/* -*- 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 "nsIContent.h" #include "nsStyleContext.h" #include "nsCSSProps.h" #include "mozilla/TimeStamp.h" #include "nsRefreshDriver.h" #include "nsRuleProcessorData.h" #include "nsIStyleRule.h" #include "nsRuleWalker.h" #include "nsRuleData.h" #include "gfxColor.h" #include "nsCSSPropertySet.h" #include "nsStyleAnimation.h" #include "nsEventDispatcher.h" #include "nsGUIEvent.h" #include "mozilla/dom/Element.h" #include "nsIFrame.h" #include "nsCSSFrameConstructor.h" using mozilla::TimeStamp; using mozilla::TimeDuration; namespace dom = mozilla::dom; namespace css = mozilla::css; ElementTransitions::ElementTransitions(mozilla::dom::Element *aElement, nsIAtom *aElementProperty, nsTransitionManager *aTransitionManager) : CommonElementAnimationData(aElement, aElementProperty, aTransitionManager) { } double ElementPropertyTransition::ValuePortionFor(TimeStamp aRefreshTime) const { // Set |timePortion| to the portion of the way we are through the time // input to the transition's timing function (always within the range // 0-1). double duration = mDuration.ToSeconds(); NS_ABORT_IF_FALSE(duration >= 0.0, "negative duration forbidden"); double timePortion; if (duration == 0.0) { // When duration is zero, we can still have a transition when delay // is nonzero. mStartTime already incorporates delay. if (aRefreshTime >= mStartTime) { timePortion = 1.0; } else { timePortion = 0.0; } } else { timePortion = (aRefreshTime - mStartTime).ToSeconds() / duration; if (timePortion < 0.0) timePortion = 0.0; // use start value during transition-delay if (timePortion > 1.0) timePortion = 1.0; // we might be behind on flushing } return mTimingFunction.GetValue(timePortion); } static void ElementTransitionsPropertyDtor(void *aObject, nsIAtom *aPropertyName, void *aPropertyValue, void *aData) { ElementTransitions *et = static_cast(aPropertyValue); #ifdef DEBUG NS_ABORT_IF_FALSE(!et->mCalledPropertyDtor, "can't call dtor twice"); et->mCalledPropertyDtor = true; #endif delete et; } void ElementTransitions::EnsureStyleRuleFor(TimeStamp aRefreshTime) { if (!mStyleRule || mStyleRuleRefreshTime != aRefreshTime) { mStyleRule = new css::AnimValuesStyleRule(); mStyleRuleRefreshTime = aRefreshTime; for (uint32_t i = 0, i_end = mPropertyTransitions.Length(); i < i_end; ++i) { ElementPropertyTransition &pt = mPropertyTransitions[i]; if (pt.IsRemovedSentinel()) { continue; } nsStyleAnimation::Value *val = mStyleRule->AddEmptyValue(pt.mProperty); double valuePortion = pt.ValuePortionFor(aRefreshTime); #ifdef DEBUG bool ok = #endif nsStyleAnimation::Interpolate(pt.mProperty, pt.mStartValue, pt.mEndValue, valuePortion, *val); NS_ABORT_IF_FALSE(ok, "could not interpolate values"); } } } bool ElementPropertyTransition::IsRunningAt(TimeStamp aTime) const { return !IsRemovedSentinel() && mStartTime < aTime && aTime < mStartTime + mDuration; } bool ElementTransitions::HasTransitionOfProperty(nsCSSProperty aProperty) const { for (uint32_t tranIdx = mPropertyTransitions.Length(); tranIdx-- != 0; ) { if (aProperty == mPropertyTransitions[tranIdx].mProperty) { return true; } } return false; } bool ElementTransitions::CanPerformOnCompositorThread() const { if (mElementProperty != nsGkAtoms::transitionsProperty) { if (nsLayoutUtils::IsAnimationLoggingEnabled()) { printf_stderr("Gecko bug: Async transition of pseudoelements not supported. See bug 771367\n"); } return false; } bool hasGeometricProperty = false; nsIFrame* frame = mElement->GetPrimaryFrame(); TimeStamp now = frame->PresContext()->RefreshDriver()->MostRecentRefresh(); for (uint32_t i = 0, i_end = mPropertyTransitions.Length(); i < i_end; ++i) { const ElementPropertyTransition& pt = mPropertyTransitions[i]; if (css::IsGeometricProperty(pt.mProperty) && pt.IsRunningAt(now)) { hasGeometricProperty = true; break; } } for (uint32_t i = 0, i_end = mPropertyTransitions.Length(); i < i_end; ++i) { const ElementPropertyTransition& pt = mPropertyTransitions[i]; if (pt.IsRemovedSentinel()) { continue; } if (!css::CommonElementAnimationData::CanAnimatePropertyOnCompositor(mElement, pt.mProperty, hasGeometricProperty)) { return false; } } return