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gecko-dev/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/dom/SVGUseElement.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/dom/SVGLengthBinding.h"
#include "mozilla/dom/SVGUseElementBinding.h"
#include "nsGkAtoms.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "mozilla/dom/Document.h"
#include "nsIPresShell.h"
#include "mozilla/dom/Element.h"
#include "nsContentUtils.h"
#include "nsIURI.h"
#include "mozilla/URLExtraData.h"
#include "SVGObserverUtils.h"
#include "nsSVGUseFrame.h"
#include "mozilla/net/ReferrerPolicy.h"
NS_IMPL_NS_NEW_SVG_ELEMENT(Use)
namespace mozilla {
namespace dom {
JSObject* SVGUseElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return SVGUseElement_Binding::Wrap(aCx, this, aGivenProto);
}
////////////////////////////////////////////////////////////////////////
// implementation
SVGElement::LengthInfo SVGUseElement::sLengthInfo[4] = {
{nsGkAtoms::x, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
SVGContentUtils::X},
{nsGkAtoms::y, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
SVGContentUtils::Y},
{nsGkAtoms::width, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
SVGContentUtils::X},
{nsGkAtoms::height, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
SVGContentUtils::Y},
};
SVGElement::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->UnlinkSource();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SVGUseElement,
SVGUseElementBase)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOriginal)
tmp->mReferencedElementTracker.Traverse(&cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(SVGUseElement, SVGUseElementBase,
nsIMutationObserver)
//----------------------------------------------------------------------
// Implementation
SVGUseElement::SVGUseElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: SVGUseElementBase(std::move(aNodeInfo)),
mReferencedElementTracker(this) {}
SVGUseElement::~SVGUseElement() {
UnlinkSource();
MOZ_DIAGNOSTIC_ASSERT(!OwnerDoc()->SVGUseElementNeedsShadowTreeUpdate(*this),
"Dying without unbinding?");
}
//----------------------------------------------------------------------
// nsINode methods
void SVGUseElement::ProcessAttributeChange(int32_t aNamespaceID,
nsAtom* aAttribute) {
if (aNamespaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y) {
if (auto* frame = GetFrame()) {
frame->PositionAttributeChanged();
}
} else if (aAttribute == nsGkAtoms::width ||
aAttribute == nsGkAtoms::height) {
const bool hadValidDimensions = HasValidDimensions();
const bool isUsed = OurWidthAndHeightAreUsed();
if (isUsed) {
SyncWidthOrHeight(aAttribute);
}
if (auto* frame = GetFrame()) {
frame->DimensionAttributeChanged(hadValidDimensions, isUsed);
}
}
}
if ((aNamespaceID == kNameSpaceID_XLink ||
aNamespaceID == kNameSpaceID_None) &&
aAttribute == nsGkAtoms::href) {
// We're changing our nature, clear out the clone information.
if (auto* frame = GetFrame()) {
frame->HrefChanged();
}
mOriginal = nullptr;
UnlinkSource();
TriggerReclone();
}
}
nsresult SVGUseElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aAttribute,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue,
nsIPrincipal* aSubjectPrincipal,
bool aNotify) {
ProcessAttributeChange(aNamespaceID, aAttribute);
return SVGUseElementBase::AfterSetAttr(aNamespaceID, aAttribute, aValue,
aOldValue, aSubjectPrincipal, aNotify);
}
nsresult SVGUseElement::Clone(dom::NodeInfo* aNodeInfo,
nsINode** aResult) const {
*aResult = nullptr;
SVGUseElement* it = new SVGUseElement(do_AddRef(aNodeInfo));
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;
}
nsresult SVGUseElement::BindToTree(Document* aDocument, nsIContent* aParent,
nsIContent* aBindingParent) {
nsresult rv =
SVGUseElementBase::BindToTree(aDocument, aParent, aBindingParent);
NS_ENSURE_SUCCESS(rv, rv);
TriggerReclone();
return NS_OK;
}
void SVGUseElement::UnbindFromTree(bool aDeep, bool aNullParent) {
SVGUseElementBase::UnbindFromTree(aDeep, aNullParent);
OwnerDoc()->UnscheduleSVGUseElementShadowTreeUpdate(*this);
}
already_AddRefed<DOMSVGAnimatedString> SVGUseElement::Href() {
return mStringAttributes[HREF].IsExplicitlySet()
? mStringAttributes[HREF].ToDOMAnimatedString(this)
: mStringAttributes[XLINK_HREF].ToDOMAnimatedString(this);
}
//----------------------------------------------------------------------
already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::X() {
return mLengthAttributes[ATTR_X].ToDOMAnimatedLength(this);
}
already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::Y() {
return mLengthAttributes[ATTR_Y].ToDOMAnimatedLength(this);
}
already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::Width() {
return mLengthAttributes[ATTR_WIDTH].ToDOMAnimatedLength(this);
}
already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::Height() {
return mLengthAttributes[ATTR_HEIGHT].ToDOMAnimatedLength(this);
}
//----------------------------------------------------------------------
// nsIMutationObserver methods
void SVGUseElement::CharacterDataChanged(nsIContent* aContent,
const CharacterDataChangeInfo&) {
if (nsContentUtils::IsInSameAnonymousTree(this, aContent)) {
TriggerReclone();
}
}
void SVGUseElement::AttributeChanged(Element* aElement, int32_t aNamespaceID,
nsAtom* aAttribute, int32_t aModType,
const nsAttrValue* aOldValue) {
if (nsContentUtils::IsInSameAnonymousTree(this, aElement)) {
TriggerReclone();
}
}
void SVGUseElement::ContentAppended(nsIContent* aFirstNewContent) {
// FIXME(emilio, bug 1442336): Why does this check the parent but
// ContentInserted the child?
