Web Animations: Introduce ActiveAnimations and AnimationStack

Source/core/animation/DocumentTimeline.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
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@@ skipping 13 matching lines @@
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  * 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.
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 #ifndef DocumentTimeline_h
 #define DocumentTimeline_h
 
+#include "core/animation/ActiveAnimations.h"
 #include "core/animation/Player.h"
+#include "core/dom/Element.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class Document;
 class TimedItem;
 
 // DocumentTimeline is constructed and owned by Document, and tied to its lifecycle.
 class DocumentTimeline : public RefCounted<DocumentTimeline> {
 
 public:
     static PassRefPtr<DocumentTimeline> create(Document*);
     void serviceAnimations(double);
     PassRefPtr<Player> play(TimedItem*);
     double currentTime() { return m_currentTime; }
     void pauseAnimationsForTesting(double);
+    AnimationStack* animationStack(const Element* element) const
+    {
+        if (!element->activeAnimations())
+            return 0;
+        return element->activeAnimations()->defaultStack();

[esprehn, 2013/07/23 01:20:38]

if (ActiveAnimations* animations = element->activeAnimations())
  return animations->defaultStack();
return 0;

That pattern is good because if you make activeAnimations more expensive in the
future (ex. hash maps) we don't call it all over.

[dstockwell, 2013/07/23 01:33:00]

Done.

+    }
+    AnimationStack* ensureAnimationStack(Element* element) { return element->ensureActiveAnimations()->defaultStack(); }

[esprehn, 2013/07/23 01:20:38]

Remove this method, just call this directly or put an inline method in your .cpp
file. This certainly doesn't need to be an instance method. :)

[dstockwell, 2013/07/23 01:33:00]

Removed.

The plan was for this to become virtual once there were multiple timelines bound
to different stacks inside ActiveAnimations. But I'll add it back at that point
if necessary.

 
 private:
     DocumentTimeline(Document*);
     double m_currentTime;
     Document* m_document;
     Vector<RefPtr<Player> > m_players;
 };
 
 } // namespace
 
 #endif