/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */

#include "nsISupports.idl"
#include "nsIRDFCompositeDataSource.idl"
#include "nsIRDFResource.idl"

%{C++
class nsRDFSortState;
%}

[ptr] native nsRDFSortState(nsRDFSortState);

interface nsIContent;
interface nsIDOMNode;

/**
 * A service used to sort the contents of a XUL widget.
 */
[scriptable, uuid(BFD05261-834C-11d2-8EAC-00805F29F371)]
interface nsIXULSortService : nsISupports
{
    /**
     *
     * Sort the contents of the widget containing <code>aNode</code>
     * using <code>aSortResource</code> as the comparison key, and
     * <code>aSortDirection</code> as the direction.
     *
     * @param aNode A node in the XUL widget whose children are to be
     * sorted. <code>Sort</code> will traverse upwards to find the
     * root node at which to begin the actualy sorting. For optimal
     * results, pass in the root of the widget.
     *
     * @param aSortResource The RDF resource to be used as
     * the comparison key.
     *
     * @param aSortDirection May be either <b>natural</b> to return
     * the contents to their natural (unsorted) order,
     * <b>ascending</b> to sort the contents in ascending order, or
     * <b>descending</b> to sort the contents in descending order.
     */
    void Sort(in nsIDOMNode aNode,
              in string aSortResource,
              in string aSortDirection);

    /**
     * Used internally for insertion sorting.
     */
    [noscript] void InsertContainerNode(in nsIRDFCompositeDataSource db,
                                        in nsRDFSortState sortStatePtr,
                                        in nsIContent root,
                                        in nsIContent trueParent,
                                        in nsIContent container,
                                        in nsIContent node,
                                        in boolean aNotify);
};

%{C++
extern nsresult
NS_NewXULSortService(nsIXULSortService **result);
%}