DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (56e7b9127e89)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_css_AnimationCommon_h
#define mozilla_css_AnimationCommon_h

#include "mozilla/AnimationCollection.h"
#include "mozilla/LinkedList.h"
#include "mozilla/dom/Animation.h"
#include "mozilla/Attributes.h" // For MOZ_NON_OWNING_REF
#include "mozilla/Assertions.h"
#include "mozilla/TimingParams.h"
#include "mozilla/dom/Nullable.h"
#include "nsContentUtils.h"

class nsPresContext;

namespace mozilla {
enum class CSSPseudoElementType : uint8_t;

namespace dom {
class Element;
}

template <class AnimationType>
class CommonAnimationManager {
public:
  explicit CommonAnimationManager(nsPresContext *aPresContext)
    : mPresContext(aPresContext)
  {
  }

  // NOTE:  This can return null after Disconnect().
  nsPresContext* PresContext() const { return mPresContext; }

  /**
   * Notify the manager that the pres context is going away.
   */
  void Disconnect()
  {
    // Content nodes might outlive the transition or animation manager.
    RemoveAllElementCollections();

    mPresContext = nullptr;
  }

  /**
   * Stop animations on the element. This method takes the real element
   * rather than the element for the generated content for animations on
   * ::before and ::after.
   */
  void StopAnimationsForElement(dom::Element* aElement,
                                CSSPseudoElementType aPseudoType)
  {
    MOZ_ASSERT(aElement);
    AnimationCollection<AnimationType>* collection =
      AnimationCollection<AnimationType>::GetAnimationCollection(aElement,
                                                                 aPseudoType);
    if (!collection) {
      return;
    }

    nsAutoAnimationMutationBatch mb(aElement->OwnerDoc());
    collection->Destroy();
  }

protected:
  virtual ~CommonAnimationManager()
  {
    MOZ_ASSERT(!mPresContext, "Disconnect should have been called");
  }

  void AddElementCollection(AnimationCollection<AnimationType>* aCollection)
  {
    mElementCollections.insertBack(aCollection);
  }
  void RemoveAllElementCollections()
  {
    while (AnimationCollection<AnimationType>* head =
           mElementCollections.getFirst()) {
      head->Destroy(); // Note: this removes 'head' from mElementCollections.
    }
  }

  LinkedList<AnimationCollection<AnimationType>> mElementCollections;
  nsPresContext *mPresContext; // weak (non-null from ctor to Disconnect)
};

/**
 * Utility class for referencing the element that created a CSS animation or
 * transition. It is non-owning (i.e. it uses a raw pointer) since it is only
 * expected to be set by the owned animation while it actually being managed
 * by the owning element.
 *
 * This class also abstracts the comparison of an element/pseudo-class pair
 * for the sake of composite ordering since this logic is common to both CSS
 * animations and transitions.
 *
 * (We call this OwningElementRef instead of just OwningElement so that we can
 * call the getter on CSSAnimation/CSSTransition OwningElement() without
 * clashing with this object's contructor.)
 */
class OwningElementRef final
{
public:
  OwningElementRef() = default;

  explicit OwningElementRef(const NonOwningAnimationTarget& aTarget)
    : mTarget(aTarget)
  { }

  OwningElementRef(dom::Element& aElement,
                   CSSPseudoElementType aPseudoType)
    : mTarget(&aElement, aPseudoType)
  { }

  bool Equals(const OwningElementRef& aOther) const
  {
    return mTarget == aOther.mTarget;
  }

  bool LessThan(const OwningElementRef& aOther) const
  {
    MOZ_ASSERT(mTarget.mElement && aOther.mTarget.mElement,
               "Elements to compare should not be null");

    if (mTarget.mElement != aOther.mTarget.mElement) {
      return nsContentUtils::PositionIsBefore(mTarget.mElement,
                                              aOther.mTarget.mElement);
    }

    return mTarget.mPseudoType == CSSPseudoElementType::NotPseudo ||
          (mTarget.mPseudoType == CSSPseudoElementType::before &&
           aOther.mTarget.mPseudoType == CSSPseudoElementType::after);
  }

  bool IsSet() const { return !!mTarget.mElement; }

  void GetElement(dom::Element*& aElement,
                  CSSPseudoElementType& aPseudoType) const
  {
    aElement = mTarget.mElement;
    aPseudoType = mTarget.mPseudoType;
  }

  const NonOwningAnimationTarget& Target() const { return mTarget; }

  nsPresContext* GetPresContext() const
  {
    return nsContentUtils::GetContextForContent(mTarget.mElement);
  }

private:
  NonOwningAnimationTarget mTarget;
};

// Return the TransitionPhase or AnimationPhase to use when the animation
// doesn't have a target effect.
template <typename PhaseType>
PhaseType GetAnimationPhaseWithoutEffect(const dom::Animation& aAnimation)
{
  MOZ_ASSERT(!aAnimation.GetEffect(),
             "Should only be called when we do not have an effect");

// GetCurrentTime is defined in winbase.h as zero argument macro forwarding to
// GetTickCount().
#ifdef GetCurrentTime
#undef GetCurrentTime
#endif

  dom::Nullable<TimeDuration> currentTime = aAnimation.GetCurrentTime();
  if (currentTime.IsNull()) {
    return PhaseType::Idle;
  }

  // If we don't have a target effect, the duration will be zero so the phase is
  // 'before' if the current time is less than zero.
  return currentTime.Value() < TimeDuration()
         ? PhaseType::Before
         : PhaseType::After;
};

inline TimingParams
TimingParamsFromCSSParams(float aDuration, float aDelay,
                          float aIterationCount,
                          dom::PlaybackDirection aDirection,
                          dom::FillMode aFillMode)
{
  MOZ_ASSERT(aIterationCount >= 0.0 && !IsNaN(aIterationCount),
             "aIterations should be nonnegative & finite, as ensured by "
             "CSSParser");

  return TimingParams {
    aDuration,
    aDelay,
    aIterationCount,
    aDirection,
    aFillMode
  };
}

} // namespace mozilla

#endif /* !defined(mozilla_css_AnimationCommon_h) */