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Mypal/dom/svg/SVGUseElement.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "mozilla/ArrayUtils.h"
#include "mozilla/dom/SVGUseElement.h"
#include "mozilla/dom/SVGUseElementBinding.h"
#include "nsGkAtoms.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "mozilla/dom/Element.h"
#include "nsContentUtils.h"
#include "nsIURI.h"
#include "nsSVGEffects.h"
NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(Use)
namespace mozilla {
namespace dom {
JSObject*
SVGUseElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
{
return SVGUseElementBinding::Wrap(aCx, this, aGivenProto);
}
////////////////////////////////////////////////////////////////////////
// implementation
nsSVGElement::LengthInfo SVGUseElement::sLengthInfo[4] =
{
{ &nsGkAtoms::x, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
{ &nsGkAtoms::y, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
{ &nsGkAtoms::width, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
{ &nsGkAtoms::height, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
};
nsSVGElement::StringInfo SVGUseElement::sStringInfo[2] =
{
{ &nsGkAtoms::href, kNameSpaceID_None, true },
{ &nsGkAtoms::href, kNameSpaceID_XLink, true }
};
//----------------------------------------------------------------------
// nsISupports methods
NS_IMPL_CYCLE_COLLECTION_CLASS(SVGUseElement)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SVGUseElement,
SVGUseElementBase)
nsAutoScriptBlocker scriptBlocker;
NS_IMPL_CYCLE_COLLECTION_UNLINK(mOriginal)
tmp->DestroyAnonymousContent();
tmp->UnlinkSource();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SVGUseElement,
SVGUseElementBase)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOriginal)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mClone)
tmp->mSource.Traverse(&cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_ADDREF_INHERITED(SVGUseElement,SVGUseElementBase)
NS_IMPL_RELEASE_INHERITED(SVGUseElement,SVGUseElementBase)
NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(SVGUseElement)
NS_INTERFACE_TABLE_INHERITED(SVGUseElement, nsIMutationObserver)
NS_INTERFACE_TABLE_TAIL_INHERITING(SVGUseElementBase)
//----------------------------------------------------------------------
// Implementation
SVGUseElement::SVGUseElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: SVGUseElementBase(aNodeInfo), mSource(this)
{
}
SVGUseElement::~SVGUseElement()
{
UnlinkSource();
}
//----------------------------------------------------------------------
// nsIDOMNode methods
nsresult
SVGUseElement::Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const
{
*aResult = nullptr;
already_AddRefed<mozilla::dom::NodeInfo> ni = RefPtr<mozilla::dom::NodeInfo>(aNodeInfo).forget();
SVGUseElement *it = new SVGUseElement(ni);
nsCOMPtr<nsINode> kungFuDeathGrip(it);
nsresult rv1 = it->Init();
nsresult rv2 = const_cast<SVGUseElement*>(this)->CopyInnerTo(it);
// SVGUseElement specific portion - record who we cloned from
it->mOriginal = const_cast<SVGUseElement*>(this);
if (NS_SUCCEEDED(rv1) && NS_SUCCEEDED(rv2)) {
kungFuDeathGrip.swap(*aResult);
}
return NS_FAILED(rv1) ? rv1 : rv2;
}
already_AddRefed<SVGAnimatedString>
SVGUseElement::Href()
{
return mStringAttributes[HREF].IsExplicitlySet()
? mStringAttributes[HREF].ToDOMAnimatedString(this)
