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/*
* Copyright (C) Canon Inc. 2016
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "AnimationTimeline.h"
#include "Animation.h"
#include "AnimationEffect.h"
#include "AnimationList.h"
#include "CSSAnimation.h"
#include "CSSPropertyAnimation.h"
#include "CSSTransition.h"
#include "DocumentTimeline.h"
#include "Element.h"
#include "KeyframeEffect.h"
#include "KeyframeEffectStack.h"
#include "PseudoElement.h"
#include "RenderStyle.h"
#include "RenderView.h"
#include "StylePropertyShorthand.h"
#include "StyleResolver.h"
#include "WebAnimationUtilities.h"
#include <wtf/text/TextStream.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
AnimationTimeline::AnimationTimeline() = default;
AnimationTimeline::~AnimationTimeline() = default;
void AnimationTimeline::forgetAnimation(WebAnimation* animation)
{
m_allAnimations.removeFirst(animation);
}
void AnimationTimeline::animationTimingDidChange(WebAnimation& animation)
{
updateGlobalPosition(animation);
if (m_animations.add(&animation)) {
m_allAnimations.append(makeWeakPtr(&animation));
auto* timeline = animation.timeline();
if (timeline && timeline != this)
timeline->removeAnimation(animation);
}
}
void AnimationTimeline::updateGlobalPosition(WebAnimation& animation)
{
static uint64_t s_globalPosition = 0;
if (!animation.globalPosition() && animation.canHaveGlobalPosition())
animation.setGlobalPosition(++s_globalPosition);
}
void AnimationTimeline::removeAnimation(WebAnimation& animation)
{
ASSERT(!animation.timeline() || animation.timeline() == this);
m_animations.remove(&animation);
if (is<KeyframeEffect>(animation.effect())) {
if (auto* target = downcast<KeyframeEffect>(animation.effect())->targetElementOrPseudoElement()) {
animationWasRemovedFromElement(animation, *target);
target->ensureKeyframeEffectStack().removeEffect(*downcast<KeyframeEffect>(animation.effect()));
}
}
}
Optional<double> AnimationTimeline::bindingsCurrentTime()
{
auto time = currentTime();
if (!time)
return WTF::nullopt;
return secondsToWebAnimationsAPITime(*time);
}
void AnimationTimeline::animationWasAddedToElement(WebAnimation& animation, Element& element)
{
if (is<CSSTransition>(animation) && downcast<CSSTransition>(animation).owningElement() == &element)
element.ensureTransitions().add(&animation);
else if (is<CSSAnimation>(animation) && downcast<CSSAnimation>(animation).owningElement() == &element)
element.ensureCSSAnimations().add(&animation);
else
element.ensureWebAnimations().add(&animation);
}
static inline bool removeCSSTransitionFromMap(CSSTransition& transition, PropertyToTransitionMap& cssTransitionsByProperty)
{
auto transitionIterator = cssTransitionsByProperty.find(transition.property());
if (transitionIterator == cssTransitionsByProperty.end() || transitionIterator->value != &transition)
return false;
cssTransitionsByProperty.remove(transitionIterator);
return true;
}
void AnimationTimeline::animationWasRemovedFromElement(WebAnimation& animation, Element& element)
{
element.ensureTransitions().remove(&animation);
element.ensureCSSAnimations().remove(&animation);
element.ensureWebAnimations().remove(&animation);
// Now, if we're dealing with a CSS Transition, we remove it from the m_elementToRunningCSSTransitionByCSSPropertyID map.
// We don't need to do this for CSS Animations because their timing can be set via CSS to end, which would cause this
// function to be called, but they should remain associated with their owning element until this is changed via a call
// to the JS API or changing the target element's animation-name property.
