Add support for 'href' (w/o XLink NS) for various SVG elements

third_party/WebKit/Source/core/svg/SVGAnimatedHref.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SVGAnimatedHref_h
+#define SVGAnimatedHref_h
+
+#include "core/svg/SVGAnimatedString.h"
+
+namespace blink {
+
+// This is an "access wrapper" for the 'href' attribute. It holds one object
+// for 'href' in the null/default NS and one for 'href' in the XLink NS. The
+// internal objects are the ones added to an SVGElement's property map and
+// hence any updates/synchronization/etc via the "attribute DOM" (setAttribute
+// and friends) will operate on the internal objects, while users of 'href'
+// will be using this interface (which essentially just selects one of the
+// internal objects and forwards the operation to it.)
+class SVGAnimatedHref final : public SVGAnimatedString {
+public:
+    static PassRefPtrWillBeRawPtr<SVGAnimatedHref> create(SVGElement* contextElement);
+
+    SVGString* baseValue() { return backingHref()->baseValue(); }
+    SVGString* currentValue() { return backingHref()->currentValue(); }
+    const SVGString* currentValue() const { return backingHref()->currentValue(); }
+
+    // None of the below should be called on this interface.
+    SVGPropertyBase* currentValueBase() override;
+    const SVGPropertyBase& baseValueBase() const override;
+    bool isAnimating() const override;
+    PassRefPtrWillBeRawPtr<SVGPropertyBase> createAnimatedValue() override;
+    void setAnimatedValue(PassRefPtrWillBeRawPtr<SVGPropertyBase>) override;
+    void animationEnded() override;
+    SVGParsingError setBaseValueAsString(const String&) override;
+    bool needsSynchronizeAttribute() override;
+    void synchronizeAttribute() override;
+
+    String baseVal() override;
+    void setBaseVal(const String&, ExceptionState&) override;
+    String animVal() override;
+
+    bool isSpecified() const { return m_href->isSpecified() || m_xlinkHref->isSpecified(); }
+
+    static bool isKnownAttribute(const QualifiedName&);
+    void addToPropertyMap(SVGElement*);
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    explicit SVGAnimatedHref(SVGElement* contextElement);
+
+    SVGAnimatedString* backingHref() const;
+
+    RefPtrWillBeMember<SVGAnimatedString> m_href;
+    RefPtrWillBeMember<SVGAnimatedString> m_xlinkHref;
+};
+
+} // namespace blink
+
+#endif // SVGAnimatedHref_h