Diff
Modified: trunk/Source/WebCore/ChangeLog (169409 => 169410)
--- trunk/Source/WebCore/ChangeLog 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/ChangeLog 2014-05-28 04:44:54 UTC (rev 169410)
@@ -1,5 +1,40 @@
2014-05-27 Simon Fraser <simon.fra...@apple.com>
+ Do some renaming in the scrolling tree
+ https://bugs.webkit.org/show_bug.cgi?id=133333
+
+ Reviewed by Tim Horton.
+
+ Rename ScrollingTreeNode::parentScrollPositionDidChange() to updateLayersAfterAncestorChange()
+ since this goes deep and to indicate that it's about layer updating.
+
+ Also rename the "viewportRect" parameter to "fixedPositionRect", since on iOS
+ this is the custom fixed-position rect that changes on zooming.
+
+ * page/scrolling/ScrollingTree.cpp:
+ (WebCore::ScrollingTree::viewportChangedViaDelegatedScrolling):
+ * page/scrolling/ScrollingTree.h:
+ * page/scrolling/ScrollingTreeFrameScrollingNode.h:
+ * page/scrolling/ScrollingTreeNode.h:
+ * page/scrolling/ScrollingTreeScrollingNode.h:
+ * page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.h:
+ * page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.mm:
+ (WebCore::ScrollingTreeFrameScrollingNodeIOS::updateLayersAfterViewportChange):
+ (WebCore::ScrollingTreeFrameScrollingNodeIOS::updateChildNodesAfterScroll):
+ * page/scrolling/mac/ScrollingTreeFixedNode.h:
+ * page/scrolling/mac/ScrollingTreeFixedNode.mm:
+ (WebCore::ScrollingTreeFixedNode::updateLayersAfterAncestorChange):
+ (WebCore::ScrollingTreeFixedNode::parentScrollPositionDidChange): Deleted.
+ * page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.h:
+ * page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.mm:
+ (WebCore::ScrollingTreeFrameScrollingNodeMac::setScrollLayerPosition):
+ * page/scrolling/mac/ScrollingTreeStickyNode.h:
+ * page/scrolling/mac/ScrollingTreeStickyNode.mm:
+ (WebCore::ScrollingTreeStickyNode::updateLayersAfterAncestorChange):
+ (WebCore::ScrollingTreeStickyNode::parentScrollPositionDidChange): Deleted.
+
+2014-05-27 Simon Fraser <simon.fra...@apple.com>
+
Instantiate a ScrollingTreeMac on Mac
https://bugs.webkit.org/show_bug.cgi?id=133332
Modified: trunk/Source/WebCore/page/scrolling/ScrollingTree.cpp (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/ScrollingTree.cpp 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/ScrollingTree.cpp 2014-05-28 04:44:54 UTC (rev 169410)
@@ -98,7 +98,7 @@
m_rootNode->handleWheelEvent(wheelEvent);
}
-void ScrollingTree::viewportChangedViaDelegatedScrolling(ScrollingNodeID nodeID, const WebCore::FloatRect& viewportRect, double scale)
+void ScrollingTree::viewportChangedViaDelegatedScrolling(ScrollingNodeID nodeID, const WebCore::FloatRect& fixedPositionRect, double scale)
{
ScrollingTreeNode* node = nodeForID(nodeID);
if (!node)
@@ -107,7 +107,7 @@
if (!node->isScrollingNode())
return;
- toScrollingTreeScrollingNode(node)->updateLayersAfterViewportChange(viewportRect, scale);
+ toScrollingTreeScrollingNode(node)->updateLayersAfterViewportChange(fixedPositionRect, scale);
}
void ScrollingTree::scrollPositionChangedViaDelegatedScrolling(ScrollingNodeID nodeID, const WebCore::FloatPoint& scrollPosition, bool inUserInteration)
Modified: trunk/Source/WebCore/page/scrolling/ScrollingTree.h (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/ScrollingTree.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/ScrollingTree.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -80,7 +80,7 @@
// Delegated scrolling/zooming has caused the viewport to change, so update viewport-constrained layers
// (but don't cause scroll events to be fired).
- virtual void viewportChangedViaDelegatedScrolling(ScrollingNodeID, const WebCore::FloatRect& viewportRect, double scale);
+ virtual void viewportChangedViaDelegatedScrolling(ScrollingNodeID, const WebCore::FloatRect& fixedPositionRect, double scale);
// Delegated scrolling has scrolled a node. Update layer positions on descendant tree nodes,
// and call scrollingTreeNodeDidScroll().
