Web Animations: Introduce String based KeyframeEffectModel

Source/core/animation/StringKeyframe.h

+// Copyright 2014 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 StringKeyframe_h
+#define StringKeyframe_h
+
+#include "core/animation/AnimatableValue.h"
+#include "core/animation/Keyframe.h"
+
+namespace WebCore {
+
+class StringKeyframe : public Keyframe {
+public:
+    static PassRefPtr<StringKeyframe> create() { return adoptRef(new StringKeyframe); }
+    void setPropertyValue(CSSPropertyID property, const String& value)
+    {
+        m_propertyValues.add(property, value);
+    }
+    void clearPropertyValue(CSSPropertyID property) { m_propertyValues.remove(property); }
+    String propertyValue(CSSPropertyID property) const
+    {
+        ASSERT(m_propertyValues.contains(property));
+        return m_propertyValues.get(property);
+    }
+    virtual PropertySet properties() const OVERRIDE;
+
+    class PropertySpecificKeyframe : public Keyframe::PropertySpecificKeyframe {
+    public:
+        PropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, const String& value, AnimationEffect::CompositeOperation);
+
+        const String& value() const { return m_value; }
+
+        virtual PassOwnPtr<Keyframe::PropertySpecificKeyframe> neutralKeyframe(double offset, PassRefPtr<TimingFunction> easing) const OVERRIDE FINAL;
+        virtual PassRefPtr<Interpolation> createInterpolation(CSSPropertyID, WebCore::Keyframe::PropertySpecificKeyframe* end) const OVERRIDE FINAL;
+    private:
+        PropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, const String& value);
+
+        virtual PassOwnPtr<Keyframe::PropertySpecificKeyframe> cloneWithOffset(double offset) const;
+        virtual bool isStringPropertySpecificKeyframe() const OVERRIDE { return true; }
+
+        String m_value;
+    };
+
+private:
+    StringKeyframe() { }
+
+    StringKeyframe(const StringKeyframe& copyFrom);
+
+    virtual PassRefPtrWillBeRawPtr<Keyframe> clone() const OVERRIDE;
+    virtual PassOwnPtr<Keyframe::PropertySpecificKeyframe> createPropertySpecificKeyframe(CSSPropertyID) const OVERRIDE;
+
+    virtual bool isStringKeyframe() const OVERRIDE { return true; }
+
+    typedef HashMap<CSSPropertyID, String> PropertyValueMap;
+    PropertyValueMap m_propertyValues;
+};
+
+typedef StringKeyframe::PropertySpecificKeyframe StringPropertySpecificKeyframe;
+
+}
+
+#endif