Title: [166531] trunk/Source
Revision
166531
Author
[email protected]
Date
2014-03-31 14:23:27 -0700 (Mon, 31 Mar 2014)

Log Message

[iOS WK2] Hook up scroll events for accelerated overflow:scroll
https://bugs.webkit.org/show_bug.cgi?id=130976

Source/WebCore:

Reviewed by Tim Horton.

When an accelerated overflow:scroll is scrolled in the UI process,
tell the WebProcess that the scroll happened to update RenderLayer
state and fire events.

In the WebProcess, RemoteScrollingCoordinator gets a message from the
UI process and calls AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll().
Fixed that function to handle scrolling nodes other than the root, which
required storing a map of ScrollingNodeID->RenderLayer* on RenderLayerCompositor,
accessible through FrameView::scrollableAreaForScrollLayerID().

* WebCore.exp.in:
* page/FrameView.cpp:
(WebCore::FrameView::scrollableAreaForScrollLayerID):
* page/FrameView.h:
* page/scrolling/AsyncScrollingCoordinator.cpp:
(WebCore::AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll): Handle
overflow as well as main frame scrolling nodes.
* page/scrolling/ScrollingTree.cpp:
(WebCore::ScrollingTree::viewportChangedViaDelegatedScrolling): Use isScrollingNode().
(WebCore::ScrollingTree::scrollPositionChangedViaDelegatedScrolling): When an overflow
scroll node was scrolled externally, we have to update layers in decendant nodes,
and then call scrollingTreeNodeDidScroll() which tells the ScrollingCoordinator that
we scrolled.
* page/scrolling/ScrollingTree.h: Try to reduce confusion between the roles played
by these various functions, some of which happen in the UI process with UI-side
compositing.
* page/scrolling/ScrollingTreeScrollingNode.h:
* page/scrolling/ios/ScrollingTreeScrollingNodeIOS.h: Need some functions to be
callable by subclasses.
* page/scrolling/ios/ScrollingTreeScrollingNodeIOS.mm:
(WebCore::ScrollingTreeScrollingNodeIOS::updateLayersAfterDelegatedScroll):
* rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::updateScrollCoordinatedLayer): Add
scrolling layers to the m_scrollingNodeToLayerMap
(WebCore::RenderLayerCompositor::detachScrollCoordinatedLayer): Remove
layer from the m_scrollingNodeToLayerMap.
(WebCore::RenderLayerCompositor::scrollableAreaForScrollLayerID):
* rendering/RenderLayerCompositor.h:

Source/WebKit2:

Reviewed by Tim Horton.

When an accelerated overflow:scroll is scrolled in the UI process,
tell the WebProcess that the scroll happened to update RenderLayer
state and fire events.

Add a WKOverflowScrollViewDelegate which is set as the delegate of
UIScrollViews, owned by ScrollingTreeOverflowScrollingNodeIOS, and propagates
-scrollViewDidScroll: messages to ScrollingTree::scrollPositionChangedViaDelegatedScrolling(),
which updates child layers and then, via RemoteScrollingTree::scrollingTreeNodeDidScroll,
tells the RemoteScrollingCoordinator which sends a message to the WebProcess.

* UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp:
(WebKit::RemoteScrollingCoordinatorProxy::scrollingTreeNodeDidScroll): Name change
to try to reduce confusion.
(WebKit::RemoteScrollingCoordinatorProxy::scrollPositionChanged): Deleted.
* UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h:
* UIProcess/Scrolling/RemoteScrollingTree.cpp:
(WebKit::RemoteScrollingTree::scrollingTreeNodeDidScroll):
* UIProcess/Scrolling/RemoteScrollingTree.h:
* UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h:
* UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.mm:
(-[WKOverflowScrollViewDelegate initWithScrollingTreeNode:WebKit::]):
(-[WKOverflowScrollViewDelegate scrollViewDidScroll:]):
(-[WKOverflowScrollViewDelegate scrollViewWillBeginDragging:]):
(-[WKOverflowScrollViewDelegate scrollViewDidEndDragging:willDecelerate:]):
(-[WKOverflowScrollViewDelegate scrollViewDidEndScrollingAnimation:]):
(WebKit::ScrollingTreeOverflowScrollingNodeIOS::~ScrollingTreeOverflowScrollingNodeIOS):
(WebKit::ScrollingTreeOverflowScrollingNodeIOS::updateBeforeChildren):
(WebKit::ScrollingTreeOverflowScrollingNodeIOS::updateAfterChildren):
(WebKit::ScrollingTreeOverflowScrollingNodeIOS::scrollViewDidScroll):
* WebProcess/Scrolling/RemoteScrollingCoordinator.mm:
(WebKit::RemoteScrollingCoordinator::scrollPositionChangedForNode): No need for
rounding.

