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

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

 // 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.
 
 #include "core/page/scrolling/ScrollState.h"
 
 #include "core/dom/DOMNodeIds.h"
 #include "core/dom/Element.h"
 #include "core/dom/ExceptionCode.h"
 
 namespace blink {
 
 namespace {
 Element* elementForId(int elementId)
 {
     Node* node = DOMNodeIds::nodeForId(elementId);
     ASSERT(node);
     if (!node)
         return nullptr;
     ASSERT(node->isElementNode());
     if (!node->isElementNode())
         return nullptr;
     return static_cast<Element*>(node);
 }
 } // namespace
 
 PassRefPtrWillBeRawPtr<ScrollState> ScrollState::create(
-    double deltaX, double deltaY, double deltaGranularity, double velocityX,
-    double velocityY, bool inInertialPhase,
-    bool isBeginning, bool isEnding,
-    bool fromUserInput, bool shouldPropagate,
-    bool deltaConsumedForScrollSequence)
+    double deltaX, double deltaY, int startPositionX, int startPositionY, double velocityX,
+    double velocityY, bool isBeginning, bool inInertialPhase, bool isEnding,
+    bool shouldPropagate, bool fromUserInput, bool isDirectManipulation,
+    double deltaGranularity, bool deltaConsumedForScrollSequence)
 {
-    OwnPtr<WebScrollStateData> data(adoptPtr(new WebScrollStateData(deltaX, deltaY, deltaGranularity, velocityX, velocityY,
-        inInertialPhase, isBeginning, isEnding, fromUserInput, shouldPropagate,
-        deltaConsumedForScrollSequence)));
+    OwnPtr<ScrollStateData> data(adoptPtr(new ScrollStateData(deltaX, deltaY, startPositionX, startPositionY, velocityX, velocityY,
+        isBeginning, inInertialPhase, isEnding, shouldPropagate, fromUserInput,
+        isDirectManipulation, deltaGranularity, deltaConsumedForScrollSequence)));
     return adoptRefWillBeNoop(new ScrollState(data.release()));
 }
 
-PassRefPtrWillBeRawPtr<ScrollState> ScrollState::create(PassOwnPtr<WebScrollStateData> data)
+PassRefPtrWillBeRawPtr<ScrollState> ScrollState::create(PassOwnPtr<ScrollStateData> data)
 {
     ScrollState* scrollState = new ScrollState(data);
     return adoptRefWillBeNoop(scrollState);
 }
 
-ScrollState::ScrollState(PassOwnPtr<WebScrollStateData> data)
+ScrollState::ScrollState(PassOwnPtr<ScrollStateData> data)
     : m_data(data)
 {
 }
 
 void ScrollState::consumeDelta(double x, double y, ExceptionState& exceptionState)
 {
-    if ((m_data->deltaX > 0 && 0 > x) || (m_data->deltaX < 0 && 0 < x) || (m_data->deltaY > 0 && 0 > y) || (m_data->deltaY < 0 && 0 < y)) {
+    if ((m_data->delta_x > 0 && 0 > x) || (m_data->delta_x < 0 && 0 < x) || (m_data->delta_y > 0 && 0 > y) || (m_data->delta_y < 0 && 0 < y)) {
         exceptionState.throwDOMException(InvalidModificationError, "Can't increase delta using consumeDelta");
         return;
     }
-    if (fabs(x) > fabs(m_data->deltaX) || fabs(y) > fabs(m_data->deltaY)) {
+    if (fabs(x) > fabs(m_data->delta_x) || fabs(y) > fabs(m_data->delta_y)) {
         exceptionState.throwDOMException(InvalidModificationError, "Can't change direction of delta using consumeDelta");
         return;
     }
     consumeDeltaNative(x, y);
 }
 
 void ScrollState::distributeToScrollChainDescendant()
 {
     if (!m_scrollChain.empty()) {
         int descendantId = m_scrollChain.front();
         m_scrollChain.pop_front();
         elementForId(descendantId)->callDistributeScroll(*this);
     }
 }
 
 void ScrollState::consumeDeltaNative(double x, double y)
 {
-    m_data->deltaX -= x;
-    m_data->deltaY -= y;
+    m_data->delta_x -= x;
+    m_data->delta_y -= y;
 
+    if (x)
+        m_data->caused_scroll_x = true;
+    if (y)
+        m_data->caused_scroll_y = true;
     if (x || y)
-        m_data->deltaConsumedForScrollSequence = true;
+        m_data->delta_consumed_for_scroll_sequence = true;
 }
 
 Element* ScrollState::currentNativeScrollingElement() const
 {
-    if (m_data->currentNativeScrollingElement == 0)
+    uint64_t elementId = m_data->current_native_scrolling_element();
+    if (elementId == 0)
         return nullptr;
-    return elementForId(m_data->currentNativeScrollingElement);
+    return elementForId(elementId);
 }
 
 void ScrollState::setCurrentNativeScrollingElement(Element* element)
 {
-    m_data->currentNativeScrollingElement = DOMNodeIds::idForNode(element);
-}
-
-int ScrollState::currentNativeScrollingElementId() const
-{
-    return m_data->currentNativeScrollingElement;
+    m_data->set_current_native_scrolling_element(DOMNodeIds::idForNode(element));
 }
 
 void ScrollState::setCurrentNativeScrollingElementById(int elementId)
 {
-    m_data->currentNativeScrollingElement = elementId;
+    m_data->set_current_native_scrolling_element(elementId);
 }
 
 } // namespace blink