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-rw-r--r--dom/svg/SVGUseElement.h178
1 files changed, 178 insertions, 0 deletions
diff --git a/dom/svg/SVGUseElement.h b/dom/svg/SVGUseElement.h
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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/. */
+
+#ifndef DOM_SVG_SVGUSEELEMENT_H_
+#define DOM_SVG_SVGUSEELEMENT_H_
+
+#include "mozilla/dom/FromParser.h"
+#include "mozilla/dom/IDTracker.h"
+#include "mozilla/dom/SVGGraphicsElement.h"
+#include "mozilla/RefPtr.h"
+#include "nsCOMPtr.h"
+#include "nsStubMutationObserver.h"
+#include "SVGAnimatedLength.h"
+#include "SVGAnimatedString.h"
+#include "nsTArray.h"
+
+class nsIContent;
+
+nsresult NS_NewSVGSVGElement(
+ nsIContent** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
+ mozilla::dom::FromParser aFromParser);
+nsresult NS_NewSVGUseElement(
+ nsIContent** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
+
+namespace mozilla {
+class Encoding;
+class SVGUseFrame;
+struct URLExtraData;
+
+namespace dom {
+
+using SVGUseElementBase = SVGGraphicsElement;
+
+class SVGUseElement final : public SVGUseElementBase,
+ public nsStubMutationObserver {
+ friend class mozilla::SVGUseFrame;
+
+ protected:
+ friend nsresult(::NS_NewSVGUseElement(
+ nsIContent** aResult,
+ already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo));
+ explicit SVGUseElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
+ virtual ~SVGUseElement();
+ JSObject* WrapNode(JSContext* cx, JS::Handle<JSObject*> aGivenProto) override;
+
+ public:
+ NS_IMPL_FROMNODE_WITH_TAG(SVGUseElement, kNameSpaceID_SVG, use)
+
+ nsresult BindToTree(BindContext&, nsINode& aParent) override;
+ void UnbindFromTree(bool aNullParent = true) override;
+
+ // interfaces:
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SVGUseElement, SVGUseElementBase)
+
+ NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
+ NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+ NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
+
+ // SVGElement specializations:
+ gfxMatrix PrependLocalTransformsTo(
+ const gfxMatrix& aMatrix,
+ SVGTransformTypes aWhich = eAllTransforms) const override;
+ bool HasValidDimensions() const override;
+
+ // nsIContent interface
+ nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
+ NS_IMETHOD_(bool) IsAttributeMapped(const nsAtom* aAttribute) const override;
+
+ static nsCSSPropertyID GetCSSPropertyIdForAttrEnum(uint8_t aAttrEnum);
+
+ // WebIDL
+ already_AddRefed<DOMSVGAnimatedString> Href();
+ already_AddRefed<DOMSVGAnimatedLength> X();
+ already_AddRefed<DOMSVGAnimatedLength> Y();
+ already_AddRefed<DOMSVGAnimatedLength> Width();
+ already_AddRefed<DOMSVGAnimatedLength> Height();
+
+ nsIURI* GetSourceDocURI();
+ const Encoding* GetSourceDocCharacterSet();
+ URLExtraData* GetContentURLData() const { return mContentURLData; }
+
+ // Updates the internal shadow tree to be an up-to-date clone of the
+ // referenced element.
+ void UpdateShadowTree();
+
+ // Shared code between AfterSetAttr and SVGUseFrame::AttributeChanged.
+ //
+ // This is needed because SMIL doesn't go through AfterSetAttr unfortunately.
+ void ProcessAttributeChange(int32_t aNamespaceID, nsAtom* aAttribute);
+
+ void AfterSetAttr(int32_t aNamespaceID, nsAtom* aAttribute,
+ const nsAttrValue* aValue, const nsAttrValue* aOldValue,
+ nsIPrincipal* aSubjectPrincipal, bool aNotify) final;
+
+ protected:
+ // Information from walking our ancestors and a given target.
+ enum class ScanResult {
+ // Nothing that should stop us from rendering the shadow tree.
+ Ok,
+ // We're never going to be displayed, so no point in updating the shadow
+ // tree.
+ //
+ // However if we're referenced from another tree that tree may need to be
+ // rendered.
+ Invisible,
+ // We're a cyclic reference to either an ancestor or another shadow tree. We
+ // shouldn't render this <use> element.
+ CyclicReference,
+ // We're too deep in our clone chain, we shouldn't be rendered.
+ TooDeep,
+ };
+ ScanResult ScanAncestors(const Element& aTarget) const;
+ ScanResult ScanAncestorsInternal(const Element& aTarget,
+ uint32_t& aCount) const;
+
+ /**
+ * Helper that provides a reference to the element with the ID that is
+ * referenced by the 'use' element's 'href' attribute, and that will update
+ * the 'use' element if the element that that ID identifies changes to a
+ * different element (or none).
+ */
+ class ElementTracker final : public IDTracker {
+ public:
+ explicit ElementTracker(SVGUseElement* aOwningUseElement)
+ : mOwningUseElement(aOwningUseElement) {}
+
+ private:
+ void ElementChanged(Element* aFrom, Element* aTo) override {
+ IDTracker::ElementChanged(aFrom, aTo);
+ if (aFrom) {
+ aFrom->RemoveMutationObserver(mOwningUseElement);
+ }
+ mOwningUseElement->TriggerReclone();
+ }
+
+ SVGUseElement* mOwningUseElement;
+ };
+
+ SVGUseFrame* GetFrame() const;
+
+ LengthAttributesInfo GetLengthInfo() override;
+ StringAttributesInfo GetStringInfo() override;
+
+ /**
+ * Returns true if our width and height should be used, or false if they
+ * should be ignored. As per the spec, this depends on the type of the
+ * element that we're referencing.
+ */
+ bool OurWidthAndHeightAreUsed() const;
+ void SyncWidthOrHeight(nsAtom* aName);
+ void LookupHref();
+ void TriggerReclone();
+ void UnlinkSource();
+
+ enum { ATTR_X, ATTR_Y, ATTR_WIDTH, ATTR_HEIGHT };
+ SVGAnimatedLength mLengthAttributes[4];
+ static LengthInfo sLengthInfo[4];
+
+ enum { HREF, XLINK_HREF };
+ SVGAnimatedString mStringAttributes[2];
+ static StringInfo sStringInfo[2];
+
+ RefPtr<SVGUseElement> mOriginal; // if we've been cloned, our "real" copy
+ ElementTracker mReferencedElementTracker;
+ RefPtr<URLExtraData> mContentURLData; // URL data for its anonymous content
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // DOM_SVG_SVGUSEELEMENT_H_