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
+    {
+        // This is not used in time-critical code, so we probably don't need to
+        // worry about caching this result.
+        PropertySet properties;
+        for (typename PropertyValueMap::const_iterator iter = m_propertyValues.begin(); iter != m_propertyValues.end(); ++iter)
+            properties.add(*iter.keys());
+        return properties;
+    }
+
+    class PropertySpecificKeyframe : public Keyframe::PropertySpecificKeyframe {
+    public:
+        PropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, const String& value, AnimationEffect::CompositeOperation op)
+            : Keyframe::PropertySpecificKeyframe(offset, easing, op)
+            , m_value(value)
+        {
+        }
+
+        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)
+            : Keyframe::PropertySpecificKeyframe(offset, easing, AnimationEffect::CompositeReplace)
+            , m_value(value)
+        {
+            ASSERT(!isNull(m_offset));
+        }
+
+        virtual PassOwnPtr<Keyframe::PropertySpecificKeyframe> cloneWithOffset(double offset) const
+        {
+            Keyframe::PropertySpecificKeyframe *theClone = new PropertySpecificKeyframe(offset, m_easing, m_value);
+            return adoptPtr(theClone);
+        }
+        virtual bool isStringPropertySpecificKeyframe() const OVERRIDE { return true; }
+
+        String m_value;
+    };
+
+private:
+    StringKeyframe()
+        : Keyframe()
+    {
+    }
+    StringKeyframe(const StringKeyframe& copyFrom)
+        : Keyframe(copyFrom.m_offset, copyFrom.m_composite, copyFrom.m_easing)
+    {
+        for (typename PropertyValueMap::const_iterator iter = copyFrom.m_propertyValues.begin(); iter != copyFrom.m_propertyValues.end(); ++iter)
+            setPropertyValue(iter->key, iter->value);
+    }
+
+    virtual PassRefPtrWillBeRawPtr<Keyframe> clone() const OVERRIDE
+    {
+        return adoptRefWillBeNoop(new StringKeyframe(*this));
+    }
+    virtual PassOwnPtr<Keyframe::PropertySpecificKeyframe> createPropertySpecificKeyframe(CSSPropertyID property) const
+    {
+        return adoptPtr(new PropertySpecificKeyframe(offset(), easing(), propertyValue(property), composite()));
+    }
+    virtual bool isStringKeyframe() const OVERRIDE { return true; }
+
+    typedef HashMap<CSSPropertyID, String> PropertyValueMap;
+    PropertyValueMap m_propertyValues;
+};
+
+typedef StringKeyframe::PropertySpecificKeyframe StringPropertySpecificKeyframe;
+
+}
+
+#endif