--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/rendering/RenderScrollbarPart.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 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
+ *    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. 
+ */
+
+#include "config.h"
+#include "RenderScrollbarPart.h"
+#include "RenderScrollbar.h"
+#include "RenderScrollbarTheme.h"
+#include "RenderView.h"
+
+using namespace std;
+
+namespace WebCore {
+
+RenderScrollbarPart::RenderScrollbarPart(Node* node, RenderScrollbar* scrollbar, ScrollbarPart part)
+    : RenderBlock(node)
+    , m_scrollbar(scrollbar)
+    , m_part(part)
+{
+}
+
+RenderScrollbarPart::~RenderScrollbarPart()
+{
+}
+
+void RenderScrollbarPart::layout()
+{
+    setLocation(IntPoint()); // We don't worry about positioning ourselves.  We're just determining our minimum width/height.
+    if (m_scrollbar->orientation() == HorizontalScrollbar)
+        layoutHorizontalPart();
+    else
+        layoutVerticalPart();
+
+    setNeedsLayout(false);
+}
+
+void RenderScrollbarPart::layoutHorizontalPart()
+{
+    if (m_part == ScrollbarBGPart) {
+        setWidth(m_scrollbar->width());
+        computeScrollbarHeight();
+    } else {
+        computeScrollbarWidth();
+        setHeight(m_scrollbar->height());
+    }
+}
+
+void RenderScrollbarPart::layoutVerticalPart()
+{
+    if (m_part == ScrollbarBGPart) {
+        computeScrollbarWidth();
+        setHeight(m_scrollbar->height());
+    } else {
+        setWidth(m_scrollbar->width());
+        computeScrollbarHeight();
+    } 
+}
+
+static int calcScrollbarThicknessUsing(const Length& l, int containingLength)
+{
+    if (l.isIntrinsicOrAuto())
+        return ScrollbarTheme::nativeTheme()->scrollbarThickness();
+    return l.calcMinValue(containingLength);
+}
+
+void RenderScrollbarPart::computeScrollbarWidth()
+{
+    int visibleSize = m_scrollbar->owningRenderer()->width() - m_scrollbar->owningRenderer()->borderLeft() - m_scrollbar->owningRenderer()->borderRight();
+    int w = calcScrollbarThicknessUsing(style()->width(), visibleSize);
+    int minWidth = calcScrollbarThicknessUsing(style()->minWidth(), visibleSize);
+    int maxWidth = style()->maxWidth().isUndefined() ? w : calcScrollbarThicknessUsing(style()->maxWidth(), visibleSize);
+    setWidth(max(minWidth, min(maxWidth, w)));
+    
+    // Buttons and track pieces can all have margins along the axis of the scrollbar. 
+    m_marginLeft = style()->marginLeft().calcMinValue(visibleSize);
+    m_marginRight = style()->marginRight().calcMinValue(visibleSize);
+}
+
+void RenderScrollbarPart::computeScrollbarHeight()
+{
+    int visibleSize = m_scrollbar->owningRenderer()->height() -  m_scrollbar->owningRenderer()->borderTop() - m_scrollbar->owningRenderer()->borderBottom();
+    int h = calcScrollbarThicknessUsing(style()->height(), visibleSize);
+    int minHeight = calcScrollbarThicknessUsing(style()->minHeight(), visibleSize);
+    int maxHeight = style()->maxHeight().isUndefined() ? h : calcScrollbarThicknessUsing(style()->maxHeight(), visibleSize);
+    setHeight(max(minHeight, min(maxHeight, h)));
+
+    // Buttons and track pieces can all have margins along the axis of the scrollbar. 
+    m_marginTop = style()->marginTop().calcMinValue(visibleSize);
+    m_marginBottom = style()->marginBottom().calcMinValue(visibleSize);
+}
+
+void RenderScrollbarPart::calcPrefWidths()
+{
+    if (!prefWidthsDirty())
+        return;
+    
+    m_minPrefWidth = m_maxPrefWidth = 0;
+
+    setPrefWidthsDirty(false);
+}
+
+void RenderScrollbarPart::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
+{
+    RenderBlock::styleWillChange(diff, newStyle);
+    setInline(false);
+}
+
+void RenderScrollbarPart::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
+{
+    RenderBlock::styleDidChange(diff, oldStyle);
+    setInline(false);
+    setPositioned(false);
+    setFloating(false);
+    setHasOverflowClip(false);
+    if (oldStyle && m_scrollbar && m_part != NoPart && diff >= StyleDifferenceRepaint)
+        m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
+}
+
+void RenderScrollbarPart::imageChanged(WrappedImagePtr image, const IntRect* rect)
+{
+    if (m_scrollbar && m_part != NoPart)
+        m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
+    else {
+        if (FrameView* frameView = view()->frameView()) {
+            if (frameView->isFrameViewScrollCorner(this)) {
+                frameView->invalidateScrollCorner();
+                return;
+            }
+        }
+        
+        RenderBlock::imageChanged(image, rect);
+    }
+}
+
+void RenderScrollbarPart::paintIntoRect(GraphicsContext* graphicsContext, int tx, int ty, const IntRect& rect)
+{
+    // Make sure our dimensions match the rect.
+    setLocation(rect.x() - tx, rect.y() - ty);
+    setWidth(rect.width());
+    setHeight(rect.height());
+
+    if (graphicsContext->paintingDisabled())
+        return;
+
+    // Now do the paint.
+    PaintInfo paintInfo(graphicsContext, rect, PaintPhaseBlockBackground, false, 0, 0);
+    paint(paintInfo, tx, ty);
+    paintInfo.phase = PaintPhaseChildBlockBackgrounds;
+    paint(paintInfo, tx, ty);
+    paintInfo.phase = PaintPhaseFloat;
+    paint(paintInfo, tx, ty);
+    paintInfo.phase = PaintPhaseForeground;
+    paint(paintInfo, tx, ty);
+    paintInfo.phase = PaintPhaseOutline;
+    paint(paintInfo, tx, ty);
+}
+
+}