| /* |
| * 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, ¤tStyle, &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 |