if (is<CSSTransition>(animation))
removeDeclarativeAnimationFromListsForOwningElement(animation, element);
}
void AnimationTimeline::removeDeclarativeAnimationFromListsForOwningElement(WebAnimation& animation, Element& element)
{
ASSERT(is<DeclarativeAnimation>(animation));
if (is<CSSTransition>(animation)) {
auto& transition = downcast<CSSTransition>(animation);
if (!removeCSSTransitionFromMap(transition, element.ensureRunningTransitionsByProperty()))
removeCSSTransitionFromMap(transition, element.ensureCompletedTransitionsByProperty());
}
}
Vector<RefPtr<WebAnimation>> AnimationTimeline::animationsForElement(Element& element, Ordering ordering) const
{
Vector<RefPtr<WebAnimation>> animations;
if (ordering == Ordering::Sorted) {
if (element.hasKeyframeEffects()) {
for (auto& effect : element.ensureKeyframeEffectStack().sortedEffects())
animations.append(effect->animation());
}
} else {
if (auto* cssTransitions = element.transitions())
animations.appendRange(cssTransitions->begin(), cssTransitions->end());
if (auto* cssAnimations = element.cssAnimations())
animations.appendRange(cssAnimations->begin(), cssAnimations->end());
if (auto* webAnimations = element.webAnimations())
animations.appendRange(webAnimations->begin(), webAnimations->end());
}
return animations;
}
void AnimationTimeline::removeCSSAnimationCreatedByMarkup(Element& element, CSSAnimation& cssAnimation)
{
element.animationsCreatedByMarkup().remove(&cssAnimation);
if (!element.hasKeyframeEffects())
return;
auto& keyframeEffectStack = element.ensureKeyframeEffectStack();
auto* cssAnimationList = keyframeEffectStack.cssAnimationList();
if (!cssAnimationList || cssAnimationList->isEmpty())
return;
auto& backingAnimation = cssAnimation.backingAnimation();
for (size_t i = 0; i < cssAnimationList->size(); ++i) {
if (cssAnimationList->animation(i) == backingAnimation) {
auto newAnimationList = cssAnimationList->copy();
newAnimationList->remove(i);
keyframeEffectStack.setCSSAnimationList(WTFMove(newAnimationList));
return;
}
}
}
void AnimationTimeline::elementWasRemoved(Element& element)
{
cancelDeclarativeAnimationsForElement(element, WebAnimation::Silently::Yes);
}
void AnimationTimeline::willChangeRendererForElement(Element& element)
{
for (auto& animation : animationsForElement(element))
animation->willChangeRenderer();
}
void AnimationTimeline::cancelDeclarativeAnimationsForElement(Element& element, WebAnimation::Silently silently)
{
if (auto* transitions = element.transitions()) {
for (auto& cssTransition : *transitions)
cssTransition->cancel(silently);
}
if (auto* cssAnimations = element.cssAnimations()) {
for (auto& cssAnimation : *cssAnimations) {
if (is<CSSAnimation>(cssAnimation))
removeCSSAnimationCreatedByMarkup(element, downcast<CSSAnimation>(*cssAnimation));
cssAnimation->cancel(silently);
}
}
}
static bool shouldConsiderAnimation(Element& elementOrPseudoElement, const Animation& animation)
{
if (!animation.isValidAnimation())
return false;
static NeverDestroyed<const String> animationNameNone(MAKE_STATIC_STRING_IMPL("none"));
auto& name = animation.name();
if (name == animationNameNone || name.isEmpty())
return false;
auto& element = is<PseudoElement>(elementOrPseudoElement) ? *downcast<PseudoElement>(elementOrPseudoElement).hostElement() : elementOrPseudoElement;
if (auto* styleScope = Style::Scope::forOrdinal(element, animation.nameStyleScopeOrdinal()))
return styleScope->resolver().isAnimationNameValid(name);
return false;
}
void AnimationTimeline::updateCSSAnimationsForElement(Element& element, const RenderStyle* currentStyle, const RenderStyle& newStyle)
{
auto& keyframeEffectStack = element.ensureKeyframeEffectStack();
// In case this element is newly getting a "display: none" we need to cancel all of its animations and disregard new ones.
if (currentStyle && currentStyle->display() != DisplayType::None && newStyle.display() == DisplayType::None) {
for (auto& cssAnimation : element.animationsCreatedByMarkup())
cssAnimation->cancelFromStyle();
keyframeEffectStack.setCSSAnimationList(nullptr);
return;
}
auto* currentAnimationList = newStyle.animations();
auto* previousAnimationList = keyframeEffectStack.cssAnimationList();
if (previousAnimationList && !previousAnimationList->isEmpty() && newStyle.hasAnimations() && *(previousAnimationList) == *(newStyle.animations()))
return;
CSSAnimationCollection newAnimations;
auto& previousAnimations = element.animationsCreatedByMarkup();
// https://www.w3.org/TR/css-animations-1/#animations
// The same @keyframes rule name may be repeated within an animation-name. Changes to the animation-name update existing
// animations by iterating over the new list of animations from last to first, and, for each animation, finding the last
// matching animation in the list of existing animations. If a match is found, the existing animation is updated using the
// animation properties corresponding to its position in the new list of animations, whilst maintaining its current playback
// time as described above. The matching animation is removed from the existing list of animations such that it will not match
// twice. If a match is not found, a new animation is created. As a result, updating animation-name from ‘a’ to ‘a, a’ will
// cause the existing animation for ‘a’ to become the second animation in the list and a new animation will be created for the
// first item in the list.