Modified: trunk/Source/WebCore/page/scrolling/ScrollingTreeFrameScrollingNode.h (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/ScrollingTreeFrameScrollingNode.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/ScrollingTreeFrameScrollingNode.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -43,13 +43,13 @@
virtual void updateBeforeChildren(const ScrollingStateNode&) override;
// FIXME: We should implement this when we support ScrollingTreeScrollingNodes as children.
- virtual void parentScrollPositionDidChange(const FloatRect& /*viewportRect*/, const FloatSize& /*cumulativeDelta*/) override { }
+ virtual void updateLayersAfterAncestorChange(const ScrollingTreeNode& /*changedNode*/, const FloatRect& /*fixedPositionRect*/, const FloatSize& /*cumulativeDelta*/) override { }
virtual void handleWheelEvent(const PlatformWheelEvent&) = 0;
virtual void setScrollPosition(const FloatPoint&);
virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&) = 0;
- virtual void updateLayersAfterViewportChange(const FloatRect& viewportRect, double scale) = 0;
+ virtual void updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double scale) = 0;
virtual void updateLayersAfterDelegatedScroll(const FloatPoint&) { }
SynchronousScrollingReasons synchronousScrollingReasons() const { return m_synchronousScrollingReasons; }
Modified: trunk/Source/WebCore/page/scrolling/ScrollingTreeNode.h (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/ScrollingTreeNode.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/ScrollingTreeNode.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -55,7 +55,7 @@
virtual void updateBeforeChildren(const ScrollingStateNode&) = 0;
virtual void updateAfterChildren(const ScrollingStateNode&) { }
- virtual void parentScrollPositionDidChange(const FloatRect& viewportRect, const FloatSize& cumulativeDelta) = 0;
+ virtual void updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta) = 0;
ScrollingTreeNode* parent() const { return m_parent; }
void setParent(ScrollingTreeNode* parent) { m_parent = parent; }
Modified: trunk/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -47,13 +47,13 @@
virtual void updateAfterChildren(const ScrollingStateNode&) override;
// FIXME: We should implement this when we support ScrollingTreeScrollingNodes as children.
- virtual void parentScrollPositionDidChange(const FloatRect& /*viewportRect*/, const FloatSize& /*cumulativeDelta*/) override { }
+ virtual void updateLayersAfterAncestorChange(const ScrollingTreeNode& /*changedNode*/, const FloatRect& /*fixedPositionRect*/, const FloatSize& /*cumulativeDelta*/) override { }
virtual void handleWheelEvent(const PlatformWheelEvent&) = 0;
virtual void setScrollPosition(const FloatPoint&);
virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&);
- virtual void updateLayersAfterViewportChange(const FloatRect& viewportRect, double scale) = 0;
+ virtual void updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double scale) = 0;
virtual void updateLayersAfterDelegatedScroll(const FloatPoint&) { }
protected:
Modified: trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.h (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -51,7 +51,7 @@
virtual FloatPoint scrollPosition() const override;
virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&) override;
- virtual void updateLayersAfterViewportChange(const FloatRect& viewportRect, double scale);
+ virtual void updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double scale);
virtual void updateLayersAfterDelegatedScroll(const FloatPoint&) override;
virtual void setScrollLayerPosition(const FloatPoint&) override;
Modified: trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.mm (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.mm 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.mm 2014-05-28 04:44:54 UTC (rev 169410)
@@ -126,16 +126,17 @@
updateChildNodesAfterScroll(scrollPosition);
}
-void ScrollingTreeFrameScrollingNodeIOS::updateLayersAfterViewportChange(const FloatRect& viewportRect, double /*scale*/)
+void ScrollingTreeFrameScrollingNodeIOS::updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double /*scale*/)
{
- [m_counterScrollingLayer setPosition:viewportRect.location()];
+ // Note: we never currently have a m_counterScrollingLayer (which is used for background-attachment:fixed) on iOS.
