/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIFile;

webidl Element;

[scriptable, uuid(2d1a95e4-5bd8-4eeb-b0a8-c1455fd2a357)]
interface nsIShellService : nsISupports
{
  /**
   * Determines whether or not Firefox is the "Default Browser."
   * This is simply whether or not Firefox is registered to handle
   * http links.
   *
   * @param aForAllTypes  true if the check should be made for HTTP and HTML.
   *                      false if the check should be made for HTTP only.
   *                      This parameter may be ignored on some platforms.
   */
  boolean isDefaultBrowser([optional] in boolean aForAllTypes);

  /**
   * Registers Firefox as the "Default Browser."
   *
   * @param aForAllUsers   Whether or not Firefox should attempt
   *                       to become the default browser for all
   *                       users on a multi-user system.
   */
  void setDefaultBrowser(in boolean aForAllUsers);

  /**
   * Flags for positioning/sizing of the Desktop Background image.
   */
  const long BACKGROUND_TILE      = 1;
  const long BACKGROUND_STRETCH   = 2;
  const long BACKGROUND_CENTER    = 3;
  const long BACKGROUND_FILL      = 4;
  const long BACKGROUND_FIT       = 5;
  const long BACKGROUND_SPAN      = 6;

    /**
     * Sets the desktop background image using either the HTML <IMG>
     * element supplied or the background image of the element supplied.
     *
     * @param aImageElement Either a HTML <IMG> element or an element with
     *                      a background image from which to source the
     *                      background image.
     * @param aPosition     How to place the image on the desktop
     * @param aImageName    The image name. Equivalent to the leaf name of the
     *                      location.href.
     */
  void setDesktopBackground(in Element aElement,
                            in long aPosition,
                            in ACString aImageName);

  /**
   * The desktop background color, visible when no background image is
   * used, or if the background image is centered and does not fill the
   * entire screen. A rgb value, where (r << 16 | g << 8 | b)
   */
  attribute unsigned long desktopBackgroundColor;
};