Animation: Add template for ListStyleInterpolation

Source/core/animation/ListStyleInterpolation.h

+// Copyright 2015 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 ListStyleInterpolation_h
+#define ListStyleInterpolation_h
+
+#include "core/animation/StyleInterpolation.h"
+#include "core/css/CSSPrimitiveValue.h"
+#include "core/css/CSSValueList.h"
+#include "core/css/resolver/StyleBuilder.h"
+
+namespace blink {
+
+template<typename T, typename NI>

[shans, 2015/01/29 03:13:11]

the 'NI' parameter doesn't appear to be used. It looks like we can remove the
Impl indirection and just use T:NonInterpolableType directly in
ListStyleInterpolation?

[evemj (not active), 2015/02/02 03:56:01]

Need the NI parameter so that template can be specialized on void

+class ListStyleInterpolationImpl : public StyleInterpolation {
+public:
+    static PassRefPtrWillBeRawPtr<ListStyleInterpolationImpl<T, NI>> create(const CSSValue& start, const CSSValue& end, CSSPropertyID id, InterpolationRange range = RangeAll)
+    {
+        Vector<typename T::NonInterpolableType> startNonInterpolableData;
+        Vector<typename T::NonInterpolableType> endNonInterpolableData;
+
+        const CSSValueList& startList = toCSSValueList(start);
+        const CSSValueList& endList = toCSSValueList(end);
+
+        for (size_t i = 0; i < toCSSValueList(start).length(); i++) {
+            if (!T::canCreateFrom(*startList.item(i), *endList.item(i))) {
+                return nullptr;
+            }
+        }
+        return adoptRefWillBeNoop(new ListStyleInterpolationImpl<T, NI>(listToInterpolableValue(start, startNonInterpolableData), listToInterpolableValue(end, endNonInterpolableData), id, startNonInterpolableData, range));
+    }
+
+    virtual void apply(StyleResolverState& state) const override
+    {
+        StyleBuilder::applyProperty(m_id, state, interpolableValueToList(m_cachedValue.get(), m_nonInterpolableData, m_range).get());
+    }
+
+private:
+    ListStyleInterpolationImpl(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, CSSPropertyID id, Vector<typename T::NonInterpolableType> nonInterpolableData, InterpolationRange range = RangeAll)
+        : StyleInterpolation(start, end, id), m_range(range), m_nonInterpolableData(nonInterpolableData)
+    {
+    }
+
+    InterpolationRange m_range;
+
+    Vector<typename T::NonInterpolableType> m_nonInterpolableData;
+
+    static PassOwnPtrWillBeRawPtr<InterpolableValue> listToInterpolableValue(const CSSValue& value, Vector<typename T::NonInterpolableType> &nonInterpolableData)
+    {
+        const CSSValueList& listValue = toCSSValueList(value);
+        nonInterpolableData.reserveCapacity(listValue.length());
+        OwnPtrWillBeRawPtr<InterpolableList> result = InterpolableList::create(listValue.length());
+        typename T::NonInterpolableType elementData;
+        for (size_t i = 0; i < listValue.length(); i++) {
+            result->set(i, T::toInterpolableValue(*listValue.item(i), elementData));
+            nonInterpolableData.append(elementData);
+        }
+        return result.release();
+    }
+
+    static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToList(InterpolableValue* value,  const Vector<typename T::NonInterpolableType>& nonInterpolableData, InterpolationRange range = RangeAll)
+    {
+        InterpolableList* listValue = toInterpolableList(value);
+        RefPtrWillBeRawPtr<CSSValueList> result = CSSValueList::createCommaSeparated();
+
+        for (size_t i = 0; i < listValue->length(); i++)
+            result->append(T::fromInterpolableValue(*(listValue->get(i)), nonInterpolableData[i], range));
+        return result.release();
+    }
+
+    friend class ListStyleInterpolationTest;
+};
+
+template<typename T>
+class ListStyleInterpolationImpl<T, void> : public StyleInterpolation {
+public:
+    static PassRefPtrWillBeRawPtr<ListStyleInterpolationImpl<T, void>> create(const CSSValue& start, const CSSValue& end, CSSPropertyID id, InterpolationRange range = RangeAll)
+    {
+        return adoptRefWillBeNoop(new ListStyleInterpolationImpl<T, void>(listToInterpolableValue(start), listToInterpolableValue(end), id, range));
+    }
+
+private:
+    ListStyleInterpolationImpl(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, CSSPropertyID id, InterpolationRange range = RangeAll)
+        : StyleInterpolation(start, end, id), m_range(range)
+    {
+    }
+
+    InterpolationRange m_range;
+
+    static PassOwnPtrWillBeRawPtr<InterpolableValue> listToInterpolableValue(const CSSValue& value)
+    {
+        const CSSValueList& listValue = toCSSValueList(value);
+        OwnPtrWillBeRawPtr<InterpolableList> result = InterpolableList::create(listValue.length());
+        for (size_t i = 0; i < listValue.length(); i++)
+            result->set(i, T::toInterpolableValue(*listValue.item(i)));
+        return result.release();
+    }
+
+    static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToList(InterpolableValue* value, InterpolationRange range = RangeAll)
+    {
+        InterpolableList* listValue = toInterpolableList(value);
+        RefPtrWillBeRawPtr<CSSValueList> result = CSSValueList::createCommaSeparated();
+
+        for (size_t i = 0; i < listValue->length(); i++)
+            result->append(T::fromInterpolableValue(*(listValue->get(i)), range));
+        return result.release();
+    }
+
+    virtual void apply(StyleResolverState& state) const override
+    {
+        StyleBuilder::applyProperty(m_id, state, interpolableValueToList(m_cachedValue.get(), m_range).get());
+    }
+
+    friend class ListStyleInterpolationTest;
+
+};
+
+template<typename T>
+class ListStyleInterpolation {
+public:
+    static PassRefPtrWillBeRawPtr<ListStyleInterpolationImpl<T, typename T::NonInterpolableType>>  maybeCreateFromList(const CSSValue& start, const CSSValue& end, CSSPropertyID id, InterpolationRange range = RangeAll)
+    {
+        if (start.isValueList() && end.isValueList() && toCSSValueList(start).length() == toCSSValueList(end).length())
+            return ListStyleInterpolationImpl<T, typename T::NonInterpolableType>::create(start, end, id, range);
+        return nullptr;
+    }
+};
+
+} // namespace blink
+
+#endif // ListStyleInterpolation_h