зеркало из https://github.com/mozilla/gecko-dev.git
561 строка
19 KiB
C++
561 строка
19 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/SVGUseElement.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/dom/SVGLengthBinding.h"
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#include "mozilla/dom/SVGUseElementBinding.h"
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#include "nsGkAtoms.h"
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#include "mozilla/dom/SVGSVGElement.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/Element.h"
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#include "nsContentUtils.h"
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#include "nsIURI.h"
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#include "mozilla/URLExtraData.h"
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#include "SVGObserverUtils.h"
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#include "nsSVGUseFrame.h"
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NS_IMPL_NS_NEW_SVG_ELEMENT(Use)
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namespace mozilla {
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namespace dom {
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JSObject* SVGUseElement::WrapNode(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return SVGUseElement_Binding::Wrap(aCx, this, aGivenProto);
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}
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////////////////////////////////////////////////////////////////////////
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// implementation
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SVGElement::LengthInfo SVGUseElement::sLengthInfo[4] = {
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{nsGkAtoms::x, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
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SVGContentUtils::X},
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{nsGkAtoms::y, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
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SVGContentUtils::Y},
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{nsGkAtoms::width, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
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SVGContentUtils::X},
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{nsGkAtoms::height, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER,
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SVGContentUtils::Y},
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};
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SVGElement::StringInfo SVGUseElement::sStringInfo[2] = {
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{nsGkAtoms::href, kNameSpaceID_None, true},
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{nsGkAtoms::href, kNameSpaceID_XLink, true}};
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//----------------------------------------------------------------------
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// nsISupports methods
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NS_IMPL_CYCLE_COLLECTION_CLASS(SVGUseElement)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SVGUseElement,
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SVGUseElementBase)
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nsAutoScriptBlocker scriptBlocker;
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mOriginal)
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tmp->UnlinkSource();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SVGUseElement,
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SVGUseElementBase)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOriginal)
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tmp->mReferencedElementTracker.Traverse(&cb);
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(SVGUseElement, SVGUseElementBase,
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nsIMutationObserver)
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//----------------------------------------------------------------------
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// Implementation
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SVGUseElement::SVGUseElement(
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
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: SVGUseElementBase(std::move(aNodeInfo)),
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mReferencedElementTracker(this) {}
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SVGUseElement::~SVGUseElement() {
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UnlinkSource();
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MOZ_DIAGNOSTIC_ASSERT(!OwnerDoc()->SVGUseElementNeedsShadowTreeUpdate(*this),
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"Dying without unbinding?");
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}
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//----------------------------------------------------------------------
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// nsINode methods
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void SVGUseElement::ProcessAttributeChange(int32_t aNamespaceID,
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nsAtom* aAttribute) {
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if (aNamespaceID == kNameSpaceID_None) {
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if (aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y) {
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if (auto* frame = GetFrame()) {
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frame->PositionAttributeChanged();
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}
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} else if (aAttribute == nsGkAtoms::width ||
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aAttribute == nsGkAtoms::height) {
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const bool hadValidDimensions = HasValidDimensions();
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const bool isUsed = OurWidthAndHeightAreUsed();
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if (isUsed) {
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SyncWidthOrHeight(aAttribute);
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}
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if (auto* frame = GetFrame()) {
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frame->DimensionAttributeChanged(hadValidDimensions, isUsed);
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}
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}
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}
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if ((aNamespaceID == kNameSpaceID_XLink ||
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aNamespaceID == kNameSpaceID_None) &&
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aAttribute == nsGkAtoms::href) {
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// We're changing our nature, clear out the clone information.
