/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */ /* 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/. */ /* Code to start and animate CSS transitions. */ #include "nsTransitionManager.h" #include "nsAnimationManager.h" #include "mozilla/dom/CSSTransitionBinding.h" #include "nsIContent.h" #include "nsStyleContext.h" #include "mozilla/MemoryReporting.h" #include "mozilla/TimeStamp.h" #include "nsRefreshDriver.h" #include "nsRuleProcessorData.h" #include "nsRuleWalker.h" #include "nsCSSPropertySet.h" #include "mozilla/EffectCompositor.h" #include "mozilla/EffectSet.h" #include "mozilla/EventDispatcher.h" #include "mozilla/StyleAnimationValue.h" #include "mozilla/dom/DocumentTimeline.h" #include "mozilla/dom/Element.h" #include "nsIFrame.h" #include "Layers.h" #include "FrameLayerBuilder.h" #include "nsCSSProps.h" #include "nsCSSPseudoElements.h" #include "nsDisplayList.h" #include "nsStyleChangeList.h" #include "nsStyleSet.h" #include "mozilla/RestyleManagerHandle.h" #include "mozilla/RestyleManagerHandleInlines.h" #include "nsDOMMutationObserver.h" using mozilla::TimeStamp; using mozilla::TimeDuration; using mozilla::dom::Animation; using mozilla::dom::KeyframeEffectReadOnly; using namespace mozilla; using namespace mozilla::css; double ElementPropertyTransition::CurrentValuePortion() const { MOZ_ASSERT(!GetLocalTime().IsNull(), "Getting the value portion of an animation that's not being " "sampled"); // Transitions use a fill mode of 'backwards' so GetComputedTiming will // never return a null time progress due to being *before* the animation // interval. However, it might be possible that we're behind on flushing // causing us to get called *after* the animation interval. So, just in // case, we override the fill mode to 'both' to ensure the progress // is never null. TimingParams timingToUse = SpecifiedTiming(); timingToUse.mFill = dom::FillMode::Both; ComputedTiming computedTiming = GetComputedTiming(&timingToUse); MOZ_ASSERT(!computedTiming.mProgress.IsNull(), "Got a null progress for a fill mode of 'both'"); MOZ_ASSERT(mProperties.Length() == 1, "Should have one animation property for a transition"); MOZ_ASSERT(mProperties[0].mSegments.Length() == 1, "Animation property should have one segment for a transition"); return ComputedTimingFunction::GetPortion( mProperties[0].mSegments[0].mTimingFunction, computedTiming.mProgress.Value()); } ////////////////////////// CSSTransition //////////////////////////// JSObject* CSSTransition::WrapObject(JSContext* aCx, JS::Handle aGivenProto) { return dom::CSSTransitionBinding::Wrap(aCx, this, aGivenProto); } void CSSTransition::GetTransitionProperty(nsString& aRetVal) const { // Once we make the effect property settable (bug 1049975) we will need // to store the transition property on the CSSTransition itself but for // now we can just query the effect. MOZ_ASSERT(mEffect && mEffect->AsTransition(), "Transitions should have a transition effect"); nsCSSProperty prop = mEffect->AsTransition()->TransitionProperty(); aRetVal = NS_ConvertUTF8toUTF16(nsCSSProps::GetStringValue(prop)); } AnimationPlayState CSSTransition::PlayStateFromJS() const { FlushStyle(); return Animation::PlayStateFromJS(); } void CSSTransition::PlayFromJS(ErrorResult& aRv) { FlushStyle(); Animation::PlayFromJS(aRv); } void CSSTransition::UpdateTiming(SeekFlag aSeekFlag, SyncNotifyFlag aSyncNotifyFlag) { if (mNeedsNewAnimationIndexWhenRun && PlayState() != AnimationPlayState::Idle) { mAnimationIndex = sNextAnimationIndex++; mNeedsNewAnimationIndexWhenRun = false; } Animation::UpdateTiming(aSeekFlag, aSyncNotifyFlag); } void CSSTransition::QueueEvents() { AnimationPlayState playState = PlayState(); bool newlyFinished = !mWasFinishedOnLastTick && playState == AnimationPlayState::Finished; mWasFinishedOnLastTick = playState == AnimationPlayState::Finished; if (!newlyFinished || !mEffect || !mOwningElement.IsSet()) { return; } dom::Element* owningElement; CSSPseudoElementType owningPseudoType; mOwningElement.GetElement(owningElement, owningPseudoType); MOZ_ASSERT(owningElement, "Owning element should be set"); // Do not queue any event for disabled properties. This could happen // if the property has a default value which derives value from other // property, e.g. color. nsCSSProperty property = TransitionProperty(); if (!nsCSSProps::IsEnabled(property, nsCSSProps::eEnabledForAllContent) && (!nsContentUtils::IsSystemPrincipal(owningElement->NodePrincipal()) || !nsCSSProps::IsEnabled(property, nsCSSProps::eEnabledInChrome))) { return; } nsPresContext* presContext = mOwningElement.GetRenderedPresContext(); if (!presContext) { return; } nsTransitionManager* manager = presContext->TransitionManager(); manager->QueueEvent(TransitionEventInfo(owningElement, owningPseudoType, property, mEffect->GetComputedTiming() .mDuration, AnimationTimeToTimeStamp(EffectEnd()), this)); } void CSSTransition::Tick() { Animation::Tick(); QueueEvents(); } nsCSSProperty CSSTransition::TransitionProperty() const { // FIXME: Once we support replacing/removing the effect (bug 1049975) // we'll need to store the original transition property so we keep // returning the same value in that case. dom::KeyframeEffectReadOnly* effect = GetEffect(); MOZ_ASSERT(effect && effect->AsTransition(), "Transition should have a transition effect"); return effect->AsTransition()->TransitionProperty(); } bool CSSTransition::HasLowerCompositeOrderThan(const CSSTransition& aOther) const { MOZ_ASSERT(IsTiedToMarkup() && aOther.IsTiedToMarkup(), "Should only be called for CSS transitions that are sorted " "as CSS transitions (i.e. tied to CSS markup)"); // 0. Object-equality case if (&aOther == this) { return false; } // 1. Sort by document order if (!mOwningElement.Equals(aOther.mOwningElement)) { return mOwningElement.LessThan(aOther.mOwningElement); } // 2. (Same element and pseudo): Sort by transition generation if (mAnimationIndex != aOther.mAnimationIndex) { return mAnimationIndex < aOther.mAnimationIndex; } // 3. (Same transition generation): Sort by transition property return nsCSSProps::GetStringValue(TransitionProperty()) < nsCSSProps::GetStringValue(aOther.TransitionProperty()); } ////////////////////////// nsTransitionManager //////////////////////////// NS_IMPL_CYCLE_COLLECTION(nsTransitionManager, mEventDispatcher) NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(nsTransitionManager, AddRef) NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(nsTransitionManager, Release) void nsTransitionManager::StyleContextChanged(dom::Element *aElement, nsStyleContext *aOldStyleContext, RefPtr* aNewStyleContext /* inout */) { nsStyleContext* newStyleContext = *aNewStyleContext; NS_PRECONDITION(aOldStyleContext->GetPseudo() == newStyleContext->GetPseudo(), "pseudo type mismatch"); if (mInAnimationOnlyStyleUpdate) { // If we're doing an animation-only style update, return, since the // purpose of an animation-only style update is to update only the // animation styles so that we don't consider style changes // resulting from changes in the animation time for starting a // transition. return; } if (!mPresContext->IsDynamic()) { // For print or print preview, ignore transitions. return; } if (aOldStyleContext->HasPseudoElementData() != newStyleContext->HasPseudoElementData()) { // If the old style context and new style context differ in terms of // whether they're inside ::first-letter, ::first-line, or similar, // bail. We can't hit this codepath for normal style changes // involving moving frames around the boundaries of these // pseudo-elements since we don't call StyleContextChanged from // ReparentStyleContext. However, we can hit this codepath during // the handling of transitions that start across reframes. // // While there isn't an easy *perfect* way to handle