Modified Paths

Diff

Modified: trunk/Source/WebCore/ChangeLog (166530 => 166531)


--- trunk/Source/WebCore/ChangeLog	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/ChangeLog	2014-03-31 21:23:27 UTC (rev 166531)
@@ -1,3 +1,49 @@
+2014-03-31  Simon Fraser  <[email protected]>
+
+        [iOS WK2] Hook up scroll events for accelerated overflow:scroll
+        https://bugs.webkit.org/show_bug.cgi?id=130976
+
+        Reviewed by Tim Horton.
+
+        When an accelerated overflow:scroll is scrolled in the UI process,
+        tell the WebProcess that the scroll happened to update RenderLayer
+        state and fire events.
+        
+        In the WebProcess, RemoteScrollingCoordinator gets a message from the
+        UI process and calls AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll().
+        Fixed that function to handle scrolling nodes other than the root, which
+        required storing a map of ScrollingNodeID->RenderLayer* on RenderLayerCompositor,
+        accessible through FrameView::scrollableAreaForScrollLayerID().
+
+        * WebCore.exp.in:
+        * page/FrameView.cpp:
+        (WebCore::FrameView::scrollableAreaForScrollLayerID):
+        * page/FrameView.h:
+        * page/scrolling/AsyncScrollingCoordinator.cpp:
+        (WebCore::AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll): Handle
+        overflow as well as main frame scrolling nodes.
+        * page/scrolling/ScrollingTree.cpp:
+        (WebCore::ScrollingTree::viewportChangedViaDelegatedScrolling): Use isScrollingNode().
+        (WebCore::ScrollingTree::scrollPositionChangedViaDelegatedScrolling): When an overflow
+        scroll node was scrolled externally, we have to update layers in decendant nodes,
+        and then call scrollingTreeNodeDidScroll() which tells the ScrollingCoordinator that
+        we scrolled.
+        * page/scrolling/ScrollingTree.h: Try to reduce confusion between the roles played
+        by these various functions, some of which happen in the UI process with UI-side
+        compositing.
+        * page/scrolling/ScrollingTreeScrollingNode.h:
+        * page/scrolling/ios/ScrollingTreeScrollingNodeIOS.h: Need some functions to be
+        callable by subclasses.
+        * page/scrolling/ios/ScrollingTreeScrollingNodeIOS.mm:
+        (WebCore::ScrollingTreeScrollingNodeIOS::updateLayersAfterDelegatedScroll):
+        * rendering/RenderLayerCompositor.cpp:
+        (WebCore::RenderLayerCompositor::updateScrollCoordinatedLayer): Add
+        scrolling layers to the m_scrollingNodeToLayerMap
+        (WebCore::RenderLayerCompositor::detachScrollCoordinatedLayer): Remove
+        layer from the m_scrollingNodeToLayerMap.
+        (WebCore::RenderLayerCompositor::scrollableAreaForScrollLayerID):
+        * rendering/RenderLayerCompositor.h:
+
 2014-03-31  Antti Koivisto  <[email protected]>
 
         Rename TileCache to LegacyTileCache

Modified: trunk/Source/WebCore/WebCore.exp.in (166530 => 166531)


--- trunk/Source/WebCore/WebCore.exp.in	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/WebCore.exp.in	2014-03-31 21:23:27 UTC (rev 166531)
@@ -2738,6 +2738,7 @@
 __ZN7WebCore13ScrollingTree35shouldHandleWheelEventSynchronouslyERKNS_18PlatformWheelEventE
 __ZN7WebCore13ScrollingTree36viewportChangedViaDelegatedScrollingEyRKNS_9FloatRectEd
 __ZN7WebCore13ScrollingTree37setScrollingPerformanceLoggingEnabledEb
+__ZN7WebCore13ScrollingTree42scrollPositionChangedViaDelegatedScrollingEyRKNS_10FloatPointE
 __ZN7WebCore13ScrollingTreeC2Ev
 __ZN7WebCore13ScrollingTreeD1Ev
 __ZN7WebCore13ScrollingTreeD2Ev
@@ -2801,6 +2802,7 @@
 __ZN7WebCore29ScrollingTreeScrollingNodeIOS19updateAfterChildrenERKNS_18ScrollingStateNodeE
 __ZN7WebCore29ScrollingTreeScrollingNodeIOS20updateBeforeChildrenERKNS_18ScrollingStateNodeE
 __ZN7WebCore29ScrollingTreeScrollingNodeIOS31updateLayersAfterViewportChangeERKNS_9FloatRectEd
+__ZN7WebCore29ScrollingTreeScrollingNodeIOS32updateLayersAfterDelegatedScrollERKNS_10FloatPointE
 __ZN7WebCore29ScrollingTreeScrollingNodeIOS46setScrollPositionWithoutContentEdgeConstraintsERKNS_10FloatPointE
 __ZN7WebCore29ScrollingTreeScrollingNodeIOS6createERNS_13ScrollingTreeENS_17ScrollingNodeTypeEy
 __ZN7WebCore29ScrollingTreeScrollingNodeIOSC2ERNS_13ScrollingTreeENS_17ScrollingNodeTypeEy

