--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/WebCore/platform/ScrollBar.h	Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2004, 2006 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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 ScrollBar_h
+#define ScrollBar_h
+
+#include "Shared.h"
+#include "ScrollTypes.h"
+#include <wtf/MathExtras.h>
+
+namespace WebCore {
+
+class GraphicsContext;
+class IntRect;
+class Scrollbar;
+class PlatformMouseEvent;
+
+// These match the numbers we use over in WebKit (WebFrameView.m).
+#define LINE_STEP   40
+#define PAGE_KEEP   40
+
+enum ScrollbarControlSize { RegularScrollbar, SmallScrollbar, MiniScrollbar };
+
+class ScrollbarClient {
+public:
+    virtual ~ScrollbarClient() {}
+    virtual void valueChanged(Scrollbar*) = 0;
+
+    // Used to obtain a window clip rect.
+    virtual IntRect windowClipRect() const = 0;
+};
+
+class Scrollbar : public Shared<Scrollbar> {
+protected:
+    Scrollbar(ScrollbarClient*, ScrollbarOrientation, ScrollbarControlSize);
+
+public:
+    virtual ~Scrollbar() {}
+
+    virtual bool isWidget() const = 0;
+
+    ScrollbarOrientation orientation() const { return m_orientation; }
+    int value() const { return lroundf(m_currentPos); } 
+    
+    ScrollbarControlSize controlSize() const { return m_controlSize; }
+
+    void setSteps(int lineStep, int pageStep, int pixelsPerStep = 1);
+    
+    bool setValue(int);
+    void setProportion(int visibleSize, int totalSize);
+
+    bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1.0);
+    
+    virtual int width() const = 0;
+    virtual int height() const = 0;
+    virtual void setRect(const IntRect&) = 0;
+    virtual void setEnabled(bool) = 0;
+    virtual void paint(GraphicsContext*, const IntRect& damageRect) = 0;
+
+    static bool hasPlatformScrollbars() {
+        // To use the platform's built-in scrollbars by default, return true.  We may
+        // support styled engine scrollbars someday, and some platforms may wish to not
+        // implement a platform scrollbar at all by default.  That's what this method is for.
+        return true;
+    }
+
+    // These methods are used for platform scrollbars to give :hover feedback.  They will not get called
+    // when the mouse went down in a scrollbar, since it is assumed the scrollbar will start
+    // grabbing all events in that case anyway.
+    virtual bool handleMouseMoveEvent(const PlatformMouseEvent&) { return false; }
+    virtual bool handleMouseOutEvent(const PlatformMouseEvent&) { return false; }
+
+    // Used by some platform scrollbars to know when they've been released from capture.
+    virtual bool handleMouseReleaseEvent(const PlatformMouseEvent&) { return false; }
+   
+protected:
+    virtual void updateThumbPosition() = 0;
+    virtual void updateThumbProportion() = 0;
+
+    ScrollbarClient* client() const { return m_client; }
+
+    ScrollbarClient* m_client;
+    ScrollbarOrientation m_orientation;
+    ScrollbarControlSize m_controlSize;
+    int m_visibleSize;
+    int m_totalSize;
+    float m_currentPos;
+    int m_lineStep;
+    int m_pageStep;
+    float m_pixelStep;
+};
+
+}
+
+#endif