third_party/WebKit/Source/core/animation/CSSPositionInterpolationType.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 CSSPositionInterpolationType_h
#define CSSPositionInterpolationType_h

#include "core/animation/CSSLengthListInterpolationType.h"

#include "core/animation/CSSPositionAxisListInterpolationType.h"
#include "core/animation/ListInterpolationFunctions.h"
#include "core/css/CSSPrimitiveValue.h"
#include "core/css/CSSValuePair.h"

namespace blink {

class CSSPositionInterpolationType : public CSSLengthListInterpolationType {
 public:
  CSSPositionInterpolationType(PropertyHandle property)
      : CSSLengthListInterpolationType(property) {}

 private:
  InterpolationValue maybeConvertValue(const CSSValue& value,
                                       const StyleResolverState&,
                                       ConversionCheckers&) const final {
    if (!value.isValuePair()) {
      return nullptr;
    }
    const CSSValuePair& pair = toCSSValuePair(value);
    return ListInterpolationFunctions::createList(2, [&pair](size_t index) {
      return CSSPositionAxisListInterpolationType::convertPositionAxisCSSValue(
          index == 0 ? pair.first() : pair.second());
    });
  }
};

}  // namespace blink

#endif  // CSSPositionInterpolationType_h