text: /*
   * Copyright (C) 2015 Apple 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:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. 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.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
   */
  
  #pragma once
  
  #if ENABLE(CSS_ANIMATIONS_LEVEL_2)
  
  #include "Length.h"
  #include <wtf/Ref.h>
  #include <wtf/RefCounted.h>
  #include <wtf/TypeCasts.h>
  
  namespace WebCore {
  
  class AnimationTrigger : public RefCounted<AnimationTrigger> {
  public:
      virtual Ref<AnimationTrigger> clone() const = 0;
  
      virtual ~AnimationTrigger() = default;
  
      enum class AnimationTriggerType { AutoAnimationTriggerType, ScrollAnimationTriggerType };
      AnimationTriggerType type() const { return m_type; }
  
      bool isAutoAnimationTrigger() const { return m_type == AnimationTriggerType::AutoAnimationTriggerType; }
      bool isScrollAnimationTrigger() const { return m_type == AnimationTriggerType::ScrollAnimationTriggerType; }
  
      virtual bool operator==(const AnimationTrigger& other) = 0;
  
  protected:
      AnimationTrigger(AnimationTriggerType type)
          : m_type(type)
      {
      }
  
      AnimationTriggerType m_type;
  };
  
  class AutoAnimationTrigger final : public AnimationTrigger {
  public:
      static Ref<AutoAnimationTrigger> create()
      {
          return adoptRef(*new AutoAnimationTrigger);
      }
  
      bool operator==(const AnimationTrigger& other) final
      {
          return other.isAutoAnimationTrigger();
      }
  
  private:
      AutoAnimationTrigger()
          : AnimationTrigger(AnimationTriggerType::AutoAnimationTriggerType)
      {
      }
  
      Ref<AnimationTrigger> clone() const final
      {
          return adoptRef(*new AutoAnimationTrigger);
      }
  };
  
  class ScrollAnimationTrigger final : public AnimationTrigger {
  public:
      static Ref<ScrollAnimationTrigger> create(Length startValue, Length endValue)
      {
          return adoptRef(*new ScrollAnimationTrigger(startValue, endValue));
      }
  
      bool operator==(const AnimationTrigger& other) final
      {
          if (!other.isScrollAnimationTrigger())
              return false;
  
          const ScrollAnimationTrigger* otherTrigger = static_cast<const ScrollAnimationTrigger*>(&other);
          return m_startValue == otherTrigger->m_startValue
              && m_endValue == otherTrigger->m_endValue
              && m_hasEndValue == otherTrigger->m_hasEndValue;
      }
  
      Length startValue() const { return m_startValue; }
  
      void setStartValue(Length value)
      {
          m_startValue = value;
      }
  
      Length endValue() const { return m_endValue; }
  
      void setEndValue(Length value)
      {
          m_endValue = value;
      }
  
      bool hasEndValue() const { return !m_endValue.isAuto() && m_endValue.value() > m_startValue.value(); }
  
  private:
      explicit ScrollAnimationTrigger(Length startValue, Length endValue)
          : AnimationTrigger(AnimationTriggerType::ScrollAnimationTriggerType)
          , m_startValue(startValue)
      {
          if (!endValue.isAuto() && endValue.value() > startValue.value())
              m_endValue = endValue;
      }
  
      Ref<AnimationTrigger> clone() const final
      {
          return adoptRef(*new ScrollAnimationTrigger(m_startValue, m_endValue));
      }
  
      Length m_startValue;
      Length m_endValue;
      bool m_hasEndValue;
  };
  
  } // namespace WebCore
  
  #define SPECIALIZE_TYPE_TRAITS_ANIMATION_TRIGGER(ToClassName, TriggerTest) \
  SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ToClassName) \
  static bool isType(const WebCore::AnimationTrigger& trigger) { return trigger.TriggerTest(); } \
  SPECIALIZE_TYPE_TRAITS_END()
  
  SPECIALIZE_TYPE_TRAITS_ANIMATION_TRIGGER(AutoAnimationTrigger, isAutoAnimationTrigger);
  SPECIALIZE_TYPE_TRAITS_ANIMATION_TRIGGER(ScrollAnimationTrigger, isScrollAnimationTrigger);
  
  #endif
  