1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef StyleInterpolation_h
6#define StyleInterpolation_h
7
8#include "core/CSSPropertyNames.h"
9#include "core/animation/Interpolation.h"
10
11namespace blink {
12
13class StyleResolverState;
14
15class StyleInterpolation : public Interpolation {
16public:
17    // 1) convert m_cachedValue into an X
18    // 2) shove X into StyleResolverState
19    // X can be:
20    // (1) a CSSValue (and applied via StyleBuilder::applyProperty)
21    // (2) an AnimatableValue (and applied via // AnimatedStyleBuilder::applyProperty)
22    // (3) a custom value that is inserted directly into the StyleResolverState.
23    virtual void apply(StyleResolverState&) const = 0;
24
25    virtual bool isStyleInterpolation() const OVERRIDE FINAL { return true; }
26
27    CSSPropertyID id() const { return m_id; }
28
29    virtual void trace(Visitor* visitor) OVERRIDE
30    {
31        Interpolation::trace(visitor);
32    }
33
34protected:
35    CSSPropertyID m_id;
36
37    StyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, CSSPropertyID id)
38        : Interpolation(start, end)
39        , m_id(id)
40    {
41    }
42};
43
44DEFINE_TYPE_CASTS(StyleInterpolation, Interpolation, value, value->isStyleInterpolation(), value.isStyleInterpolation());
45
46}
47
48#endif
49