this case, err // on the side of missing some transitions that we ought to have // rather than having bogus transitions that we shouldn't. // // We could consider changing this handling, although it's worth // thinking about whether the code below could do anything weird in // this case. return; } // NOTE: Things in this function (and ConsiderStartingTransition) // should never call PeekStyleData because we don't preserve gotten // structs across reframes. // Return sooner (before the startedAny check below) for the most // common case: no transitions specified or running. const nsStyleDisplay *disp = newStyleContext->StyleDisplay(); CSSPseudoElementType pseudoType = newStyleContext->GetPseudoType(); if (pseudoType != CSSPseudoElementType::NotPseudo) { if (pseudoType != CSSPseudoElementType::before && pseudoType != CSSPseudoElementType::after) { return; } NS_ASSERTION((pseudoType == CSSPseudoElementType::before && aElement->NodeInfo()->NameAtom() == nsGkAtoms::mozgeneratedcontentbefore) || (pseudoType == CSSPseudoElementType::after && aElement->NodeInfo()->NameAtom() == nsGkAtoms::mozgeneratedcontentafter), "Unexpected aElement coming through"); // Else the element we want to use from now on is the element the // :before or :after is attached to. aElement = aElement->GetParent()->AsElement(); } CSSTransitionCollection* collection = CSSTransitionCollection::GetAnimationCollection(aElement, pseudoType); if (!collection && disp->mTransitionPropertyCount == 1 && disp->mTransitions[0].GetCombinedDuration() <= 0.0f) { return; } MOZ_ASSERT(mPresContext->RestyleManager()->IsGecko(), "ServoRestyleManager should not use nsTransitionManager " "for transitions"); if (collection && collection->mCheckGeneration == mPresContext->RestyleManager()->AsGecko()->GetAnimationGeneration()) { // When we start a new transition, we immediately post a restyle. // If the animation generation on the collection is current, that // means *this* is that restyle, since we bump the animation // generation on the restyle manager whenever there's a real style // change (i.e., one where mInAnimationOnlyStyleUpdate isn't true, // which causes us to return above). Thus we shouldn't do anything. return; } if (newStyleContext->GetParent() && newStyleContext->GetParent()->HasPseudoElementData()) { // Ignore transitions on things that inherit properties from // pseudo-elements. // FIXME (Bug 522599): Add tests for this. return; } NS_WARN_IF_FALSE(!nsLayoutUtils::AreAsyncAnimationsEnabled() || !mPresContext->EffectCompositor()-> HasThrottledStyleUpdates(), "throttled animations not up to date"); // Compute what the css-transitions spec calls the "after-change // style", which is the new style without any data from transitions, // but still inheriting from data that contains transitions that are // not stopping or starting right now. RefPtr afterChangeStyle; if (collection) { MOZ_ASSERT(mPresContext->StyleSet()->IsGecko(), "ServoStyleSets should not use nsTransitionManager " "for transitions"); nsStyleSet* styleSet = mPresContext->StyleSet()->AsGecko(); afterChangeStyle = styleSet->ResolveStyleWithoutAnimation(aElement, newStyleContext, eRestyle_CSSTransitions); } else { afterChangeStyle = newStyleContext; } nsAutoAnimationMutationBatch mb(aElement->OwnerDoc()); // Per http://lists.w3.org/Archives/Public/www-style/2009Aug/0109.html // I'll consider only the transitions from the number of items in // 'transition-property' on down, and later ones will override earlier // ones (tracked using |whichStarted|). bool startedAny = false; nsCSSPropertySet whichStarted; for (uint32_t i = disp->mTransitionPropertyCount; i-- != 0; ) { const StyleTransition& t = disp->mTransitions[i]; // Check the combined duration (combination of delay and duration) // first, since it defaults to zero, which means we can ignore the // transition. if (t.GetCombinedDuration() > 0.0f) { // We