| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef AnimatableValue_h |
| #define AnimatableValue_h |
| |
| #include "core/css/CSSValue.h" |
| #include "wtf/RefCounted.h" |
| |
| namespace WebCore { |
| |
| class CSSValue; |
| |
| class AnimatableValue : public RefCounted<AnimatableValue> { |
| public: |
| virtual ~AnimatableValue() { } |
| static PassRefPtr<AnimatableValue> create(CSSValue*); |
| virtual PassRefPtr<CSSValue> toCSSValue() const = 0; |
| |
| static const AnimatableValue* neutralValue(); |
| virtual bool isNeutral() const { return false; } |
| |
| static PassRefPtr<AnimatableValue> interpolate(const AnimatableValue*, const AnimatableValue*, double fraction); |
| // For noncommutative values read add(A, B) to mean the value A with B composed onto it. |
| static PassRefPtr<AnimatableValue> add(const AnimatableValue*, const AnimatableValue*); |
| |
| protected: |
| enum AnimatableType { |
| TypeNeutral, |
| TypeNumber, |
| TypeUnknown, |
| }; |
| |
| AnimatableValue(AnimatableType type) : m_type(type) { } |
| |
| bool isSameType(const AnimatableValue* value) const |
| { |
| ASSERT(value); |
| return value->m_type == m_type; |
| } |
| |
| virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const = 0; |
| static PassRefPtr<AnimatableValue> defaultInterpolateTo(const AnimatableValue* left, const AnimatableValue* right, double fraction) { return takeConstRef((fraction < 0.5) ? left : right); } |
| |
| // For noncommutative values read A->addWith(B) to mean the value A with B composed onto it. |
| virtual PassRefPtr<AnimatableValue> addWith(const AnimatableValue*) const = 0; |
| static PassRefPtr<AnimatableValue> defaultAddWith(const AnimatableValue* left, const AnimatableValue* right) { return takeConstRef(right); } |
| |
| template <class T> |
| static PassRefPtr<T> takeConstRef(const T* value) { return PassRefPtr<T>(const_cast<T*>(value)); } |
| |
| AnimatableType m_type; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // AnimatableValue_h |