void RenderView::addChild(RenderObject* newChild, RenderObject* beforeChild)
{
// Seamless iframes are considered part of an enclosing render flow thread from the parent document. This is necessary for them to look
// up regions in the parent document during layout.
if (newChild && !newChild->isRenderFlowThread()) {
RenderBox* seamlessBox = enclosingSeamlessRenderer(document());
if (seamlessBox && seamlessBox->flowThreadContainingBlock())
newChild->setFlowThreadState(seamlessBox->flowThreadState());
}
RenderBlock::addChild(newChild, beforeChild);
}
LayoutState::LayoutState(RenderBox& renderer, const LayoutSize& offset, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, ColumnInfo* columnInfo, bool containingBlockLogicalWidthChanged)
: m_containingBlockLogicalWidthChanged(containingBlockLogicalWidthChanged)
, m_columnInfo(columnInfo)
, m_next(renderer.view()->layoutState())
, m_renderer(renderer)
{
m_flowThread = renderer.isRenderFlowThread() ? toRenderFlowThread(&renderer) : m_next->flowThread();
renderer.view()->pushLayoutState(*this);
bool fixed = renderer.isOutOfFlowPositioned() && renderer.style()->position() == FixedPosition;
if (fixed) {
// FIXME: This doesn't work correctly with transforms.
FloatPoint fixedOffset = renderer.view()->localToAbsolute(FloatPoint(), IsFixed);
m_layoutOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()) + offset;
} else {
m_layoutOffset = m_next->m_layoutOffset + offset;
}
if (renderer.isOutOfFlowPositioned() && !fixed) {
if (RenderObject* container = renderer.container()) {
if (container->style()->hasInFlowPosition() && container->isRenderInline())
m_layoutOffset += toRenderInline(container)->offsetForInFlowPositionedInline(renderer);
}
}
// 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 || renderer.isRenderFlowThread()) {
m_pageLogicalHeight = pageLogicalHeight;
bool isFlipped = renderer.style()->isFlippedBlocksWritingMode();
m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? renderer.borderLeft() + renderer.paddingLeft() : renderer.borderRight() + renderer.paddingRight()),
m_layoutOffset.height() + (!isFlipped ? renderer.borderTop() + renderer.paddingTop() : renderer.borderBottom() + renderer.paddingBottom()));
m_pageLogicalHeightChanged = pageLogicalHeightChanged;
m_isPaginated = true;
} 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 (renderer.isUnsplittableForPagination()) {
m_pageLogicalHeight = 0;
m_isPaginated = false;
} else {
m_isPaginated = m_pageLogicalHeight || m_next->m_columnInfo || renderer.flowThreadContainingBlock();
}
}
if (!m_columnInfo)
m_columnInfo = m_next->m_columnInfo;
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}
bool RenderView::initializeLayoutState(LayoutState& state)
{
bool isSeamlessAncestorInFlowThread = false;
// FIXME: May be better to push a clip and avoid issuing offscreen repaints.
state.m_clipped = false;
// Check the writing mode of the seamless ancestor. It has to match our document's writing mode, or we won't inherit any
// pagination information.
RenderBox* seamlessAncestor = enclosingSeamlessRenderer(document());
LayoutState* seamlessLayoutState = seamlessAncestor ? seamlessAncestor->view().layoutState() : 0;
bool shouldInheritPagination = seamlessLayoutState && !m_pageLogicalHeight && seamlessAncestor->style()->writingMode() == style()->writingMode();
state.m_pageLogicalHeight = shouldInheritPagination ? seamlessLayoutState->m_pageLogicalHeight : m_pageLogicalHeight;
state.m_pageLogicalHeightChanged = shouldInheritPagination ? seamlessLayoutState->m_pageLogicalHeightChanged : m_pageLogicalHeightChanged;
state.m_isPaginated = state.m_pageLogicalHeight;
if (state.m_isPaginated && shouldInheritPagination) {
// Set up the correct pagination offset. We can use a negative offset in order to push the top of the RenderView into its correct place
// on a page. We can take the iframe's offset from the logical top of the first page and make the negative into the pagination offset within the child
// view.
bool isFlipped = seamlessAncestor->style()->isFlippedBlocksWritingMode();
LayoutSize layoutOffset = seamlessLayoutState->layoutOffset();
LayoutSize iFrameOffset(layoutOffset.width() + seamlessAncestor->x() + (!isFlipped ? seamlessAncestor->borderLeft() + seamlessAncestor->paddingLeft() :
seamlessAncestor->borderRight() + seamlessAncestor->paddingRight()),
layoutOffset.height() + seamlessAncestor->y() + (!isFlipped ? seamlessAncestor->borderTop() + seamlessAncestor->paddingTop() :
seamlessAncestor->borderBottom() + seamlessAncestor->paddingBottom()));
LayoutSize offsetDelta = seamlessLayoutState->m_pageOffset - iFrameOffset;
state.m_pageOffset = offsetDelta;
// Set the current render flow thread to point to our ancestor. This will allow the seamless document to locate the correct
// regions when doing a layout.
if (seamlessAncestor->flowThreadContainingBlock()) {
flowThreadController().setCurrentRenderFlowThread(seamlessAncestor->view().flowThreadController().currentRenderFlowThread());
isSeamlessAncestorInFlowThread = true;
}
}
// FIXME: We need to make line grids and exclusions work with seamless iframes as well here. Basically all layout state information needs
// to propagate here and not just pagination information.
return isSeamlessAncestorInFlowThread;
}