+ [m_counterScrollingLayer setPosition:fixedPositionRect.location()];
if (!m_children)
return;
size_t size = m_children->size();
for (size_t i = 0; i < size; ++i)
- m_children->at(i)->parentScrollPositionDidChange(viewportRect, FloatSize());
+ m_children->at(i)->updateLayersAfterAncestorChange(*this, fixedPositionRect, FloatSize());
}
void ScrollingTreeFrameScrollingNodeIOS::updateLayersAfterDelegatedScroll(const FloatPoint& scrollPosition)
@@ -169,14 +170,14 @@
if (!m_children)
return;
-
+
viewportRect.setLocation(scrollOffset);
-
+
FloatRect viewportConstrainedObjectsRect = FrameView::rectForViewportConstrainedObjects(enclosingLayoutRect(viewportRect), roundedLayoutSize(totalContentsSize()), frameScaleFactor(), false, behaviorForFixed);
-
+
size_t size = m_children->size();
for (size_t i = 0; i < size; ++i)
- m_children->at(i)->parentScrollPositionDidChange(viewportConstrainedObjectsRect, FloatSize());
+ m_children->at(i)->updateLayersAfterAncestorChange(*this, fixedPositionRect, FloatSize());
}
FloatPoint ScrollingTreeFrameScrollingNodeIOS::minimumScrollPosition() const
Modified: trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFixedNode.h (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFixedNode.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFixedNode.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -48,7 +48,7 @@
ScrollingTreeFixedNode(ScrollingTree&, ScrollingNodeID);
virtual void updateBeforeChildren(const ScrollingStateNode&) override;
- virtual void parentScrollPositionDidChange(const FloatRect& viewportRect, const FloatSize& cumulativeDelta) override;
+ virtual void updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta) override;
FixedPositionViewportConstraints m_constraints;
RetainPtr<CALayer> m_layer;
Modified: trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFixedNode.mm (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFixedNode.mm 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFixedNode.mm 2014-05-28 04:44:54 UTC (rev 169410)
@@ -64,9 +64,9 @@
return CGPointMake(a.x * b.width, a.y * b.height);
}
-void ScrollingTreeFixedNode::parentScrollPositionDidChange(const FloatRect& viewportRect, const FloatSize& cumulativeDelta)
+void ScrollingTreeFixedNode::updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta)
{
- FloatPoint layerPosition = m_constraints.layerPositionForViewportRect(viewportRect);
+ FloatPoint layerPosition = m_constraints.layerPositionForViewportRect(fixedPositionRect);
layerPosition -= cumulativeDelta;
CGRect layerBounds = [m_layer.get() bounds];
@@ -81,7 +81,7 @@
size_t size = m_children->size();
for (size_t i = 0; i < size; ++i)
- m_children->at(i)->parentScrollPositionDidChange(viewportRect, newDelta);
+ m_children->at(i)->updateLayersAfterAncestorChange(changedNode, fixedPositionRect, newDelta);
}
} // namespace WebCore
Modified: trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.h (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -69,7 +69,7 @@
virtual void setScrollPosition(const FloatPoint&) override;
virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&) override;
- virtual void updateLayersAfterViewportChange(const FloatRect& viewportRect, double scale) override;
+ virtual void updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double scale) override;
virtual void setScrollLayerPosition(const FloatPoint&) override;
Modified: trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.mm (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.mm 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.mm 2014-05-28 04:44:54 UTC (rev 169410)
@@ -349,7 +349,6 @@
FloatPoint scrollOffset = position - toFloatSize(scrollOrigin());
FloatRect viewportRect(FloatPoint(), scrollableAreaSize());
- // FIXME: scrollOffsetForFixedPosition() needs to do float math.
FloatSize scrollOffsetForFixedChildren = FrameView::scrollOffsetForFixedPosition(enclosingLayoutRect(viewportRect),
roundedLayoutSize(totalContentsSize()), roundedLayoutPoint(scrollOffset), scrollOrigin(), frameScaleFactor(), false, behaviorForFixed, headerHeight(), footerHeight());
@@ -410,7 +409,7 @@
size_t size = m_children->size();
for (size_t i = 0; i < size; ++i)
- m_children->at(i)->parentScrollPositionDidChange(viewportRect, FloatSize());
+ m_children->at(i)->updateLayersAfterAncestorChange(*this, viewportRect, FloatSize());
}
void ScrollingTreeFrameScrollingNodeMac::updateLayersAfterViewportChange(const FloatRect&, double)
Modified: trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.h (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -48,7 +48,7 @@
ScrollingTreeStickyNode(ScrollingTree&, ScrollingNodeID);
virtual void updateBeforeChildren(const ScrollingStateNode&) override;
