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gecko-dev/layout/style/nsTransitionManager.cpp

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/* -*- 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 "nsIContent.h"
#include "nsStyleContext.h"
#include "nsCSSProps.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/TimeStamp.h"
#include "nsRefreshDriver.h"
#include "nsRuleProcessorData.h"
#include "nsRuleWalker.h"
#include "nsCSSPropertySet.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/ContentEvents.h"
#include "mozilla/StyleAnimationValue.h"
#include "mozilla/dom/Element.h"
#include "nsIFrame.h"
#include "Layers.h"
#include "FrameLayerBuilder.h"
#include "nsCSSProps.h"
#include "nsDisplayList.h"
#include "nsStyleChangeList.h"
#include "nsStyleSet.h"
#include "RestyleManager.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;
const nsString&
ElementPropertyTransition::Name() const
{
if (!mName.Length()) {
const_cast<ElementPropertyTransition*>(this)->mName =
NS_ConvertUTF8toUTF16(nsCSSProps::GetStringValue(TransitionProperty()));
}
return dom::KeyframeEffectReadOnly::Name();
}
double
ElementPropertyTransition::CurrentValuePortion() const
{
// It would be easy enough to handle finished transitions by using a
// progress of 1 but currently we should not be called for finished
// transitions.
MOZ_ASSERT(!IsFinishedTransition(),
"Getting the value portion of a finished transition");
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.
AnimationTiming timingToUse = mTiming;
timingToUse.mFillMode = NS_STYLE_ANIMATION_FILL_MODE_BOTH;
ComputedTiming computedTiming = GetComputedTiming(&timingToUse);
MOZ_ASSERT(computedTiming.mProgress != ComputedTiming::kNullProgress,
"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 mProperties[0].mSegments[0].mTimingFunction
.GetValue(computedTiming.mProgress);
}
/*****************************************************************************
* CSSTransition *
*****************************************************************************/
mozilla::dom::AnimationPlayState
CSSTransition::PlayStateFromJS() const
{
FlushStyle();
return Animation::PlayStateFromJS();
}
void
CSSTransition::PlayFromJS(ErrorResult& aRv)
{
FlushStyle();
Animation::PlayFromJS(aRv);
}
CommonAnimationManager*
CSSTransition::GetAnimationManager() const
{
nsPresContext* context = GetPresContext();
if (!context) {
return nullptr;
}
return context->TransitionManager();
}
/*****************************************************************************
* nsTransitionManager *
*****************************************************************************/
void
nsTransitionManager::StyleContextChanged(dom::Element *aElement,
nsStyleContext *aOldStyleContext,
nsRefPtr<nsStyleContext>* 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();
nsCSSPseudoElements::Type pseudoType = newStyleContext->GetPseudoType();
if (pseudoType != nsCSSPseudoElements::ePseudo_NotPseudoElement) {
if (pseudoType != nsCSSPseudoElements::ePseudo_before &&
pseudoType != nsCSSPseudoElements::ePseudo_after) {
return;
}
NS_ASSERTION((pseudoType == nsCSSPseudoElements::ePseudo_before &&
aElement->NodeInfo()->NameAtom() == nsGkAtoms::mozgeneratedcontentbefore) ||
(pseudoType == nsCSSPseudoElements::ePseudo_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();
}
AnimationCollection* collection = GetAnimations(aElement, pseudoType, false);
if (!collection &&
disp->mTransitionPropertyCount == 1 &&
disp->mTransitions[0].GetCombinedDuration() <= 0.0f) {
return;
}
if (collection &&
collection->mCheckGeneration ==
mPresContext->RestyleManager()->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->RestyleManager()->
ThrottledAnimationStyleIsUpToDate(),
"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.
nsRefPtr<nsStyleContext> afterChangeStyle;
if (collection) {
nsStyleSet* styleSet = mPresContext->StyleSet();
afterChangeStyle =
styleSet->ResolveStyleWithoutAnimation(aElement, newStyleContext,
eRestyle_CSSTransitions);
} else {
afterChangeStyle = newStyleContext;
}
nsAutoAnimationMutationBatch mb(aElement);
// 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);
}
}
}
AnimationPtrArray& animations = collection->mAnimations;
size_t i = animations.Length();
MOZ_ASSERT(i != 0, "empty transitions list?");
StyleAnimationValue currentValue;
do {
--i;
Animation* 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->GetEffect()->IsFinishedTransition()) {
anim->CancelFromStyle();
collection->UpdateAnimationGeneration(mPresContext);
}
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");
if (collection) {
UpdateCascadeResultsWithTransitions(collection);
// Set the style rule refresh time to null so that EnsureStyleRuleFor
// creates a new style rule if we started *or* stopped transitions.
