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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      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
     13  * distribution.
     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.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     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/AnimatableValue.h"
     35 #include "core/css/CSSValue.h"
     36 
     37 namespace WebCore {
     38 
     39 class AnimatableDouble : public AnimatableValue {
     40 public:
     41     virtual ~AnimatableDouble() { }
     42 
     43     enum Constraint {
     44         Unconstrained,
     45         InterpolationIsNonContinuousWithZero,
     46     };
     47 
     48     static PassRefPtr<AnimatableDouble> create(double number, Constraint constraint = Unconstrained)
     49     {
     50         return adoptRef(new AnimatableDouble(number, constraint));
     51     }
     52 
     53     PassRefPtr<CSSValue> toCSSValue() const;
     54     double toDouble() const { return m_number; }
     55 
     56 protected:
     57     virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
     58     virtual PassRefPtr<AnimatableValue> addWith(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 
     69     double m_number;
     70     Constraint m_constraint;
     71 };
     72 
     73 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableDouble, isDouble());
     74 
     75 } // namespace WebCore
     76 
     77 #endif // AnimatableDouble_h
     78