might have something to transition. See if any of the // properties in question changed and are animatable. // FIXME: Would be good to find a way to share code between this // interpretation of transition-property and the one below. nsCSSProperty property = t.GetProperty(); if (property == eCSSPropertyExtra_no_properties || property == eCSSPropertyExtra_variable || property == eCSSProperty_UNKNOWN) { // Nothing to do, but need to exclude this from cases below. } else if (property == eCSSPropertyExtra_all_properties) { for (nsCSSProperty p = nsCSSProperty(0); p < eCSSProperty_COUNT_no_shorthands; p = nsCSSProperty(p + 1)) { ConsiderStartingTransition(p, t, aElement, collection, aOldStyleContext, afterChangeStyle, &startedAny, &whichStarted); } } else if (nsCSSProps::IsShorthand(property)) { CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES( subprop, property, nsCSSProps::eEnabledForAllContent) { ConsiderStartingTransition(*subprop, t, aElement, collection, aOldStyleContext, afterChangeStyle, &startedAny, &whichStarted); } } else { ConsiderStartingTransition(property, t, aElement, collection, aOldStyleContext, afterChangeStyle, &startedAny, &whichStarted); } } } // Stop any transitions for properties that are no longer in // 'transition-property', including finished transitions. // Also stop any transitions (and remove any finished transitions) // for properties that just changed (and are still in the set of // properties to transition), but for which we didn't just start the // transition. This can happen delay and duration are both zero, or // because the new value is not interpolable. // Note that we also do the latter set of work in // nsTransitionManager::PruneCompletedTransitions. if (collection) { bool checkProperties = disp->mTransitions[0].GetProperty() != eCSSPropertyExtra_all_properties; nsCSSPropertySet allTransitionProperties; if (checkProperties) { for (uint32_t i = disp->mTransitionPropertyCount; i-- != 0; ) { const StyleTransition& t = disp->mTransitions[i]; // FIXME: Would be good to find a way to share code between this // interpretation of transition-property and the one above. nsCSSProperty property = t.GetProperty(); if (property == eCSSPropertyExtra_no_properties || property == eCSSPropertyExtra_variable || property == eCSSProperty_UNKNOWN) { // Nothing to do, but need to exclude this from cases below. } else if (property == eCSSPropertyExtra_all_properties) { for (nsCSSProperty p = nsCSSProperty(0); p < eCSSProperty_COUNT_no_shorthands; p = nsCSSProperty(p + 1)) { allTransitionProperties.AddProperty(p); } } else if (nsCSSProps::IsShorthand(property)) { CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES( subprop, property, nsCSSProps::eEnabledForAllContent) { allTransitionProperties.AddProperty(*subprop); } } else { allTransitionProperties.AddProperty(property); } } } OwningCSSTransitionPtrArray& animations = collection->mAnimations; size_t i = animations.Length(); MOZ_ASSERT(i != 0, "empty transitions list?"); StyleAnimationValue currentValue; do { --i; CSSTransition* anim = animations[i]; dom::KeyframeEffectReadOnly* effect = anim->GetEffect(); MOZ_ASSERT(effect && effect->Properties().Length() == 1, "Should have one animation property for a transition"); MOZ_ASSERT(effect && effect->Properties()[0].mSegments.Length() == 1, "Animation property should have one segment for a transition"); const AnimationProperty& prop = effect->Properties()[0]; const AnimationPropertySegment& segment = prop.mSegments[0]; // properties no longer in 'transition-property' if ((checkProperties && !allTransitionProperties.HasProperty(prop.mProperty)) || // properties whose computed values changed but for which we // did not start a new transition (because delay and // duration are both zero, or because the new value is not // interpolable); a new transition would have segment.mToValue // matching currentValue !ExtractComputedValueForTransition(prop.mProperty, afterChangeStyle, currentValue) || currentValue != segment.mToValue) { // stop the transition if (anim->HasCurrentEffect()) { EffectSet* effectSet = EffectSet::GetEffectSet(aElement, pseudoType); if (effectSet) { effectSet->UpdateAnimationGeneration(mPresContext); } } anim->CancelFromStyle(); animations.RemoveElementAt(i); } } while (i != 0); if (animations.IsEmpty()) { collection->Destroy(); collection = nullptr; } } MOZ_ASSERT(!startedAny || collection, "must have element transitions if we started any transitions"); EffectCompositor::CascadeLevel cascadeLevel = EffectCompositor::CascadeLevel::Transitions; if (collection) { EffectCompositor::UpdateCascadeResults(aElement, pseudoType, newStyleContext); collection->UpdateCheckGeneration(mPresContext); mPresContext->EffectCompositor()->MaybeUpdateAnimationRule(aElement, pseudoType, cascadeLevel); } // We want to replace the new style context with the after-change style. *aNewStyleContext = afterChangeStyle; if (collection) { // Since we have transition styles, we have to undo this replacement. // The check of collection->mCheckGeneration against the restyle // manager's GetAnimationGeneration() will ensure that we don't go // through the rest of this function again when we do. mPresContext->EffectCompositor()->PostRestyleForAnimation(aElement, pseudoType, cascadeLevel); } } void nsTransitionManager::ConsiderStartingTransition( nsCSSProperty aProperty, const StyleTransition& aTransition, dom::Element* aElement, CSSTransitionCollection*& aElementTransitions, nsStyleContext* aOldStyleContext, nsStyleContext* aNewStyleContext, bool* aStartedAny, nsCSSPropertySet* aWhichStarted) { // IsShorthand itself will assert if aProperty is not a property. MOZ_ASSERT(!nsCSSProps::IsShorthand(aProperty), "property out of range"); NS_ASSERTION(!aElementTransitions || aElementTransitions->mElement == aElement, "Element mismatch"); if (aWhichStarted->HasProperty(aProperty)) { // A later item in transition-property already started a // transition for this property, so we ignore this one. // See comment above and // http://lists.w3.org/Archives/Public/www-style/2009Aug/0109.html . return; } if (nsCSSProps::kAnimTypeTable[aProperty] == eStyleAnimType_None) { return; } dom::DocumentTimeline* timeline = aElement->OwnerDoc()->Timeline(); StyleAnimationValue startValue, endValue, dummyValue; bool haveValues = ExtractComputedValueForTransition(aProperty, aOldStyleContext, startValue) && ExtractComputedValueForTransition(aProperty, aNewStyleContext, endValue); bool haveChange = startValue != endValue; bool shouldAnimate = haveValues && haveChange && // Check that we can interpolate between these values // (If this is ever a performance problem, we could add a // CanInterpolate method, but it seems fine for now.) StyleAnimationValue::Interpolate(aProperty, startValue, endValue, 0.5, dummyValue); bool haveCurrentTransition = false; size_t currentIndex = nsTArray::NoIndex; const ElementPropertyTransition *oldPT = nullptr; if (aElementTransitions) { OwningCSSTransitionPtrArray& animations = aElementTransitions->mAnimations; for (size_t i = 0, i_end = animations.Length(); i < i_end; ++i) { const ElementPropertyTransition *iPt = animations[i]->GetEffect()->AsTransition(); if (iPt->TransitionProperty() == aProperty) { haveCurrentTransition = true; currentIndex = i; oldPT = iPt; break; } } } // If we got a style change that changed the value to the endpoint // of the currently running transition, we don't want to interrupt // its timing function. // This needs to be before the !shouldAnimate && haveCurrentTransition // case below because we might be close enough to the end of the // transition that the current value rounds to the final value. In // this case, we'll end up with shouldAnimate as false (because // there's no value change), but we need to return early