if (currentAnimationList) {
for (size_t i = currentAnimationList->size(); i > 0; --i) {
auto& currentAnimation = currentAnimationList->animation(i - 1);
if (!shouldConsiderAnimation(element, currentAnimation))
continue;
bool foundMatchingAnimation = false;
for (auto& previousAnimation : previousAnimations) {
if (previousAnimation->animationName() == currentAnimation.name()) {
// Timing properties or play state may have changed so we need to update the backing animation with
// the Animation found in the current style.
previousAnimation->setBackingAnimation(currentAnimation);
newAnimations.add(previousAnimation);
// Remove the matched animation from the list of previous animations so we may not match it again.
previousAnimations.remove(previousAnimation);
foundMatchingAnimation = true;
break;
}
}
if (!foundMatchingAnimation)
newAnimations.add(CSSAnimation::create(element, currentAnimation, currentStyle, newStyle));
}
}
// Any animation found in previousAnimations but not found in newAnimations is not longer current and should be canceled.
for (auto& previousAnimation : previousAnimations) {
if (!newAnimations.contains(previousAnimation)) {
if (previousAnimation->owningElement())
previousAnimation->cancelFromStyle();
}
}
element.setAnimationsCreatedByMarkup(WTFMove(newAnimations));
keyframeEffectStack.setCSSAnimationList(currentAnimationList);
}
static KeyframeEffect* keyframeEffectForElementAndProperty(Element& element, CSSPropertyID property)
{
if (auto* keyframeEffectStack = element.keyframeEffectStack()) {
auto effects = keyframeEffectStack->sortedEffects();
for (const auto& effect : makeReversedRange(effects)) {
if (effect->animatesProperty(property))
return effect.get();
}
}
return nullptr;
}
static bool propertyInStyleMatchesValueForTransitionInMap(CSSPropertyID property, const RenderStyle& style, PropertyToTransitionMap& transitions)
{
if (auto* transition = transitions.get(property)) {
if (CSSPropertyAnimation::propertiesEqual(property, &style, &transition->targetStyle()))
return true;
}
return false;
}
static double transitionCombinedDuration(const Animation* transition)
{
return std::max(0.0, transition->duration()) + transition->delay();
}
static bool transitionMatchesProperty(const Animation& transition, CSSPropertyID property)
{
auto mode = transition.property().mode;
if (mode == Animation::TransitionMode::None || mode == Animation::TransitionMode::UnknownProperty)
return false;
if (mode == Animation::TransitionMode::SingleProperty) {
auto transitionProperty = transition.property().id;
if (transitionProperty != property) {
for (auto longhand : shorthandForProperty(transitionProperty)) {
if (longhand == property)
return true;
}
return false;
}
}
return true;
}
static void compileTransitionPropertiesInStyle(const RenderStyle& style, HashSet<CSSPropertyID>& transitionProperties, bool& transitionPropertiesContainAll)
{
if (transitionPropertiesContainAll)
return;
auto* transitions = style.transitions();
if (!transitions)
return;
for (size_t i = 0; i < transitions->size(); ++i) {
const auto& animation = transitions->animation(i);
auto mode = animation.property().mode;
if (mode == Animation::TransitionMode::SingleProperty) {
auto property = animation.property().id;
if (isShorthandCSSProperty(property)) {
for (auto longhand : shorthandForProperty(property))
transitionProperties.add(longhand);
} else if (property != CSSPropertyInvalid)
transitionProperties.add(property);
} else if (mode == Animation::TransitionMode::All) {
transitionPropertiesContainAll = true;
return;
}
}
}
void AnimationTimeline::updateCSSTransitionsForElementAndProperty(Element& element, CSSPropertyID property, const RenderStyle& currentStyle, const RenderStyle& newStyle, const MonotonicTime generationTime)
{
auto* keyframeEffect = keyframeEffectForElementAndProperty(element, property);
auto* animation = keyframeEffect ? keyframeEffect->animation() : nullptr;
bool isDeclarative = animation && is<DeclarativeAnimation>(animation) && downcast<DeclarativeAnimation>(*animation).owningElement() == &element;
if (animation && !isDeclarative)
return;
const Animation* matchingBackingAnimation = nullptr;
if (auto* transitions = newStyle.transitions()) {
for (size_t i = 0; i < transitions->size(); ++i) {
auto& backingAnimation = transitions->animation(i);
if (transitionMatchesProperty(backingAnimation, property))
matchingBackingAnimation = &backingAnimation;
}
}
// A CSS Transition might have completed since the last time animations were updated so we must
// update the running and completed transitions membership in that case.
