gecko/layout/style/nsLayoutStylesheetCache.cpp

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/* -*- Mode: C++; tab-width: 8; 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 Gecko Layout
*
* The Initial Developer of the Original Code is
* Benjamin Smedberg <bsmedberg@covad.net>
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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 ***** */
#include "nsLayoutStylesheetCache.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsICSSLoader.h"
#include "nsIFile.h"
#include "nsLayoutCID.h"
#include "nsNetUtil.h"
#include "nsIObserverService.h"
#include "nsServiceManagerUtils.h"
NS_IMPL_ISUPPORTS1(nsLayoutStylesheetCache, nsIObserver)
nsresult
nsLayoutStylesheetCache::Observe(nsISupports* aSubject,
const char* aTopic,
const PRUnichar* aData)
{
if (!strcmp(aTopic, "profile-before-change")) {
mUserContentSheet = nsnull;
mUserChromeSheet = nsnull;
}
else if (!strcmp(aTopic, "profile-do-change")) {
InitFromProfile();
}
else if (strcmp(aTopic, "chrome-flush-skin-caches") == 0 ||
strcmp(aTopic, "chrome-flush-caches") == 0) {
mScrollbarsSheet = nsnull;
mFormsSheet = nsnull;
}
else {
NS_NOTREACHED("Unexpected observer topic.");
}
return NS_OK;
}
nsICSSStyleSheet*
nsLayoutStylesheetCache::ScrollbarsSheet()
{
EnsureGlobal();
if (!gStyleCache)
return nsnull;
if (!gStyleCache->mScrollbarsSheet) {
nsCOMPtr<nsIURI> sheetURI;
NS_NewURI(getter_AddRefs(sheetURI),
#ifdef XP_MACOSX
NS_LITERAL_CSTRING("chrome://global/skin/nativescrollbars.css"));
#else
NS_LITERAL_CSTRING("chrome://global/skin/xulscrollbars.css"));
#endif
// Scrollbars don't need access to unsafe rules
if (sheetURI)
LoadSheet(sheetURI, gStyleCache->mScrollbarsSheet, PR_FALSE);
#ifdef XP_MACOSX
NS_ASSERTION(gStyleCache->mScrollbarsSheet, "Could not load nativescrollbars.css.");
#else
NS_ASSERTION(gStyleCache->mScrollbarsSheet, "Could not load xulscrollbars.css.");
#endif
}
return gStyleCache->mScrollbarsSheet;
}
nsICSSStyleSheet*
nsLayoutStylesheetCache::FormsSheet()
{
EnsureGlobal();
if (!gStyleCache)
return nsnull;
if (!gStyleCache->mFormsSheet) {
nsCOMPtr<nsIURI> sheetURI;
NS_NewURI(getter_AddRefs(sheetURI),
NS_LITERAL_CSTRING("resource://gre/res/forms.css"));
// forms.css needs access to unsafe rules
if (sheetURI)
LoadSheet(sheetURI, gStyleCache->mFormsSheet, PR_TRUE);
NS_ASSERTION(gStyleCache->mFormsSheet, "Could not load forms.css.");
}
return gStyleCache->mFormsSheet;
}
nsICSSStyleSheet*
nsLayoutStylesheetCache::UserContentSheet()
{
EnsureGlobal();
if (!gStyleCache)
return nsnull;
return gStyleCache->mUserContentSheet;
}
nsICSSStyleSheet*
nsLayoutStylesheetCache::UserChromeSheet()
{
EnsureGlobal();
if (!gStyleCache)
return nsnull;
return gStyleCache->mUserChromeSheet;
}
void
nsLayoutStylesheetCache::Shutdown()
{
NS_IF_RELEASE(gCSSLoader);
NS_IF_RELEASE(gStyleCache);
}
nsLayoutStylesheetCache::nsLayoutStylesheetCache()
{
nsCOMPtr<nsIObserverService> obsSvc =
do_GetService("@mozilla.org/observer-service;1");
NS_ASSERTION(obsSvc, "No global observer service?");
if (obsSvc) {
obsSvc->AddObserver(this, "profile-before-change", PR_FALSE);
obsSvc->AddObserver(this, "profile-do-change", PR_FALSE);
obsSvc->AddObserver(this, "chrome-flush-skin-caches", PR_FALSE);
obsSvc->AddObserver(this, "chrome-flush-caches", PR_FALSE);
}
InitFromProfile();
}
nsLayoutStylesheetCache::~nsLayoutStylesheetCache()
{
gCSSLoader = nsnull;
gStyleCache = nsnull;
}
void
nsLayoutStylesheetCache::EnsureGlobal()
{
if (gStyleCache) return;
gStyleCache = new nsLayoutStylesheetCache();
if (!gStyleCache) return;
NS_ADDREF(gStyleCache);
}
void
nsLayoutStylesheetCache::InitFromProfile()
{
nsCOMPtr<nsIFile> contentFile;
nsCOMPtr<nsIFile> chromeFile;
NS_GetSpecialDirectory(NS_APP_USER_CHROME_DIR,
getter_AddRefs(contentFile));
if (!contentFile) {
// if we don't have a profile yet, that's OK!
return;
}
contentFile->Clone(getter_AddRefs(chromeFile));
if (!chromeFile) return;
contentFile->Append(NS_LITERAL_STRING("userContent.css"));
chromeFile->Append(NS_LITERAL_STRING("userChrome.css"));
LoadSheetFile(contentFile, mUserContentSheet);
LoadSheetFile(chromeFile, mUserChromeSheet);
}
void
nsLayoutStylesheetCache::LoadSheetFile(nsIFile* aFile, nsCOMPtr<nsICSSStyleSheet> &aSheet)
{
PRBool exists = PR_FALSE;
aFile->Exists(&exists);
if (!exists) return;
nsCOMPtr<nsIURI> uri;
NS_NewFileURI(getter_AddRefs(uri), aFile);
LoadSheet(uri, aSheet, PR_FALSE);
}
void
nsLayoutStylesheetCache::LoadSheet(nsIURI* aURI, nsCOMPtr<nsICSSStyleSheet> &aSheet,
PRBool aEnableUnsafeRules)
{
if (!aURI) {
NS_ERROR("Null URI. Out of memory?");
return;
}
if (!gCSSLoader)
NS_NewCSSLoader(&gCSSLoader);
if (gCSSLoader) {
gCSSLoader->LoadSheetSync(aURI, aEnableUnsafeRules, getter_AddRefs(aSheet));
}
}
nsLayoutStylesheetCache*
nsLayoutStylesheetCache::gStyleCache = nsnull;
nsICSSLoader*
nsLayoutStylesheetCache::gCSSLoader = nsnull;