Add TransitionKeyframe class for CSS Transition refactor

third_party/WebKit/Source/core/animation/TransitionKeyframe.h

+// Copyright 2017 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 TransitionKeyframe_h
+#define TransitionKeyframe_h
+
+#include "core/CoreExport.h"
+#include "core/animation/Keyframe.h"
+#include "core/animation/TypedInterpolationValue.h"
+#include "core/animation/animatable/AnimatableValue.h"
+
+namespace blink {
+
+class CORE_EXPORT TransitionKeyframe : public Keyframe {
+ public:
+  static PassRefPtr<TransitionKeyframe> create(const PropertyHandle& property) {
+    return adoptRef(new TransitionKeyframe(property));
+  }
+  void setValue(std::unique_ptr<TypedInterpolationValue> value) {
+    m_value = std::move(value);
+  }
+  void setCompositorValue(RefPtr<AnimatableValue>);
+  PropertyHandleSet properties() const final;
+
+  class PropertySpecificKeyframe : public Keyframe::PropertySpecificKeyframe {
+   public:
+    static PassRefPtr<PropertySpecificKeyframe> create(
+        double offset,
+        PassRefPtr<TimingFunction> easing,
+        EffectModel::CompositeOperation composite,
+        std::unique_ptr<TypedInterpolationValue> value,
+        RefPtr<AnimatableValue> compositorValue) {
+      return adoptRef(new PropertySpecificKeyframe(offset, std::move(easing),
+                                                   composite, std::move(value),
+                                                   std::move(compositorValue)));
+    }
+
+    PassRefPtr<AnimatableValue> getAnimatableValue() const final {
+      return m_compositorValue;
+    }
+
+    bool isNeutral() const final { return false; }
+    PassRefPtr<Keyframe::PropertySpecificKeyframe> neutralKeyframe(
+        double offset,
+        PassRefPtr<TimingFunction> easing) const final {
+      NOTREACHED();
+      return nullptr;
+    }
+    PassRefPtr<Interpolation> createInterpolation(
+        const PropertyHandle&,
+        const Keyframe::PropertySpecificKeyframe& other) const final;
+
+    bool isTransitionPropertySpecificKeyframe() const final { return true; }
+
+   private:
+    PropertySpecificKeyframe(double offset,
+                             PassRefPtr<TimingFunction> easing,
+                             EffectModel::CompositeOperation composite,
+                             std::unique_ptr<TypedInterpolationValue> value,
+                             RefPtr<AnimatableValue> compositorValue)
+        : Keyframe::PropertySpecificKeyframe(offset,
+                                             std::move(easing),
+                                             composite),
+          m_value(std::move(value)),
+          m_compositorValue(std::move(compositorValue)) {}
+
+    PassRefPtr<Keyframe::PropertySpecificKeyframe> cloneWithOffset(
+        double offset) const final {
+      return create(offset, m_easing, m_composite, m_value->clone(),
+                    m_compositorValue);
+    }
+
+    std::unique_ptr<TypedInterpolationValue> m_value;
+    RefPtr<AnimatableValue> m_compositorValue;
+  };
+
+ private:
+  TransitionKeyframe(const PropertyHandle& property) : m_property(property) {}
+
+  TransitionKeyframe(const TransitionKeyframe& copyFrom)
+      : Keyframe(copyFrom.m_offset, copyFrom.m_composite, copyFrom.m_easing),
+        m_property(copyFrom.m_property),
+        m_value(copyFrom.m_value->clone()),
+        m_compositorValue(copyFrom.m_compositorValue) {}
+
+  bool isTransitionKeyframe() const final { return true; }
+
+  PassRefPtr<Keyframe> clone() const final {
+    return adoptRef(new TransitionKeyframe(*this));
+  }
+
+  PassRefPtr<Keyframe::PropertySpecificKeyframe> createPropertySpecificKeyframe(
+      const PropertyHandle&) const final;
+
+  PropertyHandle m_property;
+  std::unique_ptr<TypedInterpolationValue> m_value;
+  RefPtr<AnimatableValue> m_compositorValue;
+};
+
+using TransitionPropertySpecificKeyframe =
+    TransitionKeyframe::PropertySpecificKeyframe;
+
+DEFINE_TYPE_CASTS(TransitionKeyframe,
+                  Keyframe,
+                  value,
+                  value->isTransitionKeyframe(),
+                  value.isTransitionKeyframe());
+DEFINE_TYPE_CASTS(TransitionPropertySpecificKeyframe,
+                  Keyframe::PropertySpecificKeyframe,
+                  value,
+                  value->isTransitionPropertySpecificKeyframe(),
+                  value.isTransitionPropertySpecificKeyframe());
+
+}  // namespace blink
+
+#endif