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if (auto* frame = GetFrame()) {
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frame->HrefChanged();
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}
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mOriginal = nullptr;
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UnlinkSource();
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TriggerReclone();
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}
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}
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nsresult SVGUseElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aAttribute,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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nsIPrincipal* aSubjectPrincipal,
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bool aNotify) {
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ProcessAttributeChange(aNamespaceID, aAttribute);
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return SVGUseElementBase::AfterSetAttr(aNamespaceID, aAttribute, aValue,
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aOldValue, aSubjectPrincipal, aNotify);
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}
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nsresult SVGUseElement::Clone(dom::NodeInfo* aNodeInfo,
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nsINode** aResult) const {
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*aResult = nullptr;
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SVGUseElement* it =
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new (aNodeInfo->NodeInfoManager()) SVGUseElement(do_AddRef(aNodeInfo));
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nsCOMPtr<nsINode> kungFuDeathGrip(it);
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nsresult rv1 = it->Init();
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nsresult rv2 = const_cast<SVGUseElement*>(this)->CopyInnerTo(it);
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// SVGUseElement specific portion - record who we cloned from
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it->mOriginal = const_cast<SVGUseElement*>(this);
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if (NS_SUCCEEDED(rv1) && NS_SUCCEEDED(rv2)) {
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kungFuDeathGrip.swap(*aResult);
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}
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return NS_FAILED(rv1) ? rv1 : rv2;
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}
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nsresult SVGUseElement::BindToTree(BindContext& aContext, nsINode& aParent) {
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nsresult rv = SVGUseElementBase::BindToTree(aContext, aParent);
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NS_ENSURE_SUCCESS(rv, rv);
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TriggerReclone();
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return NS_OK;
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}
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void SVGUseElement::UnbindFromTree(bool aNullParent) {
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SVGUseElementBase::UnbindFromTree(aNullParent);
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OwnerDoc()->UnscheduleSVGUseElementShadowTreeUpdate(*this);
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}
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already_AddRefed<DOMSVGAnimatedString> SVGUseElement::Href() {
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return mStringAttributes[HREF].IsExplicitlySet()
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? mStringAttributes[HREF].ToDOMAnimatedString(this)
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: mStringAttributes[XLINK_HREF].ToDOMAnimatedString(this);
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}
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//----------------------------------------------------------------------
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already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::X() {
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return mLengthAttributes[ATTR_X].ToDOMAnimatedLength(this);
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}
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already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::Y() {
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return mLengthAttributes[ATTR_Y].ToDOMAnimatedLength(this);
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}
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already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::Width() {
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return mLengthAttributes[ATTR_WIDTH].ToDOMAnimatedLength(this);
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}
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already_AddRefed<DOMSVGAnimatedLength> SVGUseElement::Height() {
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return mLengthAttributes[ATTR_HEIGHT].ToDOMAnimatedLength(this);
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}
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//----------------------------------------------------------------------
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// nsIMutationObserver methods
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void SVGUseElement::CharacterDataChanged(nsIContent* aContent,
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const CharacterDataChangeInfo&) {
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aContent)) {
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TriggerReclone();
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}
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}
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void SVGUseElement::AttributeChanged(Element* aElement, int32_t aNamespaceID,
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nsAtom* aAttribute, int32_t aModType,
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const nsAttrValue* aOldValue) {
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aElement)) {
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TriggerReclone();
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}
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}
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void SVGUseElement::ContentAppended(nsIContent* aFirstNewContent) {
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// FIXME(emilio, bug 1442336): Why does this check the parent but
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// ContentInserted the child?
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aFirstNewContent->GetParent())) {
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TriggerReclone();
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}
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}
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void SVGUseElement::ContentInserted(nsIContent* aChild) {
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// FIXME(emilio, bug 1442336): Why does this check the child but
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// ContentAppended the parent?
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aChild)) {
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TriggerReclone();
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}
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}
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void SVGUseElement::ContentRemoved(nsIContent* aChild,
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nsIContent* aPreviousSibling) {
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if (nsContentUtils::IsInSameAnonymousTree(mReferencedElementTracker.get(),
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aChild)) {
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TriggerReclone();
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}
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}
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void SVGUseElement::NodeWillBeDestroyed(const nsINode* aNode) {
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nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
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UnlinkSource();
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}
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// Returns whether this node could ever be displayed.
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static bool NodeCouldBeRendered(const nsINode& aNode) {
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if (aNode.IsSVGElement(nsGkAtoms::symbol)) {
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// Only <symbol> elements in the root of a <svg:use> shadow tree are
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// displayed.
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auto* shadowRoot = ShadowRoot::FromNodeOrNull(aNode.GetParentNode());
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return shadowRoot && shadowRoot->Host()->IsSVGElement(nsGkAtoms::use);
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}
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// TODO: Do we have other cases we can optimize out easily?
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return true;
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}
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// Circular loop detection, plus detection of whether this shadow tree is
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// rendered at all.
