diff -r 000000000000 -r 4f2f89ce4247 WebCore/rendering/RenderScrollbar.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/rendering/RenderScrollbar.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
+ *
+ * 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.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#ifndef RenderScrollbar_h
+#define RenderScrollbar_h
+
+#include "RenderStyleConstants.h"
+#include "Scrollbar.h"
+#include <wtf/HashMap.h>
+
+namespace WebCore {
+
+class RenderBox;
+class RenderScrollbarPart;
+class RenderStyle;
+
+class RenderScrollbar : public Scrollbar {
+protected:
+    RenderScrollbar(ScrollbarClient*, ScrollbarOrientation, RenderBox*);
+
+public:
+    friend class Scrollbar;
+    static PassRefPtr<Scrollbar> createCustomScrollbar(ScrollbarClient*, ScrollbarOrientation, RenderBox*);
+    virtual ~RenderScrollbar();
+
+    static ScrollbarPart partForStyleResolve();
+    static RenderScrollbar* scrollbarForStyleResolve();
+
+    RenderBox* owningRenderer() const { return m_owner; }
+
+    void paintPart(GraphicsContext*, ScrollbarPart, const IntRect&);
+
+    IntRect buttonRect(ScrollbarPart);
+    IntRect trackRect(int startLength, int endLength);
+    IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&);
+
+    int minimumThumbLength();
+
+private:
+    virtual void setParent(ScrollView*);
+    virtual void setEnabled(bool);
+
+    virtual void paint(GraphicsContext*, const IntRect& damageRect);
+
+    virtual void setHoveredPart(ScrollbarPart);
+    virtual void setPressedPart(ScrollbarPart);
+
+    virtual void styleChanged();
+
+    virtual bool isCustomScrollbar() const { return true; }
+
+    void updateScrollbarParts(bool destroy = false);
+
+    PassRefPtr<RenderStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
+    void updateScrollbarPart(ScrollbarPart, bool destroy = false);
+
+    RenderBox* m_owner;
+    HashMap<unsigned, RenderScrollbarPart*> m_parts;
+};
+
+inline RenderScrollbar* toRenderScrollbar(Scrollbar* scrollbar)
+{
+    ASSERT(!scrollbar || scrollbar->isCustomScrollbar());
+    return static_cast<RenderScrollbar*>(scrollbar);
+}
+
+// This will catch anyone doing an unnecessary cast.
+void toRenderScrollbar(const RenderScrollbar*);
+
+} // namespace WebCore
+
+#endif // RenderScrollbar_h