Implement select listbox using shadow DOM

Source/core/rendering/RenderLayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 42 matching lines @@
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/page/EventHandler.h"
 #include "core/page/FocusController.h"
 #include "core/page/Page.h"
 #include "core/page/scrolling/ScrollingCoordinator.h"
 #include "core/rendering/RenderGeometryMap.h"
 #include "core/rendering/RenderScrollbar.h"
 #include "core/rendering/RenderScrollbarPart.h"
+#include "core/rendering/RenderTheme.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/compositing/CompositedLayerMapping.h"
 #include "core/rendering/compositing/RenderLayerCompositor.h"
 #include "platform/PlatformGestureEvent.h"
 #include "platform/PlatformMouseEvent.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/scroll/ScrollAnimator.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "public/platform/Platform.h"
@@ skipping 493 matching lines @@
 
 void RenderLayerScrollableArea::scrollToOffset(const IntSize& scrollOffset, ScrollOffsetClamping clamp)
 {
     IntSize newScrollOffset = clamp == ScrollOffsetClamped ? clampScrollOffset(scrollOffset) : scrollOffset;
     if (newScrollOffset != adjustedScrollOffset())
         scrollToOffsetWithoutAnimation(-scrollOrigin() + newScrollOffset);
 }
 
 void RenderLayerScrollableArea::updateAfterLayout()
 {
-    // List box parts handle the scrollbars by themselves so we have nothing to do.
-    if (box().style()->appearance() == ListboxPart)
-        return;
-
     m_scrollDimensionsDirty = true;
     IntSize originalScrollOffset = adjustedScrollOffset();
 
     computeScrollDimensions();
 
     if (!box().isMarquee()) {
         // Layout may cause us to be at an invalid scroll position. In this case we need
         // to pull our scroll offsets back to the max (or push them up to the min).
         IntSize clampedScrollOffset = clampScrollOffset(adjustedScrollOffset());
         if (clampedScrollOffset != adjustedScrollOffset())
@@ skipping 101 matching lines @@
     return overflow == OSCROLL;
 }
 
 static bool overflowDefinesAutomaticScrollbar(EOverflow overflow)
 {
     return overflow == OAUTO || overflow == OOVERLAY;
 }
 
 void RenderLayerScrollableArea::updateAfterStyleChange(const RenderStyle* oldStyle)
 {
-    // List box parts handle the scrollbars by themselves so we have nothing to do.
-    if (box().style()->appearance() == ListboxPart)
-        return;
-
     // RenderView shouldn't provide scrollbars on its own.
     if (box().isRenderView())
         return;
 
     if (!m_scrollDimensionsDirty)
         updateScrollableAreaSet(hasScrollableHorizontalOverflow() || hasScrollableVerticalOverflow());
 
     EOverflow overflowX = box().style()->overflowX();
     EOverflow overflowY = box().style()->overflowY();
 
@@ skipping 131 matching lines @@
 }
 
 PassRefPtr<Scrollbar> RenderLayerScrollableArea::createScrollbar(ScrollbarOrientation orientation)
 {
     RefPtr<Scrollbar> widget;
     RenderObject* actualRenderer = rendererForScrollbar(box());
     bool hasCustomScrollbarStyle = actualRenderer->isBox() && actualRenderer->style()->hasPseudoStyle(SCROLLBAR);
     if (hasCustomScrollbarStyle) {
         widget = RenderScrollbar::createCustomScrollbar(this, orientation, actualRenderer->node());
     } else {
-        widget = Scrollbar::create(this, orientation, RegularScrollbar);
+        ScrollbarControlSize scrollbarSize = RegularScrollbar;
+        if (actualRenderer->style()->hasAppearance())
+            scrollbarSize = RenderTheme::theme().scrollbarControlSizeForPart(actualRenderer->style()->appearance());
+        widget = Scrollbar::create(this, orientation, scrollbarSize);
         if (orientation == HorizontalScrollbar)
             didAddScrollbar(widget.get(), HorizontalScrollbar);
         else
             didAddScrollbar(widget.get(), VerticalScrollbar);
     }
     box().document().view()->addChild(widget.get());
     return widget.release();
 }
 
 void RenderLayerScrollableArea::destroyScrollbar(ScrollbarOrientation orientation)
@@ skipping 597 matching lines @@
 void RenderLayerScrollableArea::setTopmostScrollChild(RenderLayer* scrollChild)
 {
     // We only want to track the topmost scroll child for scrollable areas with
     // overlay scrollbars.
     if (!hasOverlayScrollbars())
         return;
     m_nextTopmostScrollChild = scrollChild;
 }
 
 } // Namespace WebCore