Implement select element list box with shadow DOM.

Source/WebCore/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * 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.
@@ skipping 656 matching lines @@
     bool swallowEvent = false;
     m_mousePressed = true;
     m_selectionInitiationState = HaveNotStartedSelection;
 
     if (event.event().clickCount() == 2)
         swallowEvent = handleMousePressEventDoubleClick(event);
     else if (event.event().clickCount() >= 3)
         swallowEvent = handleMousePressEventTripleClick(event);
     else
         swallowEvent = handleMousePressEventSingleClick(event);
-    
+
     m_mouseDownMayStartAutoscroll = m_mouseDownMayStartSelect
         || (m_mousePressNode && m_mousePressNode->renderBox() && m_mousePressNode->renderBox()->canBeProgramaticallyScrolled());
 
     return swallowEvent;
 }
 
 bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& event)
 {
     if (!m_mousePressed)
         return false;
 
     if (handleDrag(event, ShouldCheckDragHysteresis))
         return true;
 
     Node* targetNode = event.targetNode();
     if (event.event().button() != LeftButton || !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);
         m_frame->document()->renderView()->hitTest(request, result);
 
         updateSelectionForMouseDrag(result);
     }
     updateSelectionForMouseDrag(event.hitTestResult());
     return true;
 }
@@ skipping 934 matching lines @@
             }
         }
     }
     
     m_lastMouseMoveEventSubframe = newSubframe;
 
     if (swallowEvent)
         return true;
     
     swallowEvent = !dispatchMouseEvent(eventNames().mousemoveEvent, mev.targetNode(), false, 0, mouseEvent, true);
+
+    RenderObject* renderer = targetNode->renderer();
+    if (!renderer) {
+        Node* parent = EventPathWalker::parent(targetNode);
+        if (!parent)
+            return false;
+
+        renderer = parent->renderer();
+        if (!renderer || !renderer->isListBox())
+            return false;
+    }
+
+    if (m_mouseDownMayStartAutoscroll && !panScrollInProgress()) {
+        m_autoscrollController->startAutoscrollForSelection(renderer);
+        m_mouseDownMayStartAutoscroll = false;
+    }
     if (!swallowEvent)
         swallowEvent = handleMouseDraggedEvent(mev);
 
     return swallowEvent;
 }
 
 void EventHandler::invalidateClick()
 {
     m_clickCount = 0;
     m_clickNode = 0;
@@ skipping 311 matching lines @@
 void EventHandler::setCapturingMouseEventsNode(PassRefPtr<Node> n)
 {
     m_capturingMouseEventsNode = n;
     m_eventHandlerWillResetCapturingMouseEventsNode = false;
 }
 
 MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestRequest& request, const PlatformMouseEvent& mev)
 {
     ASSERT(m_frame);
     ASSERT(m_frame->document());
-    
+
     return m_frame->document()->prepareMouseEvent(request, documentPointForWindowPoint(m_frame, mev.position()), mev);
 }
 
 #if ENABLE(SVG)
 static inline SVGElementInstance* instanceAssociatedWithShadowTreeElement(Node* referenceNode)
 {
     if (!referenceNode || !referenceNode->isSVGElement())
         return 0;
 
     ShadowRoot* shadowRoot = referenceNode->containingShadowRoot();
@@ skipping 1988 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(DARWIN)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace WebCore