gecko-dev/layout/style/nsDOMCSSAttrDeclaration.cpp
2012-05-21 12:12:37 +01:00

169 lines
5.3 KiB
C++

/* -*- Mode: C++; 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/. */
/* DOM object for element.style */
#include "nsDOMCSSAttrDeclaration.h"
#include "mozilla/css/Declaration.h"
#include "mozilla/css/Loader.h"
#include "mozilla/css/StyleRule.h"
#include "mozilla/dom/Element.h"
#include "nsIDocument.h"
#include "nsIDOMMutationEvent.h"
#include "nsIPrincipal.h"
#include "nsIURI.h"
#include "nsNodeUtils.h"
#include "nsGenericElement.h"
namespace css = mozilla::css;
namespace dom = mozilla::dom;
nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(dom::Element* aElement,
bool aIsSMILOverride)
: mElement(aElement)
, mIsSMILOverride(aIsSMILOverride)
{
MOZ_COUNT_CTOR(nsDOMCSSAttributeDeclaration);
NS_ASSERTION(aElement, "Inline style for a NULL element?");
}
nsDOMCSSAttributeDeclaration::~nsDOMCSSAttributeDeclaration()
{
MOZ_COUNT_DTOR(nsDOMCSSAttributeDeclaration);
}
// If nsDOMCSSAttributeDeclaration is changed so that any additional
// fields are traversed by the cycle collector (for instance, if
// wrapper cache handling is changed) then CAN_SKIP must be updated.
NS_IMPL_CYCLE_COLLECTION_1(nsDOMCSSAttributeDeclaration, mElement)
// nsDOMCSSAttributeDeclaration has only one cycle collected field, so
// if mElement is going to be skipped, the attribute declaration can't
// be part of a garbage cycle.
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsDOMCSSAttributeDeclaration)
return !tmp->mElement || nsGenericElement::CanSkip(tmp->mElement, true);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsDOMCSSAttributeDeclaration)
return !tmp->mElement || nsGenericElement::CanSkipInCC(tmp->mElement);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
// CanSkipThis returns false to avoid problems with incomplete unlinking.
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsDOMCSSAttributeDeclaration)
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
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!");
css::StyleRule* oldRule =
mIsSMILOverride ? mElement->GetSMILOverrideStyleRule() :
mElement->GetInlineStyleRule();
NS_ASSERTION(oldRule, "Element must have rule");
nsRefPtr<css::StyleRule> newRule =
oldRule->DeclarationChanged(aDecl, false);
if (!newRule) {
return NS_ERROR_OUT_OF_MEMORY;
}
return
mIsSMILOverride ? mElement->SetSMILOverrideStyleRule(newRule, true) :
mElement->SetInlineStyleRule(newRule, nsnull, 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.
if (!mIsSMILOverride) {
nsNodeUtils::AttributeWillChange(mElement, kNameSpaceID_None,
nsGkAtoms::style,
nsIDOMMutationEvent::MODIFICATION);
}
// We need OwnerDoc() rather than GetCurrentDoc() because it might
// be the BeginUpdate call that inserts mElement into the document.
return mElement->OwnerDoc();
}
css::Declaration*
nsDOMCSSAttributeDeclaration::GetCSSDeclaration(bool aAllocate)
{
if (!mElement)
return nsnull;
css::StyleRule* cssRule;
if (mIsSMILOverride)
cssRule = mElement->GetSMILOverrideStyleRule();
else
cssRule = mElement->GetInlineStyleRule();
if (cssRule) {
return cssRule->GetDeclaration();
}
if (!aAllocate) {
return nsnull;
}
// cannot fail
css::Declaration *decl = new css::Declaration();
decl->InitializeEmpty();
nsRefPtr<css::StyleRule> newRule = new css::StyleRule(nsnull, decl);
// this *can* fail (inside SetAttrAndNotify, at least).
nsresult rv;
if (mIsSMILOverride)
rv = mElement->SetSMILOverrideStyleRule(newRule, false);
else
rv = mElement->SetInlineStyleRule(newRule, nsnull, false);
if (NS_FAILED(rv)) {
return nsnull; // the decl will be destroyed along with the style rule
}
return decl;
}
void
nsDOMCSSAttributeDeclaration::GetCSSParsingEnvironment(CSSParsingEnvironment& aCSSParseEnv)
{
NS_ASSERTION(mElement, "Something is severely broken -- there should be an Element here!");
nsIDocument* doc = mElement->OwnerDoc();
aCSSParseEnv.mSheetURI = doc->GetDocumentURI();
aCSSParseEnv.mBaseURI = mElement->GetBaseURI();
aCSSParseEnv.mPrincipal = mElement->NodePrincipal();
aCSSParseEnv.mCSSLoader = doc->CSSLoader();
}
NS_IMETHODIMP
nsDOMCSSAttributeDeclaration::GetParentRule(nsIDOMCSSRule **aParent)
{
NS_ENSURE_ARG_POINTER(aParent);
*aParent = nsnull;
return NS_OK;
}
/* virtual */ nsINode*
nsDOMCSSAttributeDeclaration::GetParentObject()
{
return mElement;
}