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diff --git a/Source/WebCore/rendering/RenderFlexibleBox.h b/Source/WebCore/rendering/RenderFlexibleBox.h
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+++ b/Source/WebCore/rendering/RenderFlexibleBox.h
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+/*
+ * This file is part of the render object implementation for KHTML.
+ *
+ * Copyright (C) 2003 Apple Computer, Inc.
+ *
+ * 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.
+ *
+ */
+
+#ifndef RenderFlexibleBox_h
+#define RenderFlexibleBox_h
+
+#include "RenderBlock.h"
+
+namespace WebCore {
+
+class FlexBoxIterator;
+
+class RenderFlexibleBox : public RenderBlock {
+public:
+    RenderFlexibleBox(Node*);
+    virtual ~RenderFlexibleBox();
+
+    virtual const char* renderName() const;
+
+    virtual void computePreferredLogicalWidths();
+    void calcHorizontalPrefWidths();
+    void calcVerticalPrefWidths();
+
+    virtual void layoutBlock(bool relayoutChildren, int pageHeight);
+    void layoutHorizontalBox(bool relayoutChildren);
+    void layoutVerticalBox(bool relayoutChildren);
+
+    virtual bool avoidsFloats() const { return true; }
+
+    virtual bool isFlexibleBox() const { return true; }
+    virtual bool isFlexingChildren() const { return m_flexingChildren; }
+    virtual bool isStretchingChildren() const { return m_stretchingChildren; }
+
+    void placeChild(RenderBox* child, int x, int y);
+
+protected:
+    int allowedChildFlex(RenderBox* child, bool expanding, unsigned group);
+
+    bool hasMultipleLines() const { return style()->boxLines() == MULTIPLE; }
+    bool isVertical() const { return style()->boxOrient() == VERTICAL; }
+    bool isHorizontal() const { return style()->boxOrient() == HORIZONTAL; }
+
+    bool m_flexingChildren : 1;
+    bool m_stretchingChildren : 1;
+
+private:
+    void applyLineClamp(FlexBoxIterator&, bool relayoutChildren);
+};
+
+} // namespace WebCore
+
+#endif // RenderFlexibleBox_h