here rather // than cancel the running transition because shouldAnimate is false! // // Likewise, if we got a style change that changed the value to the // endpoint of our finished transition, we also don't want to start // a new transition for the reasons described in // https://lists.w3.org/Archives/Public/www-style/2015Jan/0444.html . if (haveCurrentTransition && haveValues && oldPT->ToValue() == endValue) { // GetAnimationRule already called RestyleForAnimation. return; } if (!shouldAnimate) { if (haveCurrentTransition) { // We're in the middle of a transition, and just got a non-transition // style change to something that we can't animate. This might happen // because we got a non-transition style change changing to the current // in-progress value (which is particularly easy to cause when we're // currently in the 'transition-delay'). It also might happen because we // just got a style change to a value that can't be interpolated. OwningCSSTransitionPtrArray& animations = aElementTransitions->mAnimations; animations[currentIndex]->CancelFromStyle(); oldPT = nullptr; // Clear pointer so it doesn't dangle animations.RemoveElementAt(currentIndex); EffectSet* effectSet = EffectSet::GetEffectSet(aElement, aNewStyleContext->GetPseudoType()); if (effectSet) { effectSet->UpdateAnimationGeneration(mPresContext); } if (animations.IsEmpty()) { aElementTransitions->Destroy(); // |aElementTransitions| is now a dangling pointer! aElementTransitions = nullptr; } // GetAnimationRule already called RestyleForAnimation. } return; } const nsTimingFunction &tf = aTransition.GetTimingFunction(); float delay = aTransition.GetDelay(); float duration = aTransition.GetDuration(); if (duration < 0.0) { // The spec says a negative duration is treated as zero. duration = 0.0; } StyleAnimationValue startForReversingTest = startValue; double reversePortion = 1.0; // If the new transition reverses an existing one, we'll need to // handle the timing differently. if (haveCurrentTransition && aElementTransitions->mAnimations[currentIndex]->HasCurrentEffect() && oldPT->mStartForReversingTest == endValue) { // Compute the appropriate negative transition-delay such that right // now we'd end up at the current position. double valuePortion = oldPT->CurrentValuePortion() * oldPT->mReversePortion + (1.0 - oldPT->mReversePortion); // A timing function with negative y1 (or y2!) might make // valuePortion negative. In this case, we still want to apply our // reversing logic based on relative distances, not make duration // negative. if (valuePortion < 0.0) { valuePortion = -valuePortion; } // A timing function with y2 (or y1!) greater than one might // advance past its terminal value. It's probably a good idea to // clamp valuePortion to be at most one to preserve the invariant // that a transition will complete within at most its specified // time. if (valuePortion > 1.0) { valuePortion = 1.0; } // Negative delays are essentially part of the transition // function, so reduce them along with the duration, but don't // reduce positive delays. if (delay < 0.0f) { delay *= valuePortion; } duration *= valuePortion; startForReversingTest = oldPT->ToValue(); reversePortion = valuePortion; } TimingParams timing; timing.mDuration.emplace(StickyTimeDuration::FromMilliseconds(duration)); timing.mDelay = TimeDuration::FromMilliseconds(delay); timing.mIterations = 1.0; timing.mDirection = dom::PlaybackDirection::Normal; timing.mFill = dom::FillMode::Backwards; RefPtr pt = new ElementPropertyTransition(aElement->OwnerDoc(), aElement, aNewStyleContext->GetPseudoType(), timing, startForReversingTest, reversePortion); AnimationProperty& prop = *pt->Properties().AppendElement(); prop.mProperty = aProperty; AnimationPropertySegment& segment = *prop.mSegments.AppendElement(); segment.mFromValue = startValue; segment.mToValue = endValue; segment.mFromKey = 0; segment.mToKey = 