jQueryUI/client/js/jquery/ui/jquery.ui.selectable.js @ 249

/*
 * jQuery UI Selectable 1.8.17
 *
 * Copyright 2011, 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.addClass("ui-selectee");
                        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 = $.data(this, "selectable-item");
                        selectee.startselected = true;
                        if (!event.metaKey && !event.ctrlKey) {
                                selectee.$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 = $.data(this, "selectable-item");
                        if (selectee) {
                                var doSelect = (!event.metaKey && !event.ctrlKey) || !selectee.$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.$element.addClass('ui-selecting');
                                        selectee.selecting = true;
                                        // selectable SELECTING callback
                                        self._trigger("selecting", event, {
                                                selecting: selectee.element
                                        });
                                }
                        } else {
                                // UNSELECT
                                if (selectee.selecting) {
                                        if ((event.metaKey || event.ctrlKey) && selectee.startselected) {
                                                selectee.$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.$element.addClass('ui-unselecting');
                                                        selectee.unselecting = true;
                                                }
                                                // selectable UNSELECTING callback
                                                self._trigger("unselecting", event, {
                                                        unselecting: selectee.element
                                                });
                                        }
                                }
                                if (selectee.selected) {
                                        if (!event.metaKey && !event.ctrlKey && !selectee.startselected) {
                                                selectee.$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: "1.8.17"
});

})(jQuery);