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/*
* Copyright (C) 2007 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 "LayoutState.h"
#include "ColumnInfo.h"
#include "RenderArena.h"
#include "RenderInline.h"
#include "RenderLayer.h"
#include "RenderView.h"
namespace WebCore {
LayoutState::LayoutState(LayoutState* prev, RenderBox* renderer, const IntSize& offset, int pageLogicalHeight, bool pageLogicalHeightChanged, ColumnInfo* columnInfo)
: m_columnInfo(columnInfo)
, m_next(prev)
#ifndef NDEBUG
, m_renderer(renderer)
#endif
{
ASSERT(m_next);
bool fixed = renderer->isPositioned() && renderer->style()->position() == FixedPosition;
if (fixed) {
// FIXME: This doesn't work correctly with transforms.
FloatPoint fixedOffset = renderer->view()->localToAbsolute(FloatPoint(), true);
m_paintOffset = IntSize(fixedOffset.x(), fixedOffset.y()) + offset;
} else
m_paintOffset = prev->m_paintOffset + offset;
if (renderer->isPositioned() && !fixed) {
if (RenderObject* container = renderer->container()) {
if (container->isRelPositioned() && container->isRenderInline())
m_paintOffset += toRenderInline(container)->relativePositionedInlineOffset(renderer);
}
}
m_layoutOffset = m_paintOffset;
if (renderer->isRelPositioned() && renderer->hasLayer())
m_paintOffset += renderer->layer()->relativePositionOffset();
m_clipped = !fixed && prev->m_clipped;
if (m_clipped)
m_clipRect = prev->m_clipRect;
if (renderer->hasOverflowClip()) {
RenderLayer* layer = renderer->layer();
IntRect clipRect(toPoint(m_paintOffset) + renderer->view()->layoutDelta(), layer->size());
if (m_clipped)
m_clipRect.intersect(clipRect);
else {
m_clipRect = clipRect;
m_clipped = true;
}
m_paintOffset -= layer->scrolledContentOffset();
}
// If we establish a new page height, then cache the offset to the top of the first page.
// We can compare this later on to figure out what part of the page we're actually on,
if (pageLogicalHeight || m_columnInfo) {
m_pageLogicalHeight = pageLogicalHeight;
m_pageOffset = IntSize(m_layoutOffset.width() + renderer->borderLeft() + renderer->paddingLeft(),
m_layoutOffset.height() + renderer->borderTop() + renderer->paddingTop());
m_pageLogicalHeightChanged = pageLogicalHeightChanged;
} else {
// If we don't establish a new page height, then propagate the old page height and offset down.
m_pageLogicalHeight = m_next->m_pageLogicalHeight;
m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
m_pageOffset = m_next->m_pageOffset;
// Disable pagination for objects we don't support. For now this includes overflow:scroll/auto and inline blocks.
if (renderer->isReplaced() || renderer->scrollsOverflow())
m_pageLogicalHeight = 0;
}
if (!m_columnInfo)
m_columnInfo = m_next->m_columnInfo;
m_layoutDelta = m_next->m_layoutDelta;
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}
LayoutState::LayoutState(RenderObject* root)
: m_clipped(false)
, m_pageLogicalHeight(0)
, m_pageLogicalHeightChanged(false)
, m_columnInfo(0)
, m_next(0)
#ifndef NDEBUG
, m_renderer(root)
#endif
{
RenderObject* container = root->container();
FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), false, true);
m_paintOffset = IntSize(absContentPoint.x(), absContentPoint.y());
if (container->hasOverflowClip()) {
RenderLayer* layer = toRenderBoxModelObject(container)->layer();
m_clipped = true;
m_clipRect = IntRect(toPoint(m_paintOffset), layer->size());
m_paintOffset -= layer->scrolledContentOffset();
}
}
#ifndef NDEBUG
static bool inLayoutStateDestroy;
#endif
void LayoutState::destroy(RenderArena* renderArena)
{
#ifndef NDEBUG
inLayoutStateDestroy = true;
#endif
delete this;
#ifndef NDEBUG
inLayoutStateDestroy = false;
#endif
renderArena->free(*(size_t*)this, this);
}
void* LayoutState::operator new(size_t sz, RenderArena* renderArena) throw()
{
return renderArena->allocate(sz);
}
void LayoutState::operator delete(void* ptr, size_t sz)
{
ASSERT(inLayoutStateDestroy);
*(size_t*)ptr = sz;
}
void LayoutState::clearPaginationInformation()
{
m_pageLogicalHeight = m_next->m_pageLogicalHeight;
m_pageOffset = m_next->m_pageOffset;
m_columnInfo = m_next->m_columnInfo;
}
int LayoutState::pageLogicalOffset(int childLogicalOffset) const
{
return m_layoutOffset.height() + childLogicalOffset - m_pageOffset.height();
}
void LayoutState::addForcedColumnBreak(int childLogicalOffset)
{
if (!m_columnInfo || m_columnInfo->columnHeight())
return;
m_columnInfo->addForcedBreak(pageLogicalOffset(childLogicalOffset));
}
} // namespace WebCore
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