Modified: trunk/Source/WebCore/page/FrameView.cpp (166530 => 166531)


--- trunk/Source/WebCore/page/FrameView.cpp	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/page/FrameView.cpp	2014-03-31 21:23:27 UTC (rev 166531)
@@ -817,6 +817,15 @@
     return backing->scrollingNodeID();
 }
 
+ScrollableArea* FrameView::scrollableAreaForScrollLayerID(uint64_t nodeID) const
+{
+    RenderView* renderView = this->renderView();
+    if (!renderView)
+        return nullptr;
+
+    return renderView->compositor().scrollableAreaForScrollLayerID(nodeID);
+}
+
 #if ENABLE(RUBBER_BANDING)
 GraphicsLayer* FrameView::layerForOverhangAreas() const
 {

Modified: trunk/Source/WebCore/page/FrameView.h (166530 => 166531)


--- trunk/Source/WebCore/page/FrameView.h	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/page/FrameView.h	2014-03-31 21:23:27 UTC (rev 166531)
@@ -156,6 +156,7 @@
     // In the future when any ScrollableArea can have a node in th ScrollingTree, this should
     // become a virtual function on ScrollableArea.
     uint64_t scrollLayerID() const;
+    ScrollableArea* scrollableAreaForScrollLayerID(uint64_t) const;
 
     bool hasCompositedContent() const;
     bool hasCompositedContentIncludingDescendants() const;

Modified: trunk/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp (166530 => 166531)


--- trunk/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp	2014-03-31 21:23:27 UTC (rev 166531)
@@ -194,16 +194,17 @@
     if (!frameView)
         return;
 
-    bool oldProgrammaticScroll = frameView->inProgrammaticScroll();
-    frameView->setInProgrammaticScroll(programmaticScroll);
+    // Main frame.
+    if (scrollingNodeID == frameView->scrollLayerID()) {
+        bool oldProgrammaticScroll = frameView->inProgrammaticScroll();
+        frameView->setInProgrammaticScroll(programmaticScroll);
 
-    frameView->setConstrainsScrollingToContentEdge(false);
-    frameView->notifyScrollPositionChanged(roundedIntPoint(scrollPosition));
-    frameView->setConstrainsScrollingToContentEdge(true);
+        frameView->setConstrainsScrollingToContentEdge(false);
+        frameView->notifyScrollPositionChanged(roundedIntPoint(scrollPosition));
+        frameView->setConstrainsScrollingToContentEdge(true);
 
-    frameView->setInProgrammaticScroll(oldProgrammaticScroll);
+        frameView->setInProgrammaticScroll(oldProgrammaticScroll);
 
-    if (scrollingNodeID == frameView->scrollLayerID()) {
         if (GraphicsLayer* scrollLayer = scrollLayerForFrameView(frameView)) {
             GraphicsLayer* counterScrollingLayer = counterScrollingLayerForFrameView(frameView);
             GraphicsLayer* headerLayer = headerLayerForFrameView(frameView);
@@ -231,8 +232,13 @@
                 syncChildPositions(viewportRect);
             }
         }
+
+        return;
     }
-    // FIXME: handle non-main scrolling nodes.
+
+    // Overflow-scroll area.
+    if (ScrollableArea* scrollableArea = frameView->scrollableAreaForScrollLayerID(scrollingNodeID))
+        scrollableArea->scrollToOffsetWithoutAnimation(scrollPosition);
 }
 
 void AsyncScrollingCoordinator::scrollableAreaScrollbarLayerDidChange(ScrollableArea* scrollableArea, ScrollbarOrientation orientation)

Modified: trunk/Source/WebCore/page/scrolling/ScrollingTree.cpp (166530 => 166531)


--- trunk/Source/WebCore/page/scrolling/ScrollingTree.cpp	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/page/scrolling/ScrollingTree.cpp	2014-03-31 21:23:27 UTC (rev 166531)
@@ -104,12 +104,28 @@
     if (!node)
         return;
 
-    if (node->nodeType() != FrameScrollingNode && node->nodeType() != OverflowScrollingNode)
+    if (!node->isScrollingNode())
         return;
 
     toScrollingTreeScrollingNode(node)->updateLayersAfterViewportChange(viewportRect, scale);
 }
 
+void ScrollingTree::scrollPositionChangedViaDelegatedScrolling(ScrollingNodeID nodeID, const WebCore::FloatPoint& scrollPosition)
+{
+    ScrollingTreeNode* node = nodeForID(nodeID);
+    if (!node)
+        return;
+
+    if (node->nodeType() != OverflowScrollingNode)
+        return;
+
+    // Update descendant nodes
+    toScrollingTreeScrollingNode(node)->updateLayersAfterDelegatedScroll(scrollPosition);
+
+    // Update GraphicsLayers and scroll state.
+    scrollingTreeNodeDidScroll(nodeID, scrollPosition);
+}
+
 void ScrollingTree::commitNewTreeState(PassOwnPtr<ScrollingStateTree> scrollingStateTree)
 {
     bool rootStateNodeChanged = scrollingStateTree->hasNewRootStateNode();

