Add EventHandlerRegistry

Source/core/page/scrolling/ScrollingCoordinator.cpp

 /*
  * Copyright (C) 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include "core/page/scrolling/ScrollingCoordinator.h"
 
 #include "RuntimeEnabledFeatures.h"
 #include "core/dom/Document.h"
 #include "core/dom/Node.h"
+#include "core/dom/ScrollEventHandlerController.h"
 #include "core/dom/WheelController.h"
 #include "core/html/HTMLElement.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/page/Page.h"
 #include "core/frame/Settings.h"
 #include "platform/TraceEvent.h"
 #include "platform/exported/WebScrollbarImpl.h"
 #include "platform/exported/WebScrollbarThemeGeometryNative.h"
 #include "platform/geometry/Region.h"
@@ skipping 573 matching lines @@
 {
     m_layersWithTouchRects.remove(layer);
 }
 
 void ScrollingCoordinator::setWheelEventHandlerCount(unsigned count)
 {
     if (WebLayer* scrollLayer = toWebLayer(m_page->mainFrame()->view()->layerForScrolling()))
         scrollLayer->setHaveWheelEventHandlers(count > 0);
 }
 
+void ScrollingCoordinator::setScrollEventHandlerCount(unsigned count)
+{
+    if (WebLayer* scrollLayer = toWebLayer(m_page->mainFrame()->view()->layerForScrolling()))
+        scrollLayer->setHaveScrollEventHandlers(count > 0);
+}
+
 void ScrollingCoordinator::recomputeWheelEventHandlerCountForFrameView(FrameView*)
 {
     setWheelEventHandlerCount(computeCurrentWheelEventHandlerCount());
 }
 
+void ScrollingCoordinator::recomputeScrollEventHandlerCountForFrameView(FrameView*)
+{
+    setScrollEventHandlerCount(computeCurrentScrollEventHandlerCount());
+}
+
 void ScrollingCoordinator::setShouldUpdateScrollLayerPositionOnMainThread(MainThreadScrollingReasons reasons)
 {
     if (WebLayer* scrollLayer = toWebLayer(m_page->mainFrame()->view()->layerForScrolling())) {
         m_lastMainThreadScrollingReasons = reasons;
         scrollLayer->setShouldScrollOnMainThread(reasons);
     }
 }
 
 void ScrollingCoordinator::pageDestroyed()
 {
@@ skipping 149 matching lines @@
     unsigned wheelEventHandlerCount = 0;
 
     for (LocalFrame* frame = m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
         if (frame->document())
             wheelEventHandlerCount += WheelController::from(*frame->document())->wheelEventHandlerCount();
     }
 
     return wheelEventHandlerCount;
 }
 
+unsigned ScrollingCoordinator::computeCurrentScrollEventHandlerCount()
+{
+    unsigned scrollEventHandlerCount = 0;
+
+    for (LocalFrame* frame = m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
+        if (frame->document())
+            scrollEventHandlerCount += ScrollEventHandlerController::from(*frame->document())->scrollEventHandlerCount();
+    }
+
+    return scrollEventHandlerCount;
+}
+
 void ScrollingCoordinator::frameViewWheelEventHandlerCountChanged(FrameView* frameView)
 {
     ASSERT(isMainThread());
     ASSERT(m_page);
 
     recomputeWheelEventHandlerCountForFrameView(frameView);
 }
 
+void ScrollingCoordinator::frameViewScrollEventHandlerCountChanged(FrameView* frameView)
+{
+    ASSERT(isMainThread());
+    ASSERT(m_page);
+
+    recomputeScrollEventHandlerCountForFrameView(frameView);
+}
+
 void ScrollingCoordinator::frameViewHasSlowRepaintObjectsDidChange(FrameView* frameView)
 {
     ASSERT(isMainThread());
     ASSERT(m_page);
 
     if (!coordinatesScrollingForFrameView(frameView))
         return;
 
     m_shouldScrollOnMainThreadDirty = true;
 }
@@ skipping 30 matching lines @@
 void ScrollingCoordinator::frameViewRootLayerDidChange(FrameView* frameView)
 {
     ASSERT(isMainThread());
     ASSERT(m_page);
 
     if (!coordinatesScrollingForFrameView(frameView))
         return;
 
     notifyLayoutUpdated();
     recomputeWheelEventHandlerCountForFrameView(frameView);
+    recomputeScrollEventHandlerCountForFrameView(frameView);
 }
 
 #if OS(MACOSX)
 void ScrollingCoordinator::handleWheelEventPhase(PlatformWheelEventPhase phase)
 {
     ASSERT(isMainThread());
 
     if (!m_page)
         return;
 
@@ skipping 75 matching lines @@
     bool frameIsScrollable = frameView && frameView->isScrollable();
     if (frameIsScrollable != m_wasFrameScrollable)
         return true;
 
     if (WebLayer* scrollLayer = frameView ? toWebLayer(frameView->layerForScrolling()) : 0)
         return blink::WebSize(frameView->contentsSize()) != scrollLayer->bounds();
     return false;
 }
 
 } // namespace WebCore