Allow objects without scrollbars to be scrollable

Source/core/platform/Scrollbar.cpp

 /*
  * Copyright (C) 2004, 2006, 2008 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
@@ skipping 37 matching lines @@
 #define THUMB_POSITION_AFFECTS_BUTTONS
 #endif
 
 namespace WebCore {
 
 PassRefPtr<Scrollbar> Scrollbar::createNativeScrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orientation, ScrollbarControlSize size)
 {
     return adoptRef(new Scrollbar(scrollableArea, orientation, size));
 }
 
-int Scrollbar::maxOverlapBetweenPages()
-{
-    static int maxOverlapBetweenPages = ScrollbarTheme::theme()->maxOverlapBetweenPages();
-    return maxOverlapBetweenPages;
-}
-
 Scrollbar::Scrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orientation, ScrollbarControlSize controlSize,
                      ScrollbarTheme* theme)
     : m_scrollableArea(scrollableArea)
     , m_orientation(orientation)
     , m_controlSize(controlSize)
     , m_theme(theme)
     , m_visibleSize(0)
     , m_totalSize(0)
     , m_currentPos(0)
     , m_dragOrigin(0)
-    , m_lineStep(0)
-    , m_pageStep(0)
-    , m_pixelStep(1)
     , m_hoveredPart(NoPart)
     , m_pressedPart(NoPart)
     , m_pressedPos(0)
     , m_scrollPos(0)
     , m_draggingDocument(false)
     , m_documentDragPos(0)
     , m_enabled(true)
     , m_scrollTimer(this, &Scrollbar::autoscrollTimerFired)
     , m_overlapsResizer(false)
     , m_suppressInvalidation(false)
@@ skipping 64 matching lines @@
 {
     if (visibleSize == m_visibleSize && totalSize == m_totalSize)
         return;
 
     m_visibleSize = visibleSize;
     m_totalSize = totalSize;
 
     updateThumbProportion();
 }
 
-void Scrollbar::setSteps(int lineStep, int pageStep, int pixelsPerStep)
-{
-    m_lineStep = lineStep;
-    m_pageStep = pageStep;
-    m_pixelStep = 1.0f / pixelsPerStep;
-}
-
 void Scrollbar::updateThumb()
 {
 #ifdef THUMB_POSITION_AFFECTS_BUTTONS
     invalidate();
 #else
     theme()->invalidateParts(this, ForwardTrackPart | BackTrackPart | ThumbPart);
 #endif
 }
 
 void Scrollbar::updateThumbPosition()
@@ skipping 417 matching lines @@
 
 IntPoint Scrollbar::convertFromContainingView(const IntPoint& parentPoint) const
 {
     if (m_scrollableArea)
         return m_scrollableArea->convertFromContainingViewToScrollbar(this, parentPoint);
 
     return Widget::convertFromContainingView(parentPoint);
 }
 
 } // namespace WebCore