Modified: trunk/Source/WebCore/page/scrolling/ScrollingTree.h (166530 => 166531)


--- trunk/Source/WebCore/page/scrolling/ScrollingTree.h	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/page/scrolling/ScrollingTree.h	2014-03-31 21:23:27 UTC (rev 166531)
@@ -63,8 +63,6 @@
     virtual EventResult tryToHandleWheelEvent(const PlatformWheelEvent&) = 0;
     bool shouldHandleWheelEventSynchronously(const PlatformWheelEvent&);
     
-    virtual void viewportChangedViaDelegatedScrolling(ScrollingNodeID, const WebCore::FloatRect& viewportRect, double scale);
-
     void setMainFrameIsRubberBanding(bool);
     bool isRubberBandInProgress();
 
@@ -73,7 +71,18 @@
 
     void setMainFramePinState(bool pinnedToTheLeft, bool pinnedToTheRight, bool pinnedToTheTop, bool pinnedToTheBottom);
 
+    // Called after a scrolling tree node has handled a scroll and updated its layers.
+    // Updates FrameView/RenderLayer scrolling state and GraphicsLayers.
     virtual void scrollingTreeNodeDidScroll(ScrollingNodeID, const FloatPoint& scrollPosition, SetOrSyncScrollingLayerPosition = SyncScrollingLayerPosition) = 0;
+
+    // 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);
+
+    // Delegated scrolling has scrolled a node. Update layer positions on descendant tree nodes,
+    // and call scrollingTreeNodeDidScroll().
+    virtual void scrollPositionChangedViaDelegatedScrolling(ScrollingNodeID, const WebCore::FloatPoint& scrollPosition);
+
     FloatPoint mainFrameScrollPosition();
 
     bool isPointInNonFastScrollableRegion(IntPoint);

Modified: trunk/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h (166530 => 166531)


--- trunk/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h	2014-03-31 21:23:27 UTC (rev 166531)
@@ -54,7 +54,8 @@
     virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&) = 0;
 
     virtual void updateLayersAfterViewportChange(const FloatRect& viewportRect, double scale) = 0;
-    
+    virtual void updateLayersAfterDelegatedScroll(const FloatPoint&) { }
+
     SynchronousScrollingReasons synchronousScrollingReasons() const { return m_synchronousScrollingReasons; }
     bool shouldUpdateScrollLayerPositionSynchronously() const { return m_synchronousScrollingReasons; }
 

Modified: trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeScrollingNodeIOS.h (166530 => 166531)


--- trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeScrollingNodeIOS.h	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeScrollingNodeIOS.h	2014-03-31 21:23:27 UTC (rev 166531)
@@ -50,12 +50,12 @@
 
     CALayer *scrollLayer() const { return m_scrollLayer.get(); }
 
-private:
     FloatPoint scrollPosition() const;
     virtual void setScrollPosition(const FloatPoint&) override;
     virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&) override;
 
     virtual void updateLayersAfterViewportChange(const FloatRect& viewportRect, double scale);
+    virtual void updateLayersAfterDelegatedScroll(const FloatPoint&) override;
 
     void setScrollLayerPosition(const FloatPoint&);
 
@@ -65,6 +65,9 @@
     void scrollBy(const IntSize&);
     void scrollByWithoutContentEdgeConstraints(const IntSize&);
 
+private:
+    void updateChildNodesAfterScroll(const FloatPoint&);
+
     RetainPtr<CALayer> m_scrollLayer;
     RetainPtr<CALayer> m_scrolledContentsLayer;
     RetainPtr<CALayer> m_counterScrollingLayer;

Modified: trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeScrollingNodeIOS.mm (166530 => 166531)


--- trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeScrollingNodeIOS.mm	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/page/scrolling/ios/ScrollingTreeScrollingNodeIOS.mm	2014-03-31 21:23:27 UTC (rev 166531)
@@ -129,16 +129,38 @@
     scrollingTree().scrollingTreeNodeDidScroll(scrollingNodeID(), scrollPosition);
 }
 
-void ScrollingTreeScrollingNodeIOS::setScrollLayerPosition(const FloatPoint& position)
+void ScrollingTreeScrollingNodeIOS::setScrollLayerPosition(const FloatPoint& scrollPosition)
 {
     ASSERT(!shouldUpdateScrollLayerPositionSynchronously());
-    [m_scrollLayer setPosition:CGPointMake(-position.x() + scrollOrigin().x(), -position.y() + scrollOrigin().y())];
+    [m_scrollLayer setPosition:CGPointMake(-scrollPosition.x() + scrollOrigin().x(), -scrollPosition.y() + scrollOrigin().y())];
 