: mStringAttributes[XLINK_HREF].ToDOMAnimatedString(this);
}
//----------------------------------------------------------------------
already_AddRefed<SVGAnimatedLength>
SVGUseElement::X()
{
return mLengthAttributes[ATTR_X].ToDOMAnimatedLength(this);
}
already_AddRefed<SVGAnimatedLength>
SVGUseElement::Y()
{
return mLengthAttributes[ATTR_Y].ToDOMAnimatedLength(this);
}
already_AddRefed<SVGAnimatedLength>
SVGUseElement::Width()
{
return mLengthAttributes[ATTR_WIDTH].ToDOMAnimatedLength(this);
}
already_AddRefed<SVGAnimatedLength>
SVGUseElement::Height()
{
return mLengthAttributes[ATTR_HEIGHT].ToDOMAnimatedLength(this);
}
//----------------------------------------------------------------------
// nsIMutationObserver methods
void
SVGUseElement::CharacterDataChanged(nsIDocument *aDocument,
nsIContent *aContent,
CharacterDataChangeInfo* aInfo)
{
if (nsContentUtils::IsInSameAnonymousTree(this, aContent)) {
TriggerReclone();
}
}
void
SVGUseElement::AttributeChanged(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
if (nsContentUtils::IsInSameAnonymousTree(this, aElement)) {
TriggerReclone();
}
}
void
SVGUseElement::ContentAppended(nsIDocument *aDocument,
nsIContent *aContainer,
nsIContent *aFirstNewContent,
int32_t aNewIndexInContainer)
{
if (nsContentUtils::IsInSameAnonymousTree(this, aContainer)) {
TriggerReclone();
}
}
void
SVGUseElement::ContentInserted(nsIDocument *aDocument,
nsIContent *aContainer,
nsIContent *aChild,
int32_t aIndexInContainer)
{
if (nsContentUtils::IsInSameAnonymousTree(this, aChild)) {
TriggerReclone();
}
}
void
SVGUseElement::ContentRemoved(nsIDocument *aDocument,
nsIContent *aContainer,
nsIContent *aChild,
int32_t aIndexInContainer,
nsIContent *aPreviousSibling)
{
if (nsContentUtils::IsInSameAnonymousTree(this, aChild)) {
TriggerReclone();
}
}
void
SVGUseElement::NodeWillBeDestroyed(const nsINode *aNode)
{
nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
UnlinkSource();
}
//----------------------------------------------------------------------
nsIContent*
SVGUseElement::CreateAnonymousContent()
{
mClone = nullptr;
if (mSource.get()) {
mSource.get()->RemoveMutationObserver(this);
}
LookupHref();
nsIContent* targetContent = mSource.get();
if (!targetContent)
return nullptr;
// make sure target is valid type for <use>
// QIable nsSVGGraphicsElement would eliminate enumerating all elements
if (!targetContent->IsAnyOfSVGElements(nsGkAtoms::svg,
nsGkAtoms::symbol,
nsGkAtoms::g,
nsGkAtoms::path,
nsGkAtoms::text,
nsGkAtoms::rect,
nsGkAtoms::circle,
nsGkAtoms::ellipse,
nsGkAtoms::line,
nsGkAtoms::polyline,
nsGkAtoms::polygon,
nsGkAtoms::image,
nsGkAtoms::use))
return nullptr;
// circular loop detection
// check 1 - check if we're a document descendent of the target
if (nsContentUtils::ContentIsDescendantOf(this, targetContent))
return nullptr;
// check 2 - check if we're a clone, and if we already exist in the hierarchy
if (GetParent() && mOriginal) {
for (nsCOMPtr<nsIContent> content = GetParent();
content;
content = content->GetParent()) {
if (content->IsSVGElement(nsGkAtoms::use) &&
static_cast<SVGUseElement*>(content.get())->mOriginal == mOriginal) {
return nullptr;
}
}
}
nsCOMPtr<nsINode> newnode;
nsCOMArray<nsINode> unused;
nsNodeInfoManager* nodeInfoManager =
targetContent->OwnerDoc() == OwnerDoc() ?
