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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
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      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
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      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
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     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
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     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef AnimatableDouble_h
     32 #define AnimatableDouble_h
     33 
     34 #include "core/animation/animatable/AnimatableValue.h"
     35 
     36 namespace blink {
     37 
     38 class AnimatableDouble FINAL : public AnimatableValue {
     39 public:
     40     virtual ~AnimatableDouble() { }
     41 
     42     enum Constraint {
     43         Unconstrained,
     44         InterpolationIsNonContinuousWithZero,
     45     };
     46 
     47     static PassRefPtrWillBeRawPtr<AnimatableDouble> create(double number, Constraint constraint = Unconstrained)
     48     {
     49         return adoptRefWillBeNoop(new AnimatableDouble(number, constraint));
     50     }
     51 
     52     double toDouble() const { return m_number; }
     53 
     54     virtual void trace(Visitor* visitor) OVERRIDE { AnimatableValue::trace(visitor); }
     55 
     56 protected:
     57     virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
     58     virtual bool usesDefaultInterpolationWith(const AnimatableValue*) const OVERRIDE;
     59 
     60 private:
     61     AnimatableDouble(double number, Constraint constraint)
     62         : m_number(number)
     63         , m_constraint(constraint)
     64     {
     65     }
     66     virtual AnimatableType type() const OVERRIDE { return TypeDouble; }
     67     virtual bool equalTo(const AnimatableValue*) const OVERRIDE;
     68     virtual double distanceTo(const AnimatableValue*) const OVERRIDE;
     69 
     70     double m_number;
     71     Constraint m_constraint;
     72 };
     73 
     74 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableDouble, isDouble());
     75 
     76 } // namespace blink
     77 
     78 #endif // AnimatableDouble_h
     79