collection->mStyleRuleRefreshTime = TimeStamp();
collection->UpdateCheckGeneration(mPresContext);
collection->mNeedsRefreshes = true;
TimeStamp now = mPresContext->RefreshDriver()->MostRecentRefresh();
collection->EnsureStyleRuleFor(now, EnsureStyleRule_IsNotThrottled);
}
// 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.
collection->PostRestyleForAnimation(mPresContext);
}
}
void
nsTransitionManager::ConsiderStartingTransition(
nsCSSProperty aProperty,
const StyleTransition& aTransition,
dom::Element* aElement,
AnimationCollection*& 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<ElementPropertyTransition>::NoIndex;
const ElementPropertyTransition *oldPT = nullptr;
if (aElementTransitions) {
AnimationPtrArray& 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 .
MOZ_ASSERT(!oldPT || oldPT->Properties()[0].mSegments.Length() == 1,
"Should have one animation property segment for a transition");
if (haveCurrentTransition && haveValues &&
oldPT->Properties()[0].mSegments[0].mToValue == endValue) {
// GetAnimationRule already called RestyleForAnimation.
return;
}
if (!shouldAnimate) {
if (haveCurrentTransition && !oldPT->IsFinishedTransition()) {
// 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.
AnimationPtrArray& animations = aElementTransitions->mAnimations;
animations[currentIndex]->CancelFromStyle();
oldPT = nullptr; // Clear pointer so it doesn't dangle
animations.RemoveElementAt(currentIndex);
aElementTransitions->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 &&
!oldPT->IsFinishedTransition() &&
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->Properties()[0].mSegments[0].mToValue;
reversePortion = valuePortion;
}
AnimationTiming timing;
timing.mIterationDuration = TimeDuration::FromMilliseconds(duration);
timing.mDelay = TimeDuration::FromMilliseconds(delay);
timing.mIterationCount = 1;
timing.mDirection = NS_STYLE_ANIMATION_DIRECTION_NORMAL;
timing.mFillMode = NS_STYLE_ANIMATION_FILL_MODE_BACKWARDS;
nsRefPtr<ElementPropertyTransition> pt =
new ElementPropertyTransition(aElement->OwnerDoc(), aElement,
aNewStyleContext->GetPseudoType(), timing);
pt->mStartForReversingTest = startForReversingTest;
pt->mReversePortion = reversePortion;
AnimationProperty& prop = *pt->Properties().AppendElement();
prop.mProperty = aProperty;
prop.mWinsInCascade = true;
AnimationPropertySegment& segment = *prop.mSegments.AppendElement();
segment.mFromValue = startValue;
segment.mToValue = endValue;
segment.mFromKey = 0;
segment.mToKey = 1;
segment.mTimingFunction.Init(tf);
nsRefPtr<CSSTransition> animation = new CSSTransition(timeline);
// 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) {
aElementTransitions =
GetAnimations(aElement, aNewStyleContext->GetPseudoType(), true);
if (!aElementTransitions) {
NS_WARNING("allocating CommonAnimationManager failed");
return;
}
}
AnimationPtrArray& 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;
}
}
aElementTransitions->UpdateAnimationGeneration(mPresContext);
*aStartedAny = true;
aWhichStarted->AddProperty(aProperty);
}
void
nsTransitionManager::PruneCompletedTransitions(mozilla::dom::Element* aElement,
nsCSSPseudoElements::Type
aPseudoType,
nsStyleContext* aNewStyleContext)
{
AnimationCollection* collection = GetAnimations(aElement, aPseudoType, false);
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.
AnimationPtrArray& animations = collection->mAnimations;
size_t i = animations.Length();
MOZ_ASSERT(i != 0, "empty transitions list?");
do {
--i;
Animation* anim = animations[i];
dom::KeyframeEffectReadOnly* effect = anim->GetEffect();
if (!effect->IsFinishedTransition()) {
continue;
}
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];
// Since effect is a finished transition, we know it didn't
// influence style.