1; if (tf.mType != nsTimingFunction::Type::Linear) { ComputedTimingFunction computedTimingFunction; computedTimingFunction.Init(tf); segment.mTimingFunction = Some(computedTimingFunction); } MOZ_ASSERT(mPresContext->RestyleManager()->IsGecko(), "ServoRestyleManager should not use nsTransitionManager " "for transitions"); RefPtr animation = new CSSTransition(mPresContext->Document()->GetScopeObject()); animation->SetOwningElement( OwningElementRef(*aElement, aNewStyleContext->GetPseudoType())); animation->SetTimeline(timeline); animation->SetCreationSequence( mPresContext->RestyleManager()->AsGecko()->GetAnimationGeneration()); // The order of the following two calls is important since PlayFromStyle // will add the animation to the PendingAnimationTracker of its effect's // document. When we come to make effect writeable (bug 1049975) we should // remove this dependency. animation->SetEffect(pt); animation->PlayFromStyle(); if (!aElementTransitions) { bool createdCollection = false; aElementTransitions = CSSTransitionCollection::GetOrCreateAnimationCollection( aElement, aNewStyleContext->GetPseudoType(), &createdCollection); if (!aElementTransitions) { MOZ_ASSERT(!createdCollection, "outparam should agree with return value"); NS_WARNING("allocating collection failed"); return; } if (createdCollection) { AddElementCollection(aElementTransitions); } } OwningCSSTransitionPtrArray& animations = aElementTransitions->mAnimations; #ifdef DEBUG for (size_t i = 0, i_end = animations.Length(); i < i_end; ++i) { MOZ_ASSERT( i == currentIndex || (animations[i]->GetEffect() && animations[i]->GetEffect()->AsTransition()->TransitionProperty() != aProperty), "duplicate transitions for property"); } #endif if (haveCurrentTransition) { animations[currentIndex]->CancelFromStyle(); oldPT = nullptr; // Clear pointer so it doesn't dangle animations[currentIndex] = animation; } else { if (!animations.AppendElement(animation)) { NS_WARNING("out of memory"); return; } } EffectSet* effectSet = EffectSet::GetEffectSet(aElement, aNewStyleContext->GetPseudoType()); if (effectSet) { effectSet->UpdateAnimationGeneration(mPresContext); } *aStartedAny = true; aWhichStarted->AddProperty(aProperty); } void nsTransitionManager::PruneCompletedTransitions(mozilla::dom::Element* aElement, CSSPseudoElementType aPseudoType, nsStyleContext* aNewStyleContext) { CSSTransitionCollection* collection = CSSTransitionCollection::GetAnimationCollection(aElement, aPseudoType); if (!collection) { return; } // Remove any finished transitions whose style doesn't match the new // style. // This is similar to some of the work that happens near the end of // nsTransitionManager::StyleContextChanged. // FIXME (bug 1158431): Really, we should also cancel running // transitions whose destination doesn't match as well. OwningCSSTransitionPtrArray& animations = collection->mAnimations; size_t i = animations.Length(); MOZ_ASSERT(i != 0, "empty transitions list?"); do { --i; CSSTransition* anim = animations[i]; if (anim->HasCurrentEffect()) { continue; } dom::KeyframeEffectReadOnly* effect = anim->GetEffect(); MOZ_ASSERT(effect->Properties().Length() == 1, "Should have one animation property for a transition"); MOZ_ASSERT(effect->Properties()[0].mSegments.Length() == 1, "Animation property should have one segment for a transition"); const AnimationProperty& prop = effect->Properties()[0]; const AnimationPropertySegment& segment = prop.mSegments[0]; // Since effect is a finished transition, we know it didn't // influence style. StyleAnimationValue currentValue; if (!ExtractComputedValueForTransition(prop.mProperty, aNewStyleContext, currentValue) || currentValue != segment.mToValue) { anim->CancelFromStyle(); animations.RemoveElementAt(i); } } while (i != 0); if (collection->mAnimations.IsEmpty()) { collection->Destroy(); // |collection| is now a dangling pointer! collection = nullptr; } }