+    updateChildNodesAfterScroll(scrollPosition);
+}
+
+void ScrollingTreeScrollingNodeIOS::updateLayersAfterViewportChange(const FloatRect& viewportRect, double scale)
+{
+    [m_counterScrollingLayer setPosition:viewportRect.location()];
+
+    if (!m_children)
+        return;
+
+    FloatRect viewportConstrainedObjectsRect = FrameView::rectForViewportConstrainedObjects(enclosingLayoutRect(viewportRect), totalContentsSize(), scale, false, scrollBehaviorForFixedElements());
+
+    size_t size = m_children->size();
+    for (size_t i = 0; i < size; ++i)
+        m_children->at(i)->parentScrollPositionDidChange(viewportConstrainedObjectsRect, FloatSize());
+}
+
+void ScrollingTreeScrollingNodeIOS::updateLayersAfterDelegatedScroll(const FloatPoint& scrollPosition)
+{
+    updateChildNodesAfterScroll(scrollPosition());
+}
+
+void ScrollingTreeScrollingNodeIOS::updateChildNodesAfterScroll(const FloatPoint& scrollPosition)
+{
     ScrollBehaviorForFixedElements behaviorForFixed = scrollBehaviorForFixedElements();
-    FloatPoint scrollOffset = position - toIntSize(scrollOrigin());
+    FloatPoint scrollOffset = scrollPosition - toIntSize(scrollOrigin());
     FloatRect viewportRect(FloatPoint(), viewportSize());
-    
-    // FIXME: scrollOffsetForFixedPosition() needs to do float math.
     FloatSize scrollOffsetForFixedChildren = FrameView::scrollOffsetForFixedPosition(enclosingLayoutRect(viewportRect), totalContentsSize(), flooredIntPoint(scrollOffset), scrollOrigin(), frameScaleFactor(), false, behaviorForFixed, headerHeight(), footerHeight());
 
     [m_counterScrollingLayer setPosition:FloatPoint(scrollOffsetForFixedChildren)];
@@ -170,20 +192,6 @@
         m_children->at(i)->parentScrollPositionDidChange(viewportConstrainedObjectsRect, FloatSize());
 }
 
-void ScrollingTreeScrollingNodeIOS::updateLayersAfterViewportChange(const FloatRect& viewportRect, double scale)
-{
-    [m_counterScrollingLayer setPosition:viewportRect.location()];
-
-    if (!m_children)
-        return;
-
-    FloatRect viewportConstrainedObjectsRect = FrameView::rectForViewportConstrainedObjects(enclosingLayoutRect(viewportRect), totalContentsSize(), scale, false, scrollBehaviorForFixedElements());
-
-    size_t size = m_children->size();
-    for (size_t i = 0; i < size; ++i)
-        m_children->at(i)->parentScrollPositionDidChange(viewportConstrainedObjectsRect, FloatSize());
-}
-
 FloatPoint ScrollingTreeScrollingNodeIOS::minimumScrollPosition() const
 {
     FloatPoint position;

Modified: trunk/Source/WebCore/rendering/RenderLayerCompositor.cpp (166530 => 166531)


--- trunk/Source/WebCore/rendering/RenderLayerCompositor.cpp	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/rendering/RenderLayerCompositor.cpp	2014-03-31 21:23:27 UTC (rev 166531)
@@ -3515,6 +3515,7 @@
 
         nodeID = scrollingCoordinator->attachToStateTree(isRootLayer ? FrameScrollingNode : OverflowScrollingNode, nodeID, parentNodeID);
         backing->setScrollingNodeID(nodeID);
+        m_scrollingNodeToLayerMap.add(nodeID, &layer);
 
         GraphicsLayer* scrollingLayer = backing->scrollingLayer();
         GraphicsLayer* scrolledContentsLayer = backing->scrollingContentsLayer();
@@ -3537,10 +3538,24 @@
 
 void RenderLayerCompositor::detachScrollCoordinatedLayer(RenderLayer& layer)
 {
-    if (RenderLayerBacking* backing = layer.backing())
-        backing->detachFromScrollingCoordinator();
+    RenderLayerBacking* backing = layer.backing();
+    if (!backing)
+        return;
+
+    backing->detachFromScrollingCoordinator();
+
+    if (ScrollingNodeID nodeID = backing->scrollingNodeID())
+        m_scrollingNodeToLayerMap.remove(nodeID);
 }
 
+ScrollableArea* RenderLayerCompositor::scrollableAreaForScrollLayerID(ScrollingNodeID nodeID) const
+{
+    if (!nodeID)
+        return nullptr;
+
+    return m_scrollingNodeToLayerMap.get(nodeID);
+}
+
 #if PLATFORM(IOS)
 typedef HashMap<PlatformLayer*, std::unique_ptr<ViewportConstraints>> LayerMap;
 typedef HashMap<PlatformLayer*, PlatformLayer*> StickyContainerMap;

