C++ Animation::AsCSSAnimation方法代码示例

bool
CSSAnimation::HasLowerCompositeOrderThan(const Animation& aOther) const
{
  // 0. Object-equality case
  if (&aOther == this) {
    return false;
  }

  // 1. Transitions sort lower
  //
  // FIXME: We need to differentiate between transitions and generic Animations.
  // Generic animations don't exist yet (that's bug 1096773) so for now we're
  // ok.
  const CSSAnimation* otherAnimation = aOther.AsCSSAnimation();
  if (!otherAnimation) {
    MOZ_ASSERT(aOther.AsCSSTransition(),
               "Animation being compared is a CSS transition");
    return false;
  }

  // 2. CSS animations using custom composite ordering (i.e. those that
  //    correspond to an animation-name property) sort lower than other CSS
  //    animations (e.g. those created or kept-alive by script).
  if (!IsUsingCustomCompositeOrder()) {
    return !aOther.IsUsingCustomCompositeOrder() ?
           Animation::HasLowerCompositeOrderThan(aOther) :
           false;
  }
  if (!aOther.IsUsingCustomCompositeOrder()) {
    return true;
  }

  // 3. Sort by document order
  MOZ_ASSERT(mOwningElement.IsSet() && otherAnimation->OwningElement().IsSet(),
             "Animations using custom composite order should have an "
             "owning element");
  if (!mOwningElement.Equals(otherAnimation->OwningElement())) {
    return mOwningElement.LessThan(otherAnimation->OwningElement());
  }

  // 4. (Same element and pseudo): Sort by position in animation-name
  return mSequenceNum < otherAnimation->mSequenceNum;
}

bool
CSSAnimation::HasLowerCompositeOrderThan(const Animation& aOther) const
{
  // 0. Object-equality case
  if (&aOther == this) {
    return false;
  }

  // 1. Transitions sort lower
  //
  // FIXME: We need to differentiate between transitions and generic Animations.
  // Generic animations don't exist yet (that's bug 1096773) so for now we're
  // ok.
  const CSSAnimation* otherAnimation = aOther.AsCSSAnimation();
  if (!otherAnimation) {
    MOZ_ASSERT(aOther.AsCSSTransition(),
               "Animation being compared is a CSS transition");
    return false;
  }

  // 2. CSS animations that correspond to an animation-name property sort lower
  //    than other CSS animations (e.g. those created or kept-alive by script).
  if (!IsTiedToMarkup()) {
    return !otherAnimation->IsTiedToMarkup() ?
           Animation::HasLowerCompositeOrderThan(aOther) :
           false;
  }
  if (!otherAnimation->IsTiedToMarkup()) {
    return true;
  }

  // 3. Sort by document order
  if (!mOwningElement.Equals(otherAnimation->mOwningElement)) {
    return mOwningElement.LessThan(otherAnimation->mOwningElement);
  }

  // 4. (Same element and pseudo): Sort by position in animation-name
  return mAnimationIndex < otherAnimation->mAnimationIndex;
}

nsIStyleRule*
nsAnimationManager::CheckAnimationRule(nsStyleContext* aStyleContext,
                                       mozilla::dom::Element* aElement)
{
  // Ignore animations for print or print preview, and for elements
  // that are not attached to the document tree.
  if (!mPresContext->IsDynamic() || !aElement->IsInComposedDoc()) {
    return nullptr;
  }

  // Everything that causes our animation data to change triggers a
  // style change, which in turn triggers a non-animation restyle.
  // Likewise, when we initially construct frames, we're not in a
  // style change, but also not in an animation restyle.

  const nsStyleDisplay* disp = aStyleContext->StyleDisplay();
  AnimationCollection* collection =
    GetAnimations(aElement, aStyleContext->GetPseudoType(), false);
  if (!collection &&
      disp->mAnimationNameCount == 1 &&
      disp->mAnimations[0].GetName().IsEmpty()) {
    return nullptr;
  }

  nsAutoAnimationMutationBatch mb(aElement->OwnerDoc());

  // build the animations list
  dom::DocumentTimeline* timeline = aElement->OwnerDoc()->Timeline();
  AnimationPtrArray newAnimations;
  if (!aStyleContext->IsInDisplayNoneSubtree()) {
    BuildAnimations(aStyleContext, aElement, timeline, newAnimations);
  }

  if (newAnimations.IsEmpty()) {
    if (collection) {
      // There might be transitions that run now that animations don't
      // override them.
      mPresContext->TransitionManager()->
        UpdateCascadeResultsWithAnimationsToBeDestroyed(collection);

      collection->Destroy();
    }
    return nullptr;
  }

  if (collection) {
    collection->mStyleRule = nullptr;
    collection->mStyleRuleRefreshTime = TimeStamp();
    collection->UpdateAnimationGeneration(mPresContext);

    // Copy over the start times and (if still paused) pause starts
    // for each animation (matching on name only) that was also in the
    // old list of animations.
    // This means that we honor dynamic changes, which isn't what the
    // spec says to do, but WebKit seems to honor at least some of
    // them.  See
    // http://lists.w3.org/Archives/Public/www-style/2011Apr/0079.html
    // In order to honor what the spec said, we'd copy more data over
    // (or potentially optimize BuildAnimations to avoid rebuilding it
    // in the first place).
    if (!collection->mAnimations.IsEmpty()) {

      for (size_t newIdx = newAnimations.Length(); newIdx-- != 0;) {
        Animation* newAnim = newAnimations[newIdx];

        // Find the matching animation with this name in the old list
        // of animations.  We iterate through both lists in a backwards
        // direction which means that if there are more animations in
        // the new list of animations with a given name than in the old
        // list, it will be the animations towards the of the beginning of
        // the list that do not match and are treated as new animations.
        nsRefPtr<CSSAnimation> oldAnim;
        size_t oldIdx = collection->mAnimations.Length();
        while (oldIdx-- != 0) {
          CSSAnimation* a = collection->mAnimations[oldIdx]->AsCSSAnimation();
          MOZ_ASSERT(a, "All animations in the CSS Animation collection should"
                        " be CSSAnimation objects");
          if (a->AnimationName() ==
              newAnim->AsCSSAnimation()->AnimationName()) {
            oldAnim = a;
            break;
          }
        }
        if (!oldAnim) {
          // FIXME: Bug 1134163 - We shouldn't queue animationstart events
          // until the animation is actually ready to run. However, we
          // currently have some tests that assume that these events are
          // dispatched within the same tick as the animation is added
          // so we need to queue up any animationstart events from newly-created
          // animations.
          newAnim->AsCSSAnimation()->QueueEvents();
          continue;
        }

        bool animationChanged = false;

        // Update the old from the new so we can keep the original object
        // identity (and any expando properties attached to it).
        if (oldAnim->GetEffect() && newAnim->GetEffect()) {
          KeyframeEffectReadOnly* oldEffect = oldAnim->GetEffect();
//.........这里部分代码省略.........