Web Animations CSS: Implement CSS Transitions backed on Web Animations model

Source/core/animation/css/CSSAnimations.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 50 matching lines @@
 class CSSAnimationUpdate FINAL {
 public:
     void startAnimation(AtomicString& animationName, const HashSet<RefPtr<InertAnimation> >& animations)
     {
         NewAnimation newAnimation;
         newAnimation.name = animationName;
         newAnimation.animations = animations;
         m_newAnimations.append(newAnimation);
     }
     // Returns whether player has been cancelled and should be filtered during style application.
-    bool isCancelled(const Player* player) const { return m_cancelledAnimationPlayers.contains(player); }
+    bool isCancelledAnimation(const Player* player) const { return m_cancelledAnimationPlayers.contains(player); }

[dstockwell, 2013/10/08 21:02:59]

Not sure why this was renamed. Shouldn't this also check whether a transition
was cancelled?

[Timothy Loh, 2013/10/09 01:33:07]

Transitions and animations are basically disjoint parts of the class, having a
single function to check here seems wrong.

     void cancelAnimation(const AtomicString& name, const HashSet<RefPtr<Player> >& players)
     {
         m_cancelledAnimationNames.append(name);
         for (HashSet<RefPtr<Player> >::const_iterator iter = players.begin(); iter != players.end(); ++iter)
             m_cancelledAnimationPlayers.add(iter->get());
     }
+
+    void startTransition(CSSPropertyID id, PassRefPtr<InertAnimation> animation) { m_newTransitions.set(id, animation); }
+    void endTransition(CSSPropertyID id) { m_endedTransitions.add(id); }

[dstockwell, 2013/10/08 21:02:59]

cancelTransition

[Timothy Loh, 2013/10/09 01:33:07]

This is also used for transitions which finish normally, which I think should be
part of the update object otherwise it's a bit confusing if we remove them in
maybeApplyPendingUpdate.

[dstockwell, 2013/10/09 21:03:51]

I meant that this should just be called cancelTransition

[Timothy Loh, 2013/10/10 02:10:19]

Yeah, I see finishing transitions normally and finishing for other reasons
(changed transition-property / new target) as different, but they fit in the
same bucket. I guess this is OK since animations uses the same naming.

+
     struct NewAnimation {
         AtomicString name;
         HashSet<RefPtr<InertAnimation> > animations;
     };
     const Vector<NewAnimation>& newAnimations() const { return m_newAnimations; }
     const Vector<AtomicString>& cancelledAnimationNames() const { return m_cancelledAnimationNames; }
+    const HashMap<CSSPropertyID, RefPtr<InertAnimation> >& newTransitions() const { return m_newTransitions; }
+    const HashSet<CSSPropertyID>& endedTransitions() const { return m_endedTransitions; }
+
+    bool isEmpty() const
+    {
+        return m_newAnimations.isEmpty()
+            && m_cancelledAnimationNames.isEmpty()
+            && m_cancelledAnimationPlayers.isEmpty()
+            && m_newTransitions.isEmpty()
+            && m_endedTransitions.isEmpty();
+    }
 private:
     // Order is significant since it defines the order in which new animations
     // will be started. Note that there may be multiple animations present
     // with the same name, due to the way in which we split up animations with
     // incomplete keyframes.
     Vector<NewAnimation> m_newAnimations;
     Vector<AtomicString> m_cancelledAnimationNames;
     HashSet<const Player*> m_cancelledAnimationPlayers;
+
+    HashMap<CSSPropertyID, RefPtr<InertAnimation> > m_newTransitions;
+    HashSet<CSSPropertyID> m_endedTransitions;
 };
 
 class CSSAnimations FINAL {
 public:
     static bool isAnimatableProperty(CSSPropertyID);
-    static bool needsUpdate(const Element*, const RenderStyle*);
-    static PassOwnPtr<CSSAnimationUpdate> calculateUpdate(Element*, const RenderStyle*, const CSSAnimations*, const CSSAnimationDataList*, StyleResolver*);
+    static const Vector<CSSPropertyID>& animatableProperties();
+    // FIXME: This should take a const ScopedStyleTree instead of a StyleResolver.
+    // We should also change the Element* to a const Element*
+    static PassOwnPtr<CSSAnimationUpdate> calculateUpdate(Element*, const RenderStyle*, StyleResolver*);
+    static AnimationEffect::CompositableValueMap compositableValuesForTransitions(const CSSAnimations*, const CSSAnimationUpdate*);
+
     void setPendingUpdate(PassOwnPtr<CSSAnimationUpdate> update) { m_pendingUpdate = update; }
     void maybeApplyPendingUpdate(Element*);
-    bool isEmpty() const { return m_animations.isEmpty() && !m_pendingUpdate; }
+    bool isEmpty() const { return m_animations.isEmpty() && m_transitions.isEmpty() && !m_pendingUpdate; }
     void cancel();
 private:
     // Note that a single animation name may map to multiple players due to
     // the way in which we split up animations with incomplete keyframes.
     // FIXME: Once the Web Animations model supports groups, we could use a
     // ParGroup to drive multiple animations from a single Player.
     typedef HashMap<AtomicString, HashSet<RefPtr<Player> > > AnimationMap;
+    typedef HashMap<CSSPropertyID, RefPtr<Player> > TransitionMap;
     AnimationMap m_animations;
+    TransitionMap m_transitions;
     OwnPtr<CSSAnimationUpdate> m_pendingUpdate;
-    class EventDelegate FINAL : public TimedItem::EventDelegate {
+
+    static void updateAnimationUpdate(CSSAnimationUpdate*, Element*, const RenderStyle*, StyleResolver*);
+    static void updateTransitionUpdate(CSSAnimationUpdate*, const Element*, const RenderStyle*);
+    static void updateTransitionUpdate(CSSAnimationUpdate*, CSSPropertyID, const AnimatableValue* from, const AnimatableValue* to, const CSSAnimationData*, const TransitionMap* transitions);
+
+    class AnimationEventDelegate FINAL : public TimedItem::EventDelegate {
     public:
-        EventDelegate(Element* target, const AtomicString& name)
+        AnimationEventDelegate(Element* target, const AtomicString& name)
             : m_target(target)
             , m_name(name)
         {
         }
         virtual void onEventCondition(const TimedItem*, bool isFirstSample, TimedItem::Phase previousPhase, double previousIteration) OVERRIDE;
     private:
         void maybeDispatch(Document::ListenerType, AtomicString& eventName, double elapsedTime);
         Element* m_target;
         const AtomicString m_name;
     };
+
+    class TransitionEventDelegate FINAL : public TimedItem::EventDelegate {
+    public:
+        TransitionEventDelegate(Element* target, CSSPropertyID id)
+            : m_target(target)
+            , m_id(id)
+        {
+        }
+        virtual void onEventCondition(const TimedItem*, bool isFirstSample, TimedItem::Phase previousPhase, double previousIteration) OVERRIDE;
+    private:
+        Element* m_target;
+        const CSSPropertyID m_id;

[Steve Block, 2013/10/09 00:57:12]

Probably better to call this m_property or m_propertyId to make clear it's not
the ID of the event or the target.

[Timothy Loh, 2013/10/09 07:39:23]

Done.

+    };
 };
 
 } // namespace WebCore
 
 #endif