gecko/layout/style/nsDOMCSSAttrDeclaration.cpp

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/* -*- Mode: C++; 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 Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Ms2ger <ms2ger@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 ***** */
/* DOM object for element.style */
#include "nsDOMCSSAttrDeclaration.h"
#include "mozilla/css/Declaration.h"
#include "mozilla/css/Loader.h"
#include "mozilla/dom/Element.h"
#include "nsICSSStyleRule.h"
#include "nsIDocument.h"
#include "nsIDOMMutationEvent.h"
#include "nsIPrincipal.h"
#include "nsIURI.h"
#include "nsNodeUtils.h"
namespace css = mozilla::css;
namespace dom = mozilla::dom;
nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(dom::Element* aElement
#ifdef MOZ_SMIL
, PRBool aIsSMILOverride
#endif // MOZ_SMIL
)
: mElement(aElement)
#ifdef MOZ_SMIL
, mIsSMILOverride(aIsSMILOverride)
#endif // MOZ_SMIL
{
MOZ_COUNT_CTOR(nsDOMCSSAttributeDeclaration);
NS_ASSERTION(aElement, "Inline style for a NULL element?");
}
nsDOMCSSAttributeDeclaration::~nsDOMCSSAttributeDeclaration()
{
MOZ_COUNT_DTOR(nsDOMCSSAttributeDeclaration);
}
NS_IMPL_CYCLE_COLLECTION_1(nsDOMCSSAttributeDeclaration, mElement)
NS_INTERFACE_MAP_BEGIN(nsDOMCSSAttributeDeclaration)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(nsDOMCSSAttributeDeclaration)
NS_IMPL_QUERY_TAIL_INHERITING(nsDOMCSSDeclaration)
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMCSSAttributeDeclaration)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMCSSAttributeDeclaration)
nsresult
nsDOMCSSAttributeDeclaration::SetCSSDeclaration(css::Declaration* aDecl)
{
NS_ASSERTION(mElement, "Must have Element to set the declaration!");
nsICSSStyleRule* oldRule =
#ifdef MOZ_SMIL
mIsSMILOverride ? mElement->GetSMILOverrideStyleRule() :
#endif // MOZ_SMIL
mElement->GetInlineStyleRule();
NS_ASSERTION(oldRule, "Element must have rule");
nsCOMPtr<nsICSSStyleRule> newRule =
oldRule->DeclarationChanged(aDecl, PR_FALSE);
if (!newRule) {
return NS_ERROR_OUT_OF_MEMORY;
}
return
#ifdef MOZ_SMIL
mIsSMILOverride ? mElement->SetSMILOverrideStyleRule(newRule, PR_TRUE) :
#endif // MOZ_SMIL
mElement->SetInlineStyleRule(newRule, PR_TRUE);
}
nsIDocument*
nsDOMCSSAttributeDeclaration::DocToUpdate()
{
// XXXbz this is a bit of a hack, especially doing it before the
// BeginUpdate(), but this is a good chokepoint where we know we
// plan to modify the CSSDeclaration, so need to notify
// AttributeWillChange if this is inline style.
#ifdef MOZ_SMIL
if (!mIsSMILOverride)
#endif
{
nsNodeUtils::AttributeWillChange(mElement, kNameSpaceID_None,
nsGkAtoms::style,
nsIDOMMutationEvent::MODIFICATION);
}
// We need GetOwnerDoc() rather than GetCurrentDoc() because it might
// be the BeginUpdate call that inserts mElement into the document.
return mElement->GetOwnerDoc();
}
css::Declaration*
nsDOMCSSAttributeDeclaration::GetCSSDeclaration(PRBool aAllocate)
{
if (!mElement)
return nsnull;
nsICSSStyleRule* cssRule;
#ifdef MOZ_SMIL
if (mIsSMILOverride)
cssRule = mElement->GetSMILOverrideStyleRule();
else
#endif // MOZ_SMIL
cssRule = mElement->GetInlineStyleRule();
if (cssRule) {
return cssRule->GetDeclaration();
}
if (!aAllocate) {
return nsnull;
}
// cannot fail
css::Declaration *decl = new css::Declaration();
decl->InitializeEmpty();
nsCOMPtr<nsICSSStyleRule> newRule = NS_NewCSSStyleRule(nsnull, decl);
// this *can* fail (inside SetAttrAndNotify, at least).
nsresult rv;
#ifdef MOZ_SMIL
if (mIsSMILOverride)
rv = mElement->SetSMILOverrideStyleRule(newRule, PR_FALSE);
else
#endif // MOZ_SMIL
rv = mElement->SetInlineStyleRule(newRule, PR_FALSE);
if (NS_FAILED(rv)) {
return nsnull; // the decl will be destroyed along with the style rule
}
return decl;
}
/*
* This is a utility function. It will only fail if it can't get a
* parser. This means it can return NS_OK without aURI or aCSSLoader
* being initialized.
*/
nsresult
nsDOMCSSAttributeDeclaration::GetCSSParsingEnvironment(nsIURI** aSheetURI,
nsIURI** aBaseURI,
nsIPrincipal** aSheetPrincipal,
mozilla::css::Loader** aCSSLoader)
{
NS_ASSERTION(mElement, "Something is severely broken -- there should be an Element here!");
// null out the out params since some of them may not get initialized below
*aSheetURI = nsnull;
*aBaseURI = nsnull;
*aSheetPrincipal = nsnull;
*aCSSLoader = nsnull;
nsIDocument* doc = mElement->GetOwnerDoc();
if (!doc) {
// document has been destroyed
return NS_ERROR_NOT_AVAILABLE;
}
nsCOMPtr<nsIURI> baseURI = mElement->GetBaseURI();
nsCOMPtr<nsIURI> sheetURI = doc->GetDocumentURI();
NS_ADDREF(*aCSSLoader = doc->CSSLoader());
baseURI.swap(*aBaseURI);
sheetURI.swap(*aSheetURI);
NS_ADDREF(*aSheetPrincipal = mElement->NodePrincipal());
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSAttributeDeclaration::GetParentRule(nsIDOMCSSRule **aParent)
{
NS_ENSURE_ARG_POINTER(aParent);
*aParent = nsnull;
return NS_OK;
}
/* virtual */ nsINode*
nsDOMCSSAttributeDeclaration::GetParentObject()
{
return mElement;
}