Implement CSSOM Smooth Scroll API

Source/platform/scroll/ProgrammaticScrollAnimator.h

 /*
  * 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
@@ skipping 10 matching lines @@
  * 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 SharedBufferReader_h
-#define SharedBufferReader_h
+#ifndef ProgrammaticScrollAnimator_h
+#define ProgrammaticScrollAnimator_h
 
+#include "platform/geometry/FloatPoint.h"
 #include "wtf/FastAllocBase.h"
-#include "wtf/Forward.h"
-#include "wtf/RefPtr.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
+
+namespace blink {
+class WebScrollOffsetAnimationCurve;
+}
 
 namespace WebCore {
 
-class SharedBuffer;
+class ScrollableArea;
 
-// Allows transfer of data in multiple chunks from a SharedBuffer to a provided buffer.
-class SharedBufferReader {
+class ProgrammaticScrollAnimator {
+    WTF_MAKE_NONCOPYABLE(ProgrammaticScrollAnimator);
     WTF_MAKE_FAST_ALLOCATED;
 public:
-    SharedBufferReader(PassRefPtr<SharedBuffer>);
+    static PassOwnPtr<ProgrammaticScrollAnimator> create(ScrollableArea*);
 
-    ~SharedBufferReader();
+    ~ProgrammaticScrollAnimator();
 
-    // Returns the number of bytes that were read (i.e. written to |outputBuffer|).
-    int readData(char* outputBuffer, unsigned askedToRead);
+    void animateToOffset(FloatPoint);
+    void cancelAnimation();
+    void tickAnimation(double monotonicTime);
+
+    void notifyAnimationStarted(double monotonicTime);
+    void notifyAnimationFinished(double monotonicTime);
+
+    void canUseCompositedScrollAnimationsDidChange();
 
 private:
-    RefPtr<SharedBuffer> m_buffer;
-    unsigned m_currentOffset;
+    explicit ProgrammaticScrollAnimator(ScrollableArea*);
+
+    void resetAnimationState();
+
+    ScrollableArea* m_scrollableArea;
+    OwnPtr<blink::WebScrollOffsetAnimationCurve> m_animationCurve;
+    FloatPoint m_targetOffset;
+    int m_animationId;
+    double m_startTime;
 };
 
 } // namespace WebCore
 
-#endif // SharedBufferReader_h
+#endif // ProgrammaticScrollAnimator_h