if (is<CSSTransition>(animation) && element.hasRunningTransitionsForProperty(property) && animation->playState() == WebAnimation::PlayState::Finished) {
element.ensureCompletedTransitionsByProperty().set(property, element.ensureRunningTransitionsByProperty().take(property));
animation = nullptr;
}
// https://drafts.csswg.org/css-transitions-1/#before-change-style
// Define the before-change style as the computed values of all properties on the element as of the previous style change event, except with
// any styles derived from declarative animations such as CSS Transitions, CSS Animations, and SMIL Animations updated to the current time.
auto beforeChangeStyle = [&]() -> const RenderStyle {
if (animation && animation->isRelevant()) {
auto animatedStyle = RenderStyle::clone(currentStyle);
// If a transition has not yet started or started when animations were last updated, use the timeline time at its creation
// as its start time to ensure that it will produce a style with progress > 0.
bool shouldUseTimelineTimeAtCreation = is<CSSTransition>(animation) && (!animation->startTime() || *animation->startTime() == currentTime());
animation->resolve(animatedStyle, shouldUseTimelineTimeAtCreation ? downcast<CSSTransition>(*animation).timelineTimeAtCreation() : WTF::nullopt);
return animatedStyle;
}
// If it exists, use the recorded RenderStyle for this element during a previous call to Style::TreeResolver::createAnimatedElementUpdate().
if (auto* lastStyleChangeEventStyle = element.lastStyleChangeEventStyle())
return RenderStyle::clone(*lastStyleChangeEventStyle);
// If we haven't computed styles from animations for this element, the before-change style is the previously resolved style for this element.
return RenderStyle::clone(currentStyle);
}();
// https://drafts.csswg.org/css-transitions-1/#after-change-style
// Likewise, define the after-change style as the computed values of all properties on the element based on the information known at the start
// of that style change event, but using the computed values of the animation-* properties from the before-change style, excluding any styles
// from CSS Transitions in the computation, and inheriting from the after-change style of the parent. Note that this means the after-change
// style does not differ from the before-change style due to newly created or canceled CSS Animations.
auto afterChangeStyle = [&]() -> const RenderStyle {
if (is<CSSAnimation>(animation) && animation->isRelevant()) {
auto animatedStyle = RenderStyle::clone(newStyle);
animation->resolve(animatedStyle);
return animatedStyle;
}
return RenderStyle::clone(newStyle);
}();
if (!element.hasRunningTransitionsForProperty(property)
&& !CSSPropertyAnimation::propertiesEqual(property, &beforeChangeStyle, &afterChangeStyle)
&& CSSPropertyAnimation::canPropertyBeInterpolated(property, &beforeChangeStyle, &afterChangeStyle)
&& !propertyInStyleMatchesValueForTransitionInMap(property, afterChangeStyle, element.ensureCompletedTransitionsByProperty())
&& matchingBackingAnimation && transitionCombinedDuration(matchingBackingAnimation) > 0) {
// 1. If all of the following are true:
// - the element does not have a running transition for the property,
// - the before-change style is different from and can be interpolated with the after-change style for that property,
// - the element does not have a completed transition for the property or the end value of the completed transition is different from the after-change style for the property,
// - there is a matching transition-property value, and
// - the combined duration is greater than 0s,
// then implementations must remove the completed transition (if present) from the set of completed transitions
element.ensureCompletedTransitionsByProperty().remove(property);
// and start a transition whose:
// - start time is the time of the style change event plus the matching transition delay,
// - end time is the start time plus the matching transition duration,
// - start value is the value of the transitioning property in the before-change style,
// - end value is the value of the transitioning property in the after-change style,
// - reversing-adjusted start value is the same as the start value, and
// - reversing shortening factor is 1.
