/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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):
 *   Johnny Stenback <jst@netscape.com> (original author)
 *   Brian Ryner <bryner@brianryner.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of 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 MPL, 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 MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface nsIDocShell;
interface nsIURI;
interface nsIChromeFrameMessageManager;

[scriptable, uuid(3b256c12-20e1-4fd3-8edb-b9c793919f15)]
interface nsIFrameLoader : nsISupports
{
  /**
   * Get the docshell from the frame loader.
   */
  readonly attribute nsIDocShell docShell;

  /**
   * Start loading the frame. This method figures out what to load
   * from the owner content in the frame loader.
   */
  void loadFrame();

  /**
   * Loads the specified URI in this frame. Behaves identically to loadFrame,
   * except that this method allows specifying the URI to load.
   */
  void loadURI(in nsIURI aURI);

  /**
   * Destroy the frame loader and everything inside it. This will
   * clear the weak owner content reference.
   */
  void destroy();

  /**
   * Find out whether the loader's frame is at too great a depth in
   * the frame tree.  This can be used to decide what operations may
   * or may not be allowed on the loader's docshell.
   */
  readonly attribute boolean depthTooGreat;

  // Note, when frameloaders are swapped, also messageManagers are swapped.
  readonly attribute nsIChromeFrameMessageManager messageManager;
};

native alreadyAddRefed_nsFrameLoader(already_AddRefed<nsFrameLoader>);

[scriptable, uuid(8f3b12a0-35ae-4e0d-9152-8e0d7e49d446)]
interface nsIFrameLoaderOwner : nsISupports
{
  /**
   * The frame loader owned by this nsIFrameLoaderOwner
   */
  readonly attribute nsIFrameLoader frameLoader;
  [noscript, notxpcom] alreadyAddRefed_nsFrameLoader GetFrameLoader();

  /**
   * Swap frame loaders with the given nsIFrameLoaderOwner.  This may
   * only be posible in a very limited range of circumstances, or
   * never, depending on the object implementing this interface.
   *
   * @throws NS_ERROR_NOT_IMPLEMENTED if the swapping logic is not
   *   implemented for the two given frame loader owners.
   * @throws NS_ERROR_DOM_SECURITY_ERR if the swap is not allowed on
   *   security grounds.
   */
  void swapFrameLoaders(in nsIFrameLoaderOwner aOtherOwner);
};