/* -*- Mode: C++; 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.org object loading code.
 *
 * The Initial Developer of the Original Code is
 * Christian Biesinger <cbiesinger@web.de>.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * 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 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 nsIObjectFrame;
interface nsIPluginInstance;

/**
 * This interface represents a content node that loads objects.
 */
[scriptable, uuid(90ab443e-3e99-405e-88c9-9c42adaa3217)]
interface nsIObjectLoadingContent : nsISupports
{
  const unsigned long TYPE_LOADING  = 0;
  const unsigned long TYPE_IMAGE    = 1;
  const unsigned long TYPE_PLUGIN   = 2;
  const unsigned long TYPE_DOCUMENT = 3;
  const unsigned long TYPE_NULL     = 4;

  /**
   * The actual mime type (the one we got back from the network
   * request) for the element.
   */
  readonly attribute ACString actualType;

  /**
   * Gets the type of the content that's currently loaded. See
   * the constants above for the list of possible values.
   */
  readonly attribute unsigned long displayedType;

  /**
   * Gets the content type that corresponds to the give MIME type.  See the
   * constants above for the list of possible values.  If nothing else fits,
   * TYPE_NULL will be returned.
   */
  unsigned long getContentTypeForMIMEType(in AUTF8String aMimeType);

  /**
   * Returns the plugin instance if it has already been instantiated. This
   * will never instantiate the plugin and so is safe to call even when
   * content script must not execute.
   */
  [noscript] readonly attribute nsIPluginInstance pluginInstance;


  /**
   * Makes sure that a frame for this object exists, and that the plugin is
   * instantiated. This method does nothing if the type is not #TYPE_PLUGIN.
   * There is no guarantee that there will be a frame after this method is
   * called; for example, the node may have a display:none style. If plugin
   * instantiation is possible, it will be done synchronously by this method,
   * and the plugin instance will be returned. A success return value does not
   * necessarily mean that the instance is nonnull.
   *
   * This is a noscript method because it is internal and will go away once
   * plugin loading moves to content.
   *
   * @note If there is an error instantiating the plugin, this method will
   * trigger fallback to replacement content, and the type will change (and
   * this method will return a failure code)
   */
  [noscript] nsIPluginInstance ensureInstantiation();

  /**
   * Tells the content about an associated object frame.
   * This can be called multiple times for different frames.
   *
   * This is noscript because this is an internal method that will go away, and
   * because nsIObjectFrame is unscriptable.
   */
  [noscript] void hasNewFrame(in nsIObjectFrame aFrame);
};