auto delay = Seconds(matchingBackingAnimation->delay());
auto duration = Seconds(matchingBackingAnimation->duration());
auto& reversingAdjustedStartStyle = beforeChangeStyle;
auto reversingShorteningFactor = 1;
element.ensureRunningTransitionsByProperty().set(property, CSSTransition::create(element, property, generationTime, *matchingBackingAnimation, &beforeChangeStyle, afterChangeStyle, delay, duration, reversingAdjustedStartStyle, reversingShorteningFactor));
} else if (element.hasCompletedTransitionsForProperty(property) && !propertyInStyleMatchesValueForTransitionInMap(property, afterChangeStyle, element.ensureCompletedTransitionsByProperty())) {
// 2. Otherwise, if the element has a completed transition for the property and the end value of the completed transition is different from
// the after-change style for the property, then implementations must remove the completed transition from the set of completed transitions.
element.ensureCompletedTransitionsByProperty().remove(property);
}
bool hasRunningTransition = element.hasRunningTransitionsForProperty(property);
if ((hasRunningTransition || element.hasCompletedTransitionsForProperty(property)) && !matchingBackingAnimation) {
// 3. If the element has a running transition or completed transition for the property, and there is not a matching transition-property
// value, then implementations must cancel the running transition or remove the completed transition from the set of completed transitions.
if (hasRunningTransition)
element.ensureRunningTransitionsByProperty().take(property)->cancel();
else
element.ensureCompletedTransitionsByProperty().remove(property);
}
if (matchingBackingAnimation && element.hasRunningTransitionsForProperty(property) && !propertyInStyleMatchesValueForTransitionInMap(property, afterChangeStyle, element.ensureRunningTransitionsByProperty())) {
auto previouslyRunningTransition = element.ensureRunningTransitionsByProperty().take(property);
auto& previouslyRunningTransitionCurrentStyle = previouslyRunningTransition->currentStyle();
// 4. If the element has a running transition for the property, there is a matching transition-property value, and the end value of the running
// transition is not equal to the value of the property in the after-change style, then:
if (CSSPropertyAnimation::propertiesEqual(property, &previouslyRunningTransitionCurrentStyle, &afterChangeStyle) || !CSSPropertyAnimation::canPropertyBeInterpolated(property, &currentStyle, &afterChangeStyle)) {
// 1. If the current value of the property in the running transition is equal to the value of the property in the after-change style,
// or if these two values cannot be interpolated, then implementations must cancel the running transition.
previouslyRunningTransition->cancelFromStyle();
} else if (transitionCombinedDuration(matchingBackingAnimation) <= 0.0 || !CSSPropertyAnimation::canPropertyBeInterpolated(property, &previouslyRunningTransitionCurrentStyle, &afterChangeStyle)) {
// 2. Otherwise, if the combined duration is less than or equal to 0s, or if the current value of the property in the running transition
// cannot be interpolated with the value of the property in the after-change style, then implementations must cancel the running transition.
previouslyRunningTransition->cancelFromStyle();
} else if (CSSPropertyAnimation::propertiesEqual(property, &previouslyRunningTransition->reversingAdjustedStartStyle(), &afterChangeStyle)) {
// 3. Otherwise, if the reversing-adjusted start value of the running transition is the same as the value of the property in the after-change
// style (see the section on reversing of transitions for why these case exists), implementations must cancel the running transition
previouslyRunningTransition->cancelFromStyle();
// and start a new transition whose:
// - reversing-adjusted start value is the end value of the running transition,
// - reversing shortening factor is the absolute value, clamped to the range [0, 1], of the sum of:
// 1. the output of the timing function of the old transition at the time of the style change event, times the reversing shortening factor of the old transition
// 2. 1 minus the reversing shortening factor of the old transition.