if (nsContentUtils::IsInSameAnonymousTree(this,
aFirstNewContent->GetParent())) {
TriggerReclone();
}
}
void SVGUseElement::ContentInserted(nsIContent* aChild) {
// FIXME(emilio, bug 1442336): Why does this check the child but
// ContentAppended the parent?
if (nsContentUtils::IsInSameAnonymousTree(this, aChild)) {
TriggerReclone();
}
}
void SVGUseElement::ContentRemoved(nsIContent* aChild,
nsIContent* aPreviousSibling) {
if (nsContentUtils::IsInSameAnonymousTree(this, aChild)) {
TriggerReclone();
}
}
void SVGUseElement::NodeWillBeDestroyed(const nsINode* aNode) {
nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
UnlinkSource();
}
//----------------------------------------------------------------------
void SVGUseElement::UpdateShadowTree() {
MOZ_ASSERT(IsInComposedDoc());
if (mReferencedElementTracker.get()) {
mReferencedElementTracker.get()->RemoveMutationObserver(this);
}
LookupHref();
RefPtr<ShadowRoot> shadow = GetShadowRoot();
if (!shadow) {
shadow = AttachShadowWithoutNameChecks(ShadowRootMode::Closed);
}
MOZ_ASSERT(shadow);
Element* targetElement = mReferencedElementTracker.get();
RefPtr<Element> newElement;
auto UpdateShadowTree = mozilla::MakeScopeExit([&]() {
nsIContent* firstChild = shadow->GetFirstChild();
if (firstChild) {
MOZ_ASSERT(!firstChild->GetNextSibling());
shadow->RemoveChildNode(firstChild, /* aNotify = */ true);
}
if (newElement) {
shadow->AppendChildTo(newElement, /* aNotify = */ true);
}
});
// make sure target is valid type for <use>
// QIable nsSVGGraphicsElement would eliminate enumerating all elements
if (!targetElement ||
!targetElement->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;
}
// circular loop detection
// check 1 - check if we're a document descendent of the target
if (nsContentUtils::ContentIsShadowIncludingDescendantOf(this,
targetElement)) {
return;
}
// check 2 - check if we're a clone, and if we already exist in the hierarchy
if (mOriginal) {
for (nsINode* parent = GetParentOrHostNode(); parent;
parent = parent->GetParentOrHostNode()) {
SVGUseElement* use = SVGUseElement::FromNode(*parent);
if (use && use->mOriginal == mOriginal) {
return;
}
}
}
nsCOMPtr<nsIURI> baseURI = targetElement->GetBaseURI();
if (!baseURI) {
return;
}
{
nsNodeInfoManager* nodeInfoManager = targetElement->OwnerDoc() == OwnerDoc()
? nullptr
: OwnerDoc()->NodeInfoManager();
nsCOMPtr<nsINode> newNode = nsNodeUtils::Clone(
targetElement, true, nodeInfoManager, nullptr, IgnoreErrors());
if (!newNode) {
return;
}
MOZ_ASSERT(newNode->IsElement());
newElement = newNode.forget().downcast<Element>();
}
if (newElement->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol)) {
auto* newSVGElement = static_cast<SVGElement*>(newElement.get());
if (mLengthAttributes[ATTR_WIDTH].IsExplicitlySet())
newSVGElement->SetLength(nsGkAtoms::width, mLengthAttributes[ATTR_WIDTH]);
if (mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet())
newSVGElement->SetLength(nsGkAtoms::height,
mLengthAttributes[ATTR_HEIGHT]);
}
// The specs do not say which referrer policy we should use, pass RP_Unset for
// now
mContentURLData = new URLExtraData(
baseURI.forget(), do_AddRef(OwnerDoc()->GetDocumentURI()),
do_AddRef(NodePrincipal()), mozilla::net::RP_Unset);
targetElement->AddMutationObserver(this);
}
nsIURI* SVGUseElement::GetSourceDocURI() {
nsIContent* targetElement = mReferencedElementTracker.get();
if (!targetElement) {
return nullptr;
}
return targetElement->OwnerDoc()->GetDocumentURI();
}
static nsINode* GetClonedChild(const SVGUseElement& aUseElement) {
const ShadowRoot* shadow = aUseElement.GetShadowRoot();
return shadow ? shadow->GetFirstChild() : nullptr;
}
bool SVGUseElement::OurWidthAndHeightAreUsed() const {
nsINode* clonedChild = GetClonedChild(*this);
return clonedChild &&
clonedChild->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol);
}
//----------------------------------------------------------------------
