зеркало из https://github.com/mozilla/pjs.git
219 строки
7.1 KiB
C++
219 строки
7.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla.
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*
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* The Initial Developer of the Original Code is
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* IBM Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brian Ryner <bryner@brianryner.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* implementation of interface for managing user and user-agent style sheets */
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#include "prlog.h"
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#include "nsStyleSheetService.h"
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#include "nsIStyleSheet.h"
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#include "mozilla/css/Loader.h"
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#include "nsCSSStyleSheet.h"
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#include "nsIURI.h"
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#include "nsContentCID.h"
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#include "nsCOMPtr.h"
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#include "nsIServiceManager.h"
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#include "nsICategoryManager.h"
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#include "nsISupportsPrimitives.h"
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#include "nsNetUtil.h"
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#include "nsIObserverService.h"
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#include "nsLayoutStatics.h"
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nsStyleSheetService *nsStyleSheetService::gInstance = nsnull;
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nsStyleSheetService::nsStyleSheetService()
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{
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PR_STATIC_ASSERT(0 == AGENT_SHEET && 1 == USER_SHEET);
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NS_ASSERTION(!gInstance, "Someone is using CreateInstance instead of GetService");
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gInstance = this;
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nsLayoutStatics::AddRef();
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}
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nsStyleSheetService::~nsStyleSheetService()
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{
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gInstance = nsnull;
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nsLayoutStatics::Release();
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}
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NS_IMPL_ISUPPORTS1(nsStyleSheetService, nsIStyleSheetService)
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void
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nsStyleSheetService::RegisterFromEnumerator(nsICategoryManager *aManager,
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const char *aCategory,
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nsISimpleEnumerator *aEnumerator,
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PRUint32 aSheetType)
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{
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if (!aEnumerator)
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return;
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PRBool hasMore;
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while (NS_SUCCEEDED(aEnumerator->HasMoreElements(&hasMore)) && hasMore) {
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nsCOMPtr<nsISupports> element;
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if (NS_FAILED(aEnumerator->GetNext(getter_AddRefs(element))))
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break;
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nsCOMPtr<nsISupportsCString> icStr = do_QueryInterface(element);
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NS_ASSERTION(icStr,
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"category manager entries must be nsISupportsCStrings");
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nsCAutoString name;
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icStr->GetData(name);
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nsXPIDLCString spec;
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aManager->GetCategoryEntry(aCategory, name.get(), getter_Copies(spec));
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nsCOMPtr<nsIURI> uri;
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NS_NewURI(getter_AddRefs(uri), spec);
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if (uri)
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LoadAndRegisterSheetInternal(uri, aSheetType);
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}
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}
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PRInt32
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nsStyleSheetService::FindSheetByURI(const nsCOMArray<nsIStyleSheet> &sheets,
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nsIURI *sheetURI)
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{
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for (PRInt32 i = sheets.Count() - 1; i >= 0; i-- ) {
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PRBool bEqual;
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nsIURI* uri = sheets[i]->GetSheetURI();
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if (uri
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&& NS_SUCCEEDED(uri->Equals(sheetURI, &bEqual))
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&& bEqual) {
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return i;
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}
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}
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return -1;
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}
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nsresult
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nsStyleSheetService::Init()
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{
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// Enumerate all of the style sheet URIs registered in the category
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// manager and load them.
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nsCOMPtr<nsICategoryManager> catMan =
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do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
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NS_ENSURE_TRUE(catMan, NS_ERROR_OUT_OF_MEMORY);
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nsCOMPtr<nsISimpleEnumerator> sheets;
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catMan->EnumerateCategory("agent-style-sheets", getter_AddRefs(sheets));
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RegisterFromEnumerator(catMan, "agent-style-sheets", sheets, AGENT_SHEET);
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catMan->EnumerateCategory("user-style-sheets", getter_AddRefs(sheets));
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RegisterFromEnumerator(catMan, "user-style-sheets", sheets, USER_SHEET);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStyleSheetService::LoadAndRegisterSheet(nsIURI *aSheetURI,
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PRUint32 aSheetType)
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{
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nsresult rv = LoadAndRegisterSheetInternal(aSheetURI, aSheetType);
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if (NS_SUCCEEDED(rv)) {
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const char* message = (aSheetType == AGENT_SHEET) ?
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"agent-sheet-added" : "user-sheet-added";
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nsCOMPtr<nsIObserverService> serv =
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mozilla::services::GetObserverService();
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if (serv) {
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// We're guaranteed that the new sheet is the last sheet in
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// mSheets[aSheetType]
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const nsCOMArray<nsIStyleSheet> & sheets = mSheets[aSheetType];
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serv->NotifyObservers(sheets[sheets.Count() - 1], message, nsnull);
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}
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}
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return rv;
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}
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nsresult
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nsStyleSheetService::LoadAndRegisterSheetInternal(nsIURI *aSheetURI,
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PRUint32 aSheetType)
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{
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NS_ENSURE_ARG(aSheetType == AGENT_SHEET || aSheetType == USER_SHEET);
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NS_ENSURE_ARG_POINTER(aSheetURI);
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nsRefPtr<mozilla::css::Loader> loader = new mozilla::css::Loader();
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nsRefPtr<nsCSSStyleSheet> sheet;
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// Allow UA sheets, but not user sheets, to use unsafe rules
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nsresult rv = loader->LoadSheetSync(aSheetURI, aSheetType == AGENT_SHEET,
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PR_TRUE, getter_AddRefs(sheet));
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NS_ENSURE_SUCCESS(rv, rv);
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if (!mSheets[aSheetType].AppendObject(sheet)) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsStyleSheetService::SheetRegistered(nsIURI *sheetURI,
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PRUint32 aSheetType, PRBool *_retval)
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{
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NS_ENSURE_ARG(aSheetType == AGENT_SHEET || aSheetType == USER_SHEET);
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NS_ENSURE_ARG_POINTER(sheetURI);
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NS_PRECONDITION(_retval, "Null out param");
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*_retval = (FindSheetByURI(mSheets[aSheetType], sheetURI) >= 0);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStyleSheetService::UnregisterSheet(nsIURI *sheetURI, PRUint32 aSheetType)
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{
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NS_ENSURE_ARG(aSheetType == AGENT_SHEET || aSheetType == USER_SHEET);
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NS_ENSURE_ARG_POINTER(sheetURI);
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PRInt32 foundIndex = FindSheetByURI(mSheets[aSheetType], sheetURI);
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NS_ENSURE_TRUE(foundIndex >= 0, NS_ERROR_INVALID_ARG);
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nsCOMPtr<nsIStyleSheet> sheet = mSheets[aSheetType][foundIndex];
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mSheets[aSheetType].RemoveObjectAt(foundIndex);
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const char* message = (aSheetType == AGENT_SHEET) ?
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"agent-sheet-removed" : "user-sheet-removed";
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nsCOMPtr<nsIObserverService> serv =
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mozilla::services::GetObserverService();
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if (serv)
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serv->NotifyObservers(sheet, message, nsnull);
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return NS_OK;
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}
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