- virtual void parentScrollPositionDidChange(const FloatRect& viewportRect, const FloatSize& cumulativeDelta) override;
+ virtual void updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta) override;
StickyPositionViewportConstraints m_constraints;
RetainPtr<CALayer> m_layer;
Modified: trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm (169409 => 169410)
--- trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm 2014-05-28 04:44:54 UTC (rev 169410)
@@ -64,9 +64,9 @@
return CGPointMake(a.x * b.width, a.y * b.height);
}
-void ScrollingTreeStickyNode::parentScrollPositionDidChange(const FloatRect& viewportRect, const FloatSize& cumulativeDelta)
+void ScrollingTreeStickyNode::updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta)
{
- FloatPoint layerPosition = m_constraints.layerPositionForConstrainingRect(viewportRect);
+ FloatPoint layerPosition = m_constraints.layerPositionForConstrainingRect(fixedPositionRect);
// FIXME: Subtracting the cumulativeDelta is not totally sufficient to get the new position right for nested
// sticky objects. We probably need a way to modify the containingBlockRect in the ViewportContraints
@@ -85,7 +85,7 @@
size_t size = m_children->size();
for (size_t i = 0; i < size; ++i)
- m_children->at(i)->parentScrollPositionDidChange(viewportRect, newDelta);
+ m_children->at(i)->updateLayersAfterAncestorChange(changedNode, fixedPositionRect, newDelta);
}
} // namespace WebCore
Modified: trunk/Source/WebKit2/ChangeLog (169409 => 169410)
--- trunk/Source/WebKit2/ChangeLog 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebKit2/ChangeLog 2014-05-28 04:44:54 UTC (rev 169410)
@@ -1,3 +1,22 @@
+2014-05-27 Simon Fraser <simon.fra...@apple.com>
+
+ Do some renaming in the scrolling tree
+ https://bugs.webkit.org/show_bug.cgi?id=133333
+
+ Reviewed by Tim Horton.
+
+ Rename ScrollingTreeNode::parentScrollPositionDidChange() to updateLayersAfterAncestorChange()
+ since this goes deep and to indicate that it's about layer updating.
+
+ Also rename the "viewportRect" parameter to "fixedPositionRect", since on iOS
+ this is the custom fixed-position rect that changes on zooming.
+
+ * UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp:
+ (WebKit::RemoteScrollingCoordinatorProxy::viewportChangedViaDelegatedScrolling):
+ * UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h:
+ * UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h:
+ (WebKit::ScrollingTreeOverflowScrollingNodeIOS::updateLayersAfterViewportChange):
+
2014-05-27 Geoffrey Garen <gga...@apple.com>
Some proof-reading of the WebKit2 API headerdoc
Modified: trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp (169409 => 169410)
--- trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp 2014-05-28 04:44:54 UTC (rev 169410)
@@ -154,9 +154,9 @@
return m_scrollingTree->isPointInNonFastScrollableRegion(p);
}
-void RemoteScrollingCoordinatorProxy::viewportChangedViaDelegatedScrolling(ScrollingNodeID nodeID, const FloatRect& viewportRect, double scale)
+void RemoteScrollingCoordinatorProxy::viewportChangedViaDelegatedScrolling(ScrollingNodeID nodeID, const FloatRect& fixedPositionRect, double scale)
{
- m_scrollingTree->viewportChangedViaDelegatedScrolling(nodeID, viewportRect, scale);
+ m_scrollingTree->viewportChangedViaDelegatedScrolling(nodeID, fixedPositionRect, scale);
}
// This comes from the scrolling tree.
Modified: trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h (169409 => 169410)
--- trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -58,7 +58,7 @@
bool isPointInNonFastScrollableRegion(const WebCore::IntPoint&) const;
// Called externally when native views move around.
- void viewportChangedViaDelegatedScrolling(WebCore::ScrollingNodeID, const WebCore::FloatRect& viewportRect, double scale);
+ void viewportChangedViaDelegatedScrolling(WebCore::ScrollingNodeID, const WebCore::FloatRect& fixedPositionRect, double scale);
// FIXME: expose the tree and pass this to that?
bool handleWheelEvent(const WebCore::PlatformWheelEvent&);
Modified: trunk/Source/WebKit2/UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h (169409 => 169410)
--- trunk/Source/WebKit2/UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h 2014-05-28 04:44:51 UTC (rev 169409)
+++ trunk/Source/WebKit2/UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h 2014-05-28 04:44:54 UTC (rev 169410)
@@ -54,7 +54,7 @@
virtual void setScrollLayerPosition(const WebCore::FloatPoint&) override;
- virtual void updateLayersAfterViewportChange(const WebCore::FloatRect& viewportRect, double scale) { }
+ virtual void updateLayersAfterViewportChange(const WebCore::FloatRect& fixedPositionRect, double scale) { }
virtual void handleWheelEvent(const WebCore::PlatformWheelEvent&) override { }
void updateChildNodesAfterScroll(const WebCore::FloatPoint&);