// implementation helpers
void SVGUseElement::SyncWidthOrHeight(nsAtom* 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()) {
return;
}
auto* target = SVGElement::FromNode(GetClonedChild(*this));
uint32_t index =
sLengthInfo[ATTR_WIDTH].mName == aName ? ATTR_WIDTH : ATTR_HEIGHT;
if (mLengthAttributes[index].IsExplicitlySet()) {
target->SetLength(aName, mLengthAttributes[index]);
return;
}
if (target->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,
SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE);
target->SetLength(aName, length);
}
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)
? SVGObserverUtils::GetBaseURLForLocalRef(this, originURI)
: originURI;
nsCOMPtr<nsIURI> targetURI;
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
GetComposedDoc(), baseURI);
// Bug 1415044 to investigate which referrer we should use
mReferencedElementTracker.ResetToURIFragmentID(
this, targetURI, OwnerDoc()->GetDocumentURI(),
OwnerDoc()->GetReferrerPolicy());
}
void SVGUseElement::TriggerReclone() {
if (Document* doc = GetComposedDoc()) {
doc->ScheduleSVGUseElementShadowTreeUpdate(*this);
}
}
void SVGUseElement::UnlinkSource() {
if (mReferencedElementTracker.get()) {
mReferencedElementTracker.get()->RemoveMutationObserver(this);
}
mReferencedElementTracker.Unlink();
}
//----------------------------------------------------------------------
// SVGElement methods
/* virtual */
gfxMatrix SVGUseElement::PrependLocalTransformsTo(
const gfxMatrix& aMatrix, SVGTransformTypes aWhich) const {
// 'transform' attribute:
gfxMatrix userToParent;
if (aWhich == eUserSpaceToParent || aWhich == eAllTransforms) {
userToParent =
GetUserToParentTransform(mAnimateMotionTransform, mTransforms);
if (aWhich == eUserSpaceToParent) {
return userToParent * aMatrix;
}
}
// our 'x' and 'y' attributes:
float x, y;
const_cast<SVGUseElement*>(this)->GetAnimatedLengthValues(&x, &y, nullptr);
gfxMatrix childToUser = gfxMatrix::Translation(x, y);
if (aWhich == eAllTransforms) {
return childToUser * userToParent * aMatrix;
}
MOZ_ASSERT(aWhich == eChildToUserSpace, "Unknown TransformTypes");
// The following may look broken because pre-multiplying our eChildToUserSpace
// transform with another matrix without including our eUserSpaceToParent
// transform between the two wouldn't make sense. We don't expect that to
// ever happen though. We get here either when the identity matrix has been
// passed because our caller just wants our eChildToUserSpace transform, or
// when our eUserSpaceToParent transform has already been multiplied into the
// matrix that our caller passes (such as when we're called from PaintSVG).
return childToUser * aMatrix;
}
/* virtual */
bool SVGUseElement::HasValidDimensions() const {
return (!mLengthAttributes[ATTR_WIDTH].IsExplicitlySet() ||
mLengthAttributes[ATTR_WIDTH].GetAnimValInSpecifiedUnits() > 0) &&
(!mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet() ||
mLengthAttributes[ATTR_HEIGHT].GetAnimValInSpecifiedUnits() > 0);
}
SVGElement::LengthAttributesInfo SVGUseElement::GetLengthInfo() {
return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
ArrayLength(sLengthInfo));
}
SVGElement::StringAttributesInfo SVGUseElement::GetStringInfo() {
return StringAttributesInfo(mStringAttributes, sStringInfo,
ArrayLength(sStringInfo));
}
nsSVGUseFrame* SVGUseElement::GetFrame() const {
nsIFrame* frame = GetPrimaryFrame();
// We might be a plain nsSVGContainerFrame if we didn't pass the conditional
// processing checks.
if (!frame || !frame->IsSVGUseFrame()) {
MOZ_ASSERT_IF(frame, frame->Type() == LayoutFrameType::None);
return nullptr;
}
return static_cast<nsSVGUseFrame*>(frame);
}
//----------------------------------------------------------------------
// nsIContent methods
NS_IMETHODIMP_(bool)
SVGUseElement::IsAttributeMapped(const nsAtom* 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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