nullptr : OwnerDoc()->NodeInfoManager();
nsNodeUtils::Clone(targetContent, true, nodeInfoManager, unused,
getter_AddRefs(newnode));
nsCOMPtr<nsIContent> newcontent = do_QueryInterface(newnode);
if (!newcontent)
return nullptr;
if (newcontent->IsSVGElement(nsGkAtoms::symbol)) {
nsIDocument *document = GetComposedDoc();
if (!document)
return nullptr;
nsNodeInfoManager *nodeInfoManager = document->NodeInfoManager();
if (!nodeInfoManager)
return nullptr;
RefPtr<mozilla::dom::NodeInfo> nodeInfo;
nodeInfo = nodeInfoManager->GetNodeInfo(nsGkAtoms::svg, nullptr,
kNameSpaceID_SVG,
nsIDOMNode::ELEMENT_NODE);
nsCOMPtr<nsIContent> svgNode;
NS_NewSVGSVGElement(getter_AddRefs(svgNode), nodeInfo.forget(),
NOT_FROM_PARSER);
if (!svgNode)
return nullptr;
// copy attributes
BorrowedAttrInfo info;
uint32_t i;
for (i = 0; (info = newcontent->GetAttrInfoAt(i)); i++) {
nsAutoString value;
int32_t nsID = info.mName->NamespaceID();
nsIAtom* lname = info.mName->LocalName();
info.mValue->ToString(value);
svgNode->SetAttr(nsID, lname, info.mName->GetPrefix(), value, false);
}
// move the children over
uint32_t num = newcontent->GetChildCount();
for (i = 0; i < num; i++) {
nsCOMPtr<nsIContent> child = newcontent->GetFirstChild();
newcontent->RemoveChildAt(0, false);
svgNode->InsertChildAt(child, i, true);
}
newcontent = svgNode;
}
if (newcontent->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol)) {
nsSVGElement *newElement = static_cast<nsSVGElement*>(newcontent.get());
if (mLengthAttributes[ATTR_WIDTH].IsExplicitlySet())
newElement->SetLength(nsGkAtoms::width, mLengthAttributes[ATTR_WIDTH]);
if (mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet())
newElement->SetLength(nsGkAtoms::height, mLengthAttributes[ATTR_HEIGHT]);
}
// Set up its base URI correctly
nsCOMPtr<nsIURI> baseURI = targetContent->GetBaseURI();
if (!baseURI)
return nullptr;
newcontent->SetExplicitBaseURI(baseURI);
targetContent->AddMutationObserver(this);
mClone = newcontent;
#ifdef DEBUG
// Our anonymous clone can get restyled by various things
// (e.g. SMIL). Reconstructing its frame is OK, though, because
// it's going to be our _only_ child in the frame tree, so can't get
// mis-ordered with anything.
mClone->SetProperty(nsGkAtoms::restylableAnonymousNode,
reinterpret_cast<void*>(true));
#endif // DEBUG
return mClone;
}
nsIURI*
SVGUseElement::GetSourceDocURI()
{
nsIContent* targetContent = mSource.get();
if (!targetContent)
return nullptr;
return targetContent->OwnerDoc()->GetDocumentURI();
}
void
SVGUseElement::DestroyAnonymousContent()
{
nsContentUtils::DestroyAnonymousContent(&mClone);
}
bool
SVGUseElement::OurWidthAndHeightAreUsed() const
{
return mClone && mClone->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol);
}
//----------------------------------------------------------------------
// implementation helpers
void
SVGUseElement::SyncWidthOrHeight(nsIAtom* aName)
{
NS_ASSERTION(aName == nsGkAtoms::width || aName == nsGkAtoms::height,
"The clue is in the function name");
NS_ASSERTION(OurWidthAndHeightAreUsed(), "Don't call this");
if (OurWidthAndHeightAreUsed()) {
nsSVGElement *target = static_cast<nsSVGElement*>(mClone.get());
uint32_t index = *sLengthInfo[ATTR_WIDTH].mName == aName ? ATTR_WIDTH : ATTR_HEIGHT;
if (mLengthAttributes[index].IsExplicitlySet()) {
target->SetLength(aName, mLengthAttributes[index]);
return;
}
if (mClone->IsSVGElement(nsGkAtoms::svg)) {
// Our width/height attribute is now no longer explicitly set, so we
// need to revert the clone's width/height to the width/height of the
// content that's being cloned.