// - start time is the time of the style change event plus:
// 1. if the matching transition delay is nonnegative, the matching transition delay, or
// 2. if the matching transition delay is negative, the product of the new transition’s reversing shortening factor and the matching transition delay,
// - end time is the start time plus the product of the matching transition duration and the new transition’s reversing shortening factor,
// - start value is the current value of the property in the running transition,
// - end value is the value of the property in the after-change style
auto& reversingAdjustedStartStyle = previouslyRunningTransition->targetStyle();
double transformedProgress = 1;
if (auto* effect = previouslyRunningTransition->effect()) {
if (auto computedTimingProgress = effect->getComputedTiming().progress)
transformedProgress = *computedTimingProgress;
}
auto reversingShorteningFactor = std::max(std::min(((transformedProgress * previouslyRunningTransition->reversingShorteningFactor()) + (1 - previouslyRunningTransition->reversingShorteningFactor())), 1.0), 0.0);
auto delay = matchingBackingAnimation->delay() < 0 ? Seconds(matchingBackingAnimation->delay()) * reversingShorteningFactor : Seconds(matchingBackingAnimation->delay());
auto duration = Seconds(matchingBackingAnimation->duration()) * reversingShorteningFactor;
element.ensureRunningTransitionsByProperty().set(property, CSSTransition::create(element, property, generationTime, *matchingBackingAnimation, &previouslyRunningTransitionCurrentStyle, afterChangeStyle, delay, duration, reversingAdjustedStartStyle, reversingShorteningFactor));
} else {
// 4. Otherwise, implementations must cancel the running transition
previouslyRunningTransition->cancelFromStyle();
// and start a new transition whose:
// - start time is the time of the style change event plus the matching transition delay,
// - end time is the start time plus the matching transition duration,
// - start value is the current value of the property in the running transition,
// - end value is the value of the property in the after-change style,
// - reversing-adjusted start value is the same as the start value, and
// - reversing shortening factor is 1.
auto delay = Seconds(matchingBackingAnimation->delay());
auto duration = Seconds(matchingBackingAnimation->duration());
auto& reversingAdjustedStartStyle = currentStyle;
auto reversingShorteningFactor = 1;
element.ensureRunningTransitionsByProperty().set(property, CSSTransition::create(element, property, generationTime, *matchingBackingAnimation, &previouslyRunningTransitionCurrentStyle, afterChangeStyle, delay, duration, reversingAdjustedStartStyle, reversingShorteningFactor));
}
}
}
void AnimationTimeline::updateCSSTransitionsForElement(Element& element, const RenderStyle& currentStyle, const RenderStyle& newStyle)
{
// In case this element is newly getting a "display: none" we need to cancel all of its transitions and disregard new ones.
if (currentStyle.hasTransitions() && currentStyle.display() != DisplayType::None && newStyle.display() == DisplayType::None) {
if (element.hasRunningTransitions()) {
auto runningTransitions = element.ensureRunningTransitionsByProperty();
for (const auto& cssTransitionsByCSSPropertyIDMapItem : runningTransitions)
cssTransitionsByCSSPropertyIDMapItem.value->cancelFromStyle();
}
return;
}
// Section 3 "Starting of transitions" from the CSS Transitions Level 1 specification.
// https://drafts.csswg.org/css-transitions-1/#starting
auto generationTime = MonotonicTime::now();
// First, let's compile the list of all CSS properties found in the current style and the after-change style.
bool transitionPropertiesContainAll = false;
HashSet<CSSPropertyID> transitionProperties;
compileTransitionPropertiesInStyle(currentStyle, transitionProperties, transitionPropertiesContainAll);
compileTransitionPropertiesInStyle(newStyle, transitionProperties, transitionPropertiesContainAll);
if (transitionPropertiesContainAll) {
auto numberOfProperties = CSSPropertyAnimation::getNumProperties();
for (int propertyIndex = 0; propertyIndex < numberOfProperties; ++propertyIndex) {
Optional<bool> isShorthand;
auto property = CSSPropertyAnimation::getPropertyAtIndex(propertyIndex, isShorthand);
if (isShorthand && *isShorthand)
continue;
updateCSSTransitionsForElementAndProperty(element, property, currentStyle, newStyle, generationTime);
}
return;
}
for (auto property : transitionProperties)
updateCSSTransitionsForElementAndProperty(element, property, currentStyle, newStyle, generationTime);
}
} // namespace WebCore