Animation: Add template for ListStyleInterpolation

Source/core/animation/ListStyleInterpolation.h

Index: Source/core/animation/ListStyleInterpolation.h
diff --git a/Source/core/animation/ListStyleInterpolation.h b/Source/core/animation/ListStyleInterpolation.h
new file mode 100644
index 0000000000000000000000000000000000000000..f4d5ffb82fb706a8162aabb84257100afa93d1a3
--- /dev/null
+++ b/Source/core/animation/ListStyleInterpolation.h
@@ -0,0 +1,138 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.

[samli, 2015/01/23 03:23:36]

2015

[evemj (not active), 2015/01/28 00:41:13]

Done.

+// 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"
+#include "platform/Length.h"
+

[jadeg, 2015/01/21 05:36:34]

Do you need this platform/Length.h?

[evemj (not active), 2015/01/28 00:41:13]

Done.

+namespace blink {
+
+template<typename T, typename NI>

[samli, 2015/01/23 03:23:36]

template <typename..

+class ListStyleInterpolationImpl : public StyleInterpolation {
+public:
+    static bool canCreateFrom(const CSSValue& value)
+    {
+        return value.isValueList();
+    }
+
+    static PassRefPtrWillBeRawPtr<ListStyleInterpolationImpl<T, NI>> create(const CSSValue& start, const CSSValue& end, CSSPropertyID id, InterpolationRange range = RangeAll)

[jadeg, 2015/01/21 05:36:34]

This seems like a strange way to assign a value?

[samli, 2015/01/23 03:23:36]

Seems fine.

[samli, 2015/01/23 03:23:36]

<T, NI> >
use git cl format

[Timothy Loh, 2015/01/27 03:36:53]

Using >> is fine nowadays

+    {
+        Vector<typename T::NonInterpolableType> nonInterpolableData;
+        Vector<typename T::NonInterpolableType> nonInterpolableDataToo;

[samli, 2015/01/23 03:23:36]

Rename it to startNonInterpolableData, endNonInterpolableData

[evemj (not active), 2015/01/28 00:41:13]

Done.

+
+        for (size_t i = 0; i < toCSSValueList(start).length(); i++) {
+            if (!T::canCreateFrom(*toCSSValueList(start).item(i), *toCSSValueList(end).item(i))) {

[jadeg, 2015/01/21 05:36:34]

Can you put a , in an if statement?

[samli, 2015/01/23 03:23:36]

It's not in the if statement.

+                return nullptr;
+            }
+        }
+        return adoptRefWillBeNoop(new ListStyleInterpolationImpl<T, NI>(listToInterpolableValue(start, nonInterpolableData), listToInterpolableValue(end, nonInterpolableDataToo), id, nonInterpolableData, 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);
+        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,  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)));
+        }

[samli, 2015/01/23 03:23:36]

For consistency with below, remove braces.

[evemj (not active), 2015/01/28 00:41:13]

Done.

+        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;

[jadeg, 2015/01/21 05:36:34]

Is there a way to make one of these classes inherit from the other so that you
dont have to do this twice?

+
+};
+
+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()) {
+            if (toCSSValueList(start).length() == toCSSValueList(end).length()) {

[samli, 2015/01/23 03:23:36]

Combine into one if statement

[evemj (not active), 2015/01/28 00:41:13]

Done.

+                return ListStyleInterpolationImpl<T, typename T::NonInterpolableType>::create(start, end, id, range);
+            }
+        }
+        return nullptr;
+    }
+};
+
+} // namespace blink
+
+#endif // ListStyleInterpolation_h

[jadeg, 2015/01/21 05:36:34]

Need newline at end (pedantic i know)

[evemj (not active), 2015/01/28 00:41:13]

I think the codereview page doesn't show the new lines but they're there