Implement CSSOM Smooth Scroll API

Source/platform/scroll/ProgrammaticScrollAnimator.h

 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2014 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
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "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 THE COPYRIGHT
  * OWNER 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.
  */
 
-#ifndef LinkImport_h
-#define LinkImport_h
+#ifndef ProgrammaticScrollAnimator_h

[Ian Vollick, 2014/02/06 16:02:31]

I think you can muck with --similarity to convince it to treat this as a new
file.

+#define ProgrammaticScrollAnimator_h
 
-#include "core/html/HTMLImportChildClient.h"
-#include "core/html/LinkResource.h"
+#include "platform/geometry/FloatPoint.h"
 #include "wtf/FastAllocBase.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
-#include "wtf/RefPtr.h"
+
+namespace blink {
+class WebScrollOffsetAnimationCurve;
+}
 
 namespace WebCore {
 
-class Document;
-class HTMLImportChild;
+class FloatPoint;
+class ScrollableArea;
 
-//
-// A LinkResource subclasss used for @rel=import.
-//
-class LinkImport FINAL : public LinkResource, public HTMLImportChildClient {
+class ProgrammaticScrollAnimator {
+    WTF_MAKE_NONCOPYABLE(ProgrammaticScrollAnimator);
     WTF_MAKE_FAST_ALLOCATED;
 public:
+    static PassOwnPtr<ProgrammaticScrollAnimator> create(ScrollableArea*);
 
-    static PassOwnPtr<LinkImport> create(HTMLLinkElement* owner);
+    ~ProgrammaticScrollAnimator();
 
-    explicit LinkImport(HTMLLinkElement* owner);
-    virtual ~LinkImport();
+    void animateToOffset(FloatPoint offset);
+    void cancelAnimation();
+    void tickAnimation(double monotonicTime);
 
-    // LinkResource
-    virtual void process() OVERRIDE;
-    virtual Type type() const OVERRIDE { return Import; }
-    virtual void ownerRemoved() OVERRIDE;
-    virtual bool hasLoaded() const OVERRIDE;
+    void notifyAnimationStarted(double monotonicTime);
+    void notifyAnimationFinished(double monotonicTime);
 
-    // HTMLImportChildClient
-    virtual void didFinish() OVERRIDE;
-    virtual void importChildWasDestroyed(HTMLImportChild*) OVERRIDE;
-    virtual bool isCreatedByParser() const OVERRIDE;
-
-    Document* importedDocument() const;
-    bool ownsLoader() const;
+    void canUseCompositedScrollAnimationsDidChange();
 
 private:
-    void clear();
+    explicit ProgrammaticScrollAnimator(ScrollableArea*);
 
-    HTMLImportChild* m_child;
+    void resetAnimationState();
+
+    ScrollableArea* m_scrollableArea;
+    OwnPtr<blink::WebScrollOffsetAnimationCurve> m_animationCurve;
+    FloatPoint m_targetOffset;
+    int m_animationId;
+    double m_startTime;
 };
 
 } // namespace WebCore
 
-#endif // LinkImport_h
+#endif // ScrollAnimator_h