Implement select element list box with shadow DOM.

Source/WebCore/page/EventHandler.cpp

Index: Source/WebCore/page/EventHandler.cpp
diff --git a/Source/WebCore/page/EventHandler.cpp b/Source/WebCore/page/EventHandler.cpp
index 4266cc9f26bce10c403831123a6c6d22ffa8d554..cf48b3bff382d15d6d2826f608b71758355aa62d 100644
--- a/Source/WebCore/page/EventHandler.cpp
+++ b/Source/WebCore/page/EventHandler.cpp
@@ -674,7 +674,7 @@ bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& eve
         swallowEvent = handleMousePressEventTripleClick(event);
     else
         swallowEvent = handleMousePressEventSingleClick(event);
-    
+
     m_mouseDownMayStartAutoscroll = m_mouseDownMayStartSelect
         || (m_mousePressNode && m_mousePressNode->renderBox() && m_mousePressNode->renderBox()->canBeProgramaticallyScrolled());
 
@@ -689,28 +689,11 @@ bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& e
     if (handleDrag(event, ShouldCheckDragHysteresis))
         return true;
 
-    Node* targetNode = event.targetNode();
-    if (event.event().button() != LeftButton || !targetNode)
+    if (event.event().button() != LeftButton || !event.targetNode())
         return false;
 
-    RenderObject* renderer = targetNode->renderer();
-    if (!renderer) {
-        Node* parent = EventPathWalker::parent(targetNode);
-        if (!parent)
-            return false;
-
-        renderer = parent->renderer();
-        if (!renderer || !renderer->isListBox())
-            return false;
-    }
-
     m_mouseDownMayStartDrag = false;
 
-    if (m_mouseDownMayStartAutoscroll && !panScrollInProgress()) {
-        m_autoscrollController->startAutoscrollForSelection(renderer);
-        m_mouseDownMayStartAutoscroll = false;
-    }
-
     if (m_selectionInitiationState != ExtendedSelection) {
         HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
         HitTestResult result(m_mouseDownPos);
@@ -1641,9 +1624,11 @@ bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& mouseEvent, Hi
     if (m_lastMouseMoveEventSubframe && m_lastMouseMoveEventSubframe->tree()->isDescendantOf(m_frame) && m_lastMouseMoveEventSubframe != newSubframe)
         passMouseMoveEventToSubframe(mev, m_lastMouseMoveEventSubframe.get());
 
+    Node* targetNode = mev.targetNode();
+
     if (newSubframe) {
         // Update over/out state before passing the event to the subframe.
-        updateMouseEventTargetNode(mev.targetNode(), mouseEvent, true);
+        updateMouseEventTargetNode(targetNode, mouseEvent, true);
         
         // Event dispatch in updateMouseEventTargetNode may have caused the subframe of the target
         // node to be detached from its FrameView, in which case the event should not be passed.
@@ -1666,7 +1651,15 @@ bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& mouseEvent, Hi
     if (swallowEvent)
         return true;
     
-    swallowEvent = !dispatchMouseEvent(eventNames().mousemoveEvent, mev.targetNode(), false, 0, mouseEvent, true);
+    swallowEvent = !dispatchMouseEvent(eventNames().mousemoveEvent, targetNode, false, 0, mouseEvent, true);
+
+    RenderObject* renderer = targetNode ? targetNode->renderer() : 0;
+
+    if (renderer && m_mouseDownMayStartAutoscroll && !panScrollInProgress()) {
+        m_autoscrollController->startAutoscrollForSelection(renderer);
+        m_mouseDownMayStartAutoscroll = false;
+    }
+
     if (!swallowEvent)
         swallowEvent = handleMouseDraggedEvent(mev);
 
@@ -1998,7 +1991,7 @@ MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestReques
 {
     ASSERT(m_frame);
     ASSERT(m_frame->document());
-    
+
     return m_frame->document()->prepareMouseEvent(request, documentPointForWindowPoint(m_frame, mev.position()), mev);
 }