зеркало из https://github.com/mozilla/gecko-dev.git
500 строки
15 KiB
C++
500 строки
15 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/ArrayUtils.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/dom/SVGUseElement.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 "nsIDocument.h"
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#include "nsIPresShell.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_NAMESPACED_SVG_ELEMENT(Use)
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namespace mozilla {
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namespace dom {
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JSObject*
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SVGUseElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
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{
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return SVGUseElementBinding::Wrap(aCx, this, aGivenProto);
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}
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////////////////////////////////////////////////////////////////////////
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// implementation
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nsSVGElement::LengthInfo SVGUseElement::sLengthInfo[4] =
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{
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{ &nsGkAtoms::x, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
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{ &nsGkAtoms::y, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
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{ &nsGkAtoms::width, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
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{ &nsGkAtoms::height, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
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};
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nsSVGElement::StringInfo SVGUseElement::sStringInfo[2] =
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{
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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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//----------------------------------------------------------------------
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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,
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SVGUseElementBase,
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nsIMutationObserver)
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//----------------------------------------------------------------------
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// Implementation
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SVGUseElement::SVGUseElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
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: SVGUseElementBase(aNodeInfo)
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, mReferencedElementTracker(this)
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{
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}
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SVGUseElement::~SVGUseElement()
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{
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UnlinkSource();
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}
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//----------------------------------------------------------------------
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// nsIDOMNode methods
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nsresult
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SVGUseElement::Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult,
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bool aPreallocateChildren) const
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{
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*aResult = nullptr;
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already_AddRefed<mozilla::dom::NodeInfo> ni = RefPtr<mozilla::dom::NodeInfo>(aNodeInfo).forget();
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SVGUseElement *it = new SVGUseElement(ni);
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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, aPreallocateChildren);
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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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already_AddRefed<SVGAnimatedString>
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SVGUseElement::Href()
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{
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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<SVGAnimatedLength>
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SVGUseElement::X()
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{
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return mLengthAttributes[ATTR_X].ToDOMAnimatedLength(this);
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}
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already_AddRefed<SVGAnimatedLength>
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SVGUseElement::Y()
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{
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return mLengthAttributes[ATTR_Y].ToDOMAnimatedLength(this);
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}
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already_AddRefed<SVGAnimatedLength>
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SVGUseElement::Width()
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{
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return mLengthAttributes[ATTR_WIDTH].ToDOMAnimatedLength(this);
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}
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already_AddRefed<SVGAnimatedLength>
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SVGUseElement::Height()
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{
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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
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SVGUseElement::CharacterDataChanged(nsIDocument *aDocument,
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nsIContent *aContent,
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CharacterDataChangeInfo* aInfo)
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{
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if (nsContentUtils::IsInSameAnonymousTree(this, aContent)) {
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TriggerReclone();
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}
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}
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void
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SVGUseElement::AttributeChanged(nsIDocument* aDocument,
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Element* aElement,
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int32_t aNameSpaceID,
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nsAtom* aAttribute,
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int32_t aModType,
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const nsAttrValue* aOldValue)
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{
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if (nsContentUtils::IsInSameAnonymousTree(this, aElement)) {
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TriggerReclone();
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}
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}
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void
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SVGUseElement::ContentAppended(nsIDocument *aDocument,
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nsIContent *aContainer,
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nsIContent *aFirstNewContent)
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{
