/* -*- 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.
 *
 * The Initial Developer of the Original Code is
 * IBM Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Brian Ryner <bryner@brianryner.com>
 *
 * 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 ***** */

/* interface for managing user and user-agent style sheets */

#include "nsISupports.idl"

interface nsIURI;

/*
 * nsIStyleSheetService allows extensions or embeddors to add to the
 * built-in list of user or agent style sheets.
 */

[scriptable, uuid(1f42a6a2-ab0a-45d4-8a96-396f58ea6c6d)]
interface nsIStyleSheetService : nsISupports
{
  const unsigned long AGENT_SHEET = 0;
  const unsigned long USER_SHEET = 1;

  /**
   * Synchronously loads a style sheet from |sheetURI| and adds it to the list
   * of user or agent style sheets.
   *
   * A user sheet loaded via this API will come before userContent.css and
   * userChrome.css in the cascade (so the rules in it will have lower
   * precedence than rules in those sheets).
   *
   * An agent sheet loaded via this API will come after ua.css in the cascade
   * (so the rules in it will have higher precedence than rules in ua.css).
   *
   * The relative ordering of two user or two agent sheets loaded via
   * this API is undefined.
   *
   * Sheets added via this API take effect on all documents, including
   * already-loaded ones, immediately.
   */
  void loadAndRegisterSheet(in nsIURI sheetURI, in unsigned long type);

  /**
   * Returns true if a style sheet at |sheetURI| has previously been
   * added to the list of style sheets specified by |type|.
   */
  boolean sheetRegistered(in nsIURI sheetURI, in unsigned long type);

  /**
   * Remove the style sheet at |sheetURI| from the list of style sheets
   * specified by |type|.  The removal takes effect immediately, even for
   * already-loaded documents.
   */
  void unregisterSheet(in nsIURI sheetURI, in unsigned long type);
};