/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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 Communicator client code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Peter Annema <disttsc@bart.nl>
 *
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the NPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*

  Private interface to XUL content.

*/

#ifndef nsIXULContent_h__
#define nsIXULContent_h__

#include "nsIXMLContent.h"
class nsIAtom;
class nsIRDFCompositeDataSource;
class nsIXULTemplateBuilder;
class nsString;

// {39C5ECC0-5C47-11d3-BE36-00104BDE6048}
#define NS_IXULCONTENT_IID \
{ 0x39c5ecc0, 0x5c47, 0x11d3, { 0xbe, 0x36, 0x0, 0x10, 0x4b, 0xde, 0x60, 0x48 } }


class nsIXULContent : public nsIXMLContent
{
public:
    static const nsIID& GetIID() { static nsIID iid = NS_IXULCONTENT_IID; return iid; }

    /**
     * Peek at a XUL element's child count without forcing children to be
     * instantiated.
     */
    NS_IMETHOD PeekChildCount(PRInt32& aCount) const = 0;

    /**
     * These flags are used to maintain bookkeeping information for partially-
     * constructed content.
     *
     *   eChildrenMustBeRebuilt
     *     The element's children are invalid or unconstructed, and should
     *     be reconstructed.
     *
     *   eTemplateContentsBuilt
     *     Child content that is built from a XUL template has been
     *     constructed. 
     *
     *   eContainerContentsBuilt
     *     Child content that is built by following the ``containment''
     *     property in a XUL template has been built.
     */
    enum LazyState {
        eChildrenMustBeRebuilt  = 0x1,
        eTemplateContentsBuilt  = 0x2,
        eContainerContentsBuilt = 0x4
    };

#define LAZYSTATE_BITS 3

    /**
     * Set one or more ``lazy state'' flags.
     * @aFlags a mask of flags to set
     */
    NS_IMETHOD SetLazyState(LazyState aFlags) = 0;

    /**
     * Clear one or more ``lazy state'' flags.
     * @aFlags a mask of flags to clear
     */
    NS_IMETHOD ClearLazyState(LazyState aFlags) = 0;

    /**
     * Get the value of a single ``lazy state'' flag.
     * @aFlag a flag to test
     * @aResult the result
     */
    NS_IMETHOD GetLazyState(LazyState aFlag, PRBool& aResult) = 0;

    /**
     * Add a script event listener to the element.
     */
    NS_IMETHOD AddScriptEventListener(nsIAtom* aName, const nsAString& aValue) = 0;
};

#endif // nsIXULContent_h__
