зеркало из https://github.com/mozilla/gecko-dev.git
121 строка
4.3 KiB
C++
121 строка
4.3 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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#ifndef mozilla_dom_SVGMPathElement_h
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#define mozilla_dom_SVGMPathElement_h
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#include "mozilla/dom/IDTracker.h"
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#include "mozilla/dom/SVGElement.h"
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#include "nsStubMutationObserver.h"
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#include "SVGAnimatedString.h"
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nsresult NS_NewSVGMPathElement(
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nsIContent** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
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namespace mozilla {
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namespace dom {
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class SVGPathElement;
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typedef SVGElement SVGMPathElementBase;
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class SVGMPathElement final : public SVGMPathElementBase,
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public nsStubMutationObserver {
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protected:
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friend nsresult(::NS_NewSVGMPathElement(
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nsIContent** aResult,
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo));
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explicit SVGMPathElement(
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
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~SVGMPathElement();
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virtual JSObject* WrapNode(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) override;
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public:
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// interfaces:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SVGMPathElement, SVGMPathElementBase)
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NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
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// nsIContent interface
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virtual nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
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virtual nsresult BindToTree(BindContext&, nsINode& aParent) override;
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virtual void UnbindFromTree(bool aNullParent) override;
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// Element specializations
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virtual bool ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
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const nsAString& aValue,
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nsIPrincipal* aMaybeScriptedPrincipal,
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nsAttrValue& aResult) override;
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virtual nsresult AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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nsIPrincipal* aMaybeScriptedPrincipal,
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bool aNotify) override;
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// Public helper method: If our xlink:href attribute links to a <path>
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// element, this method returns a pointer to that element. Otherwise,
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// this returns nullptr.
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SVGPathElement* GetReferencedPath();
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// WebIDL
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already_AddRefed<DOMSVGAnimatedString> Href();
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protected:
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/**
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* Helper that provides a reference to the 'path' element with the ID that is
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* referenced by the 'mpath' element's 'href' attribute, and that will
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* invalidate the parent of the 'mpath' and update mutation observers to the
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* new path element if the element that that ID identifies changes to a
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* different element (or none).
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*/
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class PathElementTracker final : public IDTracker {
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public:
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explicit PathElementTracker(SVGMPathElement* aMpathElement)
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: mMpathElement(aMpathElement) {}
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protected:
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// We need to be notified when target changes, in order to request a sample
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// (which will clear animation effects that used the old target-path
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// and recompute the animation effects using the new target-path).
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virtual void ElementChanged(Element* aFrom, Element* aTo) override {
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IDTracker::ElementChanged(aFrom, aTo);
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if (aFrom) {
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aFrom->RemoveMutationObserver(mMpathElement);
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}
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if (aTo) {
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aTo->AddMutationObserver(mMpathElement);
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}
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mMpathElement->NotifyParentOfMpathChange(mMpathElement->GetParent());
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}
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// We need to override IsPersistent to get persistent tracking (beyond the
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// first time the target changes)
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virtual bool IsPersistent() override { return true; }
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private:
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SVGMPathElement* const mMpathElement;
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};
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virtual StringAttributesInfo GetStringInfo() override;
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void UpdateHrefTarget(nsIContent* aParent, const nsAString& aHrefStr);
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void UnlinkHrefTarget(bool aNotifyParent);
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void NotifyParentOfMpathChange(nsIContent* aParent);
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enum { HREF, XLINK_HREF };
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SVGAnimatedString mStringAttributes[2];
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static StringInfo sStringInfo[2];
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PathElementTracker mPathTracker;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_SVGMPathElement_h
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