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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_SVG_SVG_ANIMATED_NUMBER_OPTIONAL_NUMBER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_SVG_SVG_ANIMATED_NUMBER_OPTIONAL_NUMBER_H_

#include "third_party/blink/renderer/core/svg/svg_animated_number.h"
#include "third_party/blink/renderer/core/svg/svg_number_optional_number.h"
#include "third_party/blink/renderer/platform/heap/handle.h"

namespace blink {

// SVG Spec: http://www.w3.org/TR/SVG11/types.html <number-optional-number>
// Unlike other SVGAnimated* class, this class is not exposed to Javascript
// directly, while DOM attribute and SMIL animations operate on this class.
// From Javascript, the two SVGAnimatedNumbers |firstNumber| and |secondNumber|
// are used.
// For example, see SVGFEDropShadowElement::stdDeviation{X,Y}()
class SVGAnimatedNumberOptionalNumber
    : public GarbageCollectedFinalized<SVGAnimatedNumberOptionalNumber>,
      public SVGAnimatedPropertyCommon<SVGNumberOptionalNumber> {
  USING_GARBAGE_COLLECTED_MIXIN(SVGAnimatedNumberOptionalNumber);

 public:
  static SVGAnimatedNumberOptionalNumber* Create(
      SVGElement* context_element,
      const QualifiedName& attribute_name,
      float initial_value) {
    return MakeGarbageCollected<SVGAnimatedNumberOptionalNumber>(
        context_element, attribute_name, initial_value);
  }

  SVGAnimatedNumberOptionalNumber(SVGElement* context_element,
                                  const QualifiedName& attribute_name,
                                  float initial_value);

  void SetAnimatedValue(SVGPropertyBase*) override;
  bool NeedsSynchronizeAttribute() const override;
  void AnimationEnded() override;

  SVGAnimatedNumber* FirstNumber() { return first_number_.Get(); }
  SVGAnimatedNumber* SecondNumber() { return second_number_.Get(); }

  void Trace(blink::Visitor*) override;

 protected:
  Member<SVGAnimatedNumber> first_number_;
  Member<SVGAnimatedNumber> second_number_;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_SVG_SVG_ANIMATED_NUMBER_OPTIONAL_NUMBER_H_