| // Copyright 2019 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_CSS_CSS_TRANSITION_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_CSS_CSS_TRANSITION_H_ |
| |
| #include "third_party/blink/renderer/core/animation/animation.h" |
| #include "third_party/blink/renderer/core/animation/animation_effect.h" |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/core/dom/element.h" |
| |
| namespace blink { |
| |
| class CORE_EXPORT CSSTransition : public Animation { |
| DEFINE_WRAPPERTYPEINFO(); |
| |
| public: |
| CSSTransition(ExecutionContext*, |
| AnimationTimeline*, |
| AnimationEffect*, |
| uint64_t transition_generation, |
| const PropertyHandle& transition_property); |
| |
| bool IsCSSTransition() const final { return true; } |
| |
| void ClearOwningElement() final { owning_element_ = nullptr; } |
| Element* OwningElement() const override { return owning_element_; } |
| |
| uint64_t TransitionGeneration() const { return transition_generation_; } |
| AtomicString transitionProperty() const; |
| CSSPropertyName TransitionCSSPropertyName() const { |
| return transition_property_.GetCSSPropertyName(); |
| } |
| |
| // Animation overrides. |
| // Various operations may affect the computed values of properties on |
| // elements. User agents may, as an optimization, defer recomputing these |
| // values until it becomes necessary; however, all operations included in the |
| // programming interfaces defined in the web-animations and css-transitions |
| // specifications, must produce a result consistent with having fully |
| // processed any such pending changes to computed values. Notably, setting |
| // display:none must update the play state. |
| // https://drafts.csswg.org/css-transitions-2/#requirements-on-pending-style-changes |
| String playState() const override; |
| void Trace(blink::Visitor* visitor) const override { |
| Animation::Trace(visitor); |
| visitor->Trace(owning_element_); |
| } |
| |
| protected: |
| AnimationEffect::EventDelegate* CreateEventDelegate( |
| Element* target, |
| const AnimationEffect::EventDelegate* old_event_delegate) override; |
| |
| private: |
| PropertyHandle transition_property_; |
| // The owning element of a transition refers to the element or pseudo-element |
| // to which the transition-property property was applied that generated the |
| // animation. |
| Member<Element> owning_element_; |
| uint64_t transition_generation_; |
| }; |
| template <> |
| struct DowncastTraits<CSSTransition> { |
| static bool AllowFrom(const Animation& animation) { |
| return animation.IsCSSTransition(); |
| } |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_CSS_CSS_TRANSITION_H_ |