TriggerReclone();
return;
}
// Our width/height attribute is now no longer explicitly set, so we
// need to set the value to 100%
nsSVGLength2 length;
length.Init(SVGContentUtils::XY, 0xff,
100, nsIDOMSVGLength::SVG_LENGTHTYPE_PERCENTAGE);
target->SetLength(aName, length);
return;
}
}
void
SVGUseElement::LookupHref()
{
nsAutoString href;
if (mStringAttributes[HREF].IsExplicitlySet()) {
mStringAttributes[HREF].GetAnimValue(href, this);
} else {
mStringAttributes[XLINK_HREF].GetAnimValue(href, this);
}
if (href.IsEmpty()) {
return;
}
nsCOMPtr<nsIURI> originURI =
mOriginal ? mOriginal->GetBaseURI() : GetBaseURI();
nsCOMPtr<nsIURI> baseURI = nsContentUtils::IsLocalRefURL(href)
? nsSVGEffects::GetBaseURLForLocalRef(this, originURI)
: originURI;
nsCOMPtr<nsIURI> targetURI;
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
GetComposedDoc(), baseURI);
mSource.Reset(this, targetURI);
}
void
SVGUseElement::TriggerReclone()
{
nsIDocument *doc = GetComposedDoc();
if (!doc)
return;
nsIPresShell *presShell = doc->GetShell();
if (!presShell)
return;
presShell->PostRecreateFramesFor(this);
}
void
SVGUseElement::UnlinkSource()
{
if (mSource.get()) {
mSource.get()->RemoveMutationObserver(this);
}
mSource.Unlink();
}
//----------------------------------------------------------------------
// nsSVGElement methods
/* virtual */ gfxMatrix
SVGUseElement::PrependLocalTransformsTo(
const gfxMatrix &aMatrix, SVGTransformTypes aWhich) const
{
// 'transform' attribute:
gfxMatrix fromUserSpace =
SVGUseElementBase::PrependLocalTransformsTo(aMatrix, aWhich);
if (aWhich == eUserSpaceToParent) {
return fromUserSpace;
}
// our 'x' and 'y' attributes:
float x, y;
const_cast<SVGUseElement*>(this)->GetAnimatedLengthValues(&x, &y, nullptr);
gfxMatrix toUserSpace = gfxMatrix::Translation(x, y);
if (aWhich == eChildToUserSpace) {
return toUserSpace * aMatrix;
}
MOZ_ASSERT(aWhich == eAllTransforms, "Unknown TransformTypes");
return toUserSpace * fromUserSpace;
}
/* virtual */ bool
SVGUseElement::HasValidDimensions() const
{
return (!mLengthAttributes[ATTR_WIDTH].IsExplicitlySet() ||
mLengthAttributes[ATTR_WIDTH].GetAnimValInSpecifiedUnits() > 0) &&
(!mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet() ||
mLengthAttributes[ATTR_HEIGHT].GetAnimValInSpecifiedUnits() > 0);
}
nsSVGElement::LengthAttributesInfo
SVGUseElement::GetLengthInfo()
{
return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
ArrayLength(sLengthInfo));
}
nsSVGElement::StringAttributesInfo
SVGUseElement::GetStringInfo()
{
return StringAttributesInfo(mStringAttributes, sStringInfo,
ArrayLength(sStringInfo));
}
//----------------------------------------------------------------------
// nsIContent methods
NS_IMETHODIMP_(bool)
SVGUseElement::IsAttributeMapped(const nsIAtom* name) const
{
static const MappedAttributeEntry* const map[] = {
sFEFloodMap,
sFiltersMap,
sFontSpecificationMap,
sGradientStopMap,
sLightingEffectsMap,
sMarkersMap,
sTextContentElementsMap,
sViewportsMap
};
return FindAttributeDependence(name, map) ||
SVGUseElementBase::IsAttributeMapped(name);
}
} // namespace dom
} // namespace mozilla
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