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if (nsContentUtils::IsInSameAnonymousTree(this, aContainer)) {
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TriggerReclone();
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}
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}
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void
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SVGUseElement::ContentInserted(nsIDocument *aDocument,
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nsIContent *aContainer,
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nsIContent *aChild)
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{
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if (nsContentUtils::IsInSameAnonymousTree(this, aChild)) {
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TriggerReclone();
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}
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}
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void
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SVGUseElement::ContentRemoved(nsIDocument *aDocument,
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nsIContent *aContainer,
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nsIContent *aChild,
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nsIContent *aPreviousSibling)
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{
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if (nsContentUtils::IsInSameAnonymousTree(this, aChild)) {
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TriggerReclone();
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}
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}
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void
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SVGUseElement::NodeWillBeDestroyed(const nsINode *aNode)
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{
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nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
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UnlinkSource();
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}
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//----------------------------------------------------------------------
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already_AddRefed<nsIContent>
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SVGUseElement::CreateAnonymousContent()
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{
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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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nsIContent* targetContent = mReferencedElementTracker.get();
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if (!targetContent)
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return nullptr;
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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 (!targetContent->IsAnyOfSVGElements(nsGkAtoms::svg,
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nsGkAtoms::symbol,
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nsGkAtoms::g,
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nsGkAtoms::path,
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nsGkAtoms::text,
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nsGkAtoms::rect,
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nsGkAtoms::circle,
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nsGkAtoms::ellipse,
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nsGkAtoms::line,
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nsGkAtoms::polyline,
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nsGkAtoms::polygon,
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nsGkAtoms::image,
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nsGkAtoms::use))
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return nullptr;
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// circular loop detection
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// check 1 - check if we're a document descendent of the target
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if (nsContentUtils::ContentIsDescendantOf(this, targetContent))
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return nullptr;
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// check 2 - check if we're a clone, and if we already exist in the hierarchy
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if (GetParent() && mOriginal) {
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for (nsCOMPtr<nsIContent> content = GetParent();
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content;
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content = content->GetParent()) {
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if (content->IsSVGElement(nsGkAtoms::use) &&
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static_cast<SVGUseElement*>(content.get())->mOriginal == mOriginal) {
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return nullptr;
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}
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}
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}
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nsNodeInfoManager* nodeInfoManager =
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targetContent->OwnerDoc() == OwnerDoc() ?
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nullptr : OwnerDoc()->NodeInfoManager();
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IgnoredErrorResult rv;
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nsCOMPtr<nsINode> newnode =
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nsNodeUtils::Clone(targetContent, true, nodeInfoManager, nullptr, rv);
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nsCOMPtr<nsIContent> newcontent = do_QueryInterface(newnode);
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if (!newcontent)
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return nullptr;
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if (newcontent->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol)) {
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nsSVGElement *newElement = static_cast<nsSVGElement*>(newcontent.get());
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if (mLengthAttributes[ATTR_WIDTH].IsExplicitlySet())
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newElement->SetLength(nsGkAtoms::width, mLengthAttributes[ATTR_WIDTH]);
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if (mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet())
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newElement->SetLength(nsGkAtoms::height, mLengthAttributes[ATTR_HEIGHT]);
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}
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// Store the base URI
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nsCOMPtr<nsIURI> baseURI = targetContent->GetBaseURI();
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if (!baseURI) {
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return nullptr;
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}
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mContentURLData = new URLExtraData(baseURI.forget(),
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do_AddRef(OwnerDoc()->GetDocumentURI()),
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do_AddRef(NodePrincipal()));
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targetContent->AddMutationObserver(this);
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#ifdef DEBUG
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// Our anonymous clone can get restyled by various things
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// (e.g. SMIL). Reconstructing its frame is OK, though, because
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// it's going to be our _only_ child in the frame tree, so can't get
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// mis-ordered with anything.