Modified: trunk/Source/WebCore/rendering/RenderLayerCompositor.h (166530 => 166531)


--- trunk/Source/WebCore/rendering/RenderLayerCompositor.h	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebCore/rendering/RenderLayerCompositor.h	2014-03-31 21:23:27 UTC (rev 166531)
@@ -266,6 +266,8 @@
     GraphicsLayer* updateLayerForFooter(bool wantsLayer);
 #endif
 
+    ScrollableArea* scrollableAreaForScrollLayerID(ScrollingNodeID) const;
+
     void updateScrollCoordinatedStatus(RenderLayer&);
     void removeFromScrollCoordinatedLayers(RenderLayer&);
 
@@ -519,6 +521,8 @@
 #endif
 
     Color m_rootExtendedBackgroundColor;
+
+    HashMap<ScrollingNodeID, RenderLayer*> m_scrollingNodeToLayerMap;
 };
 
 

Modified: trunk/Source/WebKit2/ChangeLog (166530 => 166531)


--- trunk/Source/WebKit2/ChangeLog	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebKit2/ChangeLog	2014-03-31 21:23:27 UTC (rev 166531)
@@ -1,3 +1,43 @@
+2014-03-31  Simon Fraser  <[email protected]>
+
+        [iOS WK2] Hook up scroll events for accelerated overflow:scroll
+        https://bugs.webkit.org/show_bug.cgi?id=130976
+
+        Reviewed by Tim Horton.
+        
+        When an accelerated overflow:scroll is scrolled in the UI process,
+        tell the WebProcess that the scroll happened to update RenderLayer
+        state and fire events.
+        
+        Add a WKOverflowScrollViewDelegate which is set as the delegate of
+        UIScrollViews, owned by ScrollingTreeOverflowScrollingNodeIOS, and propagates
+        -scrollViewDidScroll: messages to ScrollingTree::scrollPositionChangedViaDelegatedScrolling(),
+        which updates child layers and then, via RemoteScrollingTree::scrollingTreeNodeDidScroll,
+        tells the RemoteScrollingCoordinator which sends a message to the WebProcess.
+        
+        * UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp:
+        (WebKit::RemoteScrollingCoordinatorProxy::scrollingTreeNodeDidScroll): Name change
+        to try to reduce confusion.
+        (WebKit::RemoteScrollingCoordinatorProxy::scrollPositionChanged): Deleted.
+        * UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h:
+        * UIProcess/Scrolling/RemoteScrollingTree.cpp:
+        (WebKit::RemoteScrollingTree::scrollingTreeNodeDidScroll):
+        * UIProcess/Scrolling/RemoteScrollingTree.h:
+        * UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h:
+        * UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.mm:
+        (-[WKOverflowScrollViewDelegate initWithScrollingTreeNode:WebKit::]):
+        (-[WKOverflowScrollViewDelegate scrollViewDidScroll:]):
+        (-[WKOverflowScrollViewDelegate scrollViewWillBeginDragging:]):
+        (-[WKOverflowScrollViewDelegate scrollViewDidEndDragging:willDecelerate:]):
+        (-[WKOverflowScrollViewDelegate scrollViewDidEndScrollingAnimation:]):
+        (WebKit::ScrollingTreeOverflowScrollingNodeIOS::~ScrollingTreeOverflowScrollingNodeIOS):
+        (WebKit::ScrollingTreeOverflowScrollingNodeIOS::updateBeforeChildren):
+        (WebKit::ScrollingTreeOverflowScrollingNodeIOS::updateAfterChildren):
+        (WebKit::ScrollingTreeOverflowScrollingNodeIOS::scrollViewDidScroll):
+        * WebProcess/Scrolling/RemoteScrollingCoordinator.mm:
+        (WebKit::RemoteScrollingCoordinator::scrollPositionChangedForNode): No need for
+        rounding.
+
 2014-03-29  Simon Fraser  <[email protected]>
 
         Fix scrolling on OS X with UI-side compositing

Modified: trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp (166530 => 166531)


--- trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.cpp	2014-03-31 21:23:27 UTC (rev 166531)
@@ -150,7 +150,7 @@
 }
 
 // This comes from the scrolling tree.
-void RemoteScrollingCoordinatorProxy::scrollPositionChanged(WebCore::ScrollingNodeID scrolledNodeID, const WebCore::FloatPoint& newScrollPosition)
+void RemoteScrollingCoordinatorProxy::scrollingTreeNodeDidScroll(WebCore::ScrollingNodeID scrolledNodeID, const WebCore::FloatPoint& newScrollPosition)
 {
     // Scroll updates for the main frame are sent via WebPageProxy::updateVisibleContentRects()
     // so don't send them here.