StyleAnimationValue currentValue;
if (!ExtractComputedValueForTransition(prop.mProperty, aNewStyleContext,
currentValue) ||
currentValue != segment.mToValue) {
animations.RemoveElementAt(i);
}
} while (i != 0);
if (collection->mAnimations.IsEmpty()) {
collection->Destroy();
// |collection| is now a dangling pointer!
collection = nullptr;
}
}
void
nsTransitionManager::UpdateCascadeResultsWithTransitions(
AnimationCollection* aTransitions)
{
AnimationCollection* animations = mPresContext->AnimationManager()->
GetAnimations(aTransitions->mElement,
aTransitions->PseudoElementType(), false);
UpdateCascadeResults(aTransitions, animations);
}
void
nsTransitionManager::UpdateCascadeResultsWithAnimations(
AnimationCollection* aAnimations)
{
AnimationCollection* transitions = mPresContext->TransitionManager()->
GetAnimations(aAnimations->mElement,
aAnimations->PseudoElementType(), false);
UpdateCascadeResults(transitions, aAnimations);
}
void
nsTransitionManager::UpdateCascadeResultsWithAnimationsToBeDestroyed(
const AnimationCollection* aAnimations)
{
// aAnimations is about to be destroyed. So get transitions from it,
// but then don't pass it to UpdateCascadeResults, since it has
// information that may now be incorrect.
AnimationCollection* transitions =
mPresContext->TransitionManager()->
GetAnimations(aAnimations->mElement,
aAnimations->PseudoElementType(), false);
UpdateCascadeResults(transitions, nullptr);
}
void
nsTransitionManager::UpdateCascadeResults(AnimationCollection* aTransitions,
AnimationCollection* aAnimations)
{
if (!aTransitions) {
// Nothing to do.
return;
}
nsCSSPropertySet propertiesUsed;
#ifdef DEBUG
nsCSSPropertySet propertiesWithTransitions;
#endif
// http://dev.w3.org/csswg/css-transitions/#application says that
// transitions do not apply when the same property has a CSS Animation
// on that element (even though animations are lower in the cascade).
if (aAnimations) {
TimeStamp now = mPresContext->RefreshDriver()->MostRecentRefresh();
// Passing EnsureStyleRule_IsThrottled is OK since we will
// unthrottle when animations are finishing.
aAnimations->EnsureStyleRuleFor(now, EnsureStyleRule_IsThrottled);
if (aAnimations->mStyleRule) {
aAnimations->mStyleRule->AddPropertiesToSet(propertiesUsed);
}
}
// Since we should never have more than one transition for the same
// property, it doesn't matter what order we iterate the transitions.
// But let's go the same way as animations.
bool changed = false;
AnimationPtrArray& animations = aTransitions->mAnimations;
for (size_t animIdx = animations.Length(); animIdx-- != 0; ) {
MOZ_ASSERT(animations[animIdx]->GetEffect() &&
animations[animIdx]->GetEffect()->Properties().Length() == 1,
"Should have one animation property for a transition");
AnimationProperty& prop = animations[animIdx]->GetEffect()->Properties()[0];
bool newWinsInCascade = !propertiesUsed.HasProperty(prop.mProperty);
if (prop.mWinsInCascade != newWinsInCascade) {
changed = true;
}
prop.mWinsInCascade = newWinsInCascade;
// assert that we don't need to bother adding the transitioned
// properties into propertiesUsed
#ifdef DEBUG
MOZ_ASSERT(!propertiesWithTransitions.HasProperty(prop.mProperty),
"we're assuming we have only one transition per property");
propertiesWithTransitions.AddProperty(prop.mProperty);
#endif
}
if (changed) {
mPresContext->RestyleManager()->IncrementAnimationGeneration();
aTransitions->UpdateAnimationGeneration(mPresContext);
aTransitions->PostUpdateLayerAnimations();
// Invalidate our style rule.
aTransitions->mStyleRuleRefreshTime = TimeStamp();
aTransitions->mNeedsRefreshes = true;
}
}
/*
* nsIStyleRuleProcessor implementation
*/
/* virtual */ size_t
nsTransitionManager::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
return CommonAnimationManager::SizeOfExcludingThis(aMallocSizeOf);
}
/* virtual */ size_t
nsTransitionManager::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
struct TransitionEventInfo {
nsCOMPtr<nsIContent> mElement;
InternalTransitionEvent mEvent;
TransitionEventInfo(nsIContent *aElement, nsCSSProperty aProperty,
TimeDuration aDuration, const nsAString& aPseudoElement)
: mElement(aElement)
, mEvent(true, NS_TRANSITION_END)
{
// XXX Looks like nobody initialize WidgetEvent::time
mEvent.propertyName =
NS_ConvertUTF8toUTF16(nsCSSProps::GetStringValue(aProperty));
mEvent.elapsedTime = aDuration.ToSeconds();
mEvent.pseudoElement = aPseudoElement;
}
// InternalTransitionEvent doesn't support copy-construction, so we need
// to ourselves in order to work with nsTArray
TransitionEventInfo(const TransitionEventInfo &aOther)
: mElement(aOther.mElement)
, mEvent(true, NS_TRANSITION_END)
{
mEvent.AssignTransitionEventData(aOther.mEvent, false);
}
};
/* virtual */ void
nsTransitionManager::WillRefresh(mozilla::TimeStamp aTime)
{
MOZ_ASSERT(mPresContext,
"refresh driver should not notify additional observers "
"after pres context has been destroyed");
if (!mPresContext->GetPresShell()) {
// Someone might be keeping mPresContext alive past the point
// where it has been torn down; don't bother doing anything in
// this case. But do get rid of all our transitions so we stop
// triggering refreshes.
