RenderScrollbarPart.cpp [plain text]
#include "config.h"
#include "RenderScrollbarPart.h"
#include "PaintInfo.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(LayoutPoint()); 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& length, int containingLength, RenderView* renderView)
{
if (length.isIntrinsicOrAuto())
return ScrollbarTheme::theme()->scrollbarThickness();
return minimumValueForLength(length, containingLength, renderView);
}
void RenderScrollbarPart::computeScrollbarWidth()
{
if (!m_scrollbar->owningRenderer())
return;
RenderView* renderView = view();
int visibleSize = m_scrollbar->owningRenderer()->width() - m_scrollbar->owningRenderer()->borderLeft() - m_scrollbar->owningRenderer()->borderRight();
int w = calcScrollbarThicknessUsing(style()->width(), visibleSize, renderView);
int minWidth = calcScrollbarThicknessUsing(style()->minWidth(), visibleSize, renderView);
int maxWidth = style()->maxWidth().isUndefined() ? w : calcScrollbarThicknessUsing(style()->maxWidth(), visibleSize, renderView);
setWidth(max(minWidth, min(maxWidth, w)));
m_marginLeft = minimumValueForLength(style()->marginLeft(), visibleSize, renderView);
m_marginRight = minimumValueForLength(style()->marginRight(), visibleSize, renderView);
}
void RenderScrollbarPart::computeScrollbarHeight()
{
if (!m_scrollbar->owningRenderer())
return;
RenderView* renderView = view();
int visibleSize = m_scrollbar->owningRenderer()->height() - m_scrollbar->owningRenderer()->borderTop() - m_scrollbar->owningRenderer()->borderBottom();
int h = calcScrollbarThicknessUsing(style()->height(), visibleSize, renderView);
int minHeight = calcScrollbarThicknessUsing(style()->minHeight(), visibleSize, renderView);
int maxHeight = style()->maxHeight().isUndefined() ? h : calcScrollbarThicknessUsing(style()->maxHeight(), visibleSize, renderView);
setHeight(max(minHeight, min(maxHeight, h)));
m_marginTop = minimumValueForLength(style()->marginTop(), visibleSize, renderView);
m_marginBottom = minimumValueForLength(style()->marginBottom(), visibleSize, renderView);
}
void RenderScrollbarPart::computePreferredLogicalWidths()
{
if (!preferredLogicalWidthsDirty())
return;
m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = 0;
setPreferredLogicalWidthsDirty(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(frameView->scrollCornerRect());
return;
}
}
RenderBlock::imageChanged(image, rect);
}
}
void RenderScrollbarPart::paintIntoRect(GraphicsContext* graphicsContext, const LayoutPoint& paintOffset, const LayoutRect& rect)
{
setLocation(rect.location() - toSize(paintOffset));
setWidth(rect.width());
setHeight(rect.height());
if (graphicsContext->paintingDisabled())
return;
PaintInfo paintInfo(graphicsContext, pixelSnappedIntRect(rect), PaintPhaseBlockBackground, false, 0, 0, 0);
paint(paintInfo, paintOffset);
paintInfo.phase = PaintPhaseChildBlockBackgrounds;
paint(paintInfo, paintOffset);
paintInfo.phase = PaintPhaseFloat;
paint(paintInfo, paintOffset);
paintInfo.phase = PaintPhaseForeground;
paint(paintInfo, paintOffset);
paintInfo.phase = PaintPhaseOutline;
paint(paintInfo, paintOffset);
}
RenderObject* RenderScrollbarPart::rendererOwningScrollbar() const
{
if (!m_scrollbar)
return 0;
return m_scrollbar->owningRenderer();
}
}