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newcontent->SetProperty(nsGkAtoms::restylableAnonymousNode,
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reinterpret_cast<void*>(true));
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#endif // DEBUG
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return newcontent.forget();
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}
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nsIURI*
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SVGUseElement::GetSourceDocURI()
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{
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nsIContent* targetContent = mReferencedElementTracker.get();
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if (!targetContent)
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return nullptr;
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return targetContent->OwnerDoc()->GetDocumentURI();
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}
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bool
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SVGUseElement::OurWidthAndHeightAreUsed() const
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{
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auto* frame = GetFrame();
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if (!frame || !frame->GetContentClone()) {
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return false;
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}
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return frame->GetContentClone()->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol);
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}
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//----------------------------------------------------------------------
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// implementation helpers
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void
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SVGUseElement::SyncWidthOrHeight(nsAtom* aName)
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{
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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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auto* frame = GetFrame();
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nsIContent* clone = frame ? frame->GetContentClone() : nullptr;
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if (OurWidthAndHeightAreUsed()) {
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auto* target = static_cast<nsSVGElement*>(clone);
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uint32_t index = *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 (clone->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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nsSVGLength2 length;
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length.Init(SVGContentUtils::XY, 0xff,
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100, nsIDOMSVGLength::SVG_LENGTHTYPE_PERCENTAGE);
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target->SetLength(aName, length);
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return;
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}
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}
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void
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SVGUseElement::LookupHref()
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{
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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 = 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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mReferencedElementTracker.Reset(this, targetURI);
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}
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void
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SVGUseElement::TriggerReclone()
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{
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nsIDocument *doc = GetComposedDoc();
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if (!doc)
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return;
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nsIPresShell *presShell = doc->GetShell();
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if (!presShell)
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return;
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presShell->PostRecreateFramesFor(this);
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}
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void
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SVGUseElement::UnlinkSource()
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{
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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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// nsSVGElement methods
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/* virtual */ gfxMatrix
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SVGUseElement::PrependLocalTransformsTo(
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const gfxMatrix &aMatrix, SVGTransformTypes aWhich) const
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{
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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,
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mTransforms);
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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) {
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return childToUser * userToParent * aMatrix;
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}
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MOZ_ASSERT(aWhich == eChildToUserSpace, "Unknown TransformTypes");
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// The following may look broken because pre-multiplying our eChildToUserSpace
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// transform with another matrix without including our eUserSpaceToParent
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// transform between the two wouldn't make sense. We don't expect that to
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// ever happen though. We get here either when the identity matrix has been
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// passed because our caller just wants our eChildToUserSpace transform, or
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// when our eUserSpaceToParent transform has already been multiplied into the
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// matrix that our caller passes (such as when we're called from PaintSVG).
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return childToUser * aMatrix;
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}
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/* virtual */ bool
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SVGUseElement::HasValidDimensions() const
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{
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return (!mLengthAttributes[ATTR_WIDTH].IsExplicitlySet() ||
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mLengthAttributes[ATTR_WIDTH].GetAnimValInSpecifiedUnits() > 0) &&
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(!mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet() ||
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mLengthAttributes[ATTR_HEIGHT].GetAnimValInSpecifiedUnits() > 0);
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}
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nsSVGElement::LengthAttributesInfo
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SVGUseElement::GetLengthInfo()
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{
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return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
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ArrayLength(sLengthInfo));
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}
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nsSVGElement::StringAttributesInfo
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SVGUseElement::GetStringInfo()
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{
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return StringAttributesInfo(mStringAttributes, sStringInfo,
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ArrayLength(sStringInfo));
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}
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nsSVGUseFrame*
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SVGUseElement::GetFrame() const
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{
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nsIFrame* frame = GetPrimaryFrame();
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MOZ_ASSERT_IF(frame, frame->IsSVGUseFrame());
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return static_cast<nsSVGUseFrame*>(frame);
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}
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//----------------------------------------------------------------------
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// nsIContent methods
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NS_IMETHODIMP_(bool)
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SVGUseElement::IsAttributeMapped(const nsAtom* name) const
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{
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static const MappedAttributeEntry* const map[] = {
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sFEFloodMap,
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sFiltersMap,
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sFontSpecificationMap,
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sGradientStopMap,
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sLightingEffectsMap,
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sMarkersMap,
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sTextContentElementsMap,
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sViewportsMap
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};
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return FindAttributeDependence(name, map) ||
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SVGUseElementBase::IsAttributeMapped(name);
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}
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} // namespace dom
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} // namespace mozilla
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