[oilpan] Completely move HTMLFormControlElement's hierarchy to the managed heap

Source/core/rendering/RenderListBox.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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 87 matching lines @@
 }
 
 RenderListBox::~RenderListBox()
 {
     setHasVerticalScrollbar(false);
 
     if (FrameView* frameView = frame()->view())
         frameView->removeScrollableArea(this);
 }
 
-inline HTMLSelectElement* RenderListBox::selectElement() const
+inline Result<HTMLSelectElement> RenderListBox::selectElement() const
 {
     return toHTMLSelectElement(node());
 }
 
 void RenderListBox::updateFromElement()
 {
     FontCachePurgePreventer fontCachePurgePreventer;
 
     if (m_optionsChanged) {
         const Vector<HTMLElement*>& listItems = selectElement()->listItems();
@@ skipping 68 matching lines @@
     }
 
     if (m_scrollToRevealSelectionAfterLayout) {
         LayoutStateDisabler layoutStateDisabler(view());
         scrollToRevealSelection();
     }
 }
 
 void RenderListBox::scrollToRevealSelection()
 {    
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
 
     m_scrollToRevealSelectionAfterLayout = false;
 
     int firstIndex = select->activeSelectionStartListIndex();
     if (firstIndex >= 0 && !listIndexIsVisible(select->activeSelectionEndListIndex()))
         scrollToRevealElementAtListIndex(firstIndex);
 }
 
 void RenderListBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
 {
@@ skipping 117 matching lines @@
     default:
         break;
     }
 }
 
 void RenderListBox::addFocusRingRects(Vector<IntRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer)
 {
     if (!isSpatialNavigationEnabled(frame()))
         return RenderBlock::addFocusRingRects(rects, additionalOffset, paintContainer);
 
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
 
     // Focus the last selected item.
     int selectedItem = select->activeSelectionEndListIndex();
     if (selectedItem >= 0) {
         rects.append(pixelSnappedIntRect(itemBoundingBoxRect(additionalOffset, selectedItem)));
         return;
     }
 
     // No selected items, find the first non-disabled item.
     int size = numItems();
@@ skipping 36 matching lines @@
         offset.setWidth((itemBoudingBox.width() - textWidth) / 2);
     } else
         offset.setWidth(optionsSpacingHorizontal);
     return offset;
 }
 
 void RenderListBox::paintItemForeground(PaintInfo& paintInfo, const LayoutPoint& paintOffset, int listIndex)
 {
     FontCachePurgePreventer fontCachePurgePreventer;
 
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
 
     const Vector<HTMLElement*>& listItems = select->listItems();
     HTMLElement* element = listItems[listIndex];
 
     RenderStyle* itemStyle = element->renderStyle();
     if (!itemStyle)
         itemStyle = style();
 
     if (itemStyle->visibility() == HIDDEN)
         return;
@@ skipping 124 matching lines @@
     // Let's attenuate the speed
     yDelta /= speedReducer;
 
     IntPoint scrollPoint(0, 0);
     scrollPoint.setY(absOffset.y() + yDelta);
     int newOffset = scrollToward(scrollPoint);
     if (newOffset < 0) 
         return;
 
     m_inAutoscroll = true;
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
     select->updateListBoxSelection(!select->multiple());
     m_inAutoscroll = false;
 }
 
 int RenderListBox::scrollToward(const IntPoint& destination)
 {
     // FIXME: This doesn't work correctly with transforms.
     FloatPoint absPos = localToAbsolute();
     IntSize positionOffset = roundedIntSize(destination - absPos);
 
     int rows = numVisibleItems();
     int offset = m_indexOffset;
     
     if (positionOffset.height() < borderTop() + paddingTop() && scrollToRevealElementAtListIndex(offset - 1))
         return offset - 1;
     
     if (positionOffset.height() > height() - paddingBottom() - borderBottom() && scrollToRevealElementAtListIndex(offset + rows))
         return offset + rows - 1;
     
     return listIndexAtOffset(positionOffset);
 }
 
 void RenderListBox::autoscroll(const IntPoint&)
 {
     IntPoint pos = frame()->view()->windowToContents(frame()->eventHandler()->lastKnownMousePosition());
 
     int endIndex = scrollToward(pos);
     if (endIndex >= 0) {
-        HTMLSelectElement* select = selectElement();
+        Handle<HTMLSelectElement> select = selectElement();
         m_inAutoscroll = true;
 
         if (!select->multiple())
             select->setActiveSelectionAnchorIndex(endIndex);
 
         select->setActiveSelectionEndIndex(endIndex);
         select->updateListBoxSelection(!select->multiple());
         m_inAutoscroll = false;
     }
 }
@@ skipping 29 matching lines @@
     return ScrollableArea::scroll(direction, granularity, multiplier);
 }
 
 bool RenderListBox::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity, float multiplier, Node**)
 {
     return ScrollableArea::scroll(logicalToPhysical(direction, style()->isHorizontalWritingMode(), style()->isFlippedBlocksWritingMode()), granularity, multiplier);
 }
 
 void RenderListBox::valueChanged(unsigned listIndex)
 {
-    HTMLSelectElement* element = selectElement();
+    Handle<HTMLSelectElement> element = selectElement();
     element->setSelectedIndex(element->listToOptionIndex(listIndex));
     element->dispatchFormControlChangeEvent();
 }
 
 int RenderListBox::scrollSize(ScrollbarOrientation orientation) const
 {
     return ((orientation == VerticalScrollbar) && m_vBar) ? (m_vBar->totalSize() - m_vBar->visibleSize()) : 0;
 }
 
 int RenderListBox::scrollPosition(Scrollbar*) const
@@ skipping 252 matching lines @@
 
     if (m_vBar)
         m_vBar->styleChanged();
 
     // Force an update since we know the scrollbars have changed things.
     if (document()->hasAnnotatedRegions())
         document()->setAnnotatedRegionsDirty(true);
 }
 
 } // namespace WebCore