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/*
* 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 "PaintInfo.h"
#include "RenderScrollbar.h"
#include "RenderScrollbarTheme.h"
#include "RenderView.h"
#include <wtf/StackStats.h>
using namespace std;
namespace WebCore {
RenderScrollbarPart::RenderScrollbarPart(RenderScrollbar* scrollbar, ScrollbarPart part)
: RenderBlock(0)
, m_scrollbar(scrollbar)
, m_part(part)
{
}
RenderScrollbarPart::~RenderScrollbarPart()
{
}
RenderScrollbarPart* RenderScrollbarPart::createAnonymous(Document* document, RenderScrollbar* scrollbar, ScrollbarPart part)
{
RenderScrollbarPart* renderer = new (document->renderArena()) RenderScrollbarPart(scrollbar, part);
renderer->setDocumentForAnonymous(document);
return renderer;
}
void RenderScrollbarPart::layout()
{
StackStats::LayoutCheckPoint layoutCheckPoint;
setLocation(LayoutPoint()); // 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(SizeType sizeType, const Length& length, int containingLength, RenderView* renderView)
{
if (!length.isIntrinsicOrAuto() || (sizeType == MinSize && length.isAuto()))
return minimumValueForLength(length, containingLength, renderView);
return ScrollbarTheme::theme()->scrollbarThickness();
}
void RenderScrollbarPart::computeScrollbarWidth()
{
if (!m_scrollbar->owningRenderer())
return;
RenderView* renderView = view();
// FIXME: We are querying layout information but nothing guarantees that it's up-to-date, especially since we are called at style change.
// FIXME: Querying the style's border information doesn't work on table cells with collapsing borders.
int visibleSize = m_scrollbar->owningRenderer()->width() - m_scrollbar->owningRenderer()->style()->borderLeftWidth() - m_scrollbar->owningRenderer()->style()->borderRightWidth();
int w = calcScrollbarThicknessUsing(MainOrPreferredSize, style()->width(), visibleSize, renderView);
int minWidth = calcScrollbarThicknessUsing(MinSize, style()->minWidth(), visibleSize, renderView);
int maxWidth = style()->maxWidth().isUndefined() ? w : calcScrollbarThicknessUsing(MaxSize, style()->maxWidth(), visibleSize, renderView);
setWidth(max(minWidth, min(maxWidth, w)));
// Buttons and track pieces can all have margins along the axis of the scrollbar.
m_marginBox.setLeft(minimumValueForLength(style()->marginLeft(), visibleSize, renderView));
m_marginBox.setRight(minimumValueForLength(style()->marginRight(), visibleSize, renderView));
}
void RenderScrollbarPart::computeScrollbarHeight()
{
if (!m_scrollbar->owningRenderer())
return;
RenderView* renderView = view();
// FIXME: We are querying layout information but nothing guarantees that it's up-to-date, especially since we are called at style change.
// FIXME: Querying the style's border information doesn't work on table cells with collapsing borders.
int visibleSize = m_scrollbar->owningRenderer()->height() - m_scrollbar->owningRenderer()->style()->borderTopWidth() - m_scrollbar->owningRenderer()->style()->borderBottomWidth();
int h = calcScrollbarThicknessUsing(MainOrPreferredSize, style()->height(), visibleSize, renderView);
int minHeight = calcScrollbarThicknessUsing(MinSize, style()->minHeight(), visibleSize, renderView);
int maxHeight = style()->maxHeight().isUndefined() ? h : calcScrollbarThicknessUsing(MaxSize, style()->maxHeight(), visibleSize, renderView);
setHeight(max(minHeight, min(maxHeight, h)));
// Buttons and track pieces can all have margins along the axis of the scrollbar.
m_marginBox.setTop(minimumValueForLength(style()->marginTop(), visibleSize, renderView));
m_marginBox.setBottom(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);
clearPositionedState();
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)
{
// Make sure our dimensions match the rect.
setLocation(rect.location() - toSize(paintOffset));
setWidth(rect.width());
setHeight(rect.height());
if (graphicsContext->paintingDisabled())
return;
// Now do the paint.
PaintInfo paintInfo(graphicsContext, pixelSnappedIntRect(rect), PaintPhaseBlockBackground, PaintBehaviorNormal);
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();
}
}
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