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auto SVGUseElement::ScanAncestors(const Element& aTarget) const -> ScanResult {
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if (&aTarget == this) {
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return ScanResult::CyclicReference;
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}
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if (mOriginal &&
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mOriginal->ScanAncestors(aTarget) == ScanResult::CyclicReference) {
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return ScanResult::CyclicReference;
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}
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auto result = ScanResult::Ok;
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for (nsINode* parent = GetParentOrShadowHostNode(); parent;
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parent = parent->GetParentOrShadowHostNode()) {
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if (parent == &aTarget) {
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return ScanResult::CyclicReference;
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}
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if (auto* use = SVGUseElement::FromNode(*parent)) {
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if (mOriginal && use->mOriginal == mOriginal) {
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return ScanResult::CyclicReference;
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}
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}
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// Do we have other similar cases we can optimize out easily?
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if (!NodeCouldBeRendered(*parent)) {
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// NOTE(emilio): We can't just return here. If we're cyclic, we need to
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// know.
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result = ScanResult::Invisible;
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}
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}
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return result;
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}
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//----------------------------------------------------------------------
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void SVGUseElement::UpdateShadowTree() {
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MOZ_ASSERT(IsInComposedDoc());
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if (mReferencedElementTracker.get()) {
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mReferencedElementTracker.get()->RemoveMutationObserver(this);
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}
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LookupHref();
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RefPtr<ShadowRoot> shadow = GetShadowRoot();
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if (!shadow) {
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shadow = AttachShadowWithoutNameChecks(ShadowRootMode::Closed);
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}
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MOZ_ASSERT(shadow);
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Element* targetElement = mReferencedElementTracker.get();
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RefPtr<Element> newElement;
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auto UpdateShadowTree = mozilla::MakeScopeExit([&]() {
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nsIContent* firstChild = shadow->GetFirstChild();
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if (firstChild) {
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MOZ_ASSERT(!firstChild->GetNextSibling());
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shadow->RemoveChildNode(firstChild, /* aNotify = */ true);
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}
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if (newElement) {
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shadow->AppendChildTo(newElement, /* aNotify = */ true);
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}
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});
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// make sure target is valid type for <use>
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// QIable nsSVGGraphicsElement would eliminate enumerating all elements
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if (!targetElement ||
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!targetElement->IsAnyOfSVGElements(
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nsGkAtoms::svg, nsGkAtoms::symbol, nsGkAtoms::g, nsGkAtoms::path,
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nsGkAtoms::text, nsGkAtoms::rect, nsGkAtoms::circle,
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nsGkAtoms::ellipse, nsGkAtoms::line, nsGkAtoms::polyline,
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nsGkAtoms::polygon, nsGkAtoms::image, nsGkAtoms::use)) {
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return;
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}
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if (ScanAncestors(*targetElement) != ScanResult::Ok) {
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return;
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}
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nsCOMPtr<nsIURI> baseURI = targetElement->GetBaseURI();
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if (!baseURI) {
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return;
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}
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{
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nsNodeInfoManager* nodeInfoManager = targetElement->OwnerDoc() == OwnerDoc()
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? nullptr
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: OwnerDoc()->NodeInfoManager();
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nsCOMPtr<nsINode> newNode =
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targetElement->Clone(true, nodeInfoManager, IgnoreErrors());
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if (!newNode) {
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return;
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}
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MOZ_ASSERT(newNode->IsElement());
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newElement = newNode.forget().downcast<Element>();
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}
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if (newElement->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol)) {
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auto* newSVGElement = static_cast<SVGElement*>(newElement.get());
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if (mLengthAttributes[ATTR_WIDTH].IsExplicitlySet())
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newSVGElement->SetLength(nsGkAtoms::width, mLengthAttributes[ATTR_WIDTH]);
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if (mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet())
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newSVGElement->SetLength(nsGkAtoms::height,
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mLengthAttributes[ATTR_HEIGHT]);
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}
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// Bug 1415044 the specs do not say which referrer information we should use.
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// This may change if there's any spec comes out.
