LayoutState::LayoutState(LayoutBox& layoutObject, const LayoutSize& offset, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, bool containingBlockLogicalWidthChanged)
: m_containingBlockLogicalWidthChanged(containingBlockLogicalWidthChanged)
, m_next(layoutObject.view()->layoutState())
, m_layoutObject(layoutObject)
{
if (layoutObject.isLayoutFlowThread())
m_flowThread = toLayoutFlowThread(&layoutObject);
else if (!layoutObject.isOutOfFlowPositioned() && !layoutObject.isColumnSpanAll())
m_flowThread = m_next->flowThread();
else
m_flowThread = nullptr;
layoutObject.view()->pushLayoutState(*this);
bool fixed = layoutObject.isOutOfFlowPositioned() && layoutObject.style()->position() == FixedPosition;
if (fixed) {
// FIXME: This doesn't work correctly with transforms.
FloatPoint fixedOffset = layoutObject.view()->localToAbsolute(FloatPoint(), IsFixed);
m_layoutOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()) + offset;
} else {
m_layoutOffset = m_next->m_layoutOffset + offset;
}
if (layoutObject.isOutOfFlowPositioned() && !fixed) {
if (LayoutObject* container = layoutObject.container()) {
if (container->style()->hasInFlowPosition() && container->isLayoutInline())
m_layoutOffset += toLayoutInline(container)->offsetForInFlowPositionedInline(layoutObject);
}
}
// 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 || layoutObject.isLayoutFlowThread()) {
m_pageLogicalHeight = pageLogicalHeight;
bool isFlipped = layoutObject.style()->isFlippedBlocksWritingMode();
m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? layoutObject.borderLeft() + layoutObject.paddingLeft() : layoutObject.borderRight() + layoutObject.paddingRight()),
m_layoutOffset.height() + (!isFlipped ? layoutObject.borderTop() + layoutObject.paddingTop() : layoutObject.borderBottom() + layoutObject.paddingBottom()));
m_pageLogicalHeightChanged = pageLogicalHeightChanged;
m_isPaginated = true;
} else if (m_layoutObject.isSVG() && !m_layoutObject.isSVGRoot()) {
// Pagination inside SVG is not allowed.
m_flowThread = nullptr;
m_pageLogicalHeightChanged = false;
m_isPaginated = false;
} 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, inline blocks and
// writing mode roots.
if (layoutObject.isUnsplittableForPagination()) {
m_flowThread = nullptr;
m_pageLogicalHeight = 0;
m_isPaginated = false;
} else {
m_isPaginated = m_pageLogicalHeight || m_flowThread;
}
}
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}
LayoutState::LayoutState(LayoutBox& layoutObject,
bool containingBlockLogicalWidthChanged)
: m_containingBlockLogicalWidthChanged(containingBlockLogicalWidthChanged),
m_next(layoutObject.view()->layoutState()),
m_layoutObject(layoutObject) {
if (layoutObject.isLayoutFlowThread())
m_flowThread = toLayoutFlowThread(&layoutObject);
else
m_flowThread = m_next->flowThread();
m_paginationStateChanged = m_next->m_paginationStateChanged;
layoutObject.view()->pushLayoutState(*this);
m_heightOffsetForTableHeaders = m_next->heightOffsetForTableHeaders();
if (layoutObject.isLayoutFlowThread()) {
// Entering a new pagination context.
m_paginationOffset = LayoutSize();
m_isPaginated = true;
return;
}
// Disable pagination for objects we don't support. For now this includes
// overflow:scroll/auto, inline blocks and writing mode roots. Additionally,
// pagination inside SVG is not allowed.
if (layoutObject.getPaginationBreakability() == LayoutBox::ForbidBreaks ||
(m_layoutObject.isSVG() && !m_layoutObject.isSVGRoot())) {
m_flowThread = nullptr;
m_isPaginated = false;
return;
}
m_isPaginated = m_next->m_isPaginated;
if (!m_isPaginated)
return;
// Now adjust the pagination offset, so that we can easily figure out how far
// away we are from the start of the pagination context.
m_paginationOffset = m_next->m_paginationOffset;
bool fixed = layoutObject.isOutOfFlowPositioned() &&
layoutObject.style()->position() == FixedPosition;
if (fixed)
return;
m_paginationOffset =
m_next->m_paginationOffset + layoutObject.locationOffset();
if (!layoutObject.isOutOfFlowPositioned())
return;
if (LayoutObject* container = layoutObject.container()) {
if (container->style()->hasInFlowPosition() &&
container->isLayoutInline()) {
m_paginationOffset +=
toLayoutInline(container)->offsetForInFlowPositionedInline(
layoutObject);
}
}
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if
// present.
}
