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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_SVGANIMATEDPOINTLIST_H_
+#define DOM_SVG_SVGANIMATEDPOINTLIST_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/SMILAttr.h"
+#include "mozilla/UniquePtr.h"
+#include "SVGPointList.h"
+
+namespace mozilla {
+
+class SMILValue;
+
+namespace dom {
+class DOMSVGPoint;
+class DOMSVGPointList;
+class SVGAnimationElement;
+class SVGElement;
+} // namespace dom
+
+/**
+ * Class SVGAnimatedPointList
+ *
+ * Despite the fact that no SVGAnimatedPointList interface or objects exist
+ * in the SVG specification (unlike e.g. SVGAnimated*Length*List), we
+ * nevertheless have this internal class. (Note that there is an
+ * SVGAnimatedPoints interface, but that's quite different to
+ * SVGAnimatedLengthList since it is inherited by elements, as opposed to
+ * elements having members of that type.) The reason that we have this class is
+ * to provide a single locked down point of entry to the SVGPointList objects,
+ * which helps ensure that the DOM wrappers for SVGPointList objects' are
+ * always kept in sync. This is vitally important (see the comment in
+ * DOMSVGPointList::InternalListWillChangeTo) and frees consumers from having
+ * to know or worry about wrappers (or forget about them!) for the most part.
+ */
+class SVGAnimatedPointList {
+ // friends so that they can get write access to mBaseVal and mAnimVal
+ friend class dom::DOMSVGPoint;
+ friend class dom::DOMSVGPointList;
+
+ public:
+ SVGAnimatedPointList() = default;
+
+ SVGAnimatedPointList& operator=(const SVGAnimatedPointList& aOther) {
+ mBaseVal = aOther.mBaseVal;
+ if (aOther.mAnimVal) {
+ mAnimVal = MakeUnique<SVGPointList>(*aOther.mAnimVal);
+ }
+ return *this;
+ }
+
+ /**
+ * Because it's so important that mBaseVal and its DOMSVGPointList wrapper
+ * (if any) be kept in sync (see the comment in
+ * DOMSVGPointList::InternalListWillChangeTo), this method returns a const
+ * reference. Only our friend classes may get mutable references to mBaseVal.
+ */
+ const SVGPointList& GetBaseValue() const { return mBaseVal; }
+
+ nsresult SetBaseValueString(const nsAString& aValue);
+
+ void ClearBaseValue();
+
+ /**
+ * const! See comment for GetBaseValue!
+ */
+ const SVGPointList& GetAnimValue() const {
+ return mAnimVal ? *mAnimVal : mBaseVal;
+ }
+
+ nsresult SetAnimValue(const SVGPointList& aNewAnimValue,
+ dom::SVGElement* aElement);
+
+ void ClearAnimValue(dom::SVGElement* aElement);
+
+ /**
+ * Needed for correct DOM wrapper construction since GetAnimValue may
+ * actually return the baseVal!
+ */
+ void* GetBaseValKey() const { return (void*)&mBaseVal; }
+ void* GetAnimValKey() const { return (void*)&mAnimVal; }
+
+ bool IsAnimating() const { return !!mAnimVal; }
+
+ UniquePtr<SMILAttr> ToSMILAttr(dom::SVGElement* aElement);
+
+ private:
+ // mAnimVal is a pointer to allow us to determine if we're being animated or
+ // not. Making it a non-pointer member and using mAnimVal.IsEmpty() to check
+ // if we're animating is not an option, since that would break animation *to*
+ // the empty string (<set to="">).
+
+ SVGPointList mBaseVal;
+ UniquePtr<SVGPointList> mAnimVal;
+
+ struct SMILAnimatedPointList : public SMILAttr {
+ public:
+ SMILAnimatedPointList(SVGAnimatedPointList* aVal, dom::SVGElement* aElement)
+ : mVal(aVal), mElement(aElement) {}
+
+ // These will stay alive because a SMILAttr only lives as long
+ // as the Compositing step, and DOM elements don't get a chance to
+ // die during that.
+ SVGAnimatedPointList* mVal;
+ dom::SVGElement* mElement;
+
+ // SMILAttr methods
+ nsresult ValueFromString(const nsAString& aStr,
+ const dom::SVGAnimationElement* aSrcElement,
+ SMILValue& aValue,
+ bool& aPreventCachingOfSandwich) const override;
+ SMILValue GetBaseValue() const override;
+ void ClearAnimValue() override;
+ nsresult SetAnimValue(const SMILValue& aValue) override;
+ };
+};
+
+} // namespace mozilla
+
+#endif // DOM_SVG_SVGANIMATEDPOINTLIST_H_