--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/platform/Scrollbar.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,174 @@
+/*
+ * 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 "ScrollTypes.h"
+#include "Timer.h"
+#include "Widget.h"
+#include <wtf/MathExtras.h>
+#include <wtf/PassRefPtr.h>
+
+namespace WebCore {
+
+class GraphicsContext;
+class IntRect;
+class ScrollbarClient;
+class ScrollbarTheme;
+class PlatformMouseEvent;
+
+class Scrollbar : public Widget {
+public:
+    virtual ~Scrollbar();
+
+    // Must be implemented by platforms that can't simply use the Scrollbar base class.  Right now the only platform that is not using the base class is GTK.
+    static PassRefPtr<Scrollbar> createNativeScrollbar(ScrollbarClient* client, ScrollbarOrientation orientation, ScrollbarControlSize size);
+
+    static int pixelsPerLineStep() { return 40; }
+    static float minFractionToStepWhenPaging() { return 0.875f; }
+    static int maxOverlapBetweenPages();
+
+    void setClient(ScrollbarClient* client) { m_client = client; }
+    ScrollbarClient* client() const { return m_client; }
+
+    virtual bool isCustomScrollbar() const { return false; }
+    ScrollbarOrientation orientation() const { return m_orientation; }
+    
+    int value() const { return lroundf(m_currentPos); }
+    float currentPos() const { return m_currentPos; }
+    int pressedPos() const { return m_pressedPos; }
+    int visibleSize() const { return m_visibleSize; }
+    int totalSize() const { return m_totalSize; }
+    int maximum() const { return m_totalSize - m_visibleSize; }        
+    ScrollbarControlSize controlSize() const { return m_controlSize; }
+
+    int lineStep() const { return m_lineStep; }
+    int pageStep() const { return m_pageStep; }
+    float pixelStep() const { return m_pixelStep; }
+    
+    ScrollbarPart pressedPart() const { return m_pressedPart; }
+    ScrollbarPart hoveredPart() const { return m_hoveredPart; }
+    virtual void setHoveredPart(ScrollbarPart);
+    virtual void setPressedPart(ScrollbarPart);
+
+    void setSteps(int lineStep, int pageStep, int pixelsPerStep = 1);
+    bool setValue(int);
+    void setProportion(int visibleSize, int totalSize);
+    void setPressedPos(int p) { m_pressedPos = p; }
+
+    bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1.0f);
+    
+    virtual void paint(GraphicsContext*, const IntRect& damageRect);
+
+    bool enabled() const { return m_enabled; }
+    virtual void setEnabled(bool e);
+
+    bool isWindowActive() const;
+
+    // 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.
+    bool mouseMoved(const PlatformMouseEvent&);
+    bool mouseExited();
+    
+    // Used by some platform scrollbars to know when they've been released from capture.
+    bool mouseUp();
+
+    bool mouseDown(const PlatformMouseEvent&);
+
+#if PLATFORM(QT)
+    // For platforms that wish to handle context menu events.
+    // FIXME: This is misplaced.  Normal hit testing should be used to populate a correct
+    // context menu.  There's no reason why the scrollbar should have to do it.
+    bool contextMenu(const PlatformMouseEvent& event);
+#endif
+
+    ScrollbarTheme* theme() const { return m_theme; }
+
+    virtual void setParent(ScrollView*);
+    virtual void setFrameRect(const IntRect&);
+
+    virtual void invalidateRect(const IntRect&);
+    
+    bool suppressInvalidation() const { return m_suppressInvalidation; }
+    void setSuppressInvalidation(bool s) { m_suppressInvalidation = s; }
+
+    virtual void styleChanged() { }
+
+    virtual IntRect convertToContainingView(const IntRect&) const;
+    virtual IntRect convertFromContainingView(const IntRect&) const;
+    
+    virtual IntPoint convertToContainingView(const IntPoint&) const;
+    virtual IntPoint convertFromContainingView(const IntPoint&) const;
+
+private:
+    virtual bool isScrollbar() const { return true; }
+
+protected:
+    Scrollbar(ScrollbarClient*, ScrollbarOrientation, ScrollbarControlSize, ScrollbarTheme* = 0);
+
+    void updateThumb();
+    virtual void updateThumbPosition();
+    virtual void updateThumbProportion();
+
+    void autoscrollTimerFired(Timer<Scrollbar>*);
+    void startTimerIfNeeded(double delay);
+    void stopTimerIfNeeded();
+    void autoscrollPressedPart(double delay);
+    ScrollDirection pressedPartScrollDirection();
+    ScrollGranularity pressedPartScrollGranularity();
+    
+    void moveThumb(int pos);
+    bool setCurrentPos(float pos);
+
+    ScrollbarClient* m_client;
+    ScrollbarOrientation m_orientation;
+    ScrollbarControlSize m_controlSize;
+    ScrollbarTheme* m_theme;
+    
+    int m_visibleSize;
+    int m_totalSize;
+    float m_currentPos;
+    float m_dragOrigin;
+    int m_lineStep;
+    int m_pageStep;
+    float m_pixelStep;
+
+    ScrollbarPart m_hoveredPart;
+    ScrollbarPart m_pressedPart;
+    int m_pressedPos;
+    
+    bool m_enabled;
+
+    Timer<Scrollbar> m_scrollTimer;
+    bool m_overlapsResizer;
+    
+    bool m_suppressInvalidation;
+};
+
+}
+
+#endif