Modified: trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h (166530 => 166531)


--- trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingCoordinatorProxy.h	2014-03-31 21:23:27 UTC (rev 166531)
@@ -52,7 +52,7 @@
     virtual ~RemoteScrollingCoordinatorProxy();
     
     // Inform the web process that the scroll position changed (called from the scrolling tree)
-    void scrollPositionChanged(WebCore::ScrollingNodeID, const WebCore::FloatPoint& newScrollPosition);
+    void scrollingTreeNodeDidScroll(WebCore::ScrollingNodeID, const WebCore::FloatPoint& newScrollPosition);
 
     bool isPointInNonFastScrollableRegion(const WebCore::IntPoint&) const;
 

Modified: trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingTree.cpp (166530 => 166531)


--- trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingTree.cpp	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingTree.cpp	2014-03-31 21:23:27 UTC (rev 166531)
@@ -79,7 +79,7 @@
 
 void RemoteScrollingTree::scrollingTreeNodeDidScroll(ScrollingNodeID nodeID, const FloatPoint& scrollPosition, SetOrSyncScrollingLayerPosition)
 {
-    m_scrollingCoordinatorProxy.scrollPositionChanged(nodeID, scrollPosition);
+    m_scrollingCoordinatorProxy.scrollingTreeNodeDidScroll(nodeID, scrollPosition);
 }
 
 PassOwnPtr<ScrollingTreeNode> RemoteScrollingTree::createNode(ScrollingNodeType nodeType, ScrollingNodeID nodeID)

Modified: trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingTree.h (166530 => 166531)


--- trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingTree.h	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebKit2/UIProcess/Scrolling/RemoteScrollingTree.h	2014-03-31 21:23:27 UTC (rev 166531)
@@ -46,13 +46,14 @@
 
     const RemoteScrollingCoordinatorProxy& scrollingCoordinatorProxy() const { return m_scrollingCoordinatorProxy; }
 
+    virtual void scrollingTreeNodeDidScroll(WebCore::ScrollingNodeID, const WebCore::FloatPoint& scrollPosition, WebCore::SetOrSyncScrollingLayerPosition = WebCore::SyncScrollingLayerPosition) override;
+
 private:
     explicit RemoteScrollingTree(RemoteScrollingCoordinatorProxy&);
 
 #if PLATFORM(MAC)
     virtual void handleWheelEventPhase(WebCore::PlatformWheelEventPhase) override;
 #endif
-    virtual void scrollingTreeNodeDidScroll(WebCore::ScrollingNodeID, const WebCore::FloatPoint& scrollPosition, WebCore::SetOrSyncScrollingLayerPosition = WebCore::SyncScrollingLayerPosition) override;
 
     virtual PassOwnPtr<WebCore::ScrollingTreeNode> createNode(WebCore::ScrollingNodeType, WebCore::ScrollingNodeID);
     

Modified: trunk/Source/WebKit2/UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h (166530 => 166531)


--- trunk/Source/WebKit2/UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebKit2/UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.h	2014-03-31 21:23:27 UTC (rev 166531)
@@ -32,6 +32,8 @@
 #include <WebCore/ScrollingCoordinator.h>
 #include <WebCore/ScrollingTreeScrollingNodeIOS.h>
 
+OBJC_CLASS WKOverflowScrollViewDelegate;
+
 namespace WebKit {
 
 class ScrollingTreeOverflowScrollingNodeIOS : public WebCore::ScrollingTreeScrollingNodeIOS {
@@ -39,11 +41,15 @@
     static PassOwnPtr<ScrollingTreeOverflowScrollingNodeIOS> create(WebCore::ScrollingTree&, WebCore::ScrollingNodeID);
     virtual ~ScrollingTreeOverflowScrollingNodeIOS();
 
+    void scrollViewDidScroll(const WebCore::FloatPoint&);
+
 private:
     ScrollingTreeOverflowScrollingNodeIOS(WebCore::ScrollingTree&, WebCore::ScrollingNodeID);
 
+    virtual void updateBeforeChildren(const WebCore::ScrollingStateNode&) override;
     virtual void updateAfterChildren(const WebCore::ScrollingStateNode&) override;
 
+    RetainPtr<WKOverflowScrollViewDelegate> m_scrollViewDelegate;
 };
 
 } // namespace WebKit

Modified: trunk/Source/WebKit2/UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.mm (166530 => 166531)


--- trunk/Source/WebKit2/UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.mm	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebKit2/UIProcess/Scrolling/ios/ScrollingTreeOverflowScrollingNodeIOS.mm	2014-03-31 21:23:27 UTC (rev 166531)
@@ -31,10 +31,48 @@
 
 #import <WebCore/BlockExceptions.h>
 #import <WebCore/ScrollingStateScrollingNode.h>
+#import <WebCore/ScrollingTree.h>
 #import <UIKit/UIScrollView.h>
 
 using namespace WebCore;
 