true; } /***************************************************************************** * nsTransitionManager * *****************************************************************************/ already_AddRefed nsTransitionManager::StyleContextChanged(dom::Element *aElement, nsStyleContext *aOldStyleContext, nsStyleContext *aNewStyleContext) { NS_PRECONDITION(aOldStyleContext->GetPseudo() == aNewStyleContext->GetPseudo(), "pseudo type mismatch"); // If we were called from ReparentStyleContext, this assertion would // actually fire. If we need to be called from there, we can probably // just remove it; the condition probably isn't critical, although // it's worth thinking about some more. NS_PRECONDITION(aOldStyleContext->HasPseudoElementData() == aNewStyleContext->HasPseudoElementData(), "pseudo type mismatch"); // 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 = aNewStyleContext->GetStyleDisplay(); nsCSSPseudoElements::Type pseudoType = aNewStyleContext->GetPseudoType(); if (pseudoType != nsCSSPseudoElements::ePseudo_NotPseudoElement) { if (pseudoType != nsCSSPseudoElements::ePseudo_before && pseudoType != nsCSSPseudoElements::ePseudo_after) { return nullptr; } NS_ASSERTION((pseudoType == nsCSSPseudoElements::ePseudo_before && aElement->Tag() == nsGkAtoms::mozgeneratedcontentbefore) || (pseudoType == nsCSSPseudoElements::ePseudo_after && aElement->Tag() == 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(); } ElementTransitions *et = GetElementTransitions(aElement, pseudoType, false); if (!et && disp->mTransitionPropertyCount == 1 && disp->mTransitions[0].GetDelay() == 0.0f && disp->mTransitions[0].GetDuration() == 0.0f) { return nullptr; } if (aNewStyleContext->PresContext()->IsProcessingAnimationStyleChange()) { return nullptr; } if (aNewStyleContext->GetParent() && aNewStyleContext->GetParent()->HasPseudoElementData()) { // Ignore transitions on things that inherit properties from // pseudo-elements. // FIXME (Bug 522599): Add tests for this. return nullptr; } // 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 nsTransition& t = disp->mTransitions[i]; // Check delay and duration first, since they default to zero, and // when they're both zero, we can ignore the transition. if (t.GetDelay() != 0.0f || t.GetDuration() != 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 == 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, et, aOldStyleContext, aNewStyleContext, &startedAny, &whichStarted); } } else if (nsCSSProps::IsShorthand(property)) { CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(subprop, property) { ConsiderStartingTransition(*subprop, t, aElement, et, aOldStyleContext, aNewStyleContext, &startedAny, &whichStarted); } } else { ConsiderStartingTransition(property, t, aElement, et, aOldStyleContext, aNewStyleContext, &startedAny, &whichStarted); } } } // Stop any transitions for properties that are no longer in // 'transition-property'. // Also stop any transitions for properties that just changed (and are // still in the set of properties to transition), but we didn't just // start the transition because delay and duration are both zero. if (et) { bool checkProperties = disp->mTransitions[0].GetProperty() != eCSSPropertyExtra_all_properties; nsCSSPropertySet allTransitionProperties; if (checkProperties) { for (uint32_t i = disp->mTransitionPropertyCount; i-- != 0; ) { const nsTransition& 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 == 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) { allTransitionProperties.AddProperty(*subprop); } } else { allTransitionProperties.AddProperty(property); } } } nsTArray &pts = et->mPropertyTransitions; uint32_t i = pts.Length(); NS_ABORT_IF_FALSE(i != 0, "empty transitions list?"); nsStyleAnimation::Value currentValue; do { --i; ElementPropertyTransition &pt = pts[i]; // properties no longer in 'transition-property' if ((checkProperties && !allTransitionProperties.HasProperty(pt.mProperty)) || // properties whose computed values changed but delay and // duration are both zero !ExtractComputedValueForTransition(pt.mProperty, aNewStyleContext, currentValue) || currentValue != pt.mEndValue) { // stop the transition pts.RemoveElementAt(i); } } while (i != 0); if (pts.IsEmpty()) { et->Destroy(); et = nullptr; } } if (!startedAny) { return nullptr; } NS_ABORT_IF_FALSE(et, "must have element transitions if we started " "any transitions"); // In the CSS working group discussion (2009 Jul 15 telecon, // http://www.w3.org/mid/4A5E1470.4030904@inkedblade.net ) of // http://lists.w3.org/Archives/Public/www-style/2009Jun/0121.html , // the working group decided that a transition property on an // element should not cause any transitions if the property change // is itself inheriting a value that is transitioning on an // ancestor. So, to get the correct behavior, we continue the // restyle that caused this transition using a "covering" rule that // covers up any changes on which we started transitions, so that // descendants don't start their own transitions. (In the case of // negative transition delay, this covering rule produces different // results than applying the transition rule immediately would). // Our caller is responsible for restyling again using this covering // rule. nsRefPtr coverRule = new css::AnimValuesStyleRule; nsTArray &pts = et->mPropertyTransitions; for (uint32_t i = 0, i_end = pts.Length(); i < i_end; ++i) { ElementPropertyTransition &pt = pts[i]; if (whichStarted.HasProperty(pt.mProperty)) { coverRule->AddValue(pt.mProperty, pt.mStartValue); } } return coverRule.forget(); } void nsTransitionManager::ConsiderStartingTransition(nsCSSProperty aProperty, const nsTransition& aTransition, dom::Element *aElement, ElementTransitions *&aElementTransitions, nsStyleContext *aOldStyleContext, nsStyleContext *aNewStyleContext, bool *aStartedAny, nsCSSPropertySet *aWhichStarted) { // IsShorthand itself will assert if aProperty is not a property. NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aProperty), "property out of range"); 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; } ElementPropertyTransition pt; nsStyleAnimation::Value dummyValue; bool haveValues = ExtractComputedValueForTransition(aProperty, aOldStyleContext, pt.mStartValue) && ExtractComputedValueForTransition(aProperty, aNewStyleContext, pt.mEndValue); bool haveChange = pt.mStartValue != pt.mEndValue; bool haveOMTA = false; if (!aNewStyleContext->GetPseudoType()) { ElementTransitions* et = nsTransitionManager::GetTransitions(aElement); if (et) { haveOMTA = et->CanPerformOnCompositorThread(); } } bool shouldAnimate = haveValues && (haveChange || haveOMTA) && // 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.) nsStyleAnimation::Interpolate(aProperty, pt.mStartValue, pt.mEndValue, 0.5, dummyValue); uint32_t currentIndex = nsTArray::NoIndex; if (aElementTransitions) { nsTArray &pts = aElementTransitions->mPropertyTransitions; for (uint32_t i = 0, i_end = pts.Length(); i < i_end; ++i) { if (pts[i].mProperty == aProperty) { currentIndex = i; break; } } } nsPresContext *presContext = aNewStyleContext->PresContext(); if (!shouldAnimate) { nsTArray &pts = aElementTransitions->mPropertyTransitions; if (currentIndex != nsTArray::NoIndex && (!haveValues || pts[currentIndex].mEndValue != pt.mEndValue)) { // We're in the middle of a transition, but just got a // non-transition style change changing to exactly the // current in-progress value. (This is quite easy to cause // using 'transition-delay'.) // // We also check that this current in-progress value is different // from the end value; we don't want to cancel a transition that // is almost done (and whose current value rounds to its end // value) just because we got an unrelated style change. pts.RemoveElementAt(currentIndex); if (pts.IsEmpty()) { aElementTransitions->Destroy(); // |aElementTransitions| is now a dangling pointer! aElementTransitions = nullptr; } // WalkTransitionRule already called RestyleForAnimation. } return; } TimeStamp mostRecentRefresh = presContext->RefreshDriver()->MostRecentRefresh(); 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; } pt.mStartForReversingTest = pt.mStartValue; pt.mReversePortion = 1.0; // We need to check two things if we have a currently running // transition for this property. if (currentIndex != nsTArray::NoIndex) { const ElementPropertyTransition &oldPT = aElementTransitions->mPropertyTransitions[currentIndex]; if (oldPT.mEndValue == pt.mEndValue) { // 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. // WalkTransitionRule already called RestyleForAnimation. return; } // If the new transition reverses the old one, we'll need to handle // the timing differently. if (!oldPT.IsRemovedSentinel() && oldPT.mStartForReversingTest == pt.mEndValue) { // Compute the appropriate negative transition-delay such that right // now we'd end up at the current position. double valuePortion = oldPT.ValuePortionFor(mostRecentRefresh) * 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; pt.mStartForReversingTest = oldPT.mEndValue; pt.mReversePortion = valuePortion; } } pt.mProperty = aProperty; pt.mStartTime = mostRecentRefresh + TimeDuration::FromMilliseconds(delay); pt.mDuration = TimeDuration::FromMilliseconds(duration); pt.mTimingFunction.Init(tf); if (!aElementTransitions) { aElementTransitions = GetElementTransitions(aElement, aNewStyleContext->GetPseudoType(), true); if (!aElementTransitions) { NS_WARNING("allocating ElementTransitions failed"); return; } } nsTArray &pts = aElementTransitions->mPropertyTransitions; #ifdef DEBUG for (uint32_t i = 0, i_end = pts.Length(); i < i_end; ++i) { NS_ABORT_IF_FALSE(i == currentIndex || pts[i].mProperty != aProperty, "duplicate transitions for property"); } #endif if (currentIndex != nsTArray::NoIndex) { pts[currentIndex] = pt; } else { if (!pts.AppendElement(pt)) { NS_WARNING("out of memory"); return; } } nsRestyleHint hint = aNewStyleContext->GetPseudoType() == nsCSSPseudoElements::ePseudo_NotPseudoElement ? eRestyle_Self : eRestyle_Subtree; presContext->PresShell()->RestyleForAnimation(aElement, hint); // XXXdz: invalidate the frame here, once animations are throttled. *aStartedAny = true; aWhichStarted->AddProperty(aProperty); } ElementTransitions* nsTransitionManager::GetElementTransitions(dom::Element *aElement, nsCSSPseudoElements::Type aPseudoType, bool aCreateIfNeeded) { if (!aCreateIfNeeded && PR_CLIST_IS_EMPTY(&mElementData)) { // Early return for the most common case. return nullptr; } nsIAtom *propName; if (aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) { propName = nsGkAtoms::transitionsProperty; } else if (aPseudoType == nsCSSPseudoElements::ePseudo_before) { propName = nsGkAtoms::transitionsOfBeforeProperty; } else if (aPseudoType == nsCSSPseudoElements::ePseudo_after) { propName = nsGkAtoms::transitionsOfAfterProperty; } else { NS_ASSERTION(!aCreateIfNeeded, "should never try to create transitions for pseudo " "other than :before or :after"); return nullptr; } ElementTransitions *et = static_cast( aElement->GetProperty(propName)); if (!et && aCreateIfNeeded) { // FIXME: Consider arena-allocating? et = new ElementTransitions(aElement, propName, this); nsresult rv = aElement->SetProperty(propName, et, ElementTransitionsPropertyDtor, nullptr); if (NS_FAILED(rv)) { NS_WARNING("SetProperty failed"); delete et; return nullptr; } if (propName == nsGkAtoms::transitionsProperty) { aElement->SetMayHaveAnimations(); } AddElementData(et); } return et; } /* * nsIStyleRuleProcessor implementation */ void nsTransitionManager::WalkTransitionRule(RuleProcessorData* aData, nsCSSPseudoElements::Type aPseudoType) { ElementTransitions *et = GetElementTransitions(aData->mElement, aPseudoType, false); if (!et) { return; } if (aData->mPresContext->IsProcessingRestyles() && !aData->mPresContext->IsProcessingAnimationStyleChange()) { // If we're processing a normal style change rather than one from // animation, don't add the transition rule. This allows us to // compute the new style value rather than having the transition // override it, so that we can start transitioning differently. // We need to immediately restyle with animation // after doing this. if (et) { nsRestyleHint hint = aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ? eRestyle_Self : eRestyle_Subtree; mPresContext->PresShell()->RestyleForAnimation(aData->mElement, hint); } return; } et->EnsureStyleRuleFor( aData->mPresContext->RefreshDriver()->MostRecentRefresh()); aData->mRuleWalker->Forward(et->mStyleRule); } /* virtual */ void nsTransitionManager::RulesMatching(ElementRuleProcessorData* aData) { NS_ABORT_IF_FALSE(aData->mPresContext == mPresContext, "pres context mismatch"); WalkTransitionRule(aData, nsCSSPseudoElements::ePseudo_NotPseudoElement); } /* virtual */ void nsTransitionManager::RulesMatching(PseudoElementRuleProcessorData* aData) { NS_ABORT_IF_FALSE(aData->mPresContext == mPresContext, "pres context mismatch"); // Note: If we're the only thing keeping a pseudo-element frame alive // (per ProbePseudoStyleContext), we still want to keep it alive, so // this is ok. WalkTransitionRule(aData, aData->mPseudoType); } /* virtual */ void nsTransitionManager::RulesMatching(AnonBoxRuleProcessorData* aData) { } #ifdef MOZ_XUL /* virtual */ void nsTransitionManager::RulesMatching(XULTreeRuleProcessorData* aData) { } #endif /* virtual */ size_t nsTransitionManager::SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const { return CommonAnimationManager::SizeOfExcludingThis(aMallocSizeOf); } /* virtual */ size_t nsTransitionManager::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const { return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf); } struct TransitionEventInfo { nsCOMPtr mElement; nsTransitionEvent mEvent; TransitionEventInfo(nsIContent *aElement, nsCSSProperty aProperty, TimeDuration aDuration) : mElement(aElement), mEvent(true, NS_TRANSITION_END, NS_ConvertUTF8toUTF16(nsCSSProps::GetStringValue(aProperty)), aDuration.ToSeconds()) { } // nsTransitionEvent 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, aOther.mEvent.propertyName, aOther.mEvent.elapsedTime) { } }; /* virtual */ void nsTransitionManager::WillRefresh(mozilla::TimeStamp aTime) { NS_ABORT_IF_FALSE(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. RemoveAllElementData(); return; } nsTArray events; // Trim transitions that have completed, and post restyle events for // frames that are still transitioning. { PRCList *next = PR_LIST_HEAD(&mElementData); while (next != &mElementData) { ElementTransitions *et = static_cast(next); next = PR_NEXT_LINK(next); NS_ABORT_IF_FALSE(et->mElement->GetCurrentDoc() == mPresContext->Document(), "nsGenericElement::UnbindFromTree should have " "destroyed the element transitions object"); uint32_t i = et->mPropertyTransitions.Length(); NS_ABORT_IF_FALSE(i != 0, "empty transitions list?"); do { --i; ElementPropertyTransition &pt = et->mPropertyTransitions[i]; if (pt.IsRemovedSentinel()) { // Actually remove transitions one cycle after their // completion. See comment below. et->mPropertyTransitions.RemoveElementAt(i); } else if (pt.mStartTime + pt.mDuration <= aTime) { // Fire transitionend events only for transitions on elements // and not those on pseudo-elements, since we can't target an // event at pseudo-elements. if (et->mElementProperty == nsGkAtoms::transitionsProperty) { nsCSSProperty prop = pt.mProperty; if (nsCSSProps::PropHasFlags(prop, CSS_PROPERTY_REPORT_OTHER_NAME)) { prop = nsCSSProps::OtherNameFor(prop); } events.AppendElement( TransitionEventInfo(et->mElement, prop, pt.mDuration)); } // 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. pt.SetRemovedSentinel(); } } while (i != 0); // We need to restyle even if the transition rule no longer // applies (in which case we just made it not apply). NS_ASSERTION(et->mElementProperty == nsGkAtoms::transitionsProperty || et->mElementProperty == nsGkAtoms::transitionsOfBeforeProperty || et->mElementProperty == nsGkAtoms::transitionsOfAfterProperty, "Unexpected element property; might restyle too much"); nsRestyleHint hint = et->mElementProperty == nsGkAtoms::transitionsProperty ? eRestyle_Self : eRestyle_Subtree; mPresContext->PresShell()->RestyleForAnimation(et->mElement, hint); // XXXdz: if we have started a transition since the last tick and are // performing the transition off the main thread, we need to invalidate // the frame once we start throttling animation ticks. if (et->mPropertyTransitions.IsEmpty()) { et->Destroy(); // |et| is now a dangling pointer! et = nullptr; } } } // We might have removed transitions above. ElementDataRemoved(); for (uint32_t i = 0, i_end = events.Length(); i < i_end; ++i) { TransitionEventInfo &info = events[i]; nsEventDispatcher::Dispatch(info.mElement, mPresContext, &info.mEvent); if (!mPresContext) { break; } } }