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auto referrerInfo = MakeRefPtr<ReferrerInfo>(*this);
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mContentURLData = new URLExtraData(baseURI.forget(), referrerInfo.forget(),
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do_AddRef(NodePrincipal()));
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targetElement->AddMutationObserver(this);
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}
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nsIURI* SVGUseElement::GetSourceDocURI() {
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nsIContent* targetElement = mReferencedElementTracker.get();
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if (!targetElement) {
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return nullptr;
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}
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return targetElement->OwnerDoc()->GetDocumentURI();
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}
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const Encoding* SVGUseElement::GetSourceDocCharacterSet() {
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nsIContent* targetElement = mReferencedElementTracker.get();
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if (!targetElement) {
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return nullptr;
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}
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return targetElement->OwnerDoc()->GetDocumentCharacterSet();
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}
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static nsINode* GetClonedChild(const SVGUseElement& aUseElement) {
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const ShadowRoot* shadow = aUseElement.GetShadowRoot();
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return shadow ? shadow->GetFirstChild() : nullptr;
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}
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bool SVGUseElement::OurWidthAndHeightAreUsed() const {
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nsINode* clonedChild = GetClonedChild(*this);
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return clonedChild &&
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clonedChild->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol);
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}
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//----------------------------------------------------------------------
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// implementation helpers
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void SVGUseElement::SyncWidthOrHeight(nsAtom* aName) {
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NS_ASSERTION(aName == nsGkAtoms::width || aName == nsGkAtoms::height,
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"The clue is in the function name");
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NS_ASSERTION(OurWidthAndHeightAreUsed(), "Don't call this");
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if (!OurWidthAndHeightAreUsed()) {
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return;
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}
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auto* target = SVGElement::FromNode(GetClonedChild(*this));
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uint32_t index =
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sLengthInfo[ATTR_WIDTH].mName == aName ? ATTR_WIDTH : ATTR_HEIGHT;
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if (mLengthAttributes[index].IsExplicitlySet()) {
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target->SetLength(aName, mLengthAttributes[index]);
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return;
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}
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if (target->IsSVGElement(nsGkAtoms::svg)) {
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// Our width/height attribute is now no longer explicitly set, so we
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// need to revert the clone's width/height to the width/height of the
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// content that's being cloned.
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TriggerReclone();
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return;
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}
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// Our width/height attribute is now no longer explicitly set, so we
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// need to set the value to 100%
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SVGAnimatedLength length;
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length.Init(SVGContentUtils::XY, 0xff, 100,
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SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE);
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target->SetLength(aName, length);
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}
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void SVGUseElement::LookupHref() {
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nsAutoString href;
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if (mStringAttributes[HREF].IsExplicitlySet()) {
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mStringAttributes[HREF].GetAnimValue(href, this);
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} else {
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mStringAttributes[XLINK_HREF].GetAnimValue(href, this);
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}
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if (href.IsEmpty()) {
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return;
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}
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nsCOMPtr<nsIURI> originURI =
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mOriginal ? mOriginal->GetBaseURI() : GetBaseURI();
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nsCOMPtr<nsIURI> baseURI =
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nsContentUtils::IsLocalRefURL(href)
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? SVGObserverUtils::GetBaseURLForLocalRef(this, originURI)
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: originURI;
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nsCOMPtr<nsIURI> targetURI;
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nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
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GetComposedDoc(), baseURI);
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nsCOMPtr<nsIReferrerInfo> referrerInfo =
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ReferrerInfo::CreateForSVGResources(OwnerDoc());
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mReferencedElementTracker.ResetToURIFragmentID(this, targetURI, referrerInfo);
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}
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void SVGUseElement::TriggerReclone() {
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if (Document* doc = GetComposedDoc()) {
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doc->ScheduleSVGUseElementShadowTreeUpdate(*this);
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}
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}
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void SVGUseElement::UnlinkSource() {
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if (mReferencedElementTracker.get()) {
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mReferencedElementTracker.get()->RemoveMutationObserver(this);
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}
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mReferencedElementTracker.Unlink();
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}
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//----------------------------------------------------------------------
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// SVGElement methods
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/* virtual */
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gfxMatrix SVGUseElement::PrependLocalTransformsTo(
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const gfxMatrix& aMatrix, SVGTransformTypes aWhich) const {
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// 'transform' attribute:
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gfxMatrix userToParent;
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if (aWhich == eUserSpaceToParent || aWhich == eAllTransforms) {
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userToParent = GetUserToParentTransform(mAnimateMotionTransform.get(),
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mTransforms.get());
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if (aWhich == eUserSpaceToParent) {
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return userToParent * aMatrix;
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}
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}
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// our 'x' and 'y' attributes:
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float x, y;
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const_cast<SVGUseElement*>(this)->GetAnimatedLengthValues(&x, &y, nullptr);
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gfxMatrix childToUser = gfxMatrix::Translation(x, y);
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|
|
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
|