Refactor Scroll Customization to share cc::ScrollStateData with blink.

third_party/WebKit/Source/core/page/scrolling/ScrollState.h

 // Copyright 2015 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 ScrollState_h
 #define ScrollState_h
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/dom/Element.h"
-#include "public/platform/WebScrollStateData.h"
+#include "platform/scroll/ScrollStateData.h"
+#include <deque>
 
 namespace blink {
 
 class CORE_EXPORT ScrollState final : public RefCountedWillBeGarbageCollectedFinalized<ScrollState>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 
 public:
+    // TODO(tdresser) - the web exposed constructor should have fewer parameters.
     static PassRefPtrWillBeRawPtr<ScrollState> create(
-        double deltaX, double deltaY, double deltaGranularity, double velocityX,
-        double velocityY, bool inInertialPhase,
-        bool isBeginning = false, bool isEnding = false,
-        bool fromUserInput = false, bool shouldPropagate = true,
+        double deltaX, double deltaY, int startPositionX, int startPositionY, double velocityX,
+        double velocityY, bool isBeginning = false, bool inInertialPhase = false,
+        bool isEnding = false, bool shouldPropagate = true, bool fromUserInput = false,
+        bool isDirectManipulation = true, double deltaGranularity = 0,
         bool deltaConsumedForScrollSequence = false);
 
-    static PassRefPtrWillBeRawPtr<ScrollState> create(PassOwnPtr<WebScrollStateData>);
+    static PassRefPtrWillBeRawPtr<ScrollState> create(PassOwnPtr<ScrollStateData>);
 
     ~ScrollState()
     {
     }
 
     // Web exposed methods.
 
     // Reduce deltas by x, y.
     void consumeDelta(double x, double y, ExceptionState&);
     // Pops the first element off of |m_scrollChain| and calls |distributeScroll| on it.
     void distributeToScrollChainDescendant();
+    int startPositionX() { return m_data->start_position_x; };
+    int startPositionY() { return m_data->start_position_y; };
     // Positive when scrolling left.
-    double deltaX() const { return m_data->deltaX; };
+    double deltaX() const { return m_data->delta_x; };
     // Positive when scrolling up.
-    double deltaY() const { return m_data->deltaY; };
+    double deltaY() const { return m_data->delta_y; };
     // Indicates the smallest delta the input device can produce. 0 for unquantized inputs.
-    double deltaGranularity() const { return m_data->deltaGranularity; };
+    double deltaGranularity() const { return m_data->delta_granularity; };
     // Positive if moving right.
-    double velocityX() const { return m_data->velocityX; };
+    double velocityX() const { return m_data->velocity_x; };
     // Positive if moving down.
-    double velocityY() const { return m_data->velocityY; };
+    double velocityY() const { return m_data->velocity_y; };
     // True for events dispatched after the users's gesture has finished.
-    bool inInertialPhase() const { return m_data->inInertialPhase; };
+    bool inInertialPhase() const { return m_data->is_in_inertial_phase; };
     // True if this is the first event for this scroll.
-    bool isBeginning() const { return m_data->isBeginning; };
+    bool isBeginning() const { return m_data->is_beginning; };
     // True if this is the last event for this scroll.
-    bool isEnding() const { return m_data->isEnding; };
+    bool isEnding() const { return m_data->is_ending; };
     // True if this scroll is the direct result of user input.
-    bool fromUserInput() const { return m_data->fromUserInput; };
+    bool fromUserInput() const { return m_data->from_user_input; };
+    // True if this scroll is the result of the user interacting directly with
+    // the screen, e.g., via touch.
+    bool isDirectManipulation() const { return m_data->is_direct_manipulation; }
     // True if this scroll is allowed to bubble upwards.
-    bool shouldPropagate() const { return m_data->shouldPropagate; };
+    bool shouldPropagate() const { return m_data->should_propagate; };
 
     // Non web exposed methods.
     void consumeDeltaNative(double x, double y);
 
     // TODO(tdresser): this needs to be web exposed. See crbug.com/483091.
     void setScrollChain(std::deque<int> scrollChain)
     {
         m_scrollChain = scrollChain;
     }
 
     Element* currentNativeScrollingElement() const;
     void setCurrentNativeScrollingElement(Element*);
 
-    int currentNativeScrollingElementId() const;
     void setCurrentNativeScrollingElementById(int elementId);
 
     bool deltaConsumedForScrollSequence() const
     {
-        return m_data->deltaConsumedForScrollSequence;
+        return m_data->delta_consumed_for_scroll_sequence;
     }
 
     // Scroll begin and end must propagate to all nodes to ensure
     // their state is updated.
     bool fullyConsumed() const
     {
-        return !m_data->deltaX && !m_data->deltaY && !m_data->isEnding && !m_data->isBeginning;
+        return !m_data->delta_x && !m_data->delta_y && !m_data->is_ending && !m_data->is_beginning;
     }
 
-    // These are only used for CompositorWorker scrolling, and should be gotten
-    // rid of eventually.
-    void setCausedScroll(bool x, bool y)
-    {
-        m_data->causedScrollX = x;
-        m_data->causedScrollY = y;
-    }
-
-    bool causedScrollX() const
-    {
-        return m_data->causedScrollX;
-    }
-
-    bool causedScrollY() const
-    {
-        return m_data->causedScrollY;
-    }
-
-    WebScrollStateData* data() const { return m_data.get(); }
+    ScrollStateData* data() const { return m_data.get(); }
 
     DEFINE_INLINE_TRACE() {}
 
 private:
     ScrollState();
-    ScrollState(PassOwnPtr<WebScrollStateData>);
-    PassOwnPtr<WebScrollStateData> m_data;
+    ScrollState(PassOwnPtr<ScrollStateData>);
+    PassOwnPtr<ScrollStateData> m_data;
     std::deque<int> m_scrollChain;
 };
 
 } // namespace blink
 
 #endif // ScrollState_h