// Find the matching animation by |aName| in the old list
// of animations and remove the matched animation from the list.
static already_AddRefed<CSSAnimation>
PopExistingAnimation(const nsAString& aName,
nsAnimationManager::CSSAnimationCollection* aCollection)
{
if (!aCollection) {
return nullptr;
}
// Animations are stored in reverse order to how they appear in the
// animation-name property. However, we want to match animations beginning
// from the end of the animation-name list, so we iterate *forwards*
// through the collection.
for (size_t idx = 0, length = aCollection->mAnimations.Length();
idx != length; ++ idx) {
CSSAnimation* cssAnim = aCollection->mAnimations[idx];
if (cssAnim->AnimationName() == aName) {
RefPtr<CSSAnimation> match = cssAnim;
aCollection->mAnimations.RemoveElementAt(idx);
return match.forget();
}
}
return nullptr;
}
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();
KeyframeEffectReadOnly* newEffect = newAnim->GetEffect();
animationChanged =
oldEffect->Timing() != newEffect->Timing() ||
oldEffect->Properties() != newEffect->Properties();
oldEffect->SetTiming(newEffect->Timing(), *oldAnim);
oldEffect->Properties() = newEffect->Properties();
}
// Handle changes in play state. If the animation is idle, however,
// changes to animation-play-state should *not* restart it.
if (oldAnim->PlayState() != AnimationPlayState::Idle) {
// CSSAnimation takes care of override behavior so that,
// for example, if the author has called pause(), that will
// override the animation-play-state.
// (We should check newAnim->IsStylePaused() but that requires
// downcasting to CSSAnimation and we happen to know that
// newAnim will only ever be paused by calling PauseFromStyle
// making IsPausedOrPausing synonymous in this case.)
if (!oldAnim->IsStylePaused() && newAnim->IsPausedOrPausing()) {
oldAnim->PauseFromStyle();
animationChanged = true;
} else if (oldAnim->IsStylePaused() &&
!newAnim->IsPausedOrPausing()) {
oldAnim->PlayFromStyle();
animationChanged = true;
}
}
oldAnim->CopyAnimationIndex(*newAnim->AsCSSAnimation());
// Updating the effect timing above might already have caused the
// animation to become irrelevant so only add a changed record if
// the animation is still relevant.
if (animationChanged && oldAnim->IsRelevant()) {
nsNodeUtils::AnimationChanged(oldAnim);
}
// Replace new animation with the (updated) old one and remove the
// old one from the array so we don't try to match it any more.
//
// Although we're doing this while iterating this is safe because
// we're not changing the length of newAnimations and we've finished
// iterating over the list of old iterations.
newAnim->CancelFromStyle();
newAnim = nullptr;
newAnimations.ReplaceElementAt(newIdx, oldAnim);
collection->mAnimations.RemoveElementAt(oldIdx);
}
}
} else {
collection =
GetAnimations(aElement, aStyleContext->GetPseudoType(), true);
for (Animation* animation : newAnimations) {
// FIXME: Bug 1134163 - As above, we have shouldn't actually need to
// queue events here. (But we do for now since some tests expect
// animationstart events to be dispatched immediately.)
animation->AsCSSAnimation()->QueueEvents();
}
}
collection->mAnimations.SwapElements(newAnimations);
collection->mNeedsRefreshes = true;
// Cancel removed animations
for (size_t newAnimIdx = newAnimations.Length(); newAnimIdx-- != 0; ) {
newAnimations[newAnimIdx]->CancelFromStyle();
}
UpdateCascadeResults(aStyleContext, collection);
TimeStamp refreshTime = mPresContext->RefreshDriver()->MostRecentRefresh();
collection->EnsureStyleRuleFor(refreshTime);
// We don't actually dispatch the pending events now. We'll either
// dispatch them the next time we get a refresh driver notification
// or the next time somebody calls
// nsPresShell::FlushPendingNotifications.
if (mEventDispatcher.HasQueuedEvents()) {
mPresContext->Document()->SetNeedStyleFlush();
}
return GetAnimationRule(aElement, aStyleContext->GetPseudoType());
}