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/* -*- Mode: IDL; 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/. */

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

#include "nsISupports.idl"

interface nsIURI;
interface nsIDOMStyleSheet;

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

[scriptable, uuid(4de68896-e8eb-41de-8237-a797b570ac4a)]
interface nsIStyleSheetService : nsISupports
{
  const unsigned long AGENT_SHEET = 0;
  const unsigned long USER_SHEET = 1;
  const unsigned long AUTHOR_SHEET = 2;

  /**
   * 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);

  /**
   * Synchronously loads a style sheet from |sheetURI| and returns the
   * new style sheet object. Can be used with nsIDOMWindowUtils.addSheet.
   */
  nsIDOMStyleSheet preloadSheet(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);
};