RemoveAllElementCollections();
return;
}
FlushTransitions(Can_Throttle);
}
void
nsTransitionManager::FlushTransitions(FlushFlags aFlags)
{
if (PR_CLIST_IS_EMPTY(&mElementCollections)) {
// no transitions, leave early
return;
}
nsTArray<TransitionEventInfo> events;
TimeStamp now = mPresContext->RefreshDriver()->MostRecentRefresh();
bool didThrottle = false;
// Trim transitions that have completed, post restyle events for frames that
// are still transitioning, and start transitions with delays.
{
PRCList *next = PR_LIST_HEAD(&mElementCollections);
while (next != &mElementCollections) {
AnimationCollection* collection = static_cast<AnimationCollection*>(next);
next = PR_NEXT_LINK(next);
nsAutoAnimationMutationBatch mb(collection->mElement);
collection->Tick();
bool canThrottleTick = aFlags == Can_Throttle &&
collection->CanPerformOnCompositorThread(
AnimationCollection::CanAnimateFlags(0)) &&
collection->CanThrottleAnimation(now);
MOZ_ASSERT(collection->mElement->GetCrossShadowCurrentDoc() ==
mPresContext->Document(),
"Element::UnbindFromTree should have "
"destroyed the element transitions object");
size_t i = collection->mAnimations.Length();
MOZ_ASSERT(i != 0, "empty transitions list?");
bool transitionStartedOrEnded = false;
do {
--i;
Animation* anim = collection->mAnimations[i];
if (!anim->GetEffect()->IsFinishedTransition()) {
MOZ_ASSERT(anim->GetEffect(), "Transitions should have an effect");
ComputedTiming computedTiming =
anim->GetEffect()->GetComputedTiming();
if (computedTiming.mPhase == ComputedTiming::AnimationPhase_After) {
nsCSSProperty prop =
anim->GetEffect()->AsTransition()->TransitionProperty();
TimeDuration duration =
anim->GetEffect()->Timing().mIterationDuration;
events.AppendElement(
TransitionEventInfo(collection->mElement, prop,
duration,
collection->PseudoElement()));
// Leave this transition in the list for one more refresh
// cycle, since we haven't yet processed its style change, and
// if we also have (already, or will have from processing
// transitionend events or other refresh driver notifications)
// a non-animation style change that would affect it, we need
// to know not to start a new transition for the transition
// from the almost-completed value to the final value.
anim->GetEffect()->SetIsFinishedTransition(true);
collection->UpdateAnimationGeneration(mPresContext);
transitionStartedOrEnded = true;
} else if ((computedTiming.mPhase ==
ComputedTiming::AnimationPhase_Active) &&
canThrottleTick &&
!anim->IsRunningOnCompositor()) {
// Start a transition with a delay where we should start the
// transition proper.
collection->UpdateAnimationGeneration(mPresContext);
transitionStartedOrEnded = true;
}
}
} while (i != 0);
// We need to restyle even if the transition rule no longer
// applies (in which case we just made it not apply).
MOZ_ASSERT(collection->mElementProperty ==
nsGkAtoms::transitionsProperty ||
collection->mElementProperty ==
nsGkAtoms::transitionsOfBeforeProperty ||
collection->mElementProperty ==
nsGkAtoms::transitionsOfAfterProperty,
"Unexpected element property; might restyle too much");
if (!canThrottleTick || transitionStartedOrEnded) {
collection->PostRestyleForAnimation(mPresContext);
} else {
didThrottle = true;
}
if (collection->mAnimations.IsEmpty()) {
collection->Destroy();
// |collection| is now a dangling pointer!
collection = nullptr;
}
}
}
if (didThrottle) {
mPresContext->Document()->SetNeedStyleFlush();
}
MaybeStartOrStopObservingRefreshDriver();
for (uint32_t i = 0, i_end = events.Length(); i < i_end; ++i) {
TransitionEventInfo &info = events[i];
EventDispatcher::Dispatch(info.mElement, mPresContext, &info.mEvent);
if (!mPresContext) {
break;
}
}
}
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