+@interface WKOverflowScrollViewDelegate : NSObject <UIScrollViewDelegate> {
+    WebKit::ScrollingTreeOverflowScrollingNodeIOS* _scrollingTreeNode;
+}
+- (instancetype)initWithScrollingTreeNode:(WebKit::ScrollingTreeOverflowScrollingNodeIOS*)node;
+
+@end
+
+
+@implementation WKOverflowScrollViewDelegate
+
+- (instancetype)initWithScrollingTreeNode:(WebKit::ScrollingTreeOverflowScrollingNodeIOS*)node
+{
+    if ((self = [super init])) {
+        _scrollingTreeNode = node;
+    }
+    return self;
+}
+
+- (void)scrollViewDidScroll:(UIScrollView *)scrollView
+{
+    _scrollingTreeNode->scrollViewDidScroll(scrollView.contentOffset);
+}
+
+- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
+{
+}
+
+- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
+{
+}
+
+- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
+{
+}
+
+@end
+
 namespace WebKit {
 
 PassOwnPtr<ScrollingTreeOverflowScrollingNodeIOS> ScrollingTreeOverflowScrollingNodeIOS::create(WebCore::ScrollingTree& scrollingTree, WebCore::ScrollingNodeID nodeID)
@@ -49,14 +87,46 @@
 
 ScrollingTreeOverflowScrollingNodeIOS::~ScrollingTreeOverflowScrollingNodeIOS()
 {
+    BEGIN_BLOCK_OBJC_EXCEPTIONS
+    if (UIScrollView *scrollView = (UIScrollView *)[scrollLayer() delegate]) {
+        ASSERT([scrollView isKindOfClass:[UIScrollView self]]);
+        scrollView.delegate = nil;
+    }
+    END_BLOCK_OBJC_EXCEPTIONS
 }
 
+void ScrollingTreeOverflowScrollingNodeIOS::updateBeforeChildren(const WebCore::ScrollingStateNode& stateNode)
+{
+    if (stateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollLayer)) {
+        BEGIN_BLOCK_OBJC_EXCEPTIONS
+        if (UIScrollView *scrollView = (UIScrollView *)[scrollLayer() delegate]) {
+            ASSERT([scrollView isKindOfClass:[UIScrollView self]]);
+            scrollView.delegate = nil;
+        }
+        END_BLOCK_OBJC_EXCEPTIONS
+    }
+
+    ScrollingTreeScrollingNodeIOS::updateBeforeChildren(stateNode);
+}
+
 void ScrollingTreeOverflowScrollingNodeIOS::updateAfterChildren(const ScrollingStateNode& stateNode)
 {
     ScrollingTreeScrollingNodeIOS::updateAfterChildren(stateNode);
 
     const auto& scrollingStateNode = toScrollingStateScrollingNode(stateNode);
 
+    if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollLayer)) {
+        BEGIN_BLOCK_OBJC_EXCEPTIONS
+        UIScrollView *scrollView = (UIScrollView *)[scrollLayer() delegate];
+        ASSERT([scrollView isKindOfClass:[UIScrollView self]]);
+
+        if (!m_scrollViewDelegate)
+            m_scrollViewDelegate = adoptNS([[WKOverflowScrollViewDelegate alloc] initWithScrollingTreeNode:this]);
+
+        scrollView.delegate = m_scrollViewDelegate.get();
+        END_BLOCK_OBJC_EXCEPTIONS
+    }
+
     if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::TotalContentsSize)) {
         BEGIN_BLOCK_OBJC_EXCEPTIONS
         UIScrollView *scrollView = (UIScrollView *)[scrollLayer() delegate];
@@ -68,6 +138,11 @@
     }
 }
 
+void ScrollingTreeOverflowScrollingNodeIOS::scrollViewDidScroll(const FloatPoint& scrollPosition)
+{
+    scrollingTree().scrollPositionChangedViaDelegatedScrolling(scrollingNodeID(), scrollPosition);
+}
+
 } // namespace WebCore
 
 #endif // ENABLE(ASYNC_SCROLLING)

Modified: trunk/Source/WebKit2/WebProcess/Scrolling/RemoteScrollingCoordinator.mm (166530 => 166531)


--- trunk/Source/WebKit2/WebProcess/Scrolling/RemoteScrollingCoordinator.mm	2014-03-31 21:22:42 UTC (rev 166530)
+++ trunk/Source/WebKit2/WebProcess/Scrolling/RemoteScrollingCoordinator.mm	2014-03-31 21:23:27 UTC (rev 166531)
@@ -93,7 +93,7 @@
 // Notification from the UI process that we scrolled.
 void RemoteScrollingCoordinator::scrollPositionChangedForNode(ScrollingNodeID nodeID, const FloatPoint& scrollPosition)
 {
-    scheduleUpdateScrollPositionAfterAsyncScroll(nodeID, roundedIntPoint(scrollPosition), false /* FIXME */, SyncScrollingLayerPosition);
+    scheduleUpdateScrollPositionAfterAsyncScroll(nodeID, scrollPosition, false /* FIXME */, SyncScrollingLayerPosition);
 }
 
 } // namespace WebKit
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