pjs/layout/base/nsStyleSheetService.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * 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,
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 * 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>
 *
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 * 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
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#include "nsStyleSheetService.h"
#include "nsICSSLoader.h"
#include "nsICSSStyleSheet.h"
#include "nsContentCID.h"
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsICategoryManager.h"
#include "nsISupportsPrimitives.h"
#include "nsNetUtil.h"

static NS_DEFINE_CID(kCSSLoaderCID, NS_CSS_LOADER_CID);

nsStyleSheetService *nsStyleSheetService::gInstance = nsnull;

nsStyleSheetService::nsStyleSheetService()
{
  NS_ASSERTION(!gInstance, "Someone is using CreateInstance instead of GetService");
  gInstance = this;
}

nsStyleSheetService::~nsStyleSheetService()
{
  gInstance = nsnull;
}

NS_IMPL_ISUPPORTS1(nsStyleSheetService, nsIStyleSheetService)

void
nsStyleSheetService::RegisterFromEnumerator(nsICategoryManager  *aManager,
                                            const char          *aCategory,
                                            nsISimpleEnumerator *aEnumerator,
                                            PRUint32             aSheetType)
{
  if (!aEnumerator)
    return;

  PRBool hasMore;
  while (NS_SUCCEEDED(aEnumerator->HasMoreElements(&hasMore)) && hasMore) {
    nsCOMPtr<nsISupports> element;
    if (NS_FAILED(aEnumerator->GetNext(getter_AddRefs(element))))
      break;

    nsCOMPtr<nsISupportsCString> icStr = do_QueryInterface(element);
    NS_ASSERTION(icStr,
                 "category manager entries must be nsISupportsCStrings");

    nsCAutoString name;
    icStr->GetData(name);

    nsXPIDLCString spec;
    aManager->GetCategoryEntry(aCategory, name.get(), getter_Copies(spec));

    nsCOMPtr<nsIURI> uri;
    NS_NewURI(getter_AddRefs(uri), spec);
    if (uri)
      LoadAndRegisterSheet(uri, aSheetType);
  }
}

nsresult
nsStyleSheetService::Init()
{
  // Enumerate all of the style sheet URIs registered in the category
  // manager and load them.

  nsCOMPtr<nsICategoryManager> catMan =
    do_GetService(NS_CATEGORYMANAGER_CONTRACTID);

  NS_ENSURE_TRUE(catMan, NS_ERROR_OUT_OF_MEMORY);

  nsCOMPtr<nsISimpleEnumerator> sheets;
  catMan->EnumerateCategory("agent-style-sheets", getter_AddRefs(sheets));
  RegisterFromEnumerator(catMan, "agent-style-sheets", sheets, AGENT_SHEET);

  catMan->EnumerateCategory("user-style-sheets", getter_AddRefs(sheets));
  RegisterFromEnumerator(catMan, "user-style-sheets", sheets, USER_SHEET);

  return NS_OK;
}

NS_IMETHODIMP
nsStyleSheetService::LoadAndRegisterSheet(nsIURI *aSheetURI,
                                          PRUint32 aSheetType)
{
  nsCOMPtr<nsICSSLoader> loader = do_CreateInstance(kCSSLoaderCID);
  nsCOMPtr<nsICSSStyleSheet> sheet;
  nsresult rv = loader->LoadAgentSheet(aSheetURI, getter_AddRefs(sheet));
  NS_ENSURE_SUCCESS(rv, rv);

  switch (aSheetType) {
  case AGENT_SHEET:
    mAgentSheets.AppendObject(sheet);
    break;
  case USER_SHEET:
    mUserSheets.AppendObject(sheet);
    break;
  default:
    NS_ERROR("Unknown sheet type");
  }

  return NS_OK;
}