WebKit merge 40668:40722 part 1.

third_party/WebKit/WebCore/rendering/RenderBoxModelObject.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "RenderBoxModelObject.h"
 
+#include "RenderBlock.h"
+#include "RenderLayer.h"
+#include "RenderView.h"
+
 namespace WebCore {
 
+bool RenderBoxModelObject::s_wasFloating = false;
+
 RenderBoxModelObject::RenderBoxModelObject(Node* node)
     : RenderObject(node)
+    , m_layer(0)
 {
 }
 
 RenderBoxModelObject::~RenderBoxModelObject()
 {
 }
 
+void RenderBoxModelObject::destroy()
+{
+    // This must be done before we destroy the RenderObject.
+    if (m_layer)
+        m_layer->clearClipRects();
+    RenderObject::destroy();
+}
+
+void RenderBoxModelObject::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
+{
+    s_wasFloating = isFloating();
+    RenderObject::styleWillChange(diff, newStyle);
+}
+
+void RenderBoxModelObject::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
+{
+    RenderObject::styleDidChange(diff, oldStyle);
+    updateBoxModelInfoFromStyle();
+    
+    if (requiresLayer()) {
+        if (!layer()) {
+            if (s_wasFloating && isFloating())
+                setChildNeedsLayout(true);
+            m_layer = new (renderArena()) RenderLayer(this);
+            setHasLayer(true);
+            m_layer->insertOnlyThisLayer();
+            if (parent() && !needsLayout() && containingBlock())
+                m_layer->updateLayerPositions();
+        }
+    } else if (layer() && layer()->parent()) {
+        
+        RenderLayer* layer = m_layer;
+        m_layer = 0;
+        setHasLayer(false);
+        setHasTransform(false); // Either a transform wasn't specified or the object doesn't support transforms, so just null out the bit.
+        setHasReflection(false);
+        layer->removeOnlyThisLayer();
+        if (s_wasFloating && isFloating())
+            setChildNeedsLayout(true);
+    }
+
+    if (m_layer)
+        m_layer->styleChanged(diff, oldStyle);
+}
+
+void RenderBoxModelObject::updateBoxModelInfoFromStyle()
+{
+    // Set the appropriate bits for a box model object.  Since all bits are cleared in styleWillChange,
+    // we only check for bits that could possibly be set to true.
+    setHasBoxDecorations(style()->hasBorder() || style()->hasBackground() || style()->hasAppearance() || style()->boxShadow());
+    setInline(style()->isDisplayInlineType());
+    setRelPositioned(style()->position() == RelativePosition);
+}
+
+int RenderBoxModelObject::relativePositionOffsetX() const
+{
+    if (!style()->left().isAuto()) {
+        if (!style()->right().isAuto() && containingBlock()->style()->direction() == RTL)
+            return -style()->right().calcValue(containingBlockWidth());
+        return style()->left().calcValue(containingBlockWidth());
+    }
+    if (!style()->right().isAuto())
+        return -style()->right().calcValue(containingBlockWidth());
+    return 0;
+}
+
+int RenderBoxModelObject::relativePositionOffsetY() const
+{
+    if (!style()->top().isAuto()) {
+        if (!style()->top().isPercent() || containingBlock()->style()->height().isFixed())
+            return style()->top().calcValue(containingBlockHeight());
+    } else if (!style()->bottom().isAuto()) {
+        if (!style()->bottom().isPercent() || containingBlock()->style()->height().isFixed())
+            return -style()->bottom().calcValue(containingBlockHeight());
+    }
